If you mean by an open ended timing belt that is fixed at both ends and the
motor is traversing along the belt then, yes. One glaring omission in my
initial reply was not accounting for a speed reduction. I'm guess there
will be one between your servo and timing belt pulley. In that case you
have t
On Thursday 10 September 2015 22:10:50 Gene Heskett wrote:
> On Thursday 10 September 2015 20:46:50 andy pugh wrote:
> > On 11 September 2015 at 01:44, andy pugh wrote:
> > > I think you should use RPM all the way to the pwmgen and limit the
> > > pid to 98% of the pwmgen.scale
> >
> > Actually,
On Thursday 10 September 2015 20:46:50 andy pugh wrote:
> On 11 September 2015 at 01:44, andy pugh wrote:
> > I think you should use RPM all the way to the pwmgen and limit the
> > pid to 98% of the pwmgen.scale
>
> Actually, given that encoder velocity is returned in RPS then use RPS
> all the w
> On Sep 10, 2015, at 4:50 PM, Chris Radek wrote:
> Can you say again what problem you are
> trying to solve? Maybe I missed something. I don't want to guess.
Well, basically it was to get rid of the vibration or sound that G33 makes
(very different from the smooth quiet G1’s) which we believ
On 11 September 2015 at 01:44, andy pugh wrote:
> I think you should use RPM all the way to the pwmgen and limit the pid
> to 98% of the pwmgen.scale
Actually, given that encoder velocity is returned in RPS then use RPS
all the way, from motion.spindle-speed-out-rps all the way through the
pid to
On 11 September 2015 at 00:56, Gene Heskett wrote:
> So if I am using a scale factor there, to tame the axis big jumps when
> clicking on the + and - buttons, it seems to me that the value I apply
> to a limit2 in front of your 5i25 pwmgen should also be scaled up by
> this same scale factor.
I t
Peter;
I am attempting to setup a new control chain for my lathes spindle. One
that will be a bunch simpler in the hal file.
The 5i25's pwmgen actually has a duty cycle range from about 1% to 98% of
so.
So if I am using a scale factor there, to tame the axis big jumps when
clicking on the +
If you have an AC current pickup transformer and a scope around, it is
really easy to see what is going on with the motor. Put one motor lead
through the transformer, put a burden resistor across the transformer and
put the scope across the resistor. This will show you the current flow of
the motor
On Thu, Sep 10, 2015, at 04:24 PM, Tom Easterday wrote:
>
> > On Sep 10, 2015, at 1:58 PM, John Kasunich wrote:
> >
> … ultimately pointed to the issue>...
>
> It was a good suggestion to forget about G33 and run the spindle my itself.
> Even at max rpm (3000) we still have the same noisy sp
The hard drive was starting to fail on the 10.04 install. Downloaded
the latest 2.7 wheezy iso and installed it on a new SSD
3 small hurdles.
-removed probe-paraport from the hal file
-removed mesa pet watchdog function
-figure out how to get the arduino working
Took about 20 minutes after the f
I have a Swedish keyboard installed. In 2.5.4 (Ubuntu) there is Setting,
Keyboard, Layout and Options where you can change key behavior. In my case I
could change comma (,) to dot (.) in the numeric keypad.
I would like to do the same change In 2.7.0 (Wheezy). It´s inconvinient not
having dot in t
On Thursday 10 September 2015 11:47:04 Tom Easterday wrote:
> > On Sep 10, 2015, at 11:34 AM, Gene Heskett
> > wrote: I have not encountered anything even remotely resembling that
> > on my lathe with its 200 edge/turn A/B/Z homemade encoder.
> >
> > If it was jerking at 50 revs, thats more than
Hi all;
Years ago ISTR there was a setting in the intro to the .ini file that set
the scale of the effect of the spindle speed +- buttons.
In trying to see if I can incorporate a limit3 whose maxa sets the accel
limit applied to the pid.s.commnd, I have tried to get to a unity gain
thru the ch
On Thu, Sep 10, 2015 at 10:25:51PM +0200, Martin Smith wrote:
> Having Swedish keyboards I would like to change the numeric keyboard?s
> delete key behavior from comma to dot. This option is not availible in
> 2.7.0 Wheezy?s keyboard preferences. Is there any way to make this change?
I was able
On Thu, Sep 10, 2015 at 04:24:33PM -0400, Tom Easterday wrote:
>
> A question: We would like to perhaps smooth the velocity input
> that the trajectory planner uses for G33 commands. What signal
> does it use for the velocity in spindle coordinated motion? It
Spindle-sync motion is a position
Having Swedish keyboards I would like to change the numeric keyboard´s
delete key behavior from comma to dot. This option is not availible in
2.7.0 Wheezy´s keyboard preferences. Is there any way to make this change?
Martin
---
> On Sep 10, 2015, at 1:58 PM, John Kasunich wrote:
>
…...
It was a good suggestion to forget about G33 and run the spindle my itself.
Even at max rpm (3000) we still have the same noisy spindle-speed-in signal.
So to make a long story short, the source of the variation in the
spindle-spee
> On Sep 10, 2015, at 12:17 PM, sam sokolik wrote:
>
> could we see the gcode you are running?
G8
G53 G0 X0
G53 G0 Z0
M6 T3 G43
# = 0.700
# = [#/2]
# = 0.025
# = [# + #]
# = 0.000
# = 0.25
# = 0.010
# = 0.002
# = 28
# = 30
# = [# - #]
# = 100
# = 3.142
; The surface is the circumference o
*Hello,This machine (xpst700r/geforce 256 agp/3 axis mill) worked*
*so well with emc2.4 under Ubuntu 8.04 *
*But with Linuxcnc 2.7 under Debian Wheezy it has this weird*
*realtime delay check error on cycle start.*
*I can have 4 glxgears and iceweasel downloading huge graphic*
*while machine
The scope pictures need some accompanying explanation from the
original poster.
