RE: [CAD_CAM_EDM_DRO] Re: Feed hold with G-Codes

Thanks Fred,

That answered my questions.

BTW, here's a couple of links to photos of the Electronic Leadscrew cut
tapers. MT1 and MT2.

http://www.pacificsun.ca/~john/ELS/MT-1_taper.jpg

http://www.pacificsun.ca/~john/ELS/T0.04988.jpg

Roughness of Gingery Lathe not withstanding, they fit perfect the first
time. Granted this can be done with the MACH or TurboCNC etc. but this is
the stand-alone unit.


John Dammeyer


Wireless CAN with the CANRF module now available.
http://www.autoartisans.com/products
Automation Artisans Inc.
Ph. 1 250 544 4950

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Fred Smith
> Sent: Thursday, December 21, 2006 1:10 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: Feed hold with G-Codes
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, John Dammeyer
> <johnd@...> wrote:
> >
> > Hi,
> > For the various CNC systems out there, how do they handle feed hold
> while
> > threading on a lathe?
> >
> > Say you specify that the system should do the thread in 12 passes.
> If you
> > feed hold after the sixth pass, and the restart, does it restart at
> the
> > beginning and just turn empty air until it reaches where it
> stopped?
> Or
> > does it continue where it left off. I'm assuming threading
> here with
> the
> > single line G-Code. I've always assumed that Feed Hold stops on G-
> Codes and
> > not in the middle.
>
>
> Except for threading and synchronized tapping cycles, feed hold stops
> all slide motion. For threading and tapping commands, feed hold is
> effected upon completion of the current line of either G-code
> ( ie G33,
> G84, etc). Stopping the spindle during either operation
> "should" stop
> slide motion.
>
> If you have a multiple pass threading process, restarting a program
> after interrupting in the middle should cut air until the
> previous last
> pass completed is repeated, then cutting should resume as if
> it was the
> original run.
>
> In the past some controllers have permitted feed-rate override to be
> used during threading cycles. This is usually excluded as the thread
> pitch is messed up, however, I have seen some VERY expensive
> CNC lathes
> that would not correctly repeat the cut if feed rate override
> was used
> between threading cycles.
>
> Fred Smith - IMService
> http://www.imsrv.com
>
>
>
>
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