Re: [Emc-users] Question re crooked headstock

[Steve Blackmore]

On Wed, 07 May 2014 20:13:46 -0700, you wrote:

>On 05/07/2014 03:56 PM, Steve Blackmore wrote:
>
>>
>> As for three bolt mounting - I can't think of any quality lathe with
>> less than 4
>>
>> None of the Myford, Dean Smith & Grace, Colchester, Boxford, Harrison,
>> and the many Swiss lathes I worked on had three bolt mountings?
>
>At the least, Hardinge and Feeler have three point mounts. The bed is a 
>closed box made specifically to be rigid enough to handle all cutting 
>loads with ease. These will cut to tenths all day long.
>
>http://www.practicalmachinist.com/vb/bridgeport-hardinge-mills-lathes/3-point-lathe-mounting-question-116076/

Nice idea if the bed is rigid enough. 

Personally, never seen one - big American lathes were rare here when we
actually made stuff. Eastern European were more common. 

Steve Blackmore
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[Emc-users] mesa 7i76 and 5i25

[Erik Friesen]

The 7i76 datasheet says 8-32v input.  It would be handy for me to use my
40v supply.  Is there some reason this won't handle more than 32v?

Reasons for questioning..

A8499 = 50v 


Input cap = 63v

Question 2 for the 5i25:  How do I go about using mesaflash on linux?  I
tried running mesaflash from the command line but it just says command not
found.

Last go around the linux utility wasn't out, so I used the dos utility and
it took all day to get it right, plus had to program the card in a
different machine.
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Re: [Emc-users] mesa 7i76 and 5i25

[Peter C. Wallace]

On Thu, 8 May 2014, Erik Friesen wrote:

> Date: Thu, 8 May 2014 08:35:03 -0400
> From: Erik Friesen 
> Reply-To: "Enhanced Machine Controller (EMC)"
> 
> To: "Enhanced Machine Controller (EMC)" 
> Subject: [Emc-users] mesa 7i76 and 5i25
> 
> The 7i76 datasheet says 8-32v input.  It would be handy for me to use my
> 40v supply.  Is there some reason this won't handle more than 32v?


Yes, the output drivers are rated 40V absolute max and the firmware will
bellyache about it if VField  > 34V or so

>
> Reasons for questioning..
>
> A8499 = 50v 
> 
>
> Input cap = 63v
>
> Question 2 for the 5i25:  How do I go about using mesaflash on linux?  I
> tried running mesaflash from the command line but it just says command not
> found.
>

If you got it from the zip file you need to
chmod +x mesaflash to turn on the execute permission


so then

sudo ./mesaflash --device 5i25 --write someoldfpgafile.bit

ought to work


remember you need to power cycle the PC to load the new firmware

> Last go around the linux utility wasn't out, so I used the dos utility and
> it took all day to get it right, plus had to program the card in a
> different machine.
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Peter Wallace
Mesa Electronics

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Re: [Emc-users] mesa 7i76 and 5i25

[andy pugh]

On 8 May 2014 13:35, Erik Friesen  wrote:
>  How do I go about using mesaflash on linux?  I
> tried running mesaflash from the command line but it just says command not
> found.

zip compression tends to lose the execute bit, you may need to chmod
it. You also probably need to use a full path and a leading dot-slash.
( ./mesaflash ... )

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Re: [Emc-users] mesa 7i76 and 5i25

[Erik Friesen]

Thanks for this info.

How might I go about beefing an input to handle a 40v input?  I'd like to
monitor the main supply somehow(with analog).

I have a hot air gun, could change a resistor, or perhaps just add an
external to adjust the divider?  It looks like you use arrays.

@Peter A side note, mesa board routing is very nice.  What Cad program are
you using?  These aren't autorouted, are they?

Silkscreen pinout def's would be nice on these boards though.


On Thu, May 8, 2014 at 9:54 AM, andy pugh  wrote:

> On 8 May 2014 13:35, Erik Friesen  wrote:
> >  How do I go about using mesaflash on linux?  I
> > tried running mesaflash from the command line but it just says command
> not
> > found.
>
> zip compression tends to lose the execute bit, you may need to chmod
> it. You also probably need to use a full path and a leading dot-slash.
> ( ./mesaflash ... )
>
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>
>
> --
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> out:
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Re: [Emc-users] mesa 7i76 and 5i25

[Peter C. Wallace]

On Thu, 8 May 2014, Erik Friesen wrote:

> Date: Thu, 8 May 2014 11:52:11 -0400
> From: Erik Friesen 
> Reply-To: "Enhanced Machine Controller (EMC)"
> 
> To: "Enhanced Machine Controller (EMC)" 
> Subject: Re: [Emc-users] mesa 7i76 and 5i25
> 
> Thanks for this info.
>
> How might I go about beefing an input to handle a 40v input?  I'd like to
> monitor the main supply somehow(with analog).
>
> I have a hot air gun, could change a resistor, or perhaps just add an
> external to adjust the divider?  It looks like you use arrays.

