Re: [Emc-users] A Bit OT, turning 4140

[andy pugh]

On 15 February 2012 22:55, Mark Cason  wrote:

>   I've never tried welding on a race to get it off.  I've never had a
> race that was stuck this badly.

It's a popular way to remove the bottom, outer, steering head race
from a motorcycle frame.

In the interests of rigidity they typically go up against a shoulder
to maximise wall-thickness, so there is nothing to bear on to drift
them out.

-- 
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Re: [Emc-users] Encoder wheel [Was: Need advice on 1/16" end mill]

[andy pugh]

On 15 February 2012 23:32, Mark Cason  wrote:

>   The CNRPPPT is a proprietary blend of metals that I'm still under
> NDA.   I can tell you that the C is Chrome, the N is Nickel, one of the
> P's is Platinum, and that's all I can tell you.

Oooh! That sounds like a fun game. I am going for Rhenium and Tantalum
for two of them.

(Actually, maybe not Tantalum, as the sputtering machine I ran for a
while used that as the sample holders because of its particularly low
souttering rate)

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Re: [Emc-users] A Bit OT, turning 4140

[Steve Blackmore]

On Wed, 15 Feb 2012 16:55:03 -0600, you wrote:


>   I've never tried welding on a race to get it off.  I've never had a 
>race that was stuck this badly.  I've got all kinds of pullers, many of 
>which I've made.  I also have a set of pullers that screw onto a 10lb 
>slide hammer that can persuade even the stubbornest of races to come out.

Sometimes when they are up against a larger shoulder it's impossible to
get a puller on. 

>   Actually, this is the second race this month, that was this badly 
>welded.  The planetary gears in my Dad's transfer case ate themselves 
>up, after it's bearing failed.   I didn't have to worry about removing 
>that race, because I never put the planetary back in...  There was very 
>little of it left, and the input shaft was too badly damaged, The 
>housing looked like a 1920's shootout, and It took the better part of a 
>day to TIG weld all of the holes up (die cast aluminum... Ugh!).  Then I 
>welded the input and output shafts together, forcing it to be 1-1 full 
>time.  It still has 4-hi, but it no longer has 4-lo.

Normal method for damaged casings is bore out and loctite a bearing
sleeve in. You can buy them off the shelf in common sizes, or make your
own. They are simply a thin wall sleeve, highly finished on the inside
to the correct bearing tolerance and rough turned on the outer to give
the loctite something to grip on.

Steve Blackmore
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Re: [Emc-users] Pengingat: Kurniadi mengundang kamu ke Twoo

[Lester Caine]

gene heskett wrote:
>> hallo, who let this one in the door?
>> >
> Beats me Jan.  I fed it to Spamassassin for training here.:)

Doesn't anybody speak English in Greater London now :)

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Re: [Emc-users] Encoder wheel [Was: Need advice on 1/16" end mill]

[charles green]

i've mostly dealt a proprietary formula called GFY, mostly.
 

--- On Thu, 2/16/12, andy pugh  wrote:


From: andy pugh 
Subject: Re: [Emc-users] Encoder wheel [Was: Need advice on 1/16" end mill]
To: farmerboy1...@yahoo.com, "Enhanced Machine Controller (EMC)" 

Date: Thursday, February 16, 2012, 12:01 AM


On 15 February 2012 23:32, Mark Cason  wrote:

>   The CNRPPPT is a proprietary blend of metals that I'm still under
> NDA.   I can tell you that the C is Chrome, the N is Nickel, one of the
> P's is Platinum, and that's all I can tell you.

Oooh! That sounds like a fun game. I am going for Rhenium and Tantalum
for two of them.

(Actually, maybe not Tantalum, as the sputtering machine I ran for a
while used that as the sample holders because of its particularly low
souttering rate)

-- 
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[Emc-users] More control board questions

[Erik Friesen]

How feasible is it to use the mesa 5i25 in a similar way to the universal
stepper controller?  IE.. Use hardware step generation + encoder feedback?

Another ignorant question, why is the industry so inclined to isolated IO?
vs single board designed systems where everything is layed out properly.
This just gets me, when trying to make a control system look neat, and you
have to use a hodge podge of different breakout boards, drivers, etc, with
a resultant rats nest of wires.
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Re: [Emc-users] More control board questions

[Dave Caroline]

Isolation is about protection of low voltage circuits that cannot
handle any spikes outside normal ranges
and the voltages inherent with electrical noise in a working system
which could easily be up to 1000v or more.
It also removes the "ground loop" that add/subtracts from your signal.

Dave Caroline

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Re: [Emc-users] More control board questions

[Andy Pugh]

On 16 Feb 2012, at 14:29, Erik Friesen  wrote:

> How feasible is it to use the mesa 5i25 in a similar way to the universal
> stepper controller?  IE.. Use hardware step generation + encoder feedback?

Just a bare 5i25, or using daughter cards? 
You ought to be able to do it with a 7i76 and a 7i77 (that's the stepper board 
_and_ the servo board at the same time.  Otherwise you would need a special 
firmware I think. 25 pins might be a bit few, though there is a second 25 pin 
header too. The dedicated daughter boards use serial-connected hardware for the 
extra IO pins with only the stepgens, encoders and pwms wired direct back to 
the 5i25. 
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Re: [Emc-users] More control board questions

[Przemek Klosowski]

On Thu, Feb 16, 2012 at 8:29 AM, Erik Friesen  wrote:

> Another ignorant question, why is the industry so inclined to isolated IO?
> vs single board designed systems where everything is layed out properly.
> This just gets me, when trying to make a control system look neat, and you
> have to use a hodge podge of different breakout boards, drivers, etc, with
> a resultant rats nest of wires.

The interface boards are essentially working as fancy fuses, because
industrial environments are messy and confusing, with noise,
interference, crosstalk, voltage surges and wiring mishaps due to
things like technician error or 'conveyor chewed up the main cable
harness'. It's easier to replace an interface board than the entire
single board integrated controller.

In the old days, the PC serial ports always had a socketed 1488/1489
i/o buffer chips on the motherboard; instead of blowing up the entire
motherboard, serial port mishaps could be fixed by replacing the chip.
Curiously, those chips were designed by Jim Thompson who's around in
the sci.electronics.design newsgroup. Since then, they made protection
circuits better and/or people stopped doing egregious things with
serial ports---but still there's a standing recommendation to use
separate PCI cards for serial and parallel ports interfacing to
non-computer equipment, because they can be swapped out, unlike the
motherboard built-ins.

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Re: [Emc-users] Pengingat: Kurniadi mengundang kamu ke Twoo

[Przemek Klosowski]

On Wed, Feb 15, 2012 at 11:38 PM, Kurniadi via Twoo
 wrote:
> Saya menemukan cara asyik dan eksklusif untuk bertemu kenalan baru online: 
> Twoo.com.

It's Indonesian---someone's gmail account got hacked/exploited. How do
I know? Google Translate's automatic language recognition is superb.

EMC relevance: Google Translate is great for foreign languages; I was
able to point it at web pages with Japanese and Chinese datasheets and
technical specs, and to my pleasant surprise the result was
comprehensible.

