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Messages - tinkerer360

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1
General Mach Discussion / Re: motor tuning
« on: November 06, 2006, 06:53:02 PM »
thx for the fast reply guys.....

My unit is a ballscrew driven cnc router, I am using a xylotex board and Mach3 software.

As for setting the values I did that manually...basically I kept on adjusting the value untill the circle's ID matched (using calipers) what I drew in the software, i.e. ID 4.015". At that point I assumed that I was done calibrating/tuning the motor... the number came out to be ~6400 for both the x and y axis

I haven't used the auto steps per unit botton, I will try that tonight and see if my number and the number mach3 spits out are the same...i'll also try to put the unit in sherline mode and see what happens.....

As for backlash I'm not sure how I check the value of this.......I do notice some backlash thought I assume its about 4-7mils, 0.004-0.007", but I'm not sure....any good websites on how a non-pro can learn how to accurately figure out the backlash of an axis?????

thxs a bunch guys, I'll work on it tonight and report my findings...
eric


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General Mach Discussion / motor tuning
« on: November 06, 2006, 04:29:31 PM »
Hi All,
I'm new to this so please bear with me.....I have tuned my motor using the steps per setting and am able to get consistant measurement for the value I used for tuning the motors, i.e. 4inches, but any other distance will be slightly off. whats going on, how do I find out if I'm losing steps, what is the screw mapping function and where is it explained in the manual, is screw mapping standard procedure for "tuning motors?
-Here is what i'm using to set up my mill;
circular "pocket" designed in software
ID 4.015
OD 4.287

after milling I get
 
ID 4.018+/-0.007
OD 4.330+/-0.007

these numbers are pretty consistant if I run multiple parts
I think the ID is set perfect but the OD is off, I guess my question is what other setting need to be made to get the correct distance value for any distance.
any help understanding what I need to do will be appreciated.
thx, eric
 

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