Tight Tolerances

[[To...]]

Does anyone on the forum routinely measure tight tolerance diameters, i.e. 1.000 ±0.001 x 1.5 long? Yes, this is metric. What machine/sensor are you using? Are you able to get a 10% GR&R?

[[Is...]]

Precimar ULM (only length measurements),
the MPE is: ≤ (0,09 um + L/2000 mm)

The repeatability depends of the accessories that you use and/ or the method (between 0.05 um - 0.2 um)..Check also the environment requirements.

are distributed by MAHR, old versions are from ZEISS.
I use to have also a SIP ULM totally manual..

Some laboratories can improve the values, however the environment and method to achieve it are very strict.

[[Ke...]]

It has been a few years... and it was at an ISO 17025 lab: using a Zeiss UPMC in conjunction with a NIST certified Master.
I can't recall the smallest diameter; and I also cannot confirm the tightest tolerance... but that is the method that was defined & approved for measurements that could not be completed on the Precimar

[[Cl...]]

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Are you referring to 10% on a type-1, or a three operator type-2?

[[Is...]]

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GRR is always Type 2 and Cg (k), %AC, %EV is Type 1, or am i wrong?

[[Cl...]]

I saw the statement "Are you able to get a 10% GR&R?" and did not know exactly which type he was
referring to, so that prompted my question. We start always with a type-1 and we want <10% otherwise
historically anything >10% wouldn't pass a type-2.

Most of our customers require <30% on a type-2 study.