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Looking for new portable CMM

Nguyen
Hi all,
I'm looking for a portable CMM and found some Romers but not sure which one is best fit my need. I need a touch probe CMM, (PC-DMIS software preferred) to measure the mold/die feature mounted on the machine. Accuracy about 0.0002", arm is able to reach 40". I already submit a request to Romer but still want to ask your opinion on any pros and cons of the portable CMM? What machine type you have or suggest, etc...
Currently we have to disassemble the mold/die to put on the CMM to meaaure so I'd liek to avoid that.
Thank you in advance.
Nguyen
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  • I'm not sure what equipment your PCMM experience was with but arms are certified to standards just like stationary CMMs. The volumetric accuracy of a 1.2 meter Infinite 2.0 is +- .0006”, so obviously not better than .0002”, but it is that accurate when evaluated by the ASME B89.4.22.


    That may be, but I am not intersted in B89.4.22 results when in real world applications +/-.010 is what you get.

    We had a salesperson bring an arm out for a demo. I presented a part that simplified was a block with a tab sticking out one side. There was a hole in the tab. The Datums were the pretty obvious 3 mutually perp planes. I wanted to know how well the arm could report the location of the hole and the thickness of the tab. Both had been measured several times by myself and 3 others using CMM, microhite, a micrometers (for the thickness.). I asked for thickness first, they could not get closer than .008 to the actual thickness and their repeatability was equally horrid. I did not even bother asking for position after that.

    That is the extent of my personal arm experience, but I have conversed with many who use arms and CMMs for a variety of applications.

    Arms are great for some things. They can do what they can do. Tight tolerances they can not do.

    Oh, and I have not even gotten to the numerous reports of frequent encoder failure & costly replacement (In terms of both $ and downtime).

    Lastly in the interest of full disclosure, do you work for an arm company or a division of a company that makes sells arms or arm software?
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  • I'm not sure what equipment your PCMM experience was with but arms are certified to standards just like stationary CMMs. The volumetric accuracy of a 1.2 meter Infinite 2.0 is +- .0006”, so obviously not better than .0002”, but it is that accurate when evaluated by the ASME B89.4.22.


    That may be, but I am not intersted in B89.4.22 results when in real world applications +/-.010 is what you get.

    We had a salesperson bring an arm out for a demo. I presented a part that simplified was a block with a tab sticking out one side. There was a hole in the tab. The Datums were the pretty obvious 3 mutually perp planes. I wanted to know how well the arm could report the location of the hole and the thickness of the tab. Both had been measured several times by myself and 3 others using CMM, microhite, a micrometers (for the thickness.). I asked for thickness first, they could not get closer than .008 to the actual thickness and their repeatability was equally horrid. I did not even bother asking for position after that.

    That is the extent of my personal arm experience, but I have conversed with many who use arms and CMMs for a variety of applications.

    Arms are great for some things. They can do what they can do. Tight tolerances they can not do.

    Oh, and I have not even gotten to the numerous reports of frequent encoder failure & costly replacement (In terms of both $ and downtime).

    Lastly in the interest of full disclosure, do you work for an arm company or a division of a company that makes sells arms or arm software?
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