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Re: [Emc-users] More control board questions

[Peter C. Wallace]

On Thu, 16 Feb 2012, Erik Friesen wrote:

> Date: Thu, 16 Feb 2012 08:29:52 -0500
> From: Erik Friesen 
> Reply-To: "Enhanced Machine Controller (EMC)"
> 
> To: "Enhanced Machine Controller (EMC)" 
> Subject: [Emc-users] More control board questions
> 
> How feasible is it to use the mesa 5i25 in a similar way to the universal
> stepper controller?  IE.. Use hardware step generation + encoder feedback?

Its easy, there are number of our customers doing this with step motors or 
step/dir driven servos. You just use a configuration with stepgens and encoder 
counters. Inside HAL the stepgens are set into velocity mode and PID loops are 
setup to so the PID output sets the step rate of the step motors or step/dir 
servos, basically emulating a velocity mode servo system.


(encoder_count, commanded_pos) --> PID comp --> stepgen_velocity_command
--> motor drive --> encoder_count


>
> Another ignorant question, why is the industry so inclined to isolated IO?
> vs single board designed systems where everything is layed out properly.
> This just gets me, when trying to make a control system look neat, and you
> have to use a hodge podge of different breakout boards, drivers, etc, with
> a resultant rats nest of wires.
> --
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> Cloud computing makes use of virtualization - but cloud computing
> also focuses on allowing computing to be delivered as a service.
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>

Peter Wallace
Mesa Electronics

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Re: [Emc-users] More control board questions

[James Louis]

Are there any example wiring diagrams available for this "easy" closed loop 
stepper configuration?
It sounds interesting.
Jim

- Original Message -
From: Peter C. Wallace 
To: Enhanced Machine Controller (EMC) 
Sent: Thu Feb 16 08:42:33 2012
Subject: Re: [Emc-users] More control board questions

On Thu, 16 Feb 2012, Erik Friesen wrote:

> Date: Thu, 16 Feb 2012 08:29:52 -0500
> From: Erik Friesen 
> Reply-To: "Enhanced Machine Controller (EMC)"
> 
> To: "Enhanced Machine Controller (EMC)" 
> Subject: [Emc-users] More control board questions
>
> How feasible is it to use the mesa 5i25 in a similar way to the universal
> stepper controller?  IE.. Use hardware step generation + encoder feedback?

Its easy, there are number of our customers doing this with step motors or
step/dir driven servos. You just use a configuration with stepgens and encoder
counters. Inside HAL the stepgens are set into velocity mode and PID loops are
setup to so the PID output sets the step rate of the step motors or step/dir
servos, basically emulating a velocity mode servo system.


(encoder_count, commanded_pos) --> PID comp --> stepgen_velocity_command
--> motor drive --> encoder_count


>
> Another ignorant question, why is the industry so inclined to isolated IO?
> vs single board designed systems where everything is layed out properly.
> This just gets me, when trying to make a control system look neat, and you
> have to use a hodge podge of different breakout boards, drivers, etc, with
> a resultant rats nest of wires.
> --
> Virtualization & Cloud Management Using Capacity Planning
> Cloud computing makes use of virtualization - but cloud computing
> also focuses on allowing computing to be delivered as a service.
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> https://lists.sourceforge.net/lists/listinfo/emc-users
>

Peter Wallace
Mesa Electronics

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Re: [Emc-users] More control board questions

[Peter C. Wallace]

On Thu, 16 Feb 2012, James Louis wrote:

> Date: Thu, 16 Feb 2012 09:02:26 -0600
> From: James Louis 
> Reply-To: "Enhanced Machine Controller (EMC)"
> 
> To: "emc-users@lists.sourceforge.net" 
> Subject: Re: [Emc-users] More control board questions
> 
> Are there any example wiring diagrams available for this "easy" closed loop 
> stepper configuration?
> It sounds interesting.
> Jim

http://wiki.linuxcnc.org/cgi-bin/wiki.pl?GantryPlasmaMachine

includes HAL files I believe


>
> - Original Message -
> From: Peter C. Wallace 
> To: Enhanced Machine Controller (EMC) 
> Sent: Thu Feb 16 08:42:33 2012
> Subject: Re: [Emc-users] More control board questions
>
> On Thu, 16 Feb 2012, Erik Friesen wrote:
>
>> Date: Thu, 16 Feb 2012 08:29:52 -0500
>> From: Erik Friesen 
>> Reply-To: "Enhanced Machine Controller (EMC)"
>> 
>> To: "Enhanced Machine Controller (EMC)" 
>> Subject: [Emc-users] More control board questions
>>
>> How feasible is it to use the mesa 5i25 in a similar way to the universal
>> stepper controller?  IE.. Use hardware step generation + encoder feedback?
>
> Its easy, there are number of our customers doing this with step motors or
> step/dir driven servos. You just use a configuration with stepgens and encoder
> counters. Inside HAL the stepgens are set into velocity mode and PID loops are
> setup to so the PID output sets the step rate of the step motors or step/dir
> servos, basically emulating a velocity mode servo system.
>
>
> (encoder_count, commanded_pos) --> PID comp --> stepgen_velocity_command
> --> motor drive --> encoder_count
>
>
>>
>> Another ignorant question, why is the industry so inclined to isolated IO?
>> vs single board designed systems where everything is layed out properly.
>> This just gets me, when trying to make a control system look neat, and you
>> have to use a hodge podge of different breakout boards, drivers, etc, with
>> a resultant rats nest of wires.
>> --
>> Virtualization & Cloud Management Using Capacity Planning
>> Cloud computing makes use of virtualization - but cloud computing
>> also focuses on allowing computing to be delivered as a service.
>> http://www.accelacomm.com/jaw/sfnl/114/51521223/
>> ___
>> Emc-users mailing list
>> Emc-users@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/emc-users
>>
>
> Peter Wallace
> Mesa Electronics
>
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> (")_(") signature to help him gain world domination.
>
>
> --
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>
> This communication is for the use of the intended recipient only. It may 
> contain information that is privileged and confidential. If you are not the 
> intended recipient of this communication, the disclosure, copying, 
> distribution or use hereof is prohibited. If you have received this 
> communication in error, please advise me by return e-mail or by telephone and 
> then delete it immediately.
>

Peter Wallace
Mesa Electronics

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[Emc-users] Cutsim (was: Re: Feature request)

[Anders Wallin]

> I don't think that belongs in linuxcnc.  It sounds like you would like the 
> "cut simulation" work that Anders Wallin et al are working on.  Check this 
> out: http://www.anderswallin.net/2010/08/octree-animation/
>
> It'd be cool to have a tool like that in another Axis tab...

Last time I tried to work on cutting-simulation I tried to do it all
in one: OpenGL, threading, double-buffering, QT-gui, rs274-interface
etc.

Maybe the way forward is to start minimal instead. I trimmed down
libcutsim to a bare minimum over here:
https://github.com/aewallin/libcutsim

This should be mostly standard c++ and only require cmake +
boost-libraries to compile.

