Re: Pipe tap depth question

I have purchased lots of 100 that came in boxes of 25. and those
parts did not all fit the same.

Goes to the old saying to measure twice....

CNC is great when you control all the parts.

--- In CAD_CAM_EDM_DRO@y..., Brian Pitt <bfp@e...> wrote:
> there are alot of places for the variations to add up ,for starters
not
> all pipe threads are the same there is the basic NPT then NPTF
(dryseal)
> then a whole range of others to meet different needs and they could
have
> used an NPSF (straight dryseal) tap to speed up production
>
> the parts may have been run on the high or low side on the guage or
the
> guage may have been worn ,or the "guage" could have been a sample
part
> from another run (this is more common than anyone likes to admit)
> or the machine could have been setup properly by the machinist but
then
> turned over to a minimum wage machine operator to run out the
> job (also common) I've seen the wage slaves run for most of a shift
with
> the tap missing half the teeth !
>
> this is all with production machines ,if you are doing one offs by
hand
> with no guages then you are prety much stuck with the old cut-n-try
> method and every part is a setup part :-)
>
> Brian
>
> > I am sure everyone has different experiences with this detail,
but I have
> > found that DIFFERENT small pipe-tap fittings (Bimba, Clippard,
> > hardware-store, auto-supply shop stuff, made in China, etc.) fit
to
> > DIFFERENT depths! So, if you want "perfect", you would have
to "hand-fit"
> > every single piece! I have never had to do more than "one or two
at a
> > time", so I can't say if ten pieces of same "make" bought on same
day would
> > "go to same depth", but I'd not BET on that!