Messages

591

Mach4 General Discussion / ShuttleXpress Plugin

« on: October 10, 2015, 04:48:59 AM »

Hello,

May I ask, any chance of a Shuttle Xpress plugin (or is the "pro" plugin version able to be used with the shuttle Xpress?)

Rob

592

General Mach Discussion / Re: backlash and slaved axis

« on: April 01, 2015, 06:17:22 PM »

Err, yes using a USB SS, in hindsight that probably is the problem.

I was wondering is there anyway that you could prefix some code into to the way that mach looks at trajectory moves so that it ignores the first 20 steps say when changing direction (which is equivalent to my backlash), the catch would be when making minor moves or combined axis moves ....

probably not is the answer

Thanks again for your time

593

General Mach Discussion / Re: backlash and slaved axis

« on: March 31, 2015, 07:54:26 PM »

Thanks Rich for the response.

I have tried it already (would not have asked without having a go), but I got some real odd behaviour.

Set Y = 0.2mm backlash, A = 0mm -> no difference
Set Y = 0mm backlash, A = 0.2mm -> no difference
Set Y = 0.2mm backlash, A = 0.2mm -> backlash got way worse (like 0.4mm or worse (basically the A axis did not move (sorry only one dial indicator and I was focusing in on the A).
thought I'd give it a go .... set Y = 0.2mm, and A = - (yes minus) 0.2mm and it seemed to advance ~0.2mm.... on the A axis...

Hence a little stumped after an evening of playing with a dial indicator.

Thanks

Rob

594

General Mach Discussion / backlash and slaved axis

« on: March 31, 2015, 12:34:07 PM »

Hello,

as per title, have a question regarding setting up backlash on slaved axis.

If I have "Y" and "A" set up as slaved axis on a machine, how would you setup backlash, does the "Y" and the "A" axis get different numbers?

What about if one stepper motor drives one direction and the other drives the other direction, how would backlash be dealt with in this appliaction?
(think of a rack and pinion driven machine with two steppers each driving on a rack, but in opposite directions to get the carriage to move obviously in one direction).

Thanks for your time, any advice welcome

595

General Mach Discussion / Re: New PlugIn just about done..

« on: March 25, 2015, 08:06:10 PM »

New user question on the shuttlexpress ....
Got the v3 plugin installed and 5 buttons configured as: x/y/z/ none/ increment cycle

The thing is I jog an axis (outer dial / rapid jog), and release the button and the axis although nearly stops, continues to coast at a very slow step rate, until I use an estop or jog the outer wheel in the opposite direction (which sometimes halts it)

Setup is usb ss with a cheap parrallel port bob and tuned leasdshine am882 steppers on three seperate supplies
42v for steppers (switch mode ps), 12v smps, with a 5v isolated ps for the bob.  The ss is powered by the PC 5v usb.

Dell dimension 5000 PC running xp plus 1gb ram with usb keyboard mouse shuttlexpress (manufactures driver uninstalled) and usb ss with latest usb driver and plugin installed

At the moment I'm just doing some touch probe work (probeit) and the jog with the shuttle pro just is not happy and continues a slow coast in the same direction as the shuttlexpress jogged direction.

Unplugging the shuttlexpress and using the keyboard jog keys and I have no issues

Suggestions welcome

New bob on the way (need more ports plus hoping to provide some noise filtering using a cm-106 bob at 24v when I get round to firing up the plasma (new can of worms maybe with a usb ss bought a long time ago, may change to a ess in the end)

Thanks

Rob