On Mon, 2 Feb 2009, Jim Fleig - CNC Services wrote:
> Date: Mon, 2 Feb 2009 14:56:40 -0500
> From: Jim Fleig - CNC Services <[email protected]>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <[email protected]>
> To: "Enhanced Machine Controller (EMC)" <[email protected]>
> Subject: [Emc-users] PID questions
>
> In conversation with a supplier of motion control products for EMC and Mach3
> the discussion of PID loops arose. The discussion was in the context of
> servo driven systems.
>
> Here is some information that I would welcome others review and comment.
> There are no flames in the following and there is not intent to start any
> flaming. An apples to apples comparison is being sought.
>
> A system has to be chosen for to retrofit a mill that will be cutting 3D
> surfaces. Curve intersecting curve intersecting flat on an angle, etc. I
> have retrofit similar mills with Centroid systems and the users regularly
> program at 100 ipm and observe that the mills average about 60 ipm (as low
> as 10 - 15 ipm in very curvy detail or tight corners and up to 95 ipm on
> almost flat curves and wide open corners). Does anyone have experience with
> EMC or Mach3 achieving the same level of performance as the Centroid system?
> If yes, what configuration was used?
>
> For emc, the PID loops are in the PC software, for Mach3, the PID loops are
> in the motion control hardware.
>
> EMC's PID loop has a cycle rate of 1000 times per second. Is this a fact?
> If yes, are there any options to get the PID loop to run faster? There is
> motion control hardware available for Mach3 that is capable of a PID loop
> with a cycle rate of 5000 times per second.
1 KHZ is just the default EMC servo loop rate, with the right hardware, 10KHz
and above is possible.
SNIP--------------------------------------------------------------------------
>
> Have a good day,
>
> Jim
> ------------------------------------------------------------------------------
Peter Wallace
Mesa Electronics
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(='.'=) This is Bunny. Copy and paste bunny into your
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