On Sat, 12 May 2007, Kasparov, Aram wrote:
> Date: Sat, 12 May 2007 03:04:50 -0700
> From: "Kasparov, Aram" <[EMAIL PROