Re: [CAD_CAM_EDM_DRO] Re: Rigid Tapping--How is this accomplished?

That makes perfect sense. Thanks for the reply !

I knew there were spiral taps and I knew they were used in production
tapping, but I didn't realize that they broke/cleared the chips
differently.

I see that Enco sells fiarly economical spiral point/spiral taps. Are
they any good ? Does anyone know of where I could buy a whole set of
spiral taps, ie at "set" discounted prices ?

I wish I would have known this prior to buying our hand taps.

Kim

On Mon, 2003-10-20 at 09:42, jmkasunich wrote:
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Kim Lux <lux@d...> wrote:
> > The thing I don't understand about this setup is how the
> > tap can totally cut the thread without breaking. For
> > example, if I am cutting a thread by hand, I must
> > advance/reverse the tap 25 times to reach the bottom of
> > the hole without breaking the tap. How could a milling
> > machine power the tap right to the bottom of the hole
> > without reversing the tap ?
> > Won't it break the tap ?
>
> You just have to use the right taps <g>!
>
> The traditional straight flute tap is known as a hand tap,
> and you are right - you must reverse it frequently to clear
> chips.
>
> Machine tapping is done with either spiral point taps (aka
> gun taps), or with spiral flute taps. Get out your favorite
> tooling catalog and look at the pictures to see the difference.
>
> Gun taps push the chip forward into the hole. They work very
> well on thru holes, because the chip has someplace to go.
>
> Spiral flute taps pull the chip back, like a twist drill.
> They are much weaker than gun taps, and as the hole gets
> deeper the chip will still tend to get stuck. But for shallow
> blind holes they are the right choice.
>
> IMHO buying hand taps is a waste of money - even for hand
> work, I'd much rather use a gun tap.
>
> Summary:
>
> Gun tap (spiral point): best overall, but can't use on
> shallow blind holes.
>
> Spiral flute tap: good for blind holes
>
> Hand tap: I'll take them if they're free and a size I don't
> have...
>
> YMMV
>
> John Kasunich
>
>
>
>
>
>
>
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Kim Lux <lux@...>