Hello Guest it is December 06, 2019, 08:20:00 AM

Author Topic: Repetitive accuracy shift  (Read 1427 times)

0 Members and 1 Guest are viewing this topic.

Repetitive accuracy shift
« on: June 09, 2014, 08:46:13 AM »
Hi,

I have my mill set up with steppers and everything seems to be moving smoothly with no steps missed. When I calibrate the steps per unit, and run four test runs in a row, in the same direction, after every two runs it changes .005" (example: .100, .100, .105, .105, .110, .110 etc). It is very repetitive in this pattern and is present in all three axes. Any thoughts?

Offline Hood

*
  •  25,856 25,856
  • Carnoustie, Scotland
    • View Profile
Re: Repetitive accuracy shift
« Reply #1 on: June 09, 2014, 01:35:15 PM »
Please attach your xml.
Are the readings you mention true readings or Machs DRO readings?
Hood
Re: Repetitive accuracy shift
« Reply #2 on: June 09, 2014, 10:00:53 PM »
Hi Hood,

It is the actual measurement, with a dial indicator. It is just very strange how repetitive the error is, yet only ever other test run. Thanks

Offline Hood

*
  •  25,856 25,856
  • Carnoustie, Scotland
    • View Profile
Re: Repetitive accuracy shift
« Reply #3 on: June 10, 2014, 03:34:32 AM »
Please attach your xml and I will see if I can find an issue in it.
Hood