Re: [CAD_CAM_EDM_DRO] Re: Pipe tap depth question

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!