On Friday 08 May 2020 22:36:35 Dan Henderson wrote:
> Thanks for the examples. I'm not going to lie, I've got some homework
> to do on this. You guy's make this sound easy but to the new guy
> looking in? No so much, lol
Don't be glum Dan, you've already demo'd to me that you WILL get there.
Thanks for the examples. I'm not going to lie, I've got some homework to do
on this. You guy's make this sound easy but to the new guy looking in? No
so much, lol
On Fri, May 8, 2020 at 9:01 PM Jon Elson wrote:
> On 05/08/2020 06:45 PM, Gene Heskett wrote:
> > On Friday 08 May 2020 18:01:41
On 05/08/2020 06:45 PM, Gene Heskett wrote:
On Friday 08 May 2020 18:01:41 Jon Elson wrote:
On 05/08/2020 04:04 PM, Dan Henderson wrote:
Thanks Jon and Chris!
Jon do you have a code example of the Hal filter that is needed?
# set up 4th DAC generator as a spindle speed control
newsig
On Friday 08 May 2020 18:01:41 Jon Elson wrote:
> On 05/08/2020 04:04 PM, Dan Henderson wrote:
> > Thanks Jon and Chris!
> >
> > Jon do you have a code example of the Hal filter that is needed?
>
> # set up 4th DAC generator as a spindle speed control
> newsig spindle-speed float
> newsig
On 05/08/2020 04:04 PM, Dan Henderson wrote:
Thanks Jon and Chris!
Jon do you have a code example of the Hal filter that is needed?
# set up 4th DAC generator as a spindle speed control
newsig spindle-speed float
newsig spindle-DAC-cmd float
newsig spindle-DAC-filt float
newsig spindle-DAC-abs
On Fri, 8 May 2020 at 21:58, Chris Albertson wrote:
> If a new digital oscilloscope is out of budget then look at one of these:
> ebay.com/itm/USB-SALEAE-24M-8CH-Logic-Analyzer...
>
Thanks Jon and Chris!
Jon do you have a code example of the Hal filter that is needed?
On Fri, May 8, 2020 at 3:58 PM Chris Albertson
wrote:
> You have to compare the signals on BOTH sides of the interface to see what
> is happening. The build-in halscope can only see what has crossed the
>
You have to compare the signals on BOTH sides of the interface to see what
is happening. The build-in halscope can only see what has crossed the
interface. Compare this to what is on the parallel port pins and also what
is on the encoder side of the opto-isolators.
If a new digital
On 05/08/2020 01:34 PM, Dan Henderson wrote:
There are times when letting the smoke escape becomes part of the learning
process :)
Thanks for your guidance Gene. Would think the DC motor energy would be
absorbed by the act of tapping once the M3 is turned off? Surely the G33.1
cycle doesn't
Thanks Gene. Will consider how to get this done in the Hal based on your
tips.
On Fri, May 8, 2020 at 2:03 PM Gene Heskett wrote:
> On Friday 08 May 2020 14:34:06 Dan Henderson wrote:
>
> > There are times when letting the smoke escape becomes part of the
> > learning process :)
> >
> yes, and
On Friday 08 May 2020 14:34:06 Dan Henderson wrote:
> There are times when letting the smoke escape becomes part of the
> learning process :)
>
yes, and we all do it, its the nature of us.
> Thanks for your guidance Gene. Would think the DC motor energy would
> be absorbed by the act of tapping
There are times when letting the smoke escape becomes part of the learning
process :)
Thanks for your guidance Gene. Would think the DC motor energy would be
absorbed by the act of tapping once the M3 is turned off? Surely the G33.1
cycle doesn't flip from 500 CW to 500 CCW does it? I'm going to
I doubt you really want opots on an encoder. The data rate can be VERY
high. Also, I bet these encoders are already using LEDs and
phototransisters. Just power the DRO from the same supply as the interface
it is connected to.
The price is very good. I did not know glass slide DROs ad come
On 05/08/2020 11:38 AM, John Dammeyer wrote:
Hi Jon,
I suppose you are using external hardware to create motion and count encoder
pulses?
So BASE_PERIOD isn't even used?
Or is it still needed for tapping?
My understanding is the SERVO_PERIOD time is used to calculate the spindle
velocity
On Fri, 8 May 2020 at 18:19, John Dammeyer wrote:
> But I don't see where emcmotCommand->command is changed.
> Need to take a break from this.
Interp:
https://github.com/LinuxCNC/linuxcnc/blob/2.8/src/emc/rs274ngc/interp_convert.cc#L3142
added to queue:
On Friday 08 May 2020 13:34:36 Gene Heskett wrote:
> On Friday 08 May 2020 12:09:45 Dan Henderson wrote:
> > Thanks Andy/Jon/Gene. To enable Quadrature do I merely turn on
> > phase-A/B/index inputs and remove “encoder-counter-mode = True”?
>
> Sounds good.
>
> > Here’s a pic of the reverse
On Friday 08 May 2020 12:35:34 andy pugh wrote:
> On Fri, 8 May 2020 at 16:58, Gene Heskett wrote:
> > Humm, makes me ask, Andy. I am useing some hal trickery to actually
> > sequence this turnaround and to profile it to where z can follow.