I'd be very interested in working with someone who knows enough about
AXIS to get this started. What I think we need:
- A tool definition (this can be hard-coded for now, but set by g-code
comments eventually)
- A stock definition (hard-coded for now, set by g-code comment eventually)
- For each line of g-code (or canon-move) a call into cutsim asking to
execute that move. This is userspace stuff so no real-time demands
please. The trivial approach to subtracting a move from the stock is:
(a) subtract a stationary cutter at (x,y,z,a,b,c) from the stock.
(b) move cutter along programmed move by a small amount (dx,dy,dz,da,db,dc)
(c) while move not done go to (a)
- we can do one or many iterations of this loop between OpenGL
updates. Or we can do one or many canon-lines between OpenGL updates.
- When we call Cutsim::updateGL() it will respond by updating two
arrays: a vertexArray and an indexArray. The vertex array holds
vertices which are essentially 6-tuples of coordinate and color
(x,y,z,r,g,b). The indexArray holds indexes into the vertexArray.
Depending on the algorithm these are interpreted as lines, triangles
or quads for drawing. For example the first triangle would have
vertices:
vertexArray[ indexArray[0] ], vertexArray[ indexArray[1] ],
vertexArray[ indexArray[2] ]
and so on.
I got quite lost with immediate-mode, vertex-array,
vertex-buffer-object, etc. drawing last time I tried, so it would be
much better if someone who has experience with OpenGL would do the
rendering part. The vertexArray/indexArray can be accessed from C++ or
python. At first I don't care if the view "freezes" while we run the
program, but in the future it would be great to allow rotate/pan/zoom
while running (I am not sure what combination of drawing-mode,
threading, or double-buffering is needed for this).

I'd really like to see this happen, and I know there's a much greater
chance of success if we work together and this becomes a permanent
part of LinuxCNC - rather than I or someone else going at it alone.
Please respond with ideas/comments/patches!

Anders

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Re: [Emc-users] More control board questions

[James Louis]

I could not find a wiring diagram of the devices connected to the Mesa 7I43-U-4 
card at GantryPlasmaMachine.  Config files yes, schematics no.
That is otherwise a GREAT wiki page!  Thanks!
Jim

- Original Message -
From: Peter C. Wallace 
To: Enhanced Machine Controller (EMC) 
Sent: Thu Feb 16 09:26:02 2012
Subject: Re: [Emc-users] More control board questions

On Thu, 16 Feb 2012, James Louis wrote:

> Date: Thu, 16 Feb 2012 09:02:26 -0600
> From: James Louis 
> Reply-To: "Enhanced Machine Controller (EMC)"
> 
> To: "emc-users@lists.sourceforge.net" 
> Subject: Re: [Emc-users] More control board questions
>
> Are there any example wiring diagrams available for this "easy" closed loop 
> stepper configuration?
> It sounds interesting.
> Jim

http://wiki.linuxcnc.org/cgi-bin/wiki.pl?GantryPlasmaMachine

includes HAL files I believe


>
> - Original Message -
> From: Peter C. Wallace 
> To: Enhanced Machine Controller (EMC) 
> Sent: Thu Feb 16 08:42:33 2012
> Subject: Re: [Emc-users] More control board questions
>
> On Thu, 16 Feb 2012, Erik Friesen wrote:
>
>> Date: Thu, 16 Feb 2012 08:29:52 -0500
>> From: Erik Friesen 
>> Reply-To: "Enhanced Machine Controller (EMC)"
>> 
>> To: "Enhanced Machine Controller (EMC)" 
>> Subject: [Emc-users] More control board questions
>>
>> How feasible is it to use the mesa 5i25 in a similar way to the universal
>> stepper controller?  IE.. Use hardware step generation + encoder feedback?
>
> Its easy, there are number of our customers doing this with step motors or
> step/dir driven servos. You just use a configuration with stepgens and encoder
> counters. Inside HAL the stepgens are set into velocity mode and PID loops are
> setup to so the PID output sets the step rate of the step motors or step/dir
> servos, basically emulating a velocity mode servo system.
>
>
> (encoder_count, commanded_pos) --> PID comp --> stepgen_velocity_command
> --> motor drive --> encoder_count
>
>
>>
>> Another ignorant question, why is the industry so inclined to isolated IO?
>> vs single board designed systems where everything is layed out properly.
>> This just gets me, when trying to make a control system look neat, and you
>> have to use a hodge podge of different breakout boards, drivers, etc, with
>> a resultant rats nest of wires.
>> --
>> Virtualization & Cloud Management Using Capacity Planning
>> Cloud computing makes use of virtualization - but cloud computing
>> also focuses on allowing computing to be delivered as a service.
>> http://www.accelacomm.com/jaw/sfnl/114/51521223/
>> ___
>> Emc-users mailing list
>> Emc-users@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/emc-users
>>
>
> Peter Wallace
> Mesa Electronics
>
> (\__/)
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Re: [Emc-users] Encoder wheel [Was: Need advice on 1/16" end mill]

[dave]

On Thu, 16 Feb 2012 08:01:13 +
andy pugh  wrote:

> On 15 February 2012 23:32, Mark Cason  wrote:
> 
> >   The CNRPPPT is a proprietary blend of metals that I'm still under
> > NDA.   I can tell you that the C is Chrome, the N is Nickel, one of
> > the P's is Platinum, and that's all I can tell you.
> 
> Oooh! That sounds like a fun game. I am going for Rhenium and Tantalum
> for two of them.
> 
> (Actually, maybe not Tantalum, as the sputtering machine I ran for a
> while used that as the sample holders because of its particularly low
> souttering rate)
I'd go Palladium and Tungsten. The P's are pretty limited but knowing
current materials science I'd go for a rare earth. 

Dave
> 


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Re: [Emc-users] Cutsim (was: Re: Feature request)

[Sebastian Kuzminsky]

I have only a little experience as a user of cut simulation, but the times I've 
used it, it's been integrated with the CAM rather than with the machine 
control.  It's when you're designing the cuts that cutsim is most useful, IMO.  
I wonder if Dan Falck's FreeCAD+OpenCamLib work would be a useful place to add 
it?

 
On Feb 16, 2012, at 08:27 , Anders Wallin wrote:

