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  1. #1
    Join Date
    Jan 2007
    Posts
    56

    rigi tapping feed speed equasion?

    hello all im getting ready to do some rigid tapping but i cant seem to rember or find the equasion to find the corosponding F (feed) and what the S (rpm )should be t tap with my 1/4 20 thanks for your help ahead of time:rainfro:

  2. #2
    Join Date
    Oct 2008
    Posts
    13
    I think the formula is F(feed rate)=S(spindle RPM) * Pitch

  3. #3
    Join Date
    Jul 2005
    Posts
    12177
    Quote Originally Posted by Bikov View Post
    I think the formula is F(feed rate)=S(spindle RPM) * Pitch
    Correct; 20 tpi is 0.05" x rpm; if you use 1000 rpm the feed is 50.0fpm, if you use feed per rev the feed is 0.05 no matter what the rpm.
    An open mind is a virtue...so long as all the common sense has not leaked out.

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