Re: [CAD_CAM_EDM_DRO] Re: G76 format?

Two 0t/16t/18t controls One line 10t/11t/15t controls
(Fanuc)

Paul


Message -----
From: "Andrew Erwood" <a_k@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, December 08, 2002 11:13 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: G76 format?

> Hi Dave,
>
> OK this 'version' of G76 is of the Fanuc 0TC control variety, There are
> possibly other versions around, I am not sure. I have 3 lathes with Fanuc
> 0TC controls of varying ages, the newest is 1997 vintage, all three

machines

> use the same G76 implementation. I also have an Okuma lathe with an
> OSP5000LG control and this uses a single line of G71 for threading, I can
> send this if you wish.
>
> Yes for some reason Q,R,I and the 2nd P are as I put in the example, I

don't

> know why but as I said all three Fanuc machines that I have use the same
> format. Possibly this could be changes in the parameters of the machine.
>
> The chamfering amount is on the retraction of the tool at the end of the
> thread. If you leave this amount at 00 the thread will end in a groove

(no

> chamfer) but if you use 05 this will chamfer the thread out to the major
> diameter of the thread for a distance of 5mm.
>
> Hope this helps
>
> Andrew.
>
>
> -----Original Message-----
> From: Dave Kowalczyk <dkowalcz@...> <dkowalcz@...>
> To: CAD_CAM_EDM_DRO@yahoogroups.com <CAD_CAM_EDM_DRO@yahoogroups.com>
> Date: Monday, December 30, 2002 5:57 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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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
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>
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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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>