>> I don't think that belongs in linuxcnc.  It sounds like you would like the 
>> "cut simulation" work that Anders Wallin et al are working on.  Check this 
>> out: http://www.anderswallin.net/2010/08/octree-animation/
>> 
>> It'd be cool to have a tool like that in another Axis tab...
> 
> Last time I tried to work on cutting-simulation I tried to do it all
> in one: OpenGL, threading, double-buffering, QT-gui, rs274-interface
> etc.
> 
> Maybe the way forward is to start minimal instead. I trimmed down
> libcutsim to a bare minimum over here:
> https://github.com/aewallin/libcutsim
> 
> This should be mostly standard c++ and only require cmake +
> boost-libraries to compile.
> 
> I'd be very interested in working with someone who knows enough about
> AXIS to get this started. What I think we need:
> - A tool definition (this can be hard-coded for now, but set by g-code
> comments eventually)
> - A stock definition (hard-coded for now, set by g-code comment eventually)
> - For each line of g-code (or canon-move) a call into cutsim asking to
> execute that move. This is userspace stuff so no real-time demands
> please. The trivial approach to subtracting a move from the stock is:
> (a) subtract a stationary cutter at (x,y,z,a,b,c) from the stock.
> (b) move cutter along programmed move by a small amount (dx,dy,dz,da,db,dc)
> (c) while move not done go to (a)
> - we can do one or many iterations of this loop between OpenGL
> updates. Or we can do one or many canon-lines between OpenGL updates.
> - When we call Cutsim::updateGL() it will respond by updating two
> arrays: a vertexArray and an indexArray. The vertex array holds
> vertices which are essentially 6-tuples of coordinate and color
> (x,y,z,r,g,b). The indexArray holds indexes into the vertexArray.
> Depending on the algorithm these are interpreted as lines, triangles
> or quads for drawing. For example the first triangle would have
> vertices:
> vertexArray[ indexArray[0] ], vertexArray[ indexArray[1] ],
> vertexArray[ indexArray[2] ]
> and so on.
> I got quite lost with immediate-mode, vertex-array,
> vertex-buffer-object, etc. drawing last time I tried, so it would be
> much better if someone who has experience with OpenGL would do the
> rendering part. The vertexArray/indexArray can be accessed from C++ or
> python. At first I don't care if the view "freezes" while we run the
> program, but in the future it would be great to allow rotate/pan/zoom
> while running (I am not sure what combination of drawing-mode,
> threading, or double-buffering is needed for this).
> 
> I'd really like to see this happen, and I know there's a much greater
> chance of success if we work together and this becomes a permanent
> part of LinuxCNC - rather than I or someone else going at it alone.
> Please respond with ideas/comments/patches!
> 
> Anders
> 
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Re: [Emc-users] Pengingat: Kurniadi mengundang kamu ke Twoo

[Kirk Wallace]

On Thu, 2012-02-16 at 02:29 -0500, gene heskett wrote:
> On Thursday, February 16, 2012 02:27:45 AM Jan de Kruyf did opine:
> 
> > hallo, who let this one in the door?
> > 
> > j
> > 
> Beats me Jan.  I fed it to Spamassassin for training here. :)
> 
> Cheers, Gene

I seem to recall that the last message like this was legit?
-- 
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
California, USA


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Re: [Emc-users] More control board questions

[Jon Elson]

James Louis wrote:
> Are there any example wiring diagrams available for this "easy" closed loop 
> stepper configuration?
Take a standard Universal Stepper Controller, and get it working with drives
and motors of your choice.  Add encoders, and flip the DIP switch on the 
board
to select the encoder as the position feedback source.  One DIP switch for
each axis, so you can use it on only selected axes.  Probably the only
change to EMC would be to make sure the INPUT_SCALE matches the
encoder counts * leadscrew pitch.

Jon

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Re: [Emc-users] Encoder wheel [Was: Need advice on 1/16" end mill]

[Mark Cason]

On 02/16/2012 01:52 AM, andy pugh wrote:
> On 15 February 2012 21:29, gene heskett  wrote:
>
>>> Gene - the encoder wheel I use is 3mm Tufnol sheet, painted black.
>> The plastic, except for temporary fitting wouldn't do for permanent as it
>> will be trapped between the spindle preload nut, and it's locking nut in
>> normal operation.  That is driven tight with a drift punch in the nut
>> slots.  The plastic will 'cold flow', loosening the nut, and that won't be
>> good for things.
> Tufnol won't cold-flow, it's phenolic paper (or phenolic fabric).
> Long-term stability is one of the properties they sell it on.
> http://www.tufnol.com/tufnol/default.asp?id=92
> "creep is minimal"

   Another thing that can be used, is "real" formica.  I used to get the 
small sample rectangles that were given out at the building supply 
stores, sand the finish off of them, glue up a stack with some good 
contact adhesive, and use them for electrical insulators.  Get creative 
with the stacking, and you can make pretty much any diameter, and 
thickness you need.  you can get these thing by the handful at Lowes, 
and HD.

-- 
-Mark

Ne M'oubliez   ---Family Motto
Hope for the best, plan for the worst   ---Personal Motto


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Re: [Emc-users] Cutsim (was: Re: Feature request)

[gene heskett]

On Thursday, February 16, 2012 11:53:23 AM Sebastian Kuzminsky did opine:

> I have only a little experience as a user of cut simulation, but the
> times I've used it, it's been integrated with the CAM rather than with
> the machine control.  It's when you're designing the cuts that cutsim
> is most useful, IMO.  I wonder if Dan Falck's FreeCAD+OpenCamLib work
> would be a useful place to add it?
> 
While I would have no objections to that, it would only become 'useful' for 
me if freecad could import the gcode that already exists, in a LinuxCNC 
compatible format.  I'm on the buildbot ppa, so freecad gets updated quite 
frequently, but it had not grown that ability when I last ran it yesterday.

Because LinuxCNC is the 'consumer' of gcode, often just the output of 
someones editor of choice, it makes more common sense to me to have either 
a standalone viewer, such as openscam, or a linked in ability that might 
even use the axis backplot display window if it was enabled.  That isn't an 
important function though, just the ability to get at least a 2D preview 
that would give us a preview.

openscam, as of the build I did yesterday, is not working, no clue why 
other than the messages I posted from the cli yesterday.  I suspect it 
needs a tool table file, which of course isn't going to be available when 
it is "run in place", the build having zero docs, and zero installation in 
its Makefile.

In this openscam, I see , in the .cpp file, a copyright joseph AT 
cauldrondevelopment DOT com, whom I have not emailed but will next as it 
looks as if the propaganda I can google says it should do what is needed.

That name does not ring any bells for me, but perhaps if he knows there is 
some interest, he might join in the discussion here.

> On Feb 16, 2012, at 08:27 , Anders Wallin wrote:
> >> I don't think that belongs in linuxcnc.  It sounds like you would
> >> like the "cut simulation" work that Anders Wallin et al are working
> >> on.  Check this out:
> >> http://www.anderswallin.net/2010/08/octree-animation/
> >> 
> >> It'd be cool to have a tool like that in another Axis tab...
> > 
> > Last time I tried to work on cutting-simulation I tried to do it all
> > in one: OpenGL, threading, double-buffering, QT-gui, rs274-interface
> > etc.
> > 
> > Maybe the way forward is to start minimal instead. I trimmed down
> > libcutsim to a bare minimum over here:
> > https://github.com/aewallin/libcutsim
> > 
> > This should be mostly standard c++ and only require cmake +
> > boost-libraries to compile.
> > 
> > I'd be very interested in working with someone who knows enough about
> > AXIS to get this started. What I think we need:
> > - A tool definition (this can be hard-coded for now, but set by g-code
> > comments eventually)
> > - A stock definition (hard-coded for now, set by g-code comment
> > eventually) - For each line of g-code (or canon-move) a call into
> > cutsim asking to execute that move. This is userspace stuff so no
> > real-time demands please. The trivial approach to subtracting a move
> > from the stock is: (a) subtract a stationary cutter at (x,y,z,a,b,c)
> > from the stock. (b) move cutter along programmed move by a small
> > amount (dx,dy,dz,da,db,dc) (c) while move not done go to (a)
> > - we can do one or many iterations of this loop between OpenGL
> > updates. Or we can do one or many canon-lines between OpenGL updates.
> > - When we call Cutsim::updateGL() it will respond by updating two
> > arrays: a vertexArray and an indexArray. The vertex array holds
> > vertices which are essentially 6-tuples of coordinate and color
> > (x,y,z,r,g,b). The indexArray holds indexes into the vertexArray.
> > Depending on the algorithm these are interpreted as lines, triangles
> > or quads for drawing. For example the first triangle would have
> > vertices:
> > vertexArray[ indexArray[0] ], vertexArray[ indexArray[1] ],
> > vertexArray[ indexArray[2] ]
> > and so on.
> > I got quite lost with immediate-mode, vertex-array,
> > vertex-buffer-object, etc. drawing last time I tried, so it would be
> > much better if someone who has experience with OpenGL would do the
> > rendering part. The vertexArray/indexArray can be accessed from C++ or
> > python. At first I don't care if the view "freezes" while we run the
> > program, but in the future it would be great to allow rotate/pan/zoom
> > while running (I am not sure what combination of drawing-mode,
> > threading, or double-buffering is needed for this).
> > 
> > I'd really like to see this happen, and I know there's a much greater
> > chance of success if we work together and this becomes a permanent
> > part of LinuxCNC - rather than I or someone else going at it alone.
> > Please respond with ideas/comments/patches!
> > 
> > Anders

