Re: [CAD_CAM_EDM_DRO] Pipe tap depth question

Hi All:
I use the cut and try method too.
I've found that the fittings often differ from batch to batch.
Pipe plugs have the same problem.
I don't think there is a reliable way other than cut and try.
After all, that's how the gauge seems to work too.
Cheers

Marcus

----- Original Message -----
From: "Brian Pitt" <bfp@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, July 28, 2002 1:10 PM
Subject: 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
>
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