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Topics - mkaman

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General Mach Discussion / Mach3 turn newbie questions:
« on: August 02, 2009, 05:29:22 PM »
Ok I'm a complete newbie to CNC turning and I have some questions before I spend money.  I have done some reading and some things I do understand, while some things I don't.   

In Mach3 turn I understand about the tool X and Z offsets for tool changes and wear offsets, but what I don't understand is how to position the toolpost for a tool change.  Say I'm turning a part (55 degree insert) that is 1" long by .75" diameter and want to switch to a cutoff tool, and minimize the distance the cross slide travels to make the tool change. I will not be using limit switches. 

Most of my work would be done without the tailstock, but eventually I will try turning between centers.

If someone can shed some light on things in a simple format, I would appreciate it.  I often suffer from migraine headaches, so things take a while to sink in sometimes. 

Michael

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General Mach Discussion / Enabling backlash comp in 3.041
« on: November 07, 2008, 07:22:20 AM »
I have a tabletop mill setup and am looking for ways to enable backlash comp in 3.041. 

I currently have .004 backlash in the X, .002 in the Y and .004 in the Z.  I'm using Kerkote 4tpi leadscrews.

System specs: Gecko 250 driver box and 300 oz in  steppers.  Mach setup; kernel speed 45000khz, CV mode on, distance mode to absolute, IJ mode to Inc.

Without backlash enabled the system runs smooth, if I enable backlash, it seems everything bogs down.

Any ideas?

TIA,
Michael

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