Re: Speed of Tapping Head?

I double checked today and I run 1/8 npt, these are close to the size
of a 1/2 inch tap, but are tapered so are harder to tap. I run those
at 650 rpm.

I run 1/4-20 and 10-32 at 1,000 rpm. With the Procunier, the tap
pulls itself into the material, and Either the drill press hits a
stop I set up, or I chose to stop the forward motion and have the tap
reverse. I like the slower speeds as I can stop it a little more
precicely.

I can not imagine taping at 60 RPM. no need to go that slow, and
besides my drill press slow speed is closer to 250 RPM.

Dave

--- In CAD_CAM_EDM_DRO@y..., "doug98105" <dougrasmussen@c...> wrote:
> Peter,
>
> I have a lead screw (actually change gears) tapping machine. Looks
> very much like a drill press. Capacity is 5/16". It came from the
> factory with only has two speeds, 1000 & 2000 rpm.
>
> One important factor about tapping speed is whether you are
depending
> on the tap to pull itself into the material and determine it's own
> lead (like using a drill press tapping attachment) or whether the
> machine somehow determines the lead. The difference being when the
> lead is determined by the machine, not so much load is on the tap
and
> much, much higher speeds are possible. Rigid tapping on CNC
> machining centers typically run up to 5000rpm!!
>
> With my tapping machine I mostly use the 1000rpm speed, but for
> anything about 32 tpi or finer pitch I'll use 2000rpm. We very
> seldom break a tap, and when we do it's not because of the speed.
>
> I think your 30 to 60 rpm is much too slow. That can be almost as
> bad as too fast.
>
> Doug
>
>
>
>
>
>
>
> --- In CAD_CAM_EDM_DRO@y..., "Peter Homann" <peter.homann@a...>
wrote:
> > Hi Dave,
> >
> > Thanks for the reply. Surely the 2000rpm is for the input spindle
> of the
> > tapping head? Is the tap turning that fast, or is it geared down
by
> the
> > tapping head. I was expecting something like 30- 60 rpm.
> >
> > Thanks
> >
> > Peter Homann
> > <mailto:peter.homann@a...>
> > Work : +61 3 8530-7755
> > Adacel Technologies Ltd Fax : +61 3
9596-
> 2960
> > 250 Bay St, Brighton 3186, VIC, AUSTRALIA Mobile : 0421
> 601665
> > http://www.adacel.com.au Australian Software Engineering
> Excellence
> >
> >
> > > -----Original Message-----
> > > From: turbulatordude [mailto:davemucha@j...]
> > > Sent: Friday, 26 July 2002 9:12 PM
> > > To: CAD_CAM_EDM_DRO@y...
> > > Subject: [CAD_CAM_EDM_DRO] Re: Speed of Tapping Head?
> > >
> > >
> > > My Procunier manual says that for my #1 tapping head, that
3,000
> RPM
> > > is the maximum tapping speed. This one handles up to a 1/4
inch
> tap
> > > in aluminum, or an 8mm threadforming tap.
> > >
> > > the maximum for my #2 head is 2,000 RPM. and that one handles
up
> to
> > > a 1/2 inch tap in aluminum.
> > >
> > > I usualy tap at much lower speeds (500 rpm) (thank goodnes that
> there
> > > are no metric time units to convert) as I think tap life would
be
> > > increased and since I am not a production shop, tap life is way
> more
> > > important than speed of making a part. Also since I usually
tap
> at
> > > 1/4 in in aluminum on the #1 and 1/8npt on the #2.
> > >
> > > If you wanted to figure out exactly the most desirable maximum
> speed
> > > for your part, figure the tap circumference to determine sfpm
of
> the
> > > cutter. Then you can look up the metal you are tapping and
figure
> > > the cutting speed. Kind of like figuring lathe rpm by surface
> feet
> > > per minute. Then with the tap material, probably HSS, you can
> locate
> > > the best cutting speed SFPM.
> > >
> > > and remember to keep the taps well lubricated. probably the
> single
> > > biggest thing to keep tap life.
> > >
> > > Hope that helps.
> > >
> > > Dave
> > >
> > >
> > >
> > > --- In CAD_CAM_EDM_DRO@y..., "Peter Homann" <peter.homann@a...>
> wrote:
> > > > Hi,
> > > >
> > > > I'm looking at constructing a small electronic tapping head
for
> my
> > > Taig CNC
> > > > Mill. By electronic, I mean that the tapping head will be
> driven by
> > > a small
> > > > 12 dc motor geared down to an appropriate speed. The
direction
> will
> > > be
> > > > controlled by micro switches and possibly a PIC
microprocessor.
> > > >
> > > > The tapping head is to tap up to 6mm (1/4"), and if I can
8mm.
> My
> > > question
> > > > is:
> > > >
> > > > What is an appropriate speed for a tapping head?
> > > >
> > > > Thanks in advance.
> > > >
> > > > Peter Homann
> > > > <mailto:peter.homann@a...>
> > > > Work : +61 3 8530-7755
> > > > Adacel Technologies Ltd Fax : +61 3
> 9596-
> > > 2960
> > > > 250 Bay St, Brighton 3186, VIC, AUSTRALIA Mobile :
0421
> > > 601665
> > > > http://www.adacel.com.au Australian Software Engineering
> > > Excellence
> > >
> > >
> > > Addresses:
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