Re: [ATM] Need help with metric thread

[Richard <cnc@cncservo.co.uk>]

Hi Glen,

Tuesday, October 24, 2006, 4:15:05 AM, you wrote:

GY>   The male part will have a nominal diameter of 1.96 inches
GY> and will be threaded with 0.75 mm thread (thread depth
GY> 0.0185 inches).  My question is what should the nominal
GY> interior diameter of the female part be to assure a 70 percent thread engagement?

You don't say if you are threadcutting with a partial profile
insert (60 degree Vee) or a full ISO profile insert, but
according to the threadcutting calculator I wrote years ago, you
need a bore of 48.875mm. I'll finish the calculator off and
upload it if there's any interest. BTW, Metric threads normally
have an engagement of about 57% and a good rule of thumb for
bore or tapping drill is (Diameter - Pitch)

-- 

Best regards,
  Richard in the UK

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