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After reading numerous posts on the subject, it could be:
Backlash
Thrust bearings
Gibs loose
Excess following error
Poorly tuned servo motors
Did I miss anything?
Good luck, detective!
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Not sure if this is where this post should be but i am putting it here anyways..
We have an older machine an Exel Mustang VMC with a Fanuc O-M controller. When i clean a round circle well...it just doesnt cut round. I assume it is backlash. Now how does one correct this..is it a controller fix or do the ball screws have so much play they need to be replaced. They dont look overly worn for a 1991 machine..
After reading numerous posts on the subject, it could be:
Backlash
Thrust bearings
Gibs loose
Excess following error
Poorly tuned servo motors
Did I miss anything?
Good luck, detective!
no...i think you covered it very well...i am going to have my work cut out for me i think...Originally Posted by beege
Forgot one: Check the fit of your tool holders in the splindle taper also.
If you have the old analog style drives (I think you do on the 0M), you may just need to ballance the following error between X and Y. There is a diagnostic that you can use to see the following error. Making a 45 degree X-Y move at a typical cutting feedrate should show the same following error in X as in Y, and the following error should be the same in each direction. Tweaking pots on the servo amplifiers can ballance them. I believe that RV2 is used on the old analog servo boards for this.
http://www.kentechinc.com/tip2.html
This will show you how to fix it.
followed the procedure in the link worked great....but now i am having some trouble setting the parameters....enable the pwe...go to the parameters i need and try to enter the values but nothing inputs...
Have heard so many horror stories about fanuc and wiping parameters i dont want to touch something i dont know about...shgould i be in MDI to change parameters???
PWE setting
in MDI, under "settings" page, set PWE = 1
then parameter changes under "service" page
When complete, go back to "settings" page, PWE = 0
Some parameter changes require reboot to be effective, so, power off and on again just to make sure.
still no luck...
1. set pwe to 1
2.bring up parameter list by pushing dia. soft key
3.go to parameter...in this case 535
4.parameter current value is a single 0
5.want to enter a value of 13 so i type 13 and push input
6. nothing happens so i enter a value of 00000013 and push input
and again nothing happens
7. set pwe back to zero ...hit reset and power down...
8. power up and still no change
I know it is just something simple...missing a step or hitting wrong button somewhere...
ok...wrong button...not diagnostic button...
scoll with cursor and page down..
think i got a handle on it now...
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