Messages

681

General Mach Discussion / Re: Backlash compensation for a rotary axis ?

« on: March 09, 2008, 01:10:54 AM »

TP

I wish I could. 

This is a small industrial reduction box and was not designed for precision application.  Final drive is fairly stiff.

Chip

Thanks for trying that. I suspected compensation could work OK in this situation.

I might go ahead and turn up the input adapter and a spindle shaft and give it a "Temp setup" try.

A couple of wood turning chucks that I have should work well.

Greg

682

General Mach Discussion / Re: Backlash compensation for a rotary axis ?

« on: March 08, 2008, 08:04:31 PM »

G'day RC

I get what your saying with loading the spindle in one direction.

In this case I would not go that far. 

Unless I see a fairly good prospect of this working well I will go off in some other direction.

I suspect that some of the drawbacks with Mach3's backlash compensation would not apply in this limited situation.

However I would really like to hear some feedback from those who have tried it.

Greg

683

General Mach Discussion / Backlash compensation for a rotary axis ?

« on: March 08, 2008, 06:16:15 PM »

I've always been of the opinion that backlash is something you deal with via mechanical design and not software.

However I have a worm drive gearbox that I would like to use as the basis for a rotary axis.

It has a very small amount of backlash which I can not eliminate by mechanical means.

I am interested in any ones experiences in a similar situation using backlash compensation in Mach.

The main driven shaft which would become the rotary axis spindle is quite stiff and for engraving
on a cylinder and other light jobs I think it would be OK.  It won't slop back and forth.

But I still have to account for the small amount of movement in the driven shaft before the main shaft will change direction.

Anyone with an informed opinion?

Greg

684

Brains Development / Re: Terminating a brain with "Execute Button Script"

« on: March 05, 2008, 10:06:29 PM »

G'day Scott

Yes I have a version of your macropump working. Thanks for that.

I did not follow Art's explanation.  And seems to me a different response from Brian.

When I spotted that "Execute Button Script" option my eyes lit up.

Sadly it seems it is not implemented.

Greg.

685

Brains Development / Terminating a brain with "Execute Button Script"

« on: March 05, 2008, 05:06:36 PM »

I am revisiting this idea where I wanted a brain to set a script going.

Poking around the brain editor I found "Execute Button Script" in the Button Press selections for Lobe Terminations.

How does this work? Does it work? How do I specify the button script to execute?

Thanks for any help, Greg

PS:  I have also asked this on the Yahoo group.

686

Mach SDK plugin questions and answers. / Re: Shuttle Xpress Problem

« on: March 03, 2008, 01:07:32 AM »

Ahh Yes....Multi axis moves would be nice.   

Greg

687

Mach SDK plugin questions and answers. / Re: Shuttle Xpress Problem

« on: March 02, 2008, 11:16:18 PM »

I jog continuously or incrementally X, Y and Z axis with my Shuttle Pro.  Just one device.

I thought everybody did.   

Greg

688

Mach Screens / Re: re tab out jog control

« on: March 01, 2008, 08:01:17 AM »

The arrows are correct if you are standing in front of the table and origin is lower left. This is conventional.

If the axis is moving in the wrong direction that can be changed in,

Config / Homing and Limits / check "Reversed"

Greg

689

Brains Development / Re: Terminate a brain with "run macro M650.m1s" ???????

« on: February 28, 2008, 07:52:56 PM »

Scott

I have it all working as I wanted.

Using the brain to apply the switch delay (for safety)

Brain also takes care of checking that spindle and movement are not active (more safety)

Then hands it over to the macropump  ( a simpler version now)

It has the interlock and triggers the M615

I have learnt some new stuff. 

Thanks heaps for your help Scott

Greg

PS: that Ismoving() worked as you said but I'm not doing it that way now.

690

Brains Development / Re: Terminate a brain with "run macro M650.m1s" ???????

« on: February 28, 2008, 08:46:40 AM »

Thanks Scott.

Will try in the morning.  1:00 AM here. 

Greg