---
From: Les Newell [mailto:les.new...@fastmail.co.uk]
Sent: February-05-21 8:07 AM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Spindle speed changes with threading.
I just tried it on my lathe. I scratch cut a coarse pitch thread at low
spindle speed then repeated the cut at abo
On 02/05/2021 01:35 PM, Gene Heskett wrote:
On Friday 05 February 2021 13:53:44 Jon Elson wrote:
On 02/05/2021 10:07 AM, Gene Heskett wrote:
You have my curiosity bump itching Jon, When I get my stuff back
together on the GO704, and get my new 'scope unpacked, I'll take a
look at the step driv
On 02/05/2021 01:11 PM, johnd wrote:
What's the resolution of your spindle encoder and base period servo period?
There is no base thread on this servo system. The servo
thread runs at 1 KHz.
The spindle encoder uses the bull gear in the mill's head,
so it has 324 counts/rev.
Jon
Boy my Samsung phone doesn't format messages very well for this group.
OK. So I'll ask again. If you'd done tapping or threading with LinuxCNC:
1. What resolution encoder are you using?
2. What is the BASIC_PERIOD?
3. What is the SERVO_PERIOD?
Thanks
John Dammeyer
__
On Friday 05 February 2021 13:53:44 Jon Elson wrote:
> On 02/05/2021 10:07 AM, Gene Heskett wrote:
> > You have my curiosity bump itching Jon, When I get my stuff back
> > together on the GO704, and get my new 'scope unpacked, I'll take a
> > look at the step drive output and answer that itch.
>
>
What's the resolution of your spindle encoder and base period servo period?Sent
from my Samsung S10
Original message From: Jon Elson
Date: 2021-02-05 10:56 a.m. (GMT-08:00) To: "Enhanced Machine Controller
(EMC)" Subject: Re: [Emc-users] Spindle spee
On 02/05/2021 11:03 AM, John Dammeyer wrote:
Hi Gene,
But it's also been reported that with LinuxCNC it's possible to stop the
spindle while still in Threading Mode and then turn the spindle by hand and the
carriage will follow. This is of course on a lathe. Not something you'd do on
a mill
On 02/05/2021 10:07 AM, Gene Heskett wrote:
You have my curiosity bump itching Jon, When I get my stuff back together
on the GO704, and get my new 'scope unpacked, I'll take a look at the
step drive output and answer that itch.
You actually should be able to check this out with
Halscope. Look
On Friday 05 February 2021 12:03:48 John Dammeyer wrote:
> Hi Gene,
> But it's also been reported that with LinuxCNC it's possible to stop
> the spindle while still in Threading Mode and then turn the spindle by
> hand and the carriage will follow. This is of course on a lathe. Not
> something y
ewell [mailto:les.new...@fastmail.co.uk]
> Sent: February-05-21 8:07 AM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] Spindle speed changes with threading.
>
> I just tried it on my lathe. I scratch cut a coarse pitch thread at low
> spindle speed then repeated the
> From: Jon Elson [mailto:el...@pico-systems.com]
> On 02/05/2021 03:15 AM, Gene Heskett wrote:
> > On Friday 05 February 2021 02:57:38 John Dammeyer wrote:
> >
> >> Granted this subject is a bit old I've now had some time to dive back
> >> into the TI F2837xD which has dual processors and other fe
t a problem. And as long as the system
can respond to that encoder change fast enough.
See the issue?
John
> -Original Message-
> From: Gene Heskett [mailto:ghesk...@shentel.net]
> Sent: February-05-21 1:16 AM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users]
I just tried it on my lathe. I scratch cut a coarse pitch thread at low
spindle speed then repeated the cut at about twice the spindle speed. I
ended up with two distinct threads. The moral of the story is to make
sure your spindle speed is stable before starting threading.
Les
___
On Friday 05 February 2021 10:27:30 Jon Elson wrote:
> On 02/05/2021 03:15 AM, Gene Heskett wrote:
> > On Friday 05 February 2021 02:57:38 John Dammeyer wrote:
> >> Granted this subject is a bit old I've now had some time to dive
> >> back into the TI F2837xD which has dual processors and other
>
On 02/05/2021 03:15 AM, Gene Heskett wrote:
On Friday 05 February 2021 02:57:38 John Dammeyer wrote:
Granted this subject is a bit old I've now had some time to dive back
into the TI F2837xD which has dual processors and other features that
will make it a good test bed for trying out stuff.
