Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

On Sunday 21 January 2018 23:18:01 MC Cason via Emc-users wrote: > Gene, > >   It's working for me.  Maybe everyone took a long weekend? > Must be, or everyones busy. > On 01/21/2018 08:40 PM, Gene Heskett wrote: > > Its Sunday evening, 21:40, 1/21/18, and the last message is the > > above

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

Gene,   It's working for me.  Maybe everyone took a long weekend? On 01/21/2018 08:40 PM, Gene Heskett wrote: Its Sunday evening, 21:40, 1/21/18, and the last message is the above reply on Thursday. Is the list down? Cheers, Gene Heskett The above content, added by Maurice E. Heskett, is

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

On Thursday 18 January 2018 20:55:55 Gene Heskett wrote: > On Thursday 18 January 2018 15:08:58 tom-...@bgp.nu wrote: > > > On Jan 18, 2018, at 1:04 PM, Gene Heskett > > > wrote: > > > > > > On Thursday 18 January 2018 10:41:50 Kirk Wallace wrote: > > >> On 01/17/2018 11:45

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

On Thursday 18 January 2018 15:08:58 tom-...@bgp.nu wrote: > > On Jan 18, 2018, at 1:04 PM, Gene Heskett > > wrote: > > > > On Thursday 18 January 2018 10:41:50 Kirk Wallace wrote: > >> On 01/17/2018 11:45 AM, tom-...@bgp.nu wrote: > On Jan 17,

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

On 01/18/2018 12:08 PM, tom-...@bgp.nu wrote: ... snip Why is his code only good for 60 degree threads? I think you can use whatever cross slide angle you what. Based on the tool link, maybe 29 / 2 = 14.4? You can also play with the depth of cut for each pass. -- Kirk Wallace

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

> On Jan 18, 2018, at 1:04 PM, Gene Heskett wrote: > > On Thursday 18 January 2018 10:41:50 Kirk Wallace wrote: > >> On 01/17/2018 11:45 AM, tom-...@bgp.nu wrote: On Jan 17, 2018, at 10:43 AM, Kirk Wallace

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

On Thursday 18 January 2018 10:41:50 Kirk Wallace wrote: > On 01/17/2018 11:45 AM, tom-...@bgp.nu wrote: > >> On Jan 17, 2018, at 10:43 AM, Kirk Wallace > >> wrote: > >> > >> I did a rewrite a while back: > >>> http://wallacecompany.com/tmp/G76/G76-7b.cc > >>>

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

On 01/18/2018 07:41 AM, Kirk Wallace wrote: On 01/17/2018 11:45 AM, tom-...@bgp.nu wrote: ... snip (and how)? I would like to test this, what is the best way to install it? -Tom The G76 section in the interp_convert.cc file needs to be edited and recompiled. I use a command that takes

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

On 01/17/2018 11:45 AM, tom-...@bgp.nu wrote: On Jan 17, 2018, at 10:43 AM, Kirk Wallace wrote: I did a rewrite a while back: http://wallacecompany.com/tmp/G76/G76-7b.cc

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

> On Jan 17, 2018, at 10:43 AM, Kirk Wallace > wrote: >> > I did a rewrite a while back: >> http://wallacecompany.com/tmp/G76/G76-7b.cc >> >> http://wallacecompany.com/tmp/G76/Screenshot-g76_kw-1a.png >>

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

On 01/17/2018 03:47 AM, andy pugh wrote: On 17 January 2018 at 01:16, wrote: It seems like the Drive Line is where the tool should come back to on every pass. If it did it would always have clearance (assuming it had clearance to get in the hole in the first place). But that

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

On Wednesday 17 January 2018 09:56:39 andy pugh wrote: > On 17 January 2018 at 15:06, Gene Heskett wrote: > > Does this enco have enough -x room to cut the thread with the tool > > mounted as shown in the youtube video? > > > > If so, this can be done with the g33.1 if the

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

On 17 January 2018 at 15:06, Gene Heskett wrote: > > Does this enco have enough -x room to cut the thread with the tool > mounted as shown in the youtube video? > > If so, this can be done with the g33.1 if the enco can reverse its > spindle fast enough. > > No need for

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

On Wednesday 17 January 2018 08:06:22 Gene Heskett wrote: > On Wednesday 17 January 2018 02:42:51 Marcus Bowman wrote: > > On 16 Jan 2018, at 23:16, tom-...@bgp.nu wrote: > > > We are tying to cut some internal Acme threads on our lathe. We > > > have an internal Acme 8-pitch single point tool.

