Pitch Problems - Bow/Twist

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  • Pitch Problems - Bow/Twist

    Afternoon, looking for some advice in regards to measuring a hole pitch of a bowed/twisted component in PC-Dmis. A 2D pitch is measured at a intermediate operation an gives us an nominal answer. We then measure when its in a fully machined condition (where there is a permissible element of bow/twist present in the component) and PC-Dmis reports an oversize pitched condition. The trend of the bow/twist suggests the pitch error if anything would report smaller in PC-Dmis (not greater in this case - consistent answer across batches). When the component is clamped down directly to eradicate the bow/twist it agrees with the intermediate operation (x nominal answer. Quindos (fully machined condition/same fixture/same orientation) also agrees the nominal answer. Please advise if possible. Thanks in advance.

  • #2
    measure that circle with a minimum of 8 hits and the correct pitch and 0,720 start/end angles. This will make Pcdmis go around twice and see it as a cylinder
    Originally posted by AndersI
    I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.


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