Re: [CAD_CAM_EDM_DRO] Re: G76 format?

On production machines the one or two line codes depends on the type of
control I:E: one line 10t/11t/15t, two line 0t/16t/18t/ these are Fanuc
control numbers.

Paul

----- Original Message -----
From: <dkowalcz@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, December 29, 2002 11:57 PM
Subject: [CAD_CAM_EDM_DRO] Re: G76 format?


> Thanks Andrew!
>
> So, that's the two line form, eh? Neat. Thanks for taking the
> time to look it up and post it.
>
> Questions: Are Q, R, I, and the second P always in the implied
> decimal format? Since Z, X, and F are decimalized, it seems kind of
> strange to mix the two in the same code - doubly so since retrofits
> have all kinds of different resolutions.
>
> I'm a bit unclear the effect of the chamfering amount in the second
> two chars of the P word. Is the thread chamfered with the threading
> tool explicitly by the G76 cycle? Seems like one would want to to
> this with another tool, but I guess it could be pretty convenient
> though as part of the threading action. Or is this just "stay out"
> information so the cycle can be optimized?
>
> Don, if you want to post the one line form online it'd probably be
> appreciated by the group members as well. Although I've begun back-
> decoding it from the Gcode made by Lathe Quick Code (thanks to Fred
> from imserv), it'd be very helpful to have a specification to start
> from. Bad form to rely on others' programming to enforce a standard -
> even though that's exactly how it happens in the real world!
>
> I think I might end up supporting both with a global dialect option
> for 2 line vs 1 line G76 forms, since no doubt both will have their
> adherents.
>
> Thanks again. This helps immensely.
>
> Dave Kowalczyk
> Everett WA
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Andrew Erwood" <a_k@a...>
> wrote:
> > Hi Donald and Dave,
> >
> > Here is the definition of G76.
> >
> > G76P(m)(r)(a) Q(d min) R(d);
> > G76X_ Z_ R(i) P(k) Q(dd) F(l);
> >
> > m = Number of finishing cuts
> > r = Chamfering amount
> > a = Angle of tool tip
> > d min = Minimum cutting depth (specified in radius value)
> > d = Finishing allowance (in radius value)
> >
> > X = X axis destination
> > Z = Z axis destination
> > i = Taper value (in radius value)
> > k = Height of thread (in radius value)
> > dd= Depth of first cut (in radius value)
> > l = Lead of thread
> >
> > For example:
> > G76 P010060 Q100 R200;
> > G76 X60.64 Z-25. P3680 Q1800 F6.;
> >
> > This code cuts a thread with one finishing cut, no chamfer on the
> exit of
> > the tool, with a tool tip angle of 60deg. It will have a minimim
> depth of
> > cut of .1mm and will have a finishing allowance of .2mm. The minor
> diameter
> > of the thread is 60.64mm and it will cut a thread 25mm long in the
> Z minus
> > direction. The height of the thread is 3.68mm and the depth of the
> fist cut
> > is 1.8mm and the thread has a lead of 6mm. This thread is a
> straight thread
> > with no taper.
> > As a general rule of thumb, on a 1.5mm pitch thread I would have
> approx 12
> > passes to complete the thread with a full form insert and I run
> about 250
> > meters/minute cutting speed. At this speed I get VERY good tool
> life.
> >
> > Hope this helps.
> >
> > Regards
> > Andrew
> >
> >
> > -----Original Message-----
> > From: Donald Brock <don.pat.brock@p...> <don.pat.brock@p...>
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Date: Monday, December 30, 2002 8:46 AM
> > Subject: [CAD_CAM_EDM_DRO] Re: G76 format?
> >
> >
> > >Dave,
> > >
> > >I'd like to help with this also. I'll post another responce to this
> > >monday evening when I have my manuals/notebooks in hand. Let me
> know
> > >if you prefer a group or off line responce.
> > >
> > >I'm totally in favor of the fanuc method which does the g-76
> (canned
> > >cycle) multipass threading (both tapered and straight)with a single
> > >line of code versus the the two line command canned cycle as used
> on
> > >the mitsubishi and others. They are basically the same just
> different
> > >methods of entering the varibles for the macros.
> > >
> > >I may have a print out of the mitsubishi g-76 macro somewhere. I'm
> in
> > >the middle of changing isp's so my e-mail address may not be valid
> if
> > >you try to respond off line.
> > >
> > >Donald Brock
> > >
> > >> Anyone know what the defacto-standard is for G76 canned cycle
> > >> threading these days? I'd like to implement this in my control,
> > >and
> > >> as you all know, we're not exactly short of variety in G codes.
> > >>
> > >> Thanks.
> > >>
> > >> Dave Kowalczyk
> > >> Everett WA
> > >> Author of TurboCNC --> http://www.dakeng.com/turbo.html
> > >
> > >
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> 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/
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>