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  1. Tizbass

    Perpendicularity to a pitch diameter

    I need some info on how to measure this properly. The feature is a spot-face with a M14 x 1.5 -6H Rolled thread (oil drain plug) The feature control frame Perp. 0.15 to Datum D is on the spot face. It is also a critical characteristic requiring SPC. D is the pitch diameter of the thread. Do I...
  2. Tizbass

    Flatness call-out

    Yes it does help...Thanks. We were trying to hold a flatness of 0.1 over the entire surface which I don't think we needed to do.
  3. Tizbass

    Flatness call-out

    I have a question about a Flatness feature control frame on a part drawing. The surface machined surface is approx 300MM x 700MM Profile 0.75 X Profile 0.5 - freestate Flatness 0.1/ 75 x75 Max overlap 3MM Min overlap 1MM I'm good with most of it but Ive never seen the 75 x75 called out...

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