Re: [CAD_CAM_EDM_DRO] Pipe tap depth question

in production we use a tapered thread plug guage ,its got a step ground
in at the right depth so you can screw it in and the step should be flush
with end of the part (+/- 1 turn)

you could make your own (non-precision) guage from some extra fittings
by screwing them together handtight and filing a step where they meet
or shooting it with a bit of spraypaint ,shoot the tap at depth as well

also the Machinery's Handbook has some tables that list the length for
handtight engagement and the minor diameter at that length
(its spread over several pages) so you could measure how far a guage pin
drops in

HTH
Brian

On Sunday 28 July 2002 01:49, you wrote:
> All of this talk about taps and tapping speed reminded me of a
> problem i always have when trying to use a pipe tap.
>
> How do you know how far to thread a pipe tap into the workpiece for
> proper pipe fit. I usally tap a few turns then take the tap out and
> try the tapped hole with a pipe fitting, then tap another turn or 2
> and test again.
>
> This process is slow and sometimes i tap to far. There must be a
> better way....
>
> WallyK