I am personally in favor of it Anders, but the best claim I can make about 
C is that I knew, 20 years ago (and have forgotten much of it) just enough 
C to be dangerous.  And absolutely zip about C++ :(

Cheers, Gene
-- 
"The

Re: [Emc-users] Cutsim (was: Re: Feature request)

[Dave Caroline]

On Thu, Feb 16, 2012 at 4:49 PM, Sebastian Kuzminsky  wrote:
> I have only a little experience as a user of cut simulation, but the times 
> I've used it, it's been integrated with the CAM rather than with the machine 
> control.  It's when you're designing the cuts that cutsim is most useful, 
> IMO.  I wonder if Dan Falck's FreeCAD+OpenCamLib work would be a useful place 
> to add it?
>
>
For the hand coders "in the cam package" is the wrong place
and also none of the usable open graphical cam packages do more than 3
axis milling that I know of.

I support the need to include cutsim in the machine display.
perhaps the work for vismach should be merged with cutsim
as our machines are all different and the stock we are cutting too
tool shapes are a can of worms for some, hot wire, form cutters etc

Dave Caroline

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Re: [Emc-users] More control board questions

[Erik Friesen]

What I have in mind is my own "daughtercard".  Encoders would be fed
through to the 5i25.  I would use a mcp3208 in spi mode to give me 8 analog
inputs, assuming the 5i25 can do it.

I have been looking at the gecko drives, they are 10x microstepping, which
seems overkill.  They do have some decent features though.  However, my
computer can only do 15khz software step generation, which doesn't do well
with 10x microstepping and speed.

On Thu, Feb 16, 2012 at 8:55 AM, Andy Pugh  wrote:

>
>
> On 16 Feb 2012, at 14:29, Erik Friesen  wrote:
>
> > How feasible is it to use the mesa 5i25 in a similar way to the universal
> > stepper controller?  IE.. Use hardware step generation + encoder
> feedback?
>
> Just a bare 5i25, or using daughter cards?
> You ought to be able to do it with a 7i76 and a 7i77 (that's the stepper
> board _and_ the servo board at the same time.  Otherwise you would need a
> special firmware I think. 25 pins might be a bit few, though there is a
> second 25 pin header too. The dedicated daughter boards use
> serial-connected hardware for the extra IO pins with only the stepgens,
> encoders and pwms wired direct back to the 5i25.
>
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Re: [Emc-users] More control board questions

[Erik Friesen]

How are these customers dealing with a stalled stepper, or is there any
limits built in?

I know you should never have a stalled stepper, but you still need to plan
for it anyway.

On Thu, Feb 16, 2012 at 9:42 AM, Peter C. Wallace  wrote:

> On Thu, 16 Feb 2012, Erik Friesen wrote:
>
> > Date: Thu, 16 Feb 2012 08:29:52 -0500
> > From: Erik Friesen 
> > Reply-To: "Enhanced Machine Controller (EMC)"
> > 
> > To: "Enhanced Machine Controller (EMC)"  >
> > Subject: [Emc-users] More control board questions
> >
> > How feasible is it to use the mesa 5i25 in a similar way to the universal
> > stepper controller?  IE.. Use hardware step generation + encoder
> feedback?
>
> Its easy, there are number of our customers doing this with step motors or
> step/dir driven servos. You just use a configuration with stepgens and
> encoder
> counters. Inside HAL the stepgens are set into velocity mode and PID loops
> are
> setup to so the PID output sets the step rate of the step motors or
> step/dir
> servos, basically emulating a velocity mode servo system.
>
>
> (encoder_count, commanded_pos) --> PID comp --> stepgen_velocity_command
> --> motor drive --> encoder_count
>
>
> >
> > Another ignorant question, why is the industry so inclined to isolated
> IO?
> > vs single board designed systems where everything is layed out properly.
> > This just gets me, when trying to make a control system look neat, and
> you
> > have to use a hodge podge of different breakout boards, drivers, etc,
> with
> > a resultant rats nest of wires.
> >
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>
> Peter Wallace
> Mesa Electronics
>
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Re: [Emc-users] Cutsim (was: Re: Feature request)

[Anders Wallin]

> I have only a little experience as a user of cut simulation, but the times 
> I've used it, it's been integrated with the CAM rather than with the machine 
> control.  It's when you're designing the cuts that cutsim is most useful, 
> IMO.  I wonder if Dan Falck's FreeCAD+OpenCamLib work would be a useful place 
> to add it?
>

Well, one thing is for sure: I will not write a new g-code parser/interpreter.
There is about three parts to this I think:
- openGL view (AXIS is quite close to raw OpenGL I think, FreeCAD has
one based on OpenCascade and/or Qt)
- g-code or other input interpreter (LinuxCNC obviously has librs274,
FreeCAD could work on some internal CAM-format maybe, but that would
need inventing+work)
- libcutsim (stock-model, cutting ops, surface-extraction/update)
- ui (AXIS has g-code preview, play/pause/stop buttons, etc).

>From having toyed around with developing a few CAM-algorithms I can
say that you can be led into a false sense of security by only
plotting static geometry on the screen. Forcing oneself to produce
G-code and viewing the motion often reveals small or bigger bugs. So
from a CAM-development point of view I think having the simulator work
with G-code input is good.

So this needs not necessarily be within the framework of AXIS. It may
or may not be faster/easier to write a new GUI from scratch that has
g-code preview, play/pause/stop, and an OpenGL context with good
rotate/pan/zoom etc. for drawing. I've already tried and failed at
this second approach, so it's unlikely I will try again (at least
until the scars heal, or I forget...:) )
Graphics performance is an obvious concern. With my toy-tests are
easily get up to 100-500k triangles, which starts to be slow to draw
using naive methods. If it turns out early that AXISs python-based
OpenGL will not perform then an OpenGL view in c++ might be required.