> > Because I am blocking the reversal signal, using it
On Friday 08 May 2020 12:09:45 Dan Henderson wrote:
> Thanks Andy/Jon/Gene. To enable Quadrature do I merely turn on
> phase-A/B/index inputs and remove “encoder-counter-mode = True”?
>
Sounds good.
> Here’s a pic of the reverse circuit I’m making to enable M4 polarity
> reversal of the DC
I've changed the subject line to more reflect the information I'm after.
So far I've been working through hal_parport.c, encoder.c, motion.c, stepgen.c
control.c and command.c.
I believe this function is called at the SERVO_PERIOD rate.
void emcmotCommandHandler(void *arg, long period)
The
On Fri, 8 May 2020 at 18:02, John Dammeyer wrote:
>
> Thanks Andy,
> Just more and more complicated. Need to take a step back and just figure out
> how encoder edges seen as 1's and 0's in hal_parport.c turn into spindle
> velocity.
G33, G33.1, G76 use spindle _position_ not velocity.
And if
Thanks Andy,
Just more and more complicated. Need to take a step back and just figure out
how encoder edges seen as 1's and 0's in hal_parport.c turn into spindle
velocity.
And in the other direction how a S600 ends up as the PWM 1's and 0's in
hal_parport.c.
John Dammeyer
> -Original
> -Original Message-
> From: Jon Elson [mailto:el...@pico-systems.com]
> Sent: May-08-20 9:21 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Fluctuating RPM using CUI ATM 10 encoder
>
> On 05/07/2020 06:33 PM, Dan Henderson wrote:
> > Thanks Gene! I can go down
On Friday 08 May 2020 11:16:21 dave engvall wrote:
> HI all,
> My ancient Acu-rite III DRO has gone flaky. I ordered one off the
> following link.
Some of those older devices used a light bulb that slowly got black, and
a new light bulb fixes them right up.
>
On Fri, 8 May 2020 at 16:58, Gene Heskett wrote:
> Humm, makes me ask, Andy. I am useing some hal trickery to actually
> sequence this turnaround and to profile it to where z can follow.
> Because I am blocking the reversal signal, using it to stop the motor at
> a controlled decel by a limit3
On 05/07/2020 06:43 PM, Dan Henderson wrote:
I should have mentioned, I’m in the process of building a reverse polarity
circuit to trip polarity by issuing a CCW M4 via a 5v output. My motor
controller doesn’t natively support CCW.
I entered the code and it made it all the way down until the
On 05/07/2020 06:33 PM, Dan Henderson wrote:
Thanks Gene! I can go down to 48 PPR on the encoder. If I do so, what is
the trade off for reducing resolution on my mill project? Is that enough to
successfully use rigid tapping and synchronized feed/speeds?
48 pulses is 192 quadrature counts/rev,
Thanks Andy/Jon/Gene. To enable Quadrature do I merely turn on
phase-A/B/index inputs and remove “encoder-counter-mode = True”?
Here’s a pic of the reverse circuit I’m making to enable M4 polarity
reversal of the DC motor.
On Fri, May 8, 2020 at 10:50 AM John Dammeyer
wrote:
> The
On Friday 08 May 2020 10:58:57 Gene Heskett wrote:
> On Friday 08 May 2020 06:59:44 andy pugh wrote:
> > On Fri, 8 May 2020 at 01:23, Gene Heskett
wrote:
> > > If the spindle speed is steady, I have heard of folks doing rigid
> > > tapping with 1 ppr. Ditto g76.
> >
> > You can do G76 with
The BASE_PERIOD value is in nanoseconds and the clue is _PERIOD which is the
inverse of FREQUENCY.
So
1000Hz => 1/1000 = 0.001 or 1000 microseconds.
2000Hz => 1/2000 = 0.0005 or 500 microseconds.
As the frequency gets higher, the period gets smaller.
JOHN
> -Original Message-
>
HI all,
My ancient Acu-rite III DRO has gone flaky. I ordered one off the
following link.
On Friday 08 May 2020 06:59:44 andy pugh wrote:
> On Fri, 8 May 2020 at 01:23, Gene Heskett wrote:
> > If the spindle speed is steady, I have heard of folks doing rigid
> > tapping with 1 ppr. Ditto g76.
>
> You can do G76 with 1ppr, but not, sensibly, rigid tapping.
>
> For rigid tapping you
Jon,
Yours is 24,000 and equals to 41.6667kHz? Mine is 100,000 and equates to 10
kHz. I’m confused by your math here? Thanks.
Sent from my iPad
> On May 7, 2020, at 9:39 PM, John Dammeyer wrote:
>
>
>>
>> From: Dan Henderson [mailto:luvtof...@gmail.com]
>
>> Thanks for that Jon. That
On Fri, 8 May 2020 at 03:42, John Dammeyer wrote:
> Do you know which source code file has the G33.1 control? I'd like to look
> at how it's done.
It's one of the more deeply-embedded ones as it needs to do a lot of
work in the realtime context.
interp:
On Fri, 8 May 2020 at 01:23, Gene Heskett wrote:
> If the spindle speed is steady, I have heard of folks doing rigid tapping
> with 1 ppr. Ditto g76.
You can do G76 with 1ppr, but not, sensibly, rigid tapping.
For rigid tapping you need quadrature to detect the moment of spindle
reversal.
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