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

On Wednesday 17 January 2018 02:42:51 Marcus Bowman wrote: > On 16 Jan 2018, at 23:16, tom-...@bgp.nu wrote: > > We are tying to cut some internal Acme threads on our lathe. We > > have an internal Acme 8-pitch single point tool. From the edge of > > the backside of tool to the tip of the

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

On 17 January 2018 at 01:16, wrote: > > It seems like the Drive Line is where the tool should come back to on > every pass. If it did it would always have clearance (assuming it had > clearance to get in the hole in the first place). But that is not what is > happening. From the

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

You could set the parameters of the G76 to cause it to do one pass. That would allow you to change the parameters for every pass until you reach your desired depth. On Jan 17, 2018 1:43 AM, "Marcus Bowman" < marcus.bow...@visible.eclipse.co.uk> wrote: On 16 Jan 2018, at 23:16, tom-...@bgp.nu

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

On 16 Jan 2018, at 23:16, tom-...@bgp.nu wrote: > We are tying to cut some internal Acme threads on our lathe. We have an > internal Acme 8-pitch single point tool. From the edge of the backside of > tool to the tip of the cutting point is 0.490”. The major diameter of our > hole to

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

On Tuesday 16 January 2018 22:48:59 Tom Easterday wrote: > Well, I hope if G76 is indeed broken it can be fixed? > > Acme taps exist but are expensive. They are usually two stage in > order to get the depth cut. We can do rigid tapping on the Emco but > not sure if we have enough travel for the

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

Well, I hope if G76 is indeed broken it can be fixed? Acme taps exist but are expensive. They are usually two stage in order to get the depth cut. We can do rigid tapping on the Emco but not sure if we have enough travel for the long tap and not sure we have enough torque at lower speeds to

Re: [Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

On Tuesday 16 January 2018 18:16:04 tom-...@bgp.nu wrote: > We are tying to cut some internal Acme threads on our lathe. We have > an internal Acme 8-pitch single point tool. From the edge of the > backside of tool to the tip of the cutting point is 0.490”. The major > diameter of our hole to

[Emc-users] G76 tool path not behaving as expected (bad code or bad expectations?)

We are tying to cut some internal Acme threads on our lathe. We have an internal Acme 8-pitch single point tool. From the edge of the backside of tool to the tip of the cutting point is 0.490”. The major diameter of our hole to thread is 0.506. So, you can see there is very little

Re: [Emc-users] G76 docs need a better explanation

On Wed, 21 May 2014 08:31:19 -0400, you wrote: Since lcnc has no clue about the ballistics of the reverse, and therefore cannot predict the over travel, I'm not sure there can be a fix for that other than setting the -limit well into the chuck. My neg working units limit is often well into

Re: [Emc-users] G76 docs need a better explanation

On Thursday 22 May 2014 03:25:24 Steve Blackmore did opine And Gene did reply: On Wed, 21 May 2014 08:31:19 -0400, you wrote: Since lcnc has no clue about the ballistics of the reverse, and therefore cannot predict the over travel, I'm not sure there can be a fix for that other than setting

Re: [Emc-users] G76 docs need a better explanation

On Thu, 22 May 2014 08:20:45 -0400, you wrote: However - I don't use home in LinuxCNC, it's not lathe friendly - I don't find it all that helpful for other than reestablishing positions after a forced shut down in the middle of a job, chip broke, whatever. I don't even find that much use -

Re: [Emc-users] G76 docs need a better explanation

On 5/22/2014 6:20 AM, Gene Heskett wrote: Cutting off is a PIMA on this piece of rubber, and I finally wrote a routine that will work for one cutoff per cutoff blade sharpening. It goes inward about .2mm then pulls back before it can dig in and lock things up, then moves .5mm sideways and