It
On Friday 05 February 2021 02:57:38 John Dammeyer wrote:
> Granted this subject is a bit old I've now had some time to dive back
> into the TI F2837xD which has dual processors and other features that
> will make it a good test bed for trying out stuff.
>
> It has a hardware Quadrature Encoder Int
20-21 10:12 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Spindle speed changes with threading.
>
> Hi All,
>
> As others have said, during position-synched moves, the axes follow the
> spindle position, so you don't need fine control of spindle speed. How
Hi John,
Good catch! Andy also pointed out that multi-start threading is of course
possible if you do a Z offset like you describe. I was thinking of "native"
support for multi-start in G33 / G33.1, like with a word specifying the
start location in degrees.
-Rob
_
Thanks Rob,
Comments below.
> -Original Message-
> From: Robert Ellenberg [mailto:rwe...@gmail.com]
> Sent: January-20-21 10:12 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Spindle speed changes with threading.
>
> Hi All,
>
>
>
> Ahh, good point! It would be nice to be able to explicitly specify a
> spindle angle too, but that's a good workaround.
I always thought about having a way to offet the index pulse. But since
most people use hardware for encoder counting, I suspect the solution
should be right there in the ha
Ahh, good point! It would be nice to be able to explicitly specify a
spindle angle too, but that's a good workaround.
On Wed, Jan 20, 2021, 1:50 PM Andy Pugh wrote:
>
>
> > On 20 Jan 2021, at 18:14, Robert Ellenberg wrote:
> >
> >
> > Note that multi-start threading is not currently possible
>
> On 20 Jan 2021, at 18:14, Robert Ellenberg wrote:
>
>
> Note that multi-start threading is not currently possible
You can do it by offsetting the start point.
(If there is room)
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
http
Hi All,
As others have said, during position-synched moves, the axes follow the
spindle position, so you don't need fine control of spindle speed. However,
you should have both a stable spindle RPM and a high-ish resolution encoder
to get the best results. John, for your example, as each encoder p
> From: andy pugh [mailto:bodge...@gmail.com]
>
> On Wed, 20 Jan 2021 at 16:09, Kirk Wallace
> wrote:
>
> > I left the trail here:
> > > https://github.com/LinuxCNC/linuxcnc/blob/master/src/emc/rs274ngc/interp_convert.cc#L4881-L5028
>
> There seems to have been a lot of time spent investiga
And if so where is the real code for
START_SPEED_FEED_SYNCH?
John Dammeyer
> -Original Message-
> From: Kirk Wallace [mailto:kwall...@wallacecompany.com]
> Sent: January-20-21 8:07 AM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] Spindle speed changes with
On Wed, 20 Jan 2021 at 16:09, Kirk Wallace wrote:
> I left the trail here:
> > https://github.com/LinuxCNC/linuxcnc/blob/master/src/emc/rs274ngc/interp_convert.cc#L4881-L5028
There seems to have been a lot of time spent investigating theory that
could have been settled in 5 minutes with an exper
(bottom posted this one)
On 1/19/21 9:42 PM, John Dammeyer wrote:
I dont think, the z position is "geared" to the counts beyond
index so locked unambiguously to spindle angle beyond index,
after initial sync is acheived.
Peter Wallace
Mesa Electronics
So far that makes sense. From "LinuxCNC
> I dont think, the z position is "geared" to the counts beyond
> index so locked unambiguously to spindle angle beyond index,
> after initial sync is acheived.
>
>
> Peter Wallace
> Mesa Electronics
So far that makes sense. From "LinuxCNC User manual"
"The tool will pause briefly for synchr
On Tuesday 19 January 2021 15:50:49 Todd Zuercher wrote:
> I under stand the analogy, but I wonder if Linuxcnc is erroneously
> behaving as if the "leadscrew" were multiple start, with the number of
> starts equal to the encoder's counts/rev. Resulting in the syncing of
> the axis to the spindle
On Tue, 19 Jan 2021, Todd Zuercher wrote:
Date: Tue, 19 Jan 2021 20:50:49 +
From: Todd Zuercher
Reply-To: "Enhanced Machine Controller (EMC)"
To: "Enhanced Machine Controller (EMC)"
Subject: Re: [Emc-users] Spindle speed changes with threading.
I under stan
d Zuercher
P. Graham Dunn Inc.
630 Henry Street
Dalton, Ohio 44618
Phone: (330)828-2105ext. 2031
-Original Message-
From: Peter C. Wallace
Sent: Tuesday, January 19, 2021 3:10 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Spindle speed changes with threading.
