On Friday 10 July 2020 01:13:12 Peter C. Wallace wrote:
> On Thu, 9 Jul 2020, John Dammeyer wrote:
> > Date: Thu, 9 Jul 2020 22:02:31 -0700
> > From: John Dammeyer
> > Reply-To: "Enhanced Machine Controller (EMC)"
> >
> > To: "'Enhanced Machine Controller (EMC)'"
> > Subject: [Emc-users] Sp
Thanks Peter,
Wasn't sure if there was an easier way. I cut and pasted the example from the
doc page but it's in the wrong place and LinuxCNC does start. For now it's all
commented out.
So I have to figure out what I need to 'fix' in the hal file so it uses the
limit component properly.
On Thu, 9 Jul 2020, John Dammeyer wrote:
Date: Thu, 9 Jul 2020 22:02:31 -0700
From: John Dammeyer
Reply-To: "Enhanced Machine Controller (EMC)"
To: "'Enhanced Machine Controller (EMC)'"
Subject: [Emc-users] Spindle acceleration/decelleration
My ini file these parameters.
MAX_VELOCITY =
My ini file these parameters.
MAX_VELOCITY = 50.0
MAX_ACCELERATION = 300.0
Setting MAX_ACCEL to 30 doesn't change the rate of change from 3000 RPM to 0.
Still goes from 10V to 0V in 80 mS.
In the HAL file these set up the MESA for speed to RPM. But I seem to have
missed an acceleration.
How to generate pulse at the exact rate you need...
First make a loop that runs as fast as you can make it run. The first
thing it does is "sleep" for a hundred or so microseconds. Then it checks
the time of day and to see if it is time yet to do the next pulse. If not
it fall to the end of the
Stepper motors are called that because they move in steps. Usually they have
two coils. Both coils are powered when the motor is powered on, and this is
what holds the motor in position. Reversing the current to one of these coils
will advance the motor to the next step. The direction the motor
On 7/9/20 6:47 PM, Chris Albertson wrote:
OK, got it a "Dob, on a Ea, platform and the platform on an Az, El mount.
Yup.
Again PWM is "Pisle Width Modulation" Steppers and stepper drivers don't
use PWM. They use what we cal "Pulse/Direction"
I didn't know that, I read the product manual
On Thursday 09 July 2020 20:32:42 Gene Heskett wrote:
> > > Steppers aren't pwm driven, so ignore that. But a 48 volt supply
> > > is pushing the ratings of a DM542 which is 50 volts max, and you
> > > would be wise to adjust it a few volts lower. I have a pair of 7.5
> > > amp 48 volt supplies r
Gene,
Belts are a good idea for the Ax and El axis but in the Eq axis he needs
something on the order of 100:1 reduction
The time tested traditional method is a synchronous AC moter and a VFD that
can do 60 Hz +/- about 5 percent. This axis turns only 1 rev per day but
the step need to be less t
OK, got it a "Dob, on a Ea, platform and the platform on an Az, El mount.
Again PWM is "Pisle Width Modulation" Steppers and stepper drivers don't
use PWM. They use what we cal "Pulse/Direction"
PWM uses a constant square wave rate like that is always between 60 Hz and
maybe up to 1,000 Hz. Wh
On Thursday 09 July 2020 19:05:45 R C wrote:
> Hello Gene,
>
>
> To start with the end of your reply, I actually am a mathematician
> :)
>
> On 7/9/20 4:24 PM, Gene Heskett wrote:
> > On Thursday 09 July 2020 14:23:57 R C wrote:
> >> Hello,
> >>
> >> this is (probably) off topic, been seen that
I am not using linux cnc, I am just 'driving' the stepper drivers
with a raspberry pi
I figured, same hardware (drivers, motors), "Linux CNC" can use it, so
thought I'd just ask here about the internals/specifics and how to use it.
