In a closed loop their is feed back, read about control theory. Stepper motors
are usually run open loop and no feedback is needed although they may loose
steps if not correctly tuned.
Nicklas Karlsson
On Mon, 18 Jan 2016 23:04:05 -0800
Chris Albertson wrote:
> I've read that it is hard to u
Re: OSHPark and gEDA/PCB
I have sent artwork from PCB to OSHPark and received exactly what I sent
them. Problem being exactly what I sent was ... wrong. There were no
circuits on the back side due to me not paying attention to the files I was
renaming. As to OSHPark vs some of the Chinese fab house
Hi Chris,
At my work place, closed loop systems with steppers has been in use for years.
It is a scientific institute and the controller has been developed inhouse.
The controller is doing the step generation based on a demanded position.
Encoder feedback on the real axis is giving the error.
With
Hi Chris,
Wiki defines Servo Motor as a motor that has closed the loop so it knows the
position of the motor.
Years ago there were discussions about closed loop with linear scales. The
trouble there is the amount the motor has to turn before the scales report
data. That can cause oscillations th
Hi Chris!
How about that:
http://catalog.orientalmotor.com/item/all-categories/ories-legacy-products-stepper-motor-drivers-legacy/asd16a-c?cid=1002&prodid=3001170&itemid=63126&backtoname=Item+%23+ASM98ACE&pane=sb&bc=100%7C3001136%7C3001170xx
I use it for a long time.
Regards,
Andrew
Вторни
On 19 January 2016 at 07:04, Chris Albertson wrote:
> I've read that it is hard to use steppers for closed loop CNC. If this is
> still true could some one explain the theory.
This may be a misunderstanding.
It is hard to do anything useful with an encoder attached to a stepper
motor. You can te
On Tuesday 19 January 2016 03:35:32 John Dammeyer wrote:
> Hi Chris,
> Wiki defines Servo Motor as a motor that has closed the loop so it
> knows the position of the motor.
>
> Years ago there were discussions about closed loop with linear scales.
> The trouble there is the amount the motor has t
On 1/19/2016 3:33 AM, Gene Heskett wrote:
> 2 optos in series because the BoB you bought is also an isolated version,
> _will_ hurt you. Particularly if using a PWM output for spindle speed
> control, you _WILL_ have to get rid of it if you want anything that even
> resembles linear speeds so the
On 19/01/16 10:33, Gene Heskett wrote:
> Something that has not been mentioned here is that a real error because
> the stepper has lost a full step or more because it is being asked for
> step movement faster than it can maintain lock.
>
> When that occurs, generally the motor stops/locks, and t
On 19 January 2016 at 11:14, Lester Caine wrote:
>
> The newer 'closed loop' motors are essentially using the same approach,
> but rather than simply applying the same power for longer
I don't think that this is what the original poster was asking. I
think he was just wanting to close a position
Gentlemen,
Having no experience with steppers I will still offer my opinion. Take it
as you will. :)
The case for steppers seems to hinge on cost ie: steppers are less
expensive than servos.
Steppers cannot maintain position like servos because of the aforementioned
lack of increased power if t
On 19/01/16 11:31, andy pugh wrote:
>> The newer 'closed loop' motors are essentially using the same approach,
>> > but rather than simply applying the same power for longer
> I don't think that this is what the original poster was asking. I
> think he was just wanting to close a position loop with
On Tuesday 19 January 2016 06:31:10 andy pugh wrote:
> On 19 January 2016 at 11:14, Lester Caine wrote:
> > The newer 'closed loop' motors are essentially using the same
> > approach, but rather than simply applying the same power for longer
>
> I don't think that this is what the original poster
i was reading the step/servo thread
... this is related but OT
clear me up on in this...
about very slow motion with steppers and servos
assuming the minimum position change is .001mm
( commanded step or feedback unit
so: a single step moves .001"
and any feedback has .001 resolution )
w
On Tue, 19 Jan 2016, TJoseph Powderly wrote:
> Date: Tue, 19 Jan 2016 07:45:02 -0800
> From: TJoseph Powderly
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: "Enhanced Machine Controller (EMC)"
> Subject: [Emc-users] very low speed motion
>
> i was reading the step/servo thread
> .
On 1/19/2016 5:19 AM, andy pugh wrote:
> On 19 January 2016 at 07:04, Chris Albertson
> wrote:
>> I've read that it is hard to use steppers for closed loop CNC. If this is
>> still true could some one explain the theory.
> This may be a misunderstanding.
> It is hard to do anything useful with a
On 01/19/2016 01:04 AM, Chris Albertson wrote:
> I've read that it is hard to use steppers for closed loop CNC. If this is
> still true could some one explain the theory.
Stepper drivers have fixed current settings for the
windings. When the load increases, the voltage applied by
the driver may
On 01/19/2016 09:45 AM, TJoseph Powderly wrote:
>
> clear me up on in this...