AW

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Re: [Emc-users] More control board questions

[gene heskett]

On Thursday, February 16, 2012 01:40:53 PM Erik Friesen did opine:

> What I have in mind is my own "daughtercard".  Encoders would be fed
> through to the 5i25.  I would use a mcp3208 in spi mode to give me 8
> analog inputs, assuming the 5i25 can do it.
> 
> I have been looking at the gecko drives, they are 10x microstepping,
> which seems overkill.  They do have some decent features though. 
> However, my computer can only do 15khz software step generation, which
> doesn't do well with 10x microstepping and speed.
> 
The main advantage to the microstepping is two fold, and both come from the 
same effect, that of smoothing the steps and getting a lower excitation 
amplitude of the resonances in the motors mechanical vs magnetic 
characteristics. Remember, you are dealing with a very strong magnet whose 
instant position is determined by 2 very strong magnetic fields, so the 
armature is effectively held in position by 2 springs of varying strengths 
according to the currents programmed for that particular position in the 
full step envelope

You will need less in the way of dampers to control this resonance, and at 
the same time the motors turn noticeably quieter.  At one point 3 or 4 
years back I got curious and set the xylotex's for 1/2 step, and you could 
hear the motors howling in the neighbors back yard, so that experiment was 
terminated the same day.

When I bought the MM542 drivers I'm using now I knew the /64 microstepping 
they could do was not feasible, not on an atom powered D525MW board, but 
that /16 might be usable & if that was pushing the computer I could always 
go back to /8 which I was using with the xylotex drivers.  The noise 
reduction was noticeable, there are now some speeds less than 1 rps, where 
the motors are almost dead silent compared to the other noises from the 
fans and such, and its a bit odd to see them doing half a rev per second 
silently.

I have not checked to see how far I can push the rapids as I had a previous 
config setup that ran much faster, but that was also at the expense of long 
accel times, but there was no real gain in job times so I have not explored 
the rapids ranges above nominally 16 ipm on my toy yet, better things to do 
& too cold in the shop to spend days fine tuning that sort of thing.

> On Thu, Feb 16, 2012 at 8:55 AM, Andy Pugh  wrote:
> > On 16 Feb 2012, at 14:29, Erik Friesen  wrote:
> > > How feasible is it to use the mesa 5i25 in a similar way to the
> > > universal stepper controller?  IE.. Use hardware step generation +
> > > encoder
> > 
> > feedback?
> > 
> > Just a bare 5i25, or using daughter cards?
> > You ought to be able to do it with a 7i76 and a 7i77 (that's the
> > stepper board _and_ the servo board at the same time.  Otherwise you
> > would need a special firmware I think. 25 pins might be a bit few,
> > though there is a second 25 pin header too. The dedicated daughter
> > boards use
> > serial-connected hardware for the extra IO pins with only the
> > stepgens, encoders and pwms wired direct back to the 5i25.
> > 
> > --
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> 
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Cheers, Gene
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
My web page: 
The finest eloquence is that which gets things done.

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Re: [Emc-users] More control board questions

[Peter C. Wallace]

On Thu, 16 Feb 2012, Erik Friesen wrote:

> Date: Thu, 16 Feb 2012 13:28:59 -0500
> From: Erik Friesen 
> Reply-To: "Enhanced Machine Controller (EMC)"
> 
> To: "Enhanced Machine Controller (EMC)" 
> Subject: Re: [Emc-users] More control board questions
> 
> How are these customers dealing with a stalled stepper, or is there any
> limits built in?

When you use encoder feedback, stalled step motor detection is automatic
(it causes a following error)


Peter Wallace
Mesa Electronics

(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination.


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[Emc-users] spam

[Jan de Kruyf]

Hallo Kurniadi,

Sorry my friend but you are creating spam again on the emc mailinglist.
Hope you noticed it.

Regards,

Jan de Kruyf.
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[Emc-users] OT-bandsaw

[dave]

Hi all, 

I have a cheapie horizontal bandsaw that has performed decently well
for 10 years or so and just recently started sheddinga the blade after a
few turns. 

As far as I can tell the blade works its way off the non-driven wheel. 
I suspect the guides (ball bearings) are at fault but will entertain
other reasonable ideas. 

What am I missing?

Thanks in advance. 

Dave

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Re: [Emc-users] OT-bandsaw

[Jan de Kruyf]

the ballbearings!

at least one of the wheels does not run perfectly parallel to the other
wheel anymore.
(my logical reasoning wife will now tell me I cocked up that sentence, bt
never mind)

j.

On Thu, Feb 16, 2012 at 9:22 PM, dave  wrote:

>
> Hi all,
>
> I have a cheapie horizontal bandsaw that has performed decently well
> for 10 years or so and just recently started sheddinga the blade after a
> few turns.
>
> As far as I can tell the blade works its way off the non-driven wheel.
> I suspect the guides (ball bearings) are at fault but will entertain
> other reasonable ideas.
>
> What am I missing?
>
> Thanks in advance.
>
> Dave
>
>
> --
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Re: [Emc-users] OT-bandsaw

[andy pugh]

On 16 February 2012 19:22, dave  wrote:

> I have a cheapie horizontal bandsaw that has performed decently well
> for 10 years or so and just recently started sheddinga the blade after a
> few turns.

I wonder if the blade might have overheated and is now conical?

-- 
atp
The idea that there is no such thing as objective truth is, quite simply, wrong.

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Re: [Emc-users] OT-bandsaw

[Dave]

Dave,

I don't know what kind of bandsaw you have, but I have several bandsaws 
and all of them have a means of tilting one of the wheels (usually the 
non-driven idler wheel ).  If your wheel bearings are good, then it is 
likely that your one wheel needs to be tilted to track the blade.

The other thing that can throw off blades is either an improperly welded 
blade, or the tire (the rubber strip) on the drive wheel and or idler 
wheel is shot and needs to be replaced.   The wheels should appear to be 
crowned when looking at them.  The crown tends to self center the blade 
onto the wheel.

Finally if this is happening on a horizontal saw, the guides that twist 
the blade can throw the blade off also.  Check their alignment.  The saw 
should not throw off the blades with the guides removed (no twisting of 
the blade).

Dave

On 2/16/2012 2:22 PM, dave wrote:
> Hi all,
>
> I have a cheapie horizontal bandsaw that has performed decently well
> for 10 years or so and just recently started sheddinga the blade after a
> few turns.
>
> As far as I can tell the blade works its way off the non-driven wheel.
> I suspect the guides (ball bearings) are at fault but will entertain
> other reasonable ideas.
>
> What am I missing?
>
> Thanks in advance.
>
> Dave
>
> --
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>
>


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Re: [Emc-users] OT-bandsaw

[gene heskett]

On Thursday, February 16, 2012 03:22:53 PM dave did opine:

> Hi all,
> 
> I have a cheapie horizontal bandsaw that has performed decently well
> for 10 years or so and just recently started shedding the blade after a
> few turns.
> 
> As far as I can tell the blade works its way off the non-driven wheel.
> I suspect the guides (ball bearings) are at fault but will entertain
> other reasonable ideas.
> 
> What am I missing?
> 
> Thanks in advance.
> 
> Dave
> 
Probably either the tire on the idler wheel is shot, the bearings in it are 
fini, or more likely, the idler wheels tilt in miss adjusted, whatever.  
That will be as critical to align as it is with any other bandsaw, wood or 
metal.