On 7/9/20 1:44 PM, andy pugh wrote:
On Thu, 9 Jul 202
Hello Gene,
To start with the end of your reply, I actually am a mathematician :)
On 7/9/20 4:24 PM, Gene Heskett wrote:
On Thursday 09 July 2020 14:23:57 R C wrote:
Hello,
this is (probably) off topic, been seen that happen. If it is please
ignore it.
I am building a "motorized" tel
On 7/9/20 1:44 PM, andy pugh wrote:
On Thu, 9 Jul 2020 at 19:26, R C wrote:
The stepper motors I use with a stepper driver, those common DM542 ones,
the stepper motors themselves are 2A and 1.8 degrees per step.
...
As with PWM itself, I am probably just not too familiar with it.
Do you me
On Thursday 09 July 2020 14:23:57 R C wrote:
> Hello,
>
> this is (probably) off topic, been seen that happen. If it is please
> ignore it.
>
>
> I am building a "motorized" telescope mount (dobsonian) with what is
> called an equatorial platform, it has 3 axis which I am going to drive
> with s
there will be worm gears, and those will just gear all the axis/axes
down down.
On 7/9/20 1:23 PM, Chris Albertson wrote:
Telescopes are something I know a little about, What you don't tell us and
what matters quite a lot is the mechanical gearing. How are the
motors connected to the mount?
> On Thu, 9 Jul 2020 at 09:58, N wrote:
>
> > It's in e09ae64fb0a76355b4f559e28c91a29fb25af8ce but did not see it in old
> > 2.8 version bef8d9d525b9d483a4cf97a1040289d1aaddc74f
>
> That's a big gap:
> https://github.com/LinuxCNC/linuxcnc/compare/bef8d9d525b9d483a4cf97a1040289d1aaddc74f...e09ae
On Thu, Jul 9, 2020 at 12:47 PM andy pugh wrote:
> On Thu, 9 Jul 2020 at 19:26, R C wrote:
>
> > The stepper motors I use with a stepper driver, those common DM542 ones,
> > the stepper motors themselves are 2A and 1.8 degrees per step.
> ...
> > As with PWM itself, I am probably just not too fa
On Thu, 9 Jul 2020 at 19:26, R C wrote:
> The stepper motors I use with a stepper driver, those common DM542 ones,
> the stepper motors themselves are 2A and 1.8 degrees per step.
...
> As with PWM itself, I am probably just not too familiar with it.
Do you mean PWM?
Stepper drivers take step a
On Thu, 9 Jul 2020 at 09:58, N wrote:
> It's in e09ae64fb0a76355b4f559e28c91a29fb25af8ce but did not see it in old
> 2.8 version bef8d9d525b9d483a4cf97a1040289d1aaddc74f
That's a big gap:
https://github.com/LinuxCNC/linuxcnc/compare/bef8d9d525b9d483a4cf97a1040289d1aaddc74f...e09ae64fb0a76355b4f
Telescopes are something I know a little about, What you don't tell us and
what matters quite a lot is the mechanical gearing. How are the
motors connected to the mount?
If this is an equatorial mount what are there three motors? and why care
much about if declination moves smoothing as it is on
Hello,
this is (probably) off topic, been seen that happen. If it is please
ignore it.
I am building a "motorized" telescope mount (dobsonian) with what is
called an equatorial platform, it has 3 axis which I am going to drive
with stepper motors.
The stepper motors I use with a steppe
> On Tue, 7 Jul 2020 at 22:14, N wrote:
>
> > I do not consider it a big problem and will probably connect other jogging
> > method once machine is up and running but as it worked in old version it
> > would of course be good to get it perfect again.
>
> https://github.com/LinuxCNC/linuxcnc/co
Compile does not work with yapps2 requiring python3 ?
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> On Tue, 7 Jul 2020 at 22:14, N wrote:
>
> > I do not consider it a big problem and will probably connect other jogging
> > method once machine is up and running but as it worked in old version it
> > would of course be good to get it perfect again.
>
> https://github.com/LinuxCNC/linuxcnc/co
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