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Knurl pitch: in industry, how specific are knurling spec's on print

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  • Rich Carlstedt
    replied
    All the above are correct
    Knurling is a non-precision operation and as such few 'controls" are of value

    When precision is required, a "Machine cut" pattern is spelled out and then you use a (powered) indexer and milling cutter. Fortunitly, This is seldom !
    Such a call out gives ID, OD, pitch ,LOC, Cutter Profile to use, and sometimes the sharp edge radius (!)
    As such, the only drawing I can recall was for steel drive roller which fed oily steel blanks into a punch press. It looked like a simple knurl, but the dimensions were tightly controlled, and the profile had a Buttress thread appearance

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  • ckalley
    replied
    We have parts where I work now that are knurled. On the drawings they call out the pitch of the knurl and the style - "25 pitch straight knurl" for example. Also, we have some parts that are knurled for a press fit and they also have a tolerance on the OD after knurling.

    Other places, that were less 'formal', would just call out something like 'medium diamond knurl'.

    Craig

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  • TGTool
    replied
    We always just called out "knurl" and let the toolmakers apply whatever they thought worked best. I never saw anything more specific on any tool drawings I ever encountered.

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  • Arthur.Marks
    replied
    To clarify: which is standard practice?

    * Diamond Knurl, medium pitch
    * Diamond Knurl, 30tpi

    In other words, calling out "medium pitch" allows you to use a range of similar pitches, whereas the latter specifies an exact pitch to use.
    Last edited by Arthur.Marks; 08-31-2010, 01:52 PM.

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  • Knurl pitch: in industry, how specific are knurling spec's on print

    For those with industry experience:

    How specific is "standard practice" WRT knurls. How many prints call out a specific pitch figure---and not just diamond, straight or cross?
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