[RP...] Posted May 29 Share Posted May 29 Recently we've had issues with one of our three Duramax CMMs reporting runout or concentricity 0.002 higher than the other two CMMs or concentricity gages. All the CMMs share the same programs, calypso 2021, and same probes. Measuring the sizes seems to be no issue. CAD Presentation outputs the same visual, on either side of the cylinder. Even after flipping the part. What could be the main causes? I've tried switching the fixtures. rotating the part. recleaning probes and the part. each machine is qualified only once a week. Any suggestions appreciated. I have a step cyl from recalling circles 1 and 2 for spacial, nothing in planar, x and z origins are step cyl. back plane is y origin. Link to comment https://qualityforum.zeiss.com/topic/26746-runoutconcentricity-issues-with-1-cmm-but-not-the-others/ Share on other sites More sharing options...
[Da...] Posted May 31 Share Posted May 31 Main cause that comes to mind is skewed scales due to a crash. Even seemingly harmless crashes can cause a machine to go out of spec. When was the last time the machine was serviced? 1 Link to comment https://qualityforum.zeiss.com/topic/26746-runoutconcentricity-issues-with-1-cmm-but-not-the-others/#findComment-151384 Share on other sites More sharing options...
[RP...] Posted June 1 Author Share Posted June 1 We had a technician calibrate the machine last month. Link to comment https://qualityforum.zeiss.com/topic/26746-runoutconcentricity-issues-with-1-cmm-but-not-the-others/#findComment-151394 Share on other sites More sharing options...
[RP...] Posted June 1 Author Share Posted June 1 It was aluminum build up. Replacing the probes seemed to have fixed the issue. 2 Link to comment https://qualityforum.zeiss.com/topic/26746-runoutconcentricity-issues-with-1-cmm-but-not-the-others/#findComment-151396 Share on other sites More sharing options...
[Jo...] Posted June 1 Share Posted June 1 Just thinking out loud: How can it be buildup, when you use the same probes and the same program on all machines? Or did you mean similar probes? Link to comment https://qualityforum.zeiss.com/topic/26746-runoutconcentricity-issues-with-1-cmm-but-not-the-others/#findComment-151398 Share on other sites More sharing options...
[RP...] Posted June 1 Author Share Posted June 1 Same program, similar probes. I'm just assuming that's what it was since the reports are now green and that's all the operators care about or understand. But that machine constantly checks aluminum parts that aren't checked on other machines because of the fixturing and space needed. I measured the probe on a keyence unit for the heck of it. The ruby seems to be .002 off the center of the shaft? Maybe it did crash and nudged the probe out of place? I didn't think the position of the ruby mattered. The dark green lines are from the high and low points of the ruby while rotating in 30 degree increments. The longer dark green line is the average of the 12 lines. Looks like theres a pattern, but I can't figure out if it's significant to anything. Link to comment https://qualityforum.zeiss.com/topic/26746-runoutconcentricity-issues-with-1-cmm-but-not-the-others/#findComment-151400 Share on other sites More sharing options...
[Ri...] Posted June 1 Share Posted June 1 A probe qualification should have taken care of this. If you are measuring aluminum, I would advise strongly against using ruby. 1 Link to comment https://qualityforum.zeiss.com/topic/26746-runoutconcentricity-issues-with-1-cmm-but-not-the-others/#findComment-151404 Share on other sites More sharing options...
[RP...] Posted June 1 Author Share Posted June 1 Please sign in to view this quote. I agree. If we had more space on the duramaxs, I'd put a nitrade stylus system on them for the aluminum parts. I've told our higher ups about that too. Link to comment https://qualityforum.zeiss.com/topic/26746-runoutconcentricity-issues-with-1-cmm-but-not-the-others/#findComment-151408 Share on other sites More sharing options...
[Za...] Posted June 15 Share Posted June 15 Please sign in to view this quote. Here is a Zeiss resource on the topic of probe types: The Styli Handbook https://portal.zeiss.com/knowledge-base?id=1113662 Link to comment https://qualityforum.zeiss.com/topic/26746-runoutconcentricity-issues-with-1-cmm-but-not-the-others/#findComment-151811 Share on other sites More sharing options...
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