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Thread: ACME thread

  1. #1
    Join Date
    Dec 2004
    Location
    Up North
    Posts
    28

    Question ACME thread

    How do I explain an ACME thread count?
    My lead screw is 0.5" 8tpi 2 start.
    Is that the correct way or do I divide by 2 to get 0.5" 4tpi 2 start?
    TIA
    Every day is better than yesterday

    Cheers
    SAISAY

  2. #2
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    5,630

    Default

    So the pitch is 1/8" but the lead is 1/4"?
    Gold, the colour of choice for the discerning man.

  3. #3
    Join Date
    Apr 2013
    Location
    Toowoomba Qld
    Posts
    351

    Default

    My understanding is you describe it as the total threads per inch x how many starts
    So while a 8tpi 2 start thread is really 2 x 4tpi threads side by side, they are cut using a 8tpi thread form / depth and the total thread count would be 8tpi

    I may of course be incorrect as this is only my understanding of it.

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