Since in those saws, the guide bearings also serve to twist the blade a 
few, maybe 30 degrees, I could see the bearing itself wearing out 
internally which would allow the bearing to tilt in a direction that would 
walk it off the idler too, so your idea is not an impossibility, however 
I'd tend to think a bearing worn and tilted to that degree would be pretty 
obvious.

Test:  back the guide bearings off so they aren't touching the blade.  If 
it stays on the wheels then, running in the center of the tire on both 
wheels, then the wheels are in usable alignment.  If it still runs off, try 
a fresh blade, that one could be distorted, and use that fresh blade to 
adjust the idler wheel tilt till it does run true.  Somewhere in this 
testing, it should become obvious whats wrong.  Feel those guide bearings 
to see if they still roll smooth before you bring them back to the blade, 
and can't be noticeably tilted on their own little axles, if they turn 
rough, or can be tilted a few degrees, new ones time.

A metal cutting bandsaw is about the roughest service I can imagine.  And 
that guide enforced twist in the blade has got to be hell on the blade over 
extended run times. Metal fatigue has got to be a factor in blade life. 
Proper tension is probably only half what it could be if the blade wasn't 
being twisted.

I cut alu and brass, using std fine toothed, several per inch anyway, wood 
blades in a 12" Craftsman tilting head saw, using koolblock guides, and 
have found it works well given enough patience since that tilthead frame 
has a lot of give & that motor is under powered, but in 6" thick alu it 
gets the job done and I've only broken one blade in probably 15 feet of 
such cutting as I nibble off pieces of that huge, was 40lbs at one time, 
block of alu.  Obviously a block of paraffin for jelly sealing is kept 
handy to lube the sides of the blade with.  A case of using what you brung 
to the party ;-)
 
Cheers, Gene
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
My web page: 
An economist is a man who would marry Farrah Fawcett-Majors for her money.

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Re: [Emc-users] OT-bandsaw

[John Prentice]

- Original Message - 
From: "andy pugh" 
To: "Enhanced Machine Controller (EMC)" 
Sent: Thursday, February 16, 2012 7:41 PM
Subject: Re: [Emc-users] OT-bandsaw


> On 16 February 2012 19:22, dave  wrote:
>
>> I have a cheapie horizontal bandsaw that has performed decently well
>> for 10 years or so and just recently started sheddinga the blade after a
>> few turns.
>
> I wonder if the blade might have overheated and is now conical?
>
Mine has an adjustment on the idler pulley tensioning mount (two set-screws) 
to alter the alignment of that wheel's axis. I can move my blade across the 
face of the wheel adjusting these.

John Prentice 


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Re: [Emc-users] OT-bandsaw

[gene heskett]

On Thursday, February 16, 2012 03:56:45 PM Jan de Kruyf did opine:

> the ballbearings!
> 
> at least one of the wheels does not run perfectly parallel to the other
> wheel anymore.
> (my logical reasoning wife will now tell me I cocked up that sentence,
> bt never mind)
> 
> j.
 
Of course Jan, particularly if your wife has a built in spell checker and 
is a retired school teacher.  I catch it all the time.  She thinks it is in 
her job description as a wife.  ;-)

Cheers, Gene
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
My web page: 
Win98 error 007: Fatal error: unforseeable condition: Your system has 
booted
without crashing. Shutting down to compensate.

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Re: [Emc-users] OT-bandsaw

[Jan de Kruyf]

nah! she did a semester of logical reasoning, much worse!

My peabrain finally woke up to the facts of bandsaws.

Last time I had this not only were the bearings gone but also the crown of
one of the wheels
was completely eaten away by shavings caught between the blade and the
crown.
We turned a ring with a new crown surface and shrunk it onto the old wheel.
As far as I know that thing is still going strong.

j.


On Thu, Feb 16, 2012 at 10:59 PM, gene heskett  wrote:

> On Thursday, February 16, 2012 03:56:45 PM Jan de Kruyf did opine:
>
> > the ballbearings!
> >
> > at least one of the wheels does not run perfectly parallel to the other
> > wheel anymore.
> > (my logical reasoning wife will now tell me I cocked up that sentence,
> > bt never mind)
> >
> > j.
>
> Of course Jan, particularly if your wife has a built in spell checker and
> is a retired school teacher.  I catch it all the time.  She thinks it is in
> her job description as a wife.  ;-)
>
> Cheers, Gene
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> My web page: 
> Win98 error 007: Fatal error: unforseeable condition: Your system has
> booted
> without crashing. Shutting down to compensate.
>
>
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Re: [Emc-users] OT-bandsaw

[dave]

On Thu, 16 Feb 2012 23:10:30 +0200
Jan de Kruyf  wrote:

> nah! she did a semester of logical reasoning, much worse!
> 
> My peabrain finally woke up to the facts of bandsaws.
> 
> Last time I had this not only were the bearings gone but also the
> crown of one of the wheels
> was completely eaten away by shavings caught between the blade and the
> crown.
> We turned a ring with a new crown surface and shrunk it onto the old
> wheel. As far as I know that thing is still going strong.
> 
> j.
> 
> 
> On Thu, Feb 16, 2012 at 10:59 PM, gene heskett 
> wrote:
> 
> > On Thursday, February 16, 2012 03:56:45 PM Jan de Kruyf did opine:
> >
> > > the ballbearings!
> > >
> > > at least one of the wheels does not run perfectly parallel to the
> > > other wheel anymore.
> > > (my logical reasoning wife will now tell me I cocked up that
> > > sentence, bt never mind)
> > >
> > > j.
> >
> > Of course Jan, particularly if your wife has a built in spell
> > checker and is a retired school teacher.  I catch it all the time.
> > She thinks it is in her job description as a wife.  ;-)
> >
> > Cheers, Gene

Lots of good thinking in the replies. Time to go shopping (off to the
shop) and test. 

Dave
> > --
> > "There are four boxes to be used in defense of liberty:
> >  soap, ballot, jury, and ammo. Please use in that order."
> > -Ed Howdershelt (Author)
> > My web page: 
> > Win98 error 007: Fatal error: unforseeable condition: Your system
> > has booted
> > without crashing. Shutting down to compensate.
> >
> >
> > --
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> > Cloud computing makes use of virtualization - but cloud computing
> > also focuses on allowing computing to be delivered as a service.
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Re: [Emc-users] Encoder wheel [Was: Need advice on 1/16" end mill]

[Steve Blackmore]

On Wed, 15 Feb 2012 16:29:36 -0500, you wrote:

>The plastic, except for temporary fitting wouldn't do for permanent as it 
>will be trapped between the spindle preload nut, and it's locking nut in  
>normal operation.  That is driven tight with a drift punch in the nut 
>slots.  The plastic will 'cold flow', loosening the nut, and that won't be 
>good for things.

