RE: [CAD_CAM_EDM_DRO] CNC Lathe threading

See my reply to James.
Yes indeed there are various methods of infeeding the threading tool.
Thanks for your info.
Dan

-----Original Message-----
From: Brian Pitt [mailto:bfp@...]
Sent: Monday, July 01, 2002 10:38 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] CNC Lathe threading

Hi Dan

most will automaticly adjust the start point of threading passes in
both X and Z to cut on the leading edge of the tool just like setting
the
compound over on a manual lathe
Okuma lathes for example have several types of thread cycle
leading edge,trailing ,alternating ,straight in ,etc.. depending on the
code
and params used to call out the threading cycle

Brian

> What I would like to hear from others that have machined threads on a
> cnc lathe is whether or not their controller automatically adjusts the
> path of the tool bit for the 29.5 degrees setting of the compound that
> you would have on a manual machine. I talked with a guy that I know

that

> owns his machine shop. He says that he doesn't compensate in his AH-HA
> software to take the compound setting into account. That since the

ah-ha

> software simply tracks encoder position he can take several passes

with

> feeding the cross slide only and get perfect threads. He did explain
> that you could write the G code to compensate for the lack of using a
> compound by offsetting the start position of each successive pass of

the

> threading tool by calculating it. The reason for the question is that
> some time in the future I want to eliminate the dyna controller and
> replace it with one of the low cost programs. I know that turbocnc

does

> threading and DeskWINNC is working on encoder feedback for lathe
> threading. So I was wondering if the lack of threading at a 29.5 D

angle

> was a problem but now that I have seen the dyna cuts thread I do think
> there is a problem.
> Dan

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