Re: [CAD_CAM_EDM_DRO] Re: Using a tapping attachment with a CNC bore cycle

On Fri, 15 Feb 2002 19:09:36 -0000, "doug98105"
<dougrasmussen@...> wrote:

>I have several Tapmatics among other tapping heads. I have yet to
>see any of them that'll tap as large a hole as they're rated. My
>1/2" capacity units are good for 3/8"-16 on a good day, maybe. Keep
>us posted on how well yours function.

Which models?

I think the model may be important in the selection process. The nnX
series have torque limiters. So do some others. They appear to be for
drill presses and other machines that have a manual feed.

The NCR (1.5X reverse rpm) and SPD (1:1X reverse rpm) series heads have
no "intentional" torque limiters. They do have directional clutches but
no torque setting. I shopped for versions that had no torque limiter
since I intend to use them with a CNC machine.

Having said that, I have said every thing I know about it! <G>

>BTW, for you and others....try to get a copy of the Greenfield Screw
>Thread Manual. Gives an easy to read listing of the common inch
>threads up through 1". Tap drill sizes are listed by length of
>thread engagement and by percentage of thread. They used to give
>them away at trade shows, last I heard they were $10 (well worth it).

I tried www.greenfield.com and got Greenfield-online - that doesn't seem
to be the right place. Does the publisher of this handy little manual
have a WEB page perhaps?

Thanks
Fitch