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

On Mon, 2003-10-20 at 11:06, doug98105 wrote:

> Kim,
>
> Spindle coasting isn't much of a problem on coarse threads since you
> have the torque of the tap acting as a spindle brake. It's the 10-
> 32's and smaller where there's very little torque involved.

Good point. Like I said, I haven't done it, yet anyway.

> Yes, a 10tpi doesn't have much room to coast with a tension holder,
> but I don't think you'll be able to tap the coarse pitches like that
> anyway. Check the tapping capacity of commercial machines sometime,
> it's always smaller than you'd expect based on the spindle hp.

We'll thread mill the big threads anyway. I'd just love to CNC the
1/4-1/2" threads. That is where most of ours lie.

> Another type of tap holder I use in the CNC lathes is a releasing
> type, once the depth is reached and feed stops the tap self feeds
> slightly more and then spins freely. By reversing the spindle the
> mechanism catches again and screws the tap out. These have a
> slightly less axial movement than the usual tension/compression
> type. I'm not sure if these work in a mill where the holder is
> rotating as opposed to the lathe where the holder is stationary.

Can you recommend a brand of these ?

> Doug
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@..., timg@...
> Moderator: pentam@... indigo_red@... [Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

--
Kim Lux <lux@...>