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Programing with Romer Arm

WolfMan
I have a few questions about programming with Romer. I have never used it before and was wondering is programming any different from CMM or anything I need to know bedsides its accuracy and repeatability.

So my first q. is Do I need a DCC Alignm. ?

How do i go about locking an Axis, say I need to measure something At X0 Y0, how do I do it with Romer?

Any additional Information info. is appreciated.
  • DCC stands for Direct Computer Control. Unless you are a robot, everything you do is in manual mode. And being a human, you (as I) are incapable of the precise, repeatable motion of a DCC CMM. This should be taken into account. You can only get out of it, what you put into it, (or Garbage in, Garbage out).

    Especially with the Romer Arm, you have no idea where the part is in the system without an initial alignment. So, if you don't have an initial alignment, you are starting with a part that could be anywhere, using a machine that accounts for its physical orientation to determine vector and probe comp, and then inserting the human component. I think it is even more imperative with an arm that you have an initial and refine alignment.
  • If i were to measure a thread, you said that i can use one click method, do i select circle first or do i just click it and it will lnow dia size?

    I haven't used PC-DMIS with the arm for some time now. I think it is a selection when creating a circle, to make it a single point. That part I don't completely remember. It uses your sample hits, and determines where the probe sphere intersects the plane.
  • With romer every feature is done manually, so why would it be DCC? I dont inderstand. With cmm yeah it makes sense to have manual algn and dcc but with romer if the align is to the print why do i need 2 of them?
  • DCC stands for Direct Computer Control. Unless you are a robot, everything you do is in manual mode. And being a human, you (as I) are incapable of the precise, repeatable motion of a DCC CMM. This should be taken into account. You can only get out of it, what you put into it, (or Garbage in, Garbage out).

    Especially with the Romer Arm, you have no idea where the part is in the system without an initial alignment. So, if you don't have an initial alignment, you are starting with a part that could be anywhere, using a machine that accounts for its physical orientation to determine vector and probe comp, and then inserting the human component. I think it is even more imperative with an arm that you have an initial and refine alignment.
    I understand that i need manual align, what i dont get is why do i need another alignment if it uses the same datums.
    If i have a simple block plane line line, why do i need 2 align, iys not like the romer will measure it on its own lile cmm does
  • I understand that i need manual align, what i dont get is why do i need another alignment if it uses the same datums.
    If i have a simple block plane line line, why do i need 2 align, iys not like the romer will measure it on its own lile cmm does

    The first is the rough or coarse alignment, the probe comp isn't very accurate, in the second alignment you should use auto plane & auto trigger for better probe comp , lower cosine error and hence a more reliable alignment, just like DCC alignments.
  • Cant Auto plane and auto cirl be used in the Manual align?

    What is Auto Plane and auto triger?
  • Wolfman, please read pages 41~47 from the PC-DMIS portable manual and you will have a better understanding on how to measure correctly with the Romer arm, you can get it here:

    ftp://ftp.wilcoxassoc.com/docs/v2014manual/eng_pcdmis_2014_portable_manual.zip

    HTH Stuck out tongue closed eyesSlight smile
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