The input divider is a total of 22K Ohms and 36.3V full scale so a series 
resistor of sat 4.99K would get you to 44.55 V full scale

>
> @Peter A side note, mesa board routing is very nice.  What Cad program are
> you using?  These aren't autorouted, are they?
>
No, hand routed with PadsPCB (Mentor now)


> Silkscreen pinout def's would be nice on these boards though.
>
>
Not much room unfortunately, maybe a few signals could be labeled


> On Thu, May 8, 2014 at 9:54 AM, andy pugh  wrote:
>
>> On 8 May 2014 13:35, Erik Friesen  wrote:
>>>  How do I go about using mesaflash on linux?  I
>>> tried running mesaflash from the command line but it just says command
>> not
>>> found.
>>
>> zip compression tends to lose the execute bit, you may need to chmod
>> it. You also probably need to use a full path and a leading dot-slash.
>> ( ./mesaflash ... )
>>
>> --
>> atp
>> If you can't fix it, you don't own it.
>> http://www.ifixit.com/Manifesto
>>
>>
>> --
>> Is your legacy SCM system holding you back? Join Perforce May 7 to find
>> out:
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Peter Wallace
Mesa Electronics

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[Emc-users] Some tentative progress on stiffening up the countershaft mounting

[Gene Heskett]

Hi all;


I have a bracket of sorts about half made, two pieces of 1/8"x1" strap, 
with about 5/8" of each end bent over at about 90 degrees.  One piece is 
about 3/4" long, and that leg is drilled for a pair of 6x1 bolts which 
will be used to bolt it to the base of the bed, more of less under the 
left end of the countershaft frame as seen thru a hole in the casting 
intended to get all the wiring to the OEM motor in and out of the plastic 
box screwed to the front of the bed which still contains the old 
controller, but the wiring now goes only to the motor power switch on top 
of the box.

I am thinking of welding or just bolting, a good hard 3/8 or 7/16 bolt, 
which will reach thru this wiring hole and pull down on that end of the 
counter shaft frame, but the hole isn't quite big enough to really do it 
right.

So my question, seeing as how that will open the casting a bit, is:  Can I 
grab a 1/8" mill in the dremel, and expand that hole to the left about 
1/4" without weakening or warping the casting?

FWIW, the Union Tool Co. level says the bed angle, high in front because 
the v-way is sticking up, is sitting at 175.5 degrees on both ends of the 
bed, so if it is warped, its not enough that I can actually measure.  I 
thought it had a vernier scale, but I guess not.

The long leg of this strap will have a short piece of this 1/8" bolted 
across the outside face of it so it cannot back out of the hole.  The two 
pieces will have a 6mmx1 draw bolt to pull the longer, upper leg down, 
which is carrying the bolt reaching thru this wiring access hole.

But the first thing I need to do is go get a decent 1/4" chuck, and make 
me an extension about a foot long for the drill so I can drill straight 
into the casting, and tap it too, at as close to perpendicular as I can 
get.  My smallest drill is too fat bodied and is held at about a 10 degree 
angle by the mounting board.

I'd head out to get that chuck at Lowes right now, but the car is gone, 
and the GMC was just delivered to a body shop for rust repairs, they 
couldn't put a fresh sticker on it...  Down to one set of wheels is a 
PITA. :(

Another thought would be to drill another nominally 3/4" hole, below and 
left of this one, which would let me reach in, and drill/tap a 5/16-18 
hole for a 5/16" cap screw in the counter shaft's left frame.  That 
counter shaft frame is hard (works like 7078-T6) 1/2" thick alu, and I can 
bury at least 1/2" of that cap screw in it before it even thinks of 
hitting the shaft bearing.  If I don't have to dismount the z screw to 
install the cap screw.  OTOH, I'll have to dismount it anyway just to 
stick a uni-bit in to drill the hole.

Good excuse to take the rest of the end play out of that bearing assembly, 
no? ;-)

Cheers, Gene
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Re: [Emc-users] center finder camera

[Jon Elson]

On 05/04/2014 11:20 PM, Steve Blackmore wrote:
> Jon - http://imagebin.org/309092
>
> Tip of camera just touching surface. That's a 0.1mm gap set on the jaws
> of my Mitu digimatic calipers. The ground surface looks good until you
> zoom in :) Plenty good enough to find an edge.
>
Well, I don't want to have to get the camera all the way to 
touching,
with a rigid mount in the spindle.  So, I have to make it 
work a bit
backed off from the work.  I got the unit today, and without 
zooming
the image from the camera, I'm not sure I can get .001" or 
better
alignment.  But, with zooming in, I'm sure I can do a lot 
better.
I tried it on my 3.5 GHz i5 system with Ubuntu 12.04, and it
works very well, with a great update rate.  I'm going to have to
update the computer on my Bridgeport as it is REALLY old and
only has USB 1.1 (maybe even 1.0).  I used guvcview, it
worked immediately, but doesn't seem to have a zoom function,
other than expanding the entire window.  Cheese seems to be
the same.  VLC gives you a 2:1 zoom as the only option.
There's a setting for "interactive zoom" but I couldn't
see that it did anything.  Also, there's about a 3/4 second
lag with VLC that I did not see with the other packages.
That might be annoying when using it for edge finding.

So, I have to set up a new LinuxCNC computer and then see
how well this works with the camview package.

Jon

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[Emc-users] Lathe twist [Was: Some tentative progress on stiffening up the countershaft] mounting

[Erik Christiansen]

On 08.05.14 17:35, Gene Heskett wrote:
> FWIW, the Union Tool Co. level says the bed angle, high in front because 
> the v-way is sticking up, is sitting at 175.5 degrees on both ends of the 
> bed, so if it is warped, its not enough that I can actually measure.  I 
> thought it had a vernier scale, but I guess not.

If resolution is 0.5°, then that'd pick up a 50 thou twist on a 5" wide
bed. If 0.01°, then 10 thou is detectable. With a 0.02mm/m machine
level, one division is 0.00115°, and it's big enough to visually divide
by two or three. But even a full division is 1/10 thou across 5", if I'm
counting right. (You just have to wait a good half a minute for the
bubble to settle, for full accuracy.)

My lathe also has the v-way sticking up at the front, so I bought a new
1/2" square HSS lathe tool blank, to use as a nicely ground spacer on
the flat rear shear. (But then just plonked the level on the flat-topped
cross-slide, since that's what must travel level, anyhow.)

Erik

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