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NC Pros and Cons

acgarcia
Looking to get into PC-Dmis NC. We currently use Renishaw touch probes to locate parts. Never used them for actual measurements.

Some info:

I'm a CMM guy, not a machinist, is that a problem for NC?
The machinists we do have tend to crash the machines a lot.
Trying to reduce or eliminate human qc steps.
Make small and large parts for oil and gas industry.
Tightest tolerance would be 0.0005in.
Mostly steel, some brass and aluminium.
Machines are Haas mills and Mori multi turning centers. Mori Lathes, 1 Toshiba large boring mill.
Don't know if I need 3, 4 or 5 axis NC Options.
What if I what a singe probe and a star probe?

I got some info from our sales person but I'm still looking for other info. Seems to be cheaper than buying another CMM. We are buying new CNC mulit turning centers like ever other month now. Most of which have tooling carousels with plenty of free space. One purchase came with a renishaw probe that uses radio frequencies. A mori person was here setting it up to locate the part. I asked her about actual measurements and reporting but she didn't know about that side of it.

Any advice or input would be appreciated.
Parents
  • NC-DMIS is literally PC-DMIS. If you know how to do something in PC-DMIS, you can do it for NC-DMIS assuming the CNC machine is capable of doing it.

    On the CNC machine, if you want to use different "tip angles" on a 5 axis machine, you must rotate the part to the probe, instead of the probe to the part.

    For starting alignments, instead of using "STARTUP" you will use "G55" or "G54" (I think that's what it as. This was on Haas VMCs with 5 axis trunions).

    Don't listen to Hexagon, you better have your machines calibrated (especially if you are ISO). That's absurd to assert that they don't require it. Especially with 5 axis trunions. I'm struggling to remember who we used as our machine calibration service, I want to say it was "Lasers Inc".

    You will definitely want to prove any part program by verifying it on the CMM, for at least as long as it takes to build trust in the results. We were required, by our customer (DoD mainly) to match 1 for 1 NC versus CMM for something like the first 20 pieces, and then critical features only for the next 20 pieces, and then once every whatever number of pieces. And if anything ever mismatched (CNC says good, part not CMMed, failed in the field) then we would have to start over. YMMV.

    Also, it's been nearly 6 years since I worked around NC-DMIS, so my recollection may be fuzzy, or no longer relevant. Slight smile
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  • NC-DMIS is literally PC-DMIS. If you know how to do something in PC-DMIS, you can do it for NC-DMIS assuming the CNC machine is capable of doing it.

    On the CNC machine, if you want to use different "tip angles" on a 5 axis machine, you must rotate the part to the probe, instead of the probe to the part.

    For starting alignments, instead of using "STARTUP" you will use "G55" or "G54" (I think that's what it as. This was on Haas VMCs with 5 axis trunions).

    Don't listen to Hexagon, you better have your machines calibrated (especially if you are ISO). That's absurd to assert that they don't require it. Especially with 5 axis trunions. I'm struggling to remember who we used as our machine calibration service, I want to say it was "Lasers Inc".

    You will definitely want to prove any part program by verifying it on the CMM, for at least as long as it takes to build trust in the results. We were required, by our customer (DoD mainly) to match 1 for 1 NC versus CMM for something like the first 20 pieces, and then critical features only for the next 20 pieces, and then once every whatever number of pieces. And if anything ever mismatched (CNC says good, part not CMMed, failed in the field) then we would have to start over. YMMV.

    Also, it's been nearly 6 years since I worked around NC-DMIS, so my recollection may be fuzzy, or no longer relevant. Slight smile
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