Re: [Emc-users] Equipment I just got for free.

2013-03-27 Thread Gregg Eshelman
--- On Tue, 3/26/13, Stan sta...@telus.net wrote:

 From: Stan sta...@telus.net
 Subject: Re: [Emc-users] Equipment I just got for free.
 To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
 Date: Tuesday, March 26, 2013, 10:07 PM

 how much is he asking for the unit?

Which unit?

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Re: [Emc-users] Cable drive for a gas torch pattern follower?

2013-03-27 Thread Gregg Eshelman
--- On Mon, 3/25/13, jeremy youngs jcyoung...@gmail.com wrote:

 From: jeremy youngs jcyoung...@gmail.com

http://www.ebay.com/itm/3Axis-Nema-23-Stepper-Motor-425oz-in-CNC-Mill-Controller-SD-2H044MA-driver-/130835449799?pt=LH_DefaultDomain_0hash=item1e766687c7

Those might be a bit much for the torch arm, 3 newton meters. That's the torque 
rating used on many Bridgeport type mills. I can move the torch around with one 
finger.

Those motors might be just the thing for an h-bot drive X-Y gantry, depending 
on how heavy the cross beam is.

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Re: [Emc-users] 3PWM on 7i43 MESA board

2013-03-27 Thread Peter Blodow


What is GUNDAM's syndrome? Belonging to the category of Murphy's legal 
advice system?

Peter


Am 25.03.2013 18:44, schrieb Roberto Sassoli:

 Il 25/03/2013 00:31, emc-users-requ...@lists.sourceforge.net ha scritto:
 Message: 7
 Date: Sun, 24 Mar 2013 16:22:55 -0700 (PDT)
 From: Peter C. Wallacep...@mesanet.com

 Note: the Encoder is always needed, as is enable unless you have special
 provisions to disable drive when PWM is not toggling. The sense signals and
 hall signals are just GPIO so there are really no wasted pins. (even on a 
 7I39
 if you dont use the hall /sense pins the Hall pins can be used as inputs and
 the sense pins for input or output)

 The 3 phase PWMgen has no connection at all to the hall, encoder or sense
 signals although some configs wire the 3pwmgens fault input to a sense pin

 ok
 i've understand the situation...
 i've read the SVTP6_7i39.PIN of hostmot's files on my EMC2 computer, but
 the SVTP4_7i39.pin file send to me from Andy Pugh is complete with GPIO
 on all pins and clarify the situation
 can i use the firmware ;-)))
 for best use of all, i'll must mix carasteristics of 7i39 with
 7i30/7i32/7i33 cards... maybe the 7i43(400) can supply all the thread...
 it's an hard way for me, but the knowledge , the curiosity, the mental
 insanity and the GUNDAM's syndrome are my best friends
 ;-)))
 ciao
 Roberto




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Re: [Emc-users] Equipment I just got for free.

2013-03-27 Thread Stan
the big old rusty CNC mill you posted pix of, thought that was what this 
thread was about

On 3/27/2013 2:10 AM, Gregg Eshelman wrote:
 --- On Tue, 3/26/13, Stan sta...@telus.net wrote:

 From: Stan sta...@telus.net
 Subject: Re: [Emc-users] Equipment I just got for free.
 To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
 Date: Tuesday, March 26, 2013, 10:07 PM
 how much is he asking for the unit?
 Which unit?

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Re: [Emc-users] Equipment I just got for free.

2013-03-27 Thread Gregg Eshelman
--- On Wed, 3/27/13, Stan sta...@telus.net wrote:

 the big old rusty CNC mill you posted
 pix of, thought that was what this 
 thread was about

The guy said he wanted $300 but when I said I was interested in it he wanted to 
raise the price. He also has an old 13 LeBlond lathe in need of a lot of TLC, 
which he wants way too much for.

Trying to communicate the concept to him that these pieces of equipment aren't 
magically worth now what they would be all fixed up and fully functional just 
because I would like to buy them.

At $300 for that mill, I should be able to have it fully working for a total of 
under $2,000. I've been doing a lot of searching online and it looks like 
completely replacing the electronics and axis motors could be cheaper, or at 
least cost no more, that repairing the old original Anilam system. If I want to 
go with steppers I can get three motors, drivers, power supply and controller 
for less than one old used Baldor DC servo motor.

Then I'd still need one old Fenner servo driver board plus whatever's defekt in 
the control box where the CRT is laying loose inside.

I'm going to put the two Compumotor 500 boxes on ebay, whatever I get from 
those will go towards the mill project, if I can get the tool hoarder to let go 
of it.

