Gage R&R on a Length Gage Made In-House

[jimmymustang06]

We have a length gage that we have made in-house. I'm not sure how it's made, but it has something to do with tight tolerance air cylinders that give constant positional feedback to a PLC... We've done a gage R&R and it comes out really good (R&R% = .059).. but I'm wondering how I'm going to calibrate it... From what I know, we're supposed to measure at various lengths that the gage is capable from. The problem is, it is capable of measuring any length we put in it.. Currently we have "setup bars" machined to close tolerance.. The gage is zeroed from the bars.. The PLC is programmed with the rules of spc and the gage is constantly monitored by the PLC.. if any of the rules are broken, the line is automatically shut down and the PLC displays the broken rule..

Is it as simple as using a couple "calibrated" gage bars?

[Stijloor]

A Quick Bump!

Can someone help Jimmy?

Thank you very much!!

[JAltmann]

It sounds like the setup bars are essentially masters for the air cylinder device. I would calibrate those internally or externally per your QMS requirements.

Those in turn are used to set the device. You'll probably need to write a procedure for the use of these in the setup of the machine. Probably set some intervals for the device to be set with those length bars and establish a tolerance that the device should be reading when it measures the bars.