> about very slow motion with steppers and servos
>
> assuming the minimum position change is .001mm
> ( commanded step or feedback unit
> so: a single step moves .001"
> and any feedback has .001 resolution )
>
On 01/19/2016 10:24 AM, Peter C. Wallace wrote:
>
> What I think happens in a step /dir system is this:
>
> Linuxcnc uses floating point numbers for positions and velocities and these
> vary in a stepwise manner at the the servo thread period. If you command a
> move with a .001 mm/sec velocity and
> into the rotor. Microstepping also increases resolution by
> a small amount. But, I am convinced Mariss Freimanis is
> correct that microstepping more than about 10:1 really
> provides no benefit. A stepper motor can be modeled as a
> mass (the rotor and external load) controlled by a spring
>
I am using Axis in lathe mode and the view buttons that are normally there, at
least on my mill and plasma machine, are missing in Axis’ tool bar and View
Menu (2.7.3) . Is there a way to get them to show up?
-Tom
--
S
Change the mode back to mill.
JT
On 1/19/2016 5:11 PM, tom-...@bgp.nu wrote:
> I am using Axis in lathe mode and the view buttons that are normally there,
> at least on my mill and plasma machine, are missing in Axis’ tool bar and
> View Menu (2.7.3) . Is there a way to get them to show up?
>
Greetings;
Finally making the tach, Sp PWR (was the on-led), the fwd and reverse
leds talling what going on, the next step is to make camview-emc work
again as it stopped working when I update to the hybrid.iso, which is
mostly wheezy.
I sent an email to the address in the README, asking if a
Is there a way to bring them back in Lathe mode? It is a lathe I am using it
on so want to keep that mode, but want the buttons so I can get the view back
on the screen after touching off.
-Tom
> On Jan 19, 2016, at 6:22 PM, John Thornton wrote:
>
> Change the mode back to mill.
>
> JT
>
>
> From: tom-...@bgp.nu
> Date: Tue, 19 Jan 2016 20:17:55 -0500
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] View buttons and views in Axis menu gone in lathe
> mode
>
> Is there a way to bring them back in Lathe mode? It is a lathe I am using it
> on so want to keep tha
> From: ghesk...@wdtv.com
> To: emc-users@lists.sourceforge.net
> Date: Tue, 19 Jan 2016 19:37:01 -0500
> Subject: [Emc-users] camview-emc?
>
> Greetings;
>
Gene would this be any use to you?
https://forum.linuxcnc.org/forum/show-your-stuff/30006-spindle-cam?limitstart=0
It may be easier to k
On Tue, Jan 19, 2016 at 08:17:55PM -0500, tom-...@bgp.nu wrote:
> Is there a way to bring them back in Lathe mode? It is a lathe I
> am using it on so want to keep that mode, but want the buttons so
> I can get the view back on the screen after touching off.
Hit `v'?
---
Mainly I want a button that brings the back plot to the center after touching
off. Currently the view is looking down the Y axis at the ZX plane of the
lathe. When you touch off the view disappears off screen. Then we roll the
center button (usually initially in the wrong direction) until we
On Tuesday 19 January 2016 20:41:50 Chris Morley wrote:
> > From: ghesk...@wdtv.com
> > To: emc-users@lists.sourceforge.net
> > Date: Tue, 19 Jan 2016 19:37:01 -0500
> > Subject: [Emc-users] camview-emc?
> >
> > Greetings;
>
> Gene would this be any use to you?
> https://forum.linuxcnc.org/forum/s
On 01/19/2016 06:37 PM, Gene Heskett wrote:
> Greetings;
>
>
> I sent an email to the address in the README, asking if a fix for wheezy
> had been done, this about 24 hours ago, but no reply has been received
> yet.
>
> Is anybody else any smarter about this than I am?
>
> I have 2 ea 13watt daylig
On 01/19/2016 06:37 PM, Gene Heskett wrote:
(Darn, hit the wrong button again...)
> the next step is to make camview-emc work
> again as it stopped working when I update to the hybrid.iso, which is
> mostly wheezy.
>
UGH! Camview is a TOTAL can of worms. I DID manage to get
it working on two sy
On Tuesday 19 January 2016 22:02:13 Jon Elson wrote:
> On 01/19/2016 06:37 PM, Gene Heskett wrote:
>
> (Darn, hit the wrong button again...)
>
> > the next step is to make camview-emc work
> > again as it stopped working when I update to the hybrid.iso, which
> > is mostly wheezy.
>
> UGH! Camvie
On 01/19/2016 10:25 PM, Jon Elson wrote:
> On 01/19/2016 09:30 PM, Gene Heskett wrote:
>> On Tuesday 19 January 2016 22:02:13 Jon Elson wrote:
>>
>>>
>>> UGH! Camview is a TOTAL can of worms.
>> Burns a huge hunk of cpu time when its running, so you have to creep up
>> on the target at about 5 tho
On 01/19/2016 09:30 PM, Gene Heskett wrote:
> On Tuesday 19 January 2016 22:02:13 Jon Elson wrote:
>
>>
>> UGH! Camview is a TOTAL can of worms.
>
> Burns a huge hunk of cpu time when its running, so you have to creep up
> on the target at about 5 thou a minute because its so slow at getting
> you
On 1/19/2016 11:55 AM, John Dammeyer wrote:
>> into the rotor. Microstepping also increases resolution by
>> a small amount. But, I am convinced Mariss Freimanis is
>> correct that microstepping more than about 10:1 really
>> provides no benefit. A stepper motor can be modeled as a
>> mass (the
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