Hello all,
The title really says it all but for a little more context I will explain my problem. All units are in Inches
The machine is a 2020 Haas VF2SS. The company bought the machine and it sat for two years until I was hired a few months ago. I've always had trouble with true positions, mainly .005" TP or tighter. To day I decided to check for backlash (which shouldn't be an issue but worth checking anyway.)
All the values in the compensation tables were set to 0 or "Empty". I put my magnetic base on the vise with a 2" Drop indicator against the spindle on the X axis (I also tried with a .0001 Test indicator). All equipment used is Brand New, I bought it when I was hired. I am the only machinist, one man show, so no one has messed with the machines or equipment. Anyway, I zeroed the indicators at the middle of their travel, 1" on the Drop indicator and .004" on the Test indicator. I returned to zero, kept the travel direction the same, etc.
The results are as follows on X axis:
Machine Jogged +1.0000", Indicator read .9995"
Machine Jogged -1.0000" , Indicator read -.9995"
Zeroed at -1.0000", Jogged 2.0000" and Indicator read 1.9990"
The results are as follows on Y axis:
Machine Jogged +1.0000", Indicator read .9999"
Machine Jogged -1.0000" , Indicator read -.9999"
Zeroed at -1.0000", Jogged 2.0000" and Indicator read 1.99985"
I added values to the compensation table but it does not help with this issue. Is this not backlash? The engineer I was working with told me its a calibration issue. I have a hard time understanding how this is possible on a brand new machine. On other forums I've seen explanations ranging from "replace thruster" to "It's a haas, thats what they do"
I had a job come in with a TP of .0005" and i tried every trick in the book, the closest I got was .0004 TP on one hole, on one part.
TLDR: I am having trouble holding True position. checked for backlash, compensation table did not make a difference. it under travels by .0010" in the X + and - direction over 2" and under travels .0002" in the Y + and - direction over 2"
Any information would help me at this point. I have a haas tech coming in, is there something I should ask him to do while he's here?