...there is backlash on the optical scale. Being optical, I thought it would be backlash free. On my scales, there are skids that ride on the glass, so a tiny bit of friction. Probably about a micron (my readout is only 2um, so not a big issue).
Always good to learn new things. On a sealed scale with rubber seals it can be worse but you can remove the strips if a clean environment.
Backlash here also may not be drag in the scale, it could be our very good friend
Abbe.
So often this is blamed on scale assembly drag or head mount flex.
Even with no skids and no contact at all this backlash error from scale to actual movement remains. Puzzle me that.
Welcome to the world of CMM design, what should work does not do so well at microns.
"I spent $50 large and plus I should be able to trust it to a few tenths".......... ROFLMAO.
I do most certainly know how to come in and do an align and calibrate on your CMM to give you this nice feeling at a tenth.
I also know that it is a lie but please pay the invoice.
People want good news and that this is fixed or okay. So you do what customers want.
The customer will not know a easy check vs a hard one. Do the simple, make a report. Not like it is your shop when doing such as a paying job.
That last sentence came home more that once when doing field calibrations and alignments.
Boss not happy at times that I would try to educate customers. Fixed rate go in get out.
As a aside I have no idea why Roh’Lix could not come to the front of my head.... sucks to get old and now feel like a old fool in a rocking chair on the porch as all you pass me by.
Dinosaur Bob