metric tapping

[fourperf]

Hi guys, could someone please inform me on the formula to figure out the Q value for a metric tap (5mm 0.8) for a compression tapping cycle.

thanks

mark

[gsrmmeza]

This is out of the Fadal manual:

How to compute the Q value for tapping cycles:

Inch mode: Divide 1 by the threads per inch. Example:1/4-20 tap 1/20=.05

Metric mode: Multiply .03937 by the lead. Example: 8mm x 1.25 tap (1.25 is
the lead): .03937 X 1.25= .0492. This will be the inch equivalent for the lead.

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When I convert metric to inch I will take the pitch and divide by 25.4

Using the above example 1.25/25.4=.0492

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So if i wanted to convert 5mm x .8 I would divide .8 by 25.4
example: .8/25.4=.0315

[fourperf]

thanks a lot.

mark