: Lunes, 05 de Enero de 2009 01:34 p.m.
Para: nexan_argent...@arnet.com.ar; Enhanced Machine Controller (EMC)
Asunto: Re: [Emc-users] A wish - Closed Loop Steppers
On Monday 05 January 2009, EDU wrote:
>Gene
> I´m from argentina, i working with Bridgeport machine .
>My machine work wit
ar
Nice site, but I should have learned spanish 65 years ago. :)
>-Mensaje original-
>De: Jon Elson [mailto:el...@pico-systems.com]
>Enviado el: Domingo, 04 de Enero de 2009 08:37 p.m.
>Para: Enhanced Machine Controller (EMC)
>Asunto: Re: [Emc-users] A wish - Closed Loop Steppe
. Your machine lost the step.
Eduardo gonzalez.
www.nexanargentina.com.ar
-Mensaje original-
De: Jon Elson [mailto:el...@pico-systems.com]
Enviado el: Domingo, 04 de Enero de 2009 08:37 p.m.
Para: Enhanced Machine Controller (EMC)
Asunto: Re: [Emc-users] A wish - Closed Loop Steppers
Roger wrote:
> Gene,
> What I was thinking about was using steppers to reliably power big iron on the
> Bridgeport scale. Kelinginc.net sells big steppers (nema 34, 1800 oz) for
> $180. If you add an encoder and a G203V 80 volt/20 amp drive you are under
> $400 per axis.
>
Well, if you restric
On Sun, 4 Jan 2009 17:32:42 + (UTC), you wrote:
>What I was thinking about was using steppers to reliably power big iron on the
>Bridgeport scale. Kelinginc.net sells big steppers (nema 34, 1800 oz) for
>$180. If you add an encoder and a G203V 80 volt/20 amp drive you are under
>$400 per axi
Stephen Wille Padnos wrote:
> Roger wrote:
>
>
>>
> If a step motor loses a step due to excessive loading, then it's likely
> to miss many steps. The one motor will be stalled while the software
> ramps the speed down on the other joints, so the part is already likelly
> to be ruined. At so
On Sunday 04 January 2009, Roger wrote:
>Gene Heskett writes:
>
>Snip
>
>> So have I, but something like that is the exception to the rule. The
>> motors torque was exceeded, yes, but it wasn't moving that fast so it
>> could keep on running. To me that would be a sign telling me I needed
>> big
Roger wrote:
> It's unfortunate that there isn't a way to approximate closed loop control
> with
> steppers and encoders in EMC2. I have read that EMC2 can detect a following
> error using steppers with encoders and trigger a fault which is great but this
> doesn't really allow the use of steppers
sam
- Original Message -
From: "John Harris"
To: "Enhanced Machine Controller (EMC)"
Sent: Sunday, January 04, 2009 10:49 AM
Subject: Re: [Emc-users] A wish - Closed Loop Steppers
> In any feedback motor control system when an torque overload occurs, you
> have
Gene Heskett writes:
Snip
> So have I, but something like that is the exception to the rule. The motors
> torque was exceeded, yes, but it wasn't moving that fast so it could keep on
> running. To me that would be a sign telling me I needed bigger motors and
> drivers. While a bridgeport c
manner.
JohnDHH
- Original Message -
From: "RogerN"
To: "Enhanced Machine Controller (EMC)"
Sent: Sunday, January 04, 2009 8:36 AM
Subject: Re: [Emc-users] A wish - Closed Loop Steppers
> I've thought about trying the following in EMC2. Set up the stepper
On Sunday 04 January 2009, Roger wrote:
>Gene Heskett writes:
>> On Sunday 04 January 2009, Roger wrote:
>> >Stephen Wille Padnos writes:
>
>snip
>
>> Don't forget that a lost step is actually a full step, not whatever
>> microstepping might be setup in the driver. But one lost full step is a
>>
January 04, 2009 9:07 AM
Subject: Re: [Emc-users] A wish - Closed Loop Steppers
Snip
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sou
On Sunday 04 January 2009, Jack Coats wrote:
>A closed loop stepper is not technically difficult. If you have a dual
>shaft stepper, put a Gray scale optical encoder (a two bit encoder would
>work, and 3 bit be more than sufficient I would think) on the
>'non-business' end of the motor. Then have
Gene Heskett writes:
>
> On Sunday 04 January 2009, Roger wrote:
> >Stephen Wille Padnos writes:
snip
> >
> Don't forget that a lost step is actually a full step, not whatever
> microstepping might be setup in the driver. But one lost full step is a
> never happens scenario, cuz if it lose
A closed loop stepper is not technically difficult. If you have a dual
shaft stepper, put a Gray scale optical encoder (a two bit encoder would
work, and 3 bit be more than sufficient I would think) on the
'non-business' end of the motor. Then have some of our magic EMC guru's
add their 'mira
I think that is what the Oriental Motors Alpha steppers do (that may not
be their 'official' name). Shopbot uses them in their 'alpha' series
machines. It basically determines if steps are lost and compensates at
some level.
Roger wrote:
> Stephen Wille Padnos writes:
>
>
>> This is a fun
On Sunday 04 January 2009, Roger wrote:
>Stephen Wille Padnos writes:
>> This is a function of the motor driver, not the control software.
>
>Steve,
>Your absolutely correct but I could imagine how software could be used to
>emulate closed loop control with a step direction drive. In the case of a
Kirk Wallace wrote:
> On Sun, 2009-01-04 at 06:17 +, Roger wrote:
>> It's unfortunate that there isn't a way to approximate closed loop
>> control with steppers and encoders in EMC2. I have read that EMC2 can
>> detect a following error using steppers with encoders and trigger a
>> fault which
On Sat, 3 Jan 2009, Kirk Wallace wrote:
SNIP__
>
> With only step and direction signals on stepper driver inputs, EMC has
> no way of modifying the stepper driver behavior. The driver would need
> something like a step bias or correction input, which EM
On Sun, 2009-01-04 at 06:17 +, Roger wrote:
> It's unfortunate that there isn't a way to approximate closed loop
> control with steppers and encoders in EMC2. I have read that EMC2 can
> detect a following error using steppers with encoders and trigger a
> fault which is great but this doesn't
On Sun, 4 Jan 2009, Roger wrote:
> Date: Sun, 4 Jan 2009 06:17:04 + (UTC)
> From: Roger
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: emc-users@lists.sourceforge.net
> Subject: [Emc-users] A wish - Closed Loop Steppers
>
> It'
Roger wrote:
>Stephen Wille Padnos writes:
>
>
>>This is a function of the motor driver, not the control software.
>>
>>
>Steve,
>Your absolutely correct but I could imagine how software could be used to
>emulate closed loop control with a step direction drive. In the case of a lost
>step s
Stephen Wille Padnos writes:
> This is a function of the motor driver, not the control software.
>
Steve,
Your absolutely correct but I could imagine how software could be used to
emulate closed loop control with a step direction drive. In the case of a lost
step software could lower the axis s
Roger wrote:
>It's unfortunate that there isn't a way to approximate closed loop control with
>steppers and encoders in EMC2. I have read that EMC2 can detect a following
>error using steppers with encoders and trigger a fault which is great but this
>doesn't really allow the use of steppers in la
It's unfortunate that there isn't a way to approximate closed loop control with
steppers and encoders in EMC2. I have read that EMC2 can detect a following
error using steppers with encoders and trigger a fault which is great but this
doesn't really allow the use of steppers in larger or high perfo
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