On Tue, 19 Jan 2021, Gene Heskett wrote:
It wasn't the last time I tested it Jon, and most of the recent
conversations here are ignoreing the fact that every new stroke,
starting from its resting position, regardless of whether its a G76 or
you are "pecking" a G33.1 for rigid tapping, is a NEW s
On Tuesday 19 January 2021 12:48:32 Jon Elson wrote:
> On 01/18/2021 05:47 PM, John Dammeyer wrote:
> >>> So what does LinuxCNC do? Is the thread mucked up if spindle
> >>> speed is changed during a feed hold and then start?
> >>
> >> Feed hold has nothing to do with it John, you can't change the
On 01/18/2021 05:47 PM, John Dammeyer wrote:
So what does LinuxCNC do? Is the thread mucked up if spindle speed is
changed during a feed hold and then start?
Feed hold has nothing to do with it John, you can't change the spindle
speed in mid thread. Full stop. Period. I think it could do what
On Mon, 18 Jan 2021, Gene Heskett wrote:
Date: Mon, 18 Jan 2021 23:36:37 -0500
From: Gene Heskett
Reply-To: "Enhanced Machine Controller (EMC)"
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Spindle speed changes with threading.
On Monday 18 January 2021 22:21:
On Monday 18 January 2021 22:21:00 Peter C. Wallace wrote:
> On Mon, 18 Jan 2021, Gene Heskett wrote:
> > But because once locked, its not a big deal if the cutting load
> > slows the spindle 25%, its still locked at that phase angle and it
> > will stay that way until the end of THAT cut stroke.
On Mon, 18 Jan 2021, Gene Heskett wrote:
But because once locked, its not a big deal if the cutting load slows the
spindle 25%, its still locked at that phase angle and it will stay that
way until the end of THAT cut stroke. But if YOU change the spindle
speed, then YOU have changed the synch d
On 1/18/21 3:53 PM, Andy Pugh wrote:
On 18 Jan 2021, at 23:08, John Dammeyer wrote:
So what does LinuxCNC do? Is the thread mucked up if spindle speed is changed
during a feed hold and then start?
I believe that it does. The docs specifically warn against Chang speed during a
threading cy
On Monday 18 January 2021 18:47:25 John Dammeyer wrote:
> > > So what does LinuxCNC do? Is the thread mucked up if spindle
> > > speed is changed during a feed hold and then start?
> >
> > Feed hold has nothing to do with it John, you can't change the
> > spindle speed in mid thread. Full stop. P
On Mon, 18 Jan 2021, John Dammeyer wrote:
Date: Mon, 18 Jan 2021 15:58:12 -0800
From: John Dammeyer
Reply-To: "Enhanced Machine Controller (EMC)"
To: "'Enhanced Machine Controller (EMC)'"
Subject: Re: [Emc-users] Spindl
Thanks Jon.
More questions below then.
> > Quick question about threading with LinuxCNC. If you do a feed hold
> > between passes for cutting a thread and during that feed hold
> change the spindle speed what will happen?
> >
> No problem. At the beginning of EACH pass, the spindle
> encoder i
> On 18 Jan 2021, at 23:08, John Dammeyer wrote:
>
> So what does LinuxCNC do? Is the thread mucked up if spindle speed is
> changed during a feed hold and then start?
I believe that it does. The docs specifically warn against Chang speed during a
threading cycle.
_
> > So what does LinuxCNC do? Is the thread mucked up if spindle speed is
> > changed during a feed hold and then start?
> >
> Feed hold has nothing to do with it John, you can't change the spindle
> speed in mid thread. Full stop. Period. I think it could do what is
> needed. But its like Yogi B
On 01/18/2021 05:05 PM, John Dammeyer wrote:
Quick question about threading with LinuxCNC. If you do a feed hold between
passes for cutting a thread and during that feed hold change the spindle speed
what will happen?
No problem. At the beginning of EACH pass, the spindle
encoder is zeroe
On Monday 18 January 2021 18:05:56 John Dammeyer wrote:
> Quick question about threading with LinuxCNC. If you do a feed hold
> between passes for cutting a thread and during that feed hold change
> the spindle speed what will happen?
>
> From a start it takes a certain amount of time to accelera
Quick question about threading with LinuxCNC. If you do a feed hold between
passes for cutting a thread and during that feed hold change the spindle speed
what will happen?
>From a start it takes a certain amount of time to accelerate up to the
>required speed. If the spindle is turning twic
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