The Al flanged bush I have fitted could be made of steel and would
permit a preload nut. It's 5mm thick turned with a flange. The spindle
is 40mm dia, the bush is 50mm + a 10mm flange (70mm total OD). The
flange is drilled and tapped with 5 holes on a 55mm PCD. The encoder
disk is bored 50mm and fixed to the flange with countersunk 3mm screws. 

In my case the preload nuts are inside the headstock casting so it
didn't need to be anything special, just had to hold the encoder wheel
true and in a fixed position relative the spindle.

The lathe has an encoder fitted as standard driven by a timing belt 1:1,
but the encoder is noisy. I had all the materials handy so it was simple
and cheap to make one as a temporary fix. Never got around to finding a
suitable replacement at the right price and to be honest, I stopped
looking as it works so well.

Steve Blackmore
--

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Re: [Emc-users] OT-bandsaw

[dave]

On Thu, 16 Feb 2012 13:36:00 -0800
dave  wrote:

> On Thu, 16 Feb 2012 23:10:30 +0200
> Jan de Kruyf  wrote:
> 
> > nah! she did a semester of logical reasoning, much worse!
> > 
> > My peabrain finally woke up to the facts of bandsaws.
> > 
> > Last time I had this not only were the bearings gone but also the
> > crown of one of the wheels
> > was completely eaten away by shavings caught between the blade and
> > the crown.
> > We turned a ring with a new crown surface and shrunk it onto the old
> > wheel. As far as I know that thing is still going strong.
> > 
> > j.
> > 
> > 
> > On Thu, Feb 16, 2012 at 10:59 PM, gene heskett 
> > wrote:
> > 
> > > On Thursday, February 16, 2012 03:56:45 PM Jan de Kruyf did opine:
> > >
> > > > the ballbearings!
> > > >
> > > > at least one of the wheels does not run perfectly parallel to
> > > > the other wheel anymore.
> > > > (my logical reasoning wife will now tell me I cocked up that
> > > > sentence, bt never mind)
> > > >
> > > > j.
> > >
> > > Of course Jan, particularly if your wife has a built in spell
> > > checker and is a retired school teacher.  I catch it all the time.
> > > She thinks it is in her job description as a wife.  ;-)
> > >
> > > Cheers, Gene
> 
> Lots of good thinking in the replies. Time to go shopping (off to the
> shop) and test. 
> 
> Dave

Back from shop: saw without guides runs without shedding the blade.
Guides are 0.028 spacing for a 0.025 blade. I'll snug them up and check
for perp to bed and try again. Thanks for all the thoughts and
suggestions. 

Dave

> > > --
> > > "There are four boxes to be used in defense of liberty:
> > >  soap, ballot, jury, and ammo. Please use in that order."
> > > -Ed Howdershelt (Author)
> > > My web page: 
> > > Win98 error 007: Fatal error: unforseeable condition: Your system
> > > has booted
> > > without crashing. Shutting down to compensate.
> > >
> > >
> > > --
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> > > Cloud computing makes use of virtualization - but cloud computing
> > > also focuses on allowing computing to be delivered as a service.
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> > >
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> 
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Re: [Emc-users] Encoder wheel [Was: Need advice on 1/16" end mill]

[gene heskett]

On Thursday, February 16, 2012 08:16:36 PM Steve Blackmore did opine:

> On Wed, 15 Feb 2012 16:29:36 -0500, you wrote:
> >The plastic, except for temporary fitting wouldn't do for permanent as
> >it will be trapped between the spindle preload nut, and it's locking
> >nut in normal operation.  That is driven tight with a drift punch in
> >the nut slots.  The plastic will 'cold flow', loosening the nut, and
> >that won't be good for things.
> 
> The Al flanged bush I have fitted could be made of steel and would
> permit a preload nut. It's 5mm thick turned with a flange. The spindle
> is 40mm dia, the bush is 50mm + a 10mm flange (70mm total OD). The
> flange is drilled and tapped with 5 holes on a 55mm PCD. The encoder
> disk is bored 50mm and fixed to the flange with countersunk 3mm screws.
> 
> In my case the preload nuts are inside the headstock casting so it
> didn't need to be anything special, just had to hold the encoder wheel
> true and in a fixed position relative the spindle.
> 
That sounds like the only thing in common is that the spindle shaft has 
bearings.  :)  Your sound like a real machine, but I think Toys would be 
done a disservice when I call mine a toy.

> The lathe has an encoder fitted as standard driven by a timing belt 1:1,
> but the encoder is noisy. I had all the materials handy so it was simple
> and cheap to make one as a temporary fix. Never got around to finding a
> suitable replacement at the right price and to be honest, I stopped
> looking as it works so well.
> 
Its amazing how a little thought often comes up with a better idea than 
OEM, and you can get away with that every place but in the military. :(

> Steve Blackmore
> --
> 
> 
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Cheers, Gene
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
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Re: [Emc-users] OT-bandsaw

[BRIAN GLACKIN]

There is a 4X6 bandsaw group on Yahoo Groups that specializes in tweaking
maintaining and improving the cheap import bandsaws.  They have a very good
tuneup guide in the files which will walk you through all the maintenance
adjustments and upgrades to get your saw back in service.
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Re: [Emc-users] Cutsim (was: Re: Feature request)

[Erik Christiansen]

On 16.02.12 20:43, Anders Wallin wrote:
> Well, one thing is for sure: I will not write a new g-code parser/interpreter.
> There is about three parts to this I think:
...
> - g-code or other input interpreter (LinuxCNC obviously has librs274,
> FreeCAD could work on some internal CAM-format maybe, but that would
> need inventing+work)

Would the ouput of the interpreter be input to this?:

> - libcutsim (stock-model, cutting ops, surface-extraction/update)
> - ui (AXIS has g-code preview, play/pause/stop buttons, etc).

If so, what should that data contain? (If not fully defined yet, what
might one sample require, roughly?)

I only ask because work on a human-readable to gcode translator is
progressing quite satisfactorily, and it seems kinda useful for the
input to the simulator to be also available as LinuxCNC gcode, so we can
machine with it. If the interpreter provides output in both forms, that
is achieved.

Erik

P.S. Why not "write a new g-code parser/interpreter"? It is as relaxing
 as sudoku, and twice as entertaining. ;-)
 (It does admittedly take up a lot of time to do the whole language.)

-- 
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surprise you with their ingenuity.
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Re: [Emc-users] OT-bandsaw

[Gary Crowell]

Neet, I need to look for that group.

My old HF horizontal bandsaw couldn't hold a blade.  After all sorts of
twiddling with it, I finally got around to getting a new blade and it
hasn't thrown it since.

Gary

On Thu, Feb 16, 2012 at 8:30 PM, BRIAN GLACKIN wrote:

> 
>
> There is a 4X6 bandsaw group on Yahoo Groups that specializes in tweaking
> maintaining and improving the cheap import bandsaws.  They have a very good
> tuneup guide in the files which will walk you through all the maintenance
> adjustments and upgrades to get your saw back in service.
>
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> Virtualization & Cloud Management Using Capacity Planning
> Cloud computing makes use of virtualization - but cloud computing
> also focuses on allowing computing to be delivered as a service.
> http://www.accelacomm.com/jaw/sfnl/114/51521223/
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