My guess would be that each cycle of the spindle-revs sawtooth is
one pass of the G33 cycle.
The falling edge of the sawtooth happens when the spindle hits the
index before the pass. Axis speed prior to that point is
On 09/10/2015 10:00 AM, Tom Easterday wrote:
> Sorry, that was the plot when using G1 (smooth). Here is the plot using G33,
> notice all the noise on the joint velocity command:
> http://bgp.nu/~tom/pub/noise-velocity-G33.png
> -Tom
>
>
Why is the command jumping all over the place? It appears
On 09/10/2015 12:36 AM, Gregg Eshelman wrote:
> On 9/9/2015 10:57 AM, Jon Elson wrote:
>
>> I have a rough design already made up, uses wheels that are
>> advanced when the balls hit levers. Different length pins
>> on the wheels allow the levers to drop the ball to two
>> different tracks to perf
On Thu, 10 Sep 2015, Tom Easterday wrote:
Date: Thu, 10 Sep 2015 12:07:31 -0400
From: Tom Easterday
Reply-To: "Enhanced Machine Controller (EMC)"
To: "Enhanced Machine Controller (EMC)"
Subject: Re: [Emc-users] G33 and motion-spindle-speed-in,
motion-spindle-revs (2.7.0-pre7)
I also
could we see the gcode you are running?
On 9/10/2015 11:07 AM, Tom Easterday wrote:
> I also wonder if all the noise in the commanded velocity using G33 could be a
> result of the new trajectory planner (being better at lots of little moves)
> send lots of commands in response to the changes of
I also wonder if all the noise in the commanded velocity using G33 could be a
result of the new trajectory planner (being better at lots of little moves)
send lots of commands in response to the changes of position at low speed…?
-Tom
---
> On Sep 10, 2015, at 11:34 AM, Gene Heskett wrote:
> I have not encountered anything even remotely resembling that on my lathe
> with its 200 edge/turn A/B/Z homemade encoder.
>
> If it was jerking at 50 revs, thats more than 1 second per turn and the
> speed changes would be extremely visibl
On Thursday 10 September 2015 10:36:04 Peter C. Wallace wrote:
> On Thu, 10 Sep 2015, Tom Easterday wrote:
> > Date: Thu, 10 Sep 2015 10:07:59 -0400
> > From: Tom Easterday
> > Reply-To: "Enhanced Machine Controller (EMC)"
> >
> > To: "Enhanced Machine Controller (EMC)"
> > Subject: Re: [Em
> On Sep 10, 2015, at 10:36 AM, Peter C. Wallace wrote:
> Looks like you spindle simply cannot keep accurate speed control at the very
> low speed you are turning (50 RPM?) I suspect if you really need accurate 50
> RPM speeds a VFD is not going to do it without a large gear reduction
Yes, the
Sorry, that was the plot when using G1 (smooth). Here is the plot using G33,
notice all the noise on the joint velocity command:
http://bgp.nu/~tom/pub/noise-velocity-G33.png
-Tom
> On Sep 10, 2015, at 10:07 AM, Tom Easterday wrote:
> The Halscope plot which I mean to post with the first messa
On Thu, 10 Sep 2015, Tom Easterday wrote:
Date: Thu, 10 Sep 2015 10:07:59 -0400
From: Tom Easterday
Reply-To: "Enhanced Machine Controller (EMC)"
To: "Enhanced Machine Controller (EMC)"
Subject: Re: [Emc-users] G33 and motion-spindle-speed-in,
motion-spindle-revs (2.7.0-pre7)
The enc
The encoder is fed into a Mesa 7i85s/5i25 running Hostmot2 encoder module. I
don’t see any other output I could use…
The Halscope plot which I mean to post with the first message is here:
http://bgp.nu/~tom/pub/noise-velocity.png
-Tom
> On Sep 10, 2015, at 7:18 AM, andy pugh wrote:
>
> On 10
Yes.
On 9/10/2015 7:36 AM, John Thornton wrote:
> It's a timing belt drive, would that be close to a rack and pinion?
>
> JT
>
> On 9/9/2015 11:58 PM, Milosz K. wrote:
>> John,
>>
>> Assuming this is a rack & pinion type configuration:
>>
>> angular v (w) = linear vel * pulley radius (R)
>> angula
It's a timing belt drive, would that be close to a rack and pinion?
JT
On 9/9/2015 11:58 PM, Milosz K. wrote:
> John,
>
> Assuming this is a rack & pinion type configuration:
>
> angular v (w) = linear vel * pulley radius (R)
> angular accel (alpha) = linear accel * R
> Jreflected = (gantry mass
On 10 September 2015 at 02:53, Tom Easterday wrote:
> believe there really is a small variation in the spindle but not sure why or
> how to deal with it so that
Does your encoder counter offer a position-interpolated output? That
might be smoother.
--
atp
If you can't fix it, you don't own it.
On 10 September 2015 at 03:02, Jon Elson wrote:
> No, no springs! I was thinking of a crystal oscillator
To get even more off-track, it isn't much more, if any more, effort to
pick up GPS time or a Radio time:
https://youtu.be/LwpqX9QK1zU
--
atp
If you can't fix it, you don't own it.
http://ww
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