Please, I did not in any way mean to be unfair to EMC. I did not mean it
in that way at all.
EMC is a fantastic program.
What I mean is that by doing the electronic gearing there is no way to
avoid a condition where a stepper motor is operating at a step rate where
resonance is present. It will happen and there is not anything EMC can do
to prevent it. Its just a condition of steppers that cannot be avoided.
It's hard to read E-mail and not have the writing be taken in the wrong
way. Don't take my comments to be bashing EMC in any way. It has been
everything I have been looking for in CNC control. I have no issues with
EMC at all. It's a fantastic package and there has been a ton of work put
into it.
Jim C
Gene Heskett
<[EMAIL PROTECTED]
izon.net> To
Sent by: "Enhanced Machine Controller (EMC)"
emc-users-bounces <[email protected]>
@lists.sourceforg cc
e.net
Subject
Re: [Emc-users] Stepper speed
03/10/2008 09:38
AM
Please respond to
"Enhanced Machine
Controller (EMC)"
<[EMAIL PROTECTED]
sourceforge.net>
On Monday 10 March 2008, [EMAIL PROTECTED] wrote:
>Kirk,
>
>Yes, I have used the dampers and they work well. My motors at home don't
>have the dual shafts. I made due with some old motors. Things are
working
>well for me right now without them. I could run faster if I had them on
>the motors.
>
>Here are work, I have seen the results and it's not pretty. Steppers do
>have a lot of oscillations during stepping. There is always a resonant
>speed where torque falls way off.
>With the electronic gearing of EMC,
>there is no way to avoid this condition.
This statement is grossly unfair to emc. This problem will exist for
stepper
motors regardless of the driver software chosen.
>One just has to make sure there
>is still enough torque to continue the motion without breaking the phase.
>
>Jim C
>
>
>
>
> Kirk Wallace
> <[EMAIL PROTECTED]
> company.com> To
> Sent by: "Enhanced Machine Controller (EMC)"
> emc-users-bounces <[email protected]>
> @lists.sourceforg cc
> e.net
> Subject
> Re: [Emc-users] Stepper speed
> 03/07/2008 03:13
> PM
>
>
> Please respond to
> "Enhanced Machine
> Controller (EMC)"
> <[EMAIL PROTECTED]
> sourceforge.net>
>
>On Fri, 2008-03-07 at 14:19 -0500, [EMAIL PROTECTED] wrote:
>> Ian,
>>
>> I am using the basic output from HAL via a 1284 parallel printer port,
>> (mode 2). The stepper motor drivers are just doing the chopping to
limit
>> current. I didn't change HAL in any way.
>>
>> The one thing you might try is to limit the acceleration.
>>
>> I was surprised when I raised the motor voltage and started missing
>
>steps.
>
>> That was not at all what I expected. I am driving a 2.5mm pitch lead
>
>screw
>
>> with 1.8 degree steppers (NEMA 14)
>>
>> Jim Combs
>> Lexington, Ky
>
>Others on this list have used mass and/or fluid dampers to deal with
>stepper resonance problems.
>
>I wonder if a high resolution encoder and Halscope could be used to
>study inter-step movement at speed? Maybe running on another EMC PC?
>
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
I'd put my money where my mouth is, but my mouth keeps moving.
-- Larry Wall in <[EMAIL PROTECTED]>
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