Re: [Emc-users] G76 docs need a better explanation

On Thursday 22 May 2014 19:14:52 Gregg Eshelman did opine And Gene did reply: On 5/22/2014 6:20 AM, Gene Heskett wrote: Cutting off is a PIMA on this piece of rubber, and I finally wrote a routine that will work for one cutoff per cutoff blade sharpening. It goes inward about .2mm then

Re: [Emc-users] G76 docs need a better explanation

On 05/20/2014 08:39 PM, Gene Heskett wrote: Greetings docs maintainers; I found this after noon that there is a large interaction between the driveline value, and the J and K values. My understanding from studying the G76 source is that the J value is intended to be depth of cut for the

Re: [Emc-users] G76 docs need a better explanation

On Tue, 20 May 2014 23:39:28 -0400, you wrote: Greetings docs maintainers; I expect those interactions were expected to be self-evident by the guru's, but from the docs, its not all that well explained. Hi Gene - I've never used the G76 in Linuxcnc but it certainly looks different to the Mach

Re: [Emc-users] G76 docs need a better explanation

On Wednesday 21 May 2014 01:59:34 Kirk Wallace did opine And Gene did reply: On 05/20/2014 08:39 PM, Gene Heskett wrote: Greetings docs maintainers; I found this after noon that there is a large interaction between the driveline value, and the J and K values. My understanding from

Re: [Emc-users] G76 docs need a better explanation

On Wednesday 21 May 2014 03:13:10 Steve Blackmore did opine And Gene did reply: On Tue, 20 May 2014 23:39:28 -0400, you wrote: Greetings docs maintainers; I expect those interactions were expected to be self-evident by the guru's, but from the docs, its not all that well explained. Hi

Re: [Emc-users] G76 docs need a better explanation

On 05/21/2014 05:07 AM, Gene Heskett wrote: ... raising the squeak to several kilohertz. So most of my threads are 40 to 50 pass, 5 to 10 minutes runtime affairs, to get a decent looking thread. For a thread of that size (19,5 mm), make J about one quarter to one third of K, maybe even half

Re: [Emc-users] G76 docs need a better explanation

On Wednesday 21 May 2014 10:30:44 Kirk Wallace did opine And Gene did reply: On 05/21/2014 05:07 AM, Gene Heskett wrote: ... raising the squeak to several kilohertz. So most of my threads are 40 to 50 pass, 5 to 10 minutes runtime affairs, to get a decent looking thread. For a thread

[Emc-users] G76 docs need a better explanation

Greetings docs maintainers; I found this after noon that there is a large interaction between the driveline value, and the J and K values. I believe it should be pointed out that all 3 interact. I made some mods to my wrapper script a few days ago that resulted in only 3 passes to cut the

Re: [Emc-users] G76?

Gene, greetings -Original Message- From: Gene Heskett [mailto:ghesk...@wdtv.com] Sent: 20 January 2013 05:30 Has anyone cut any threads with g76 lately? I fired off a routine that 4 months back worked great, carving a 1/4-28 thread for me several times last fall. Tonight,

Re: [Emc-users] G76?

On Sunday 20 January 2013 11:28:00 Dave Caroline did opine: Message additions Copyright Sunday 20 January 2013 by Gene Heskett On Sun, Jan 20, 2013 at 2:49 AM, Gene Heskett ghesk...@wdtv.com wrote: Greetings all; Has anyone cut any threads with g76 lately? yes and I checked the change

Re: [Emc-users] G76?

On Sunday 20 January 2013 12:36:58 John Prentice (FS) did opine: Message additions Copyright Sunday 20 January 2013 by Gene Heskett Gene, greetings -Original Message- From: Gene Heskett [mailto:ghesk...@wdtv.com] Sent: 20 January 2013 05:30 Has anyone cut any threads with g76

Re: [Emc-users] G76?

On Sunday 20 January 2013 18:45:33 Dave Caroline did opine: Message additions Copyright Sunday 20 January 2013 by Gene Heskett On Sun, Jan 20, 2013 at 2:49 AM, Gene Heskett ghesk...@wdtv.com wrote: Greetings all; Has anyone cut any threads with g76 lately? yes and I checked the change

[Emc-users] G76?

Greetings all; Has anyone cut any threads with g76 lately? I fired off a routine that 4 months back worked great, carving a 1/4-28 thread for me several times last fall. Tonight, without any changes in the .hal file that would affect threading ops, still set to make a 1/4-28 SAE thread, and

Re: [Emc-users] G76?

On Sunday 20 January 2013 00:02:02 Gene Heskett did opine: Message additions Copyright Sunday 20 January 2013 by Gene Heskett Greetings all; Has anyone cut any threads with g76 lately? I fired off a routine that 4 months back worked great, carving a 1/4-28 thread for me several times last

Re: [Emc-users] G76?

On Sun, Jan 20, 2013 at 2:49 AM, Gene Heskett ghesk...@wdtv.com wrote: Greetings all; Has anyone cut any threads with g76 lately? yes and I checked the change log looking for updates to see if any changes were made I fired off a routine that 4 months back worked great, carving a 1/4-28

[Emc-users] G76, G33 revisited.

I just made another discovery. There apparently is not a following error stopper while G76 is running. Cutting all air, and after slowing the Z accel and maxvel to 75% of what I was using 3 days ago, I found that my Z can make a bit over 21 without any following errors regardless of what jig

Re: [Emc-users] G76, G33 revisited.

On 10 June 2012 00:11, gene heskett ghesk...@wdtv.com wrote: despite Z being limited by its maxvel, it kept on trucking, which of course would have wrecked the thread in progress. The normal reaction to a f-error problem is to stop the axes and spindle, which would probably break the tool

[Emc-users] G76 thread depth

I have noticed that I need a lot more thread depth in G76 than the tables say I should need. For instance an M12 thread should have a thread depth of 1.08mm, but I needed 1.55mm before the nut would fit on. I was using a 29.5 degree compound slide angle (Q), do I need to allow for this like you

Re: [Emc-users] G76 thread depth

On a side note, G76 on our Fanuc, using thread depth out of the machinist handbook/threadmaker app, we finish OD threads at a good -.010 to -.030 ( varies by diameter and pitch) wear offset before the gages show the thread in tolerance. Seems like a common problem in other words. On Mon, May 17,

Re: [Emc-users] G76 thread depth

On 17 May 2010 13:08, Daniel Goller mor...@gmail.com wrote: On a side note, G76 on our Fanuc, using thread depth out of the machinist handbook/threadmaker app, we finish OD threads at a good -.010 to -.030 ( varies by diameter and pitch) wear offset before the gages show the thread in

Re: [Emc-users] G76 Threading

-- Forwarded message -- From: Andy Pugh bodge...@gmail.com Date: 2009/9/27 Subject: Re: G76 Threading To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net 2009/9/27 Andy Pugh bodge...@gmail.com: http://www.youtube.com/watch?v=NDA48nLdbiI More data after a long

[Emc-users] G76 Threading

(I thought you were all ignoring my questions, but I suspect that I was sending from an email address not registered with the listserver. Brace yourselves for a flurry of posts) I seem to be having a spot of bother with G76. I thought it was working fine, then noticed that the z axis was running

Re: [Emc-users] G76 Threading

2009/9/27 Andy Pugh bodge...@gmail.com: 2009/9/27 Andy Pugh bodge...@gmail.com: http://www.youtube.com/watch?v=NDA48nLdbiI More information. G33 is exactly the same. Smaller pitches are better, but even 1.25mm pitch (20 tpi) occasionally gets the wobbles. -- atp -- atp

Re: [Emc-users] G76 Threading

On Tue, 2009-09-29 at 17:04 +0100, Andy Pugh wrote: ... snip http://www.youtube.com/watch?v=NDA48nLdbiI More data after a long discussion on the IRC channel: HAL setup: http://www.pastebin.ca/1581821 Halscope grabs: http://www.atp.pwp.blueyonder.co.uk/G76.png

Re: [Emc-users] G76 Threading

2009/9/29 Kirk Wallace kwall...@wallacecompany.com: I have only read the original post and watched the video, so I may be off base here. I had the same symptoms on my lathe. I believe the thread pitch and spindle RPM are at a rate that is beyond the Z axis abilities to accelerate. I slowed my

Re: [Emc-users] G76

Hi Chris, Steve wants the display units to change with the G-code. If the code is metric, the display is metric. If the code is inch the display is in inches. Having inch code with metric DROs or vice-versa can be very confusing. Les You can pick whichever display units you want in the

Re: [Emc-users] G76

On Sun, 30 Aug 2009 20:17:09 -0500, you wrote: Additionally - difficult to tell what's going on, lathe is set up in mm, when running a G20 file, DRO's and feed still display in metric units :( You can pick whichever display units you want in the menu. With AXIS you can have any combination

Re: [Emc-users] G76

I don't agree with that. I like to have the user interface in mm only, doesn't matter if I load one of my programs, or something I received from across the pond :) The real answer actually is: either way there will be a group of people that won't like the default behaviour (either switching or

Re: [Emc-users] G76

On Sun, 30 Aug 2009 23:38:18 +0100, you wrote: It would appear from the parameters that the G76 doesn't support taper threads. No it doesn't. I had to do a taper thread today and the only way was with G33. I was writing two post processors for Dolphin and FeatureCam, but it's not worth

Re: [Emc-users] G76

On Mon, Aug 31, 2009 at 11:35:43AM +0100, Steve Blackmore wrote: Hi Chris - thanks found inches/mm in view menu. As Les said it would be good if it changed with G20/G21 automatically. I disagree. I compare the numbers on the DRO to the numbers on my dial caliper, and the numbers on my dial

Re: [Emc-users] G76

On Mon, 31 Aug 2009 08:48:03 -0500, you wrote: On Mon, Aug 31, 2009 at 11:35:43AM +0100, Steve Blackmore wrote: Hi Chris - thanks found inches/mm in view menu. As Les said it would be good if it changed with G20/G21 automatically. I disagree. I compare the numbers on the DRO to the numbers

[Emc-users] G76

Can somebody explain G76 please. I don't understand the implementation method, in particular the drive line mentioned in the manual. The docs say the sample program g76.ngc shows the method. The figures in that don't make sense for a 1/4x20 thread. The initial position is z.2 z.2 The major

Re: [Emc-users] G76

On Sun, 30 Aug 2009 12:56:14 +0100, you wrote: Can somebody explain G76 please. I don't understand the implementation method, in particular the drive line mentioned in the manual. The docs say the sample program g76.ngc shows the method. The figures in that don't make sense for a 1/4x20

Re: [Emc-users] G76

Hi Steve, Here's my take on G76: I don't understand the implementation method, in particular the drive line mentioned in the manual. The drive line is the safe clearance outside the thread. It is the current X axis position when you call G76. I normally use thread peak + 1mm. I is the

Re: [Emc-users] G76

Additionally - difficult to tell what's going on, lathe is set up in mm, when running a G20 file, DRO's and feed still display in metric units :( You can pick whichever display units you want in the menu. With AXIS you can have any combination of units: inifile units, gcode program units,

Re: [Emc-users] G76 inifinite loop

To: 'Enhanced Machine Controller (EMC)' emc-users@lists.sourceforge.net Sent: Monday, July 06, 2009 1:50 AM Subject: [Emc-users] G76 inifinite loop If I put in an invalid G76 threading command in some gcode, such as... G76 P1.6 Z0 I-1.6 J0 K1.6 R2 H0 E0 L0 Where J, the initial depth of cut

Re: [Emc-users] G76 inifinite loop

This is surely bug and will be fixed in emc 2.3.3 Thanks for bug report, Michael Frank Tkalcevic pisze: If I put in an invalid G76 threading command in some gcode, such as... G76 P1.6 Z0 I-1.6 J0 K1.6 R2 H0 E0 L0 Where J, the initial depth of cut, is 0, axis gets stuck in an infinite

[Emc-users] G76 inifinite loop

If I put in an invalid G76 threading command in some gcode, such as... G76 P1.6 Z0 I-1.6 J0 K1.6 R2 H0 E0 L0 Where J, the initial depth of cut, is 0, axis gets stuck in an infinite loop. Obviously this is wrong because the thread will never finish, but it took me an hour to track this down