You should see this guy's place. He has a huge building which was built around 
a giant Cincinnati planer, which must be 20 or more feet tall. He has lathes, 
vertical and horizontal mills ranging from Bridgeport to oh-my-gawd size, 
including one KT 2D, two or more jig bores, shapers, grinders, an antique 
printing press and many cabinets full of tooling, and more cabinets full of 
type for the printing press. He also built three overhead gantry cranes for 
loading and unloading the big machines.
Then there's all the stuff outside, including long rows of metal cabinets 
filled with who knows what.

Does he actually *use* any of this? No. The place is so packed there's just 
trails through it and to actually use any of the machines would require 
shifting around a lot of stuff. The giant planer can't be used because its bed 
would knock over a dozen other machines. The LeBlond he just dragged in, 
connected power to, checked that it'd run and there it has sat ever since.

He has some items for sale bit is always a pain to pin down on price. When he 
does sell something he goes right out and buys more to fill the hole.
He'd like to sell the property and everything on it. The shop building would be 
a really nice place, once about 75% of the excess stuff is moved out so the 
mega-planer and other usable/restorable machines could be used.

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Re: [Emc-users] Equipment I just got for free.

2013-03-27 Thread jeremy youngs
at a 1000 i would buy it . i would not wait on this :)
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Re: [Emc-users] Equipment I just got for free.

2013-03-27 Thread andy pugh
On 27 March 2013 21:23, Gregg Eshelman g_ala...@yahoo.com wrote:

 The shop building would be a really nice place, once about 75% of the excess 
 stuff is moved out so the mega-planer and other usable/restorable machines 
 could be used.

Planers tend to be really slow, but that wouldn't matter if you didn't
have to stand and watch it.

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[Emc-users] convert g1s to g2/3s

2013-03-27 Thread Frank Tkalcevic
Does anyone know of a script that converts G1 line segments into G2/G3
curves?  In the src tree I found author.py which has an implementation of
the Douglas-Peucker simplification algorithm, but I can't see where it is
used.  Is there a script anywhere that uses it?

 

I want to use this to simplify the output of the 3d printer software Slic3r.
It only generates line segments which slows down my router.  Most of my
shapes have circle shapes, so it would be nice to use G2/G3.

 

I've tried a trial version of a program I found on the 'net, but it didn't
work because there are A axis moves on each line (A = extruder).

 

Frank.

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[Emc-users] tach feedback

2013-03-27 Thread Stuart Stevenson
Gentlemen,
  If I am wanting to remove the servo tuning from a velocity loop would I
be able to jumper the +/- 10 volts to the tach feedback into the drive and
to the speed request into the drive.
Would this cause the drive to not respond?
Would this cause the drive the immediately output the full requested
current to the motor?
thanks
Stuart

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Re: [Emc-users] tach feedback

2013-03-27 Thread TJoseph Powderly
On 03/27/2013 10:43 PM, Stuart Stevenson wrote:
 Gentlemen,
If I am wanting to remove the servo tuning from a velocity loop would I
 be able to jumper the +/- 10 volts to the tach feedback into the drive and
 to the speed request into the drive.
 Would this cause the drive to not respond?
 Would this cause the drive the immediately output the full requested
 current to the motor?
 thanks
 Stuart

you make the system very happy:)

there's no error for the amp to work with, only the commanded voltage 
which is now the tacho out.

in op-am terms, you took the whatdoyouhave and plugged it into the 
whatdoyouwant

eliminating all error

so its kind of a catch 22,
i'd say you get nothing out if you start with no velocity

and keep the velocity if it wasnt 0 ( hard to do , you have to be 
infinitely quick with the jumpers)

my2c
tomp

if you know the HitchikersGuide, this is what they did to the robot 'colin'


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Re: [Emc-users] tach feedback

2013-03-27 Thread dave
On Wed, 2013-03-27 at 22:43 -0500, Stuart Stevenson wrote:
 Gentlemen,
   If I am wanting to remove the servo tuning from a velocity loop would I
 be able to jumper the +/- 10 volts to the tach feedback into the drive and
 to the speed request into the drive.
 Would this cause the drive to not respond?
 Would this cause the drive the immediately output the full requested
 current to the motor?
 thanks
 Stuart
 
Whoa!
tach feedback is negative if it matches the input drive then you do
not accelerate...i.e constant speed.
Think of it as a summing junction on an op amp with the other input
being the velocity voltage. 
I think I have that right even at my age. ;-)

This is what make velocity drives so easy to tune as opposed to torque
drives. The tach feedback is a loop inside the velocity input. 

Dave


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