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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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  • 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?



    Look, I have been reading your posts on this forum for years and I know you generally know what you write about but this time I disagree.

    Discussions like this are exactly why we have standards in this business. If the equipment is sold with a specification and no longer meets said specification, its not only “not accurate enough”, its out of spec. The standards are designed so that the give end users the ability to prove that their equipment works, not some arbitrary engineers guess at what is important.

    You list 0 experience actually measuring anything yourself with an arm. I don’t care what some sales guy at a demo did or what other people did that you heard about. If I don’t measure it myself, with equipment I know meets its spec, I’m skeptical and I absolutely would not advise someone on a forum without that experience.

    And yes, I do work for a large metrology company that makes equipment such as stationary automated CMMs, arms and trackers that are all certified to standards such as ASME B89.4.22. I have used them all in “real world applications” and I know what they CAN do, not just from measuring things but because of the standards.
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  • 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?



    Look, I have been reading your posts on this forum for years and I know you generally know what you write about but this time I disagree.

    Discussions like this are exactly why we have standards in this business. If the equipment is sold with a specification and no longer meets said specification, its not only “not accurate enough”, its out of spec. The standards are designed so that the give end users the ability to prove that their equipment works, not some arbitrary engineers guess at what is important.

    You list 0 experience actually measuring anything yourself with an arm. I don’t care what some sales guy at a demo did or what other people did that you heard about. If I don’t measure it myself, with equipment I know meets its spec, I’m skeptical and I absolutely would not advise someone on a forum without that experience.

    And yes, I do work for a large metrology company that makes equipment such as stationary automated CMMs, arms and trackers that are all certified to standards such as ASME B89.4.22. I have used them all in “real world applications” and I know what they CAN do, not just from measuring things but because of the standards.
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