RS-670 TP200b problems

[jacyEd]

We have been using a TP-200 with out RS-670 running 3.7 MR3. The probe has pretty much reached the end of its lifespan and we attempted to replace it with a more appropriate 200b due to the fact that we have the cmm on an open floor with other machines causing some vibration. The issue is that I am unable to calibrate using the 200b. It reads a stylus diameter of .0778 while I run a 2bx30mm (.08) probe. Right now the theoretical diameter is .0787 and I am unsure how to change that globally. When measuring my calibration sphere with several probe angles my deviation from theoretical is identical so it is still very consistent.

[cmmguy]

Is it possible that what you are seeing is the "effective" diameter of the calibrated tip. It does not seem to be far off from the actual diameter.

The only other thing is to double check that your master ball diameter is set correctly.

[jacyEd]

I double checked the calibration sphere and its set at the correct size. Also the TP-200 using the same stylus and module pass qualification with no issues on the same ball. Repeatability is great with the 200b but it will not save probe calibration data unless the diameter is closer to theoretical. It seems as if either pcdmis or the probe interface is unable to compensate for the new deflection rate of the less sensitive probe.

[craiger_ny]

You can set the error threasholds in your probe utility. Would that be the right thing to do in this case?

Craig

[jacyEd]

I havent had much time to play with the 200B due to mu current workload but I am no closer to a solution to my issue. During calibration i find that every styli i try reads .001 smaller than actual and will fail calibration. Might this be a 3.7 MR3 issue? Anyone else around running a 200b by any chance?

[Wes Cisco]

I use a tp200. I considered a tp200b but my sales rep told me every one of those he has sold he ended up exchanging for tp200! FYI

I would not be too concerned about the that the size reads .001" small if it is consistant, and you can run the calibration routine as "qualification check" and it reports your sphere diameter correctly. If it is repeating and giving accurate readings, then like Craig suggested, up the tol in the calibration routine to accept what you are consistantly getting. HTH

[bob mappes]

just for kicks....try putting a mic on the stylus ball....maybe it IS .0778 in dia.

bob

[jacyEd]

just for kicks....try putting a mic on the stylus ball....maybe it IS .0778 in dia.

bob

Yeah that was one of the first things i tryed. It measures .0785 and its just about dead on what the TP200 measures. I just upgraded to the newest interfac.dll and find no change. I still measure exactly .001 small on all styli. I did what you guys suggested and actually and opened up the tolerance for probe diameter to pass calibration. I double checked my numbers using some recently calibrated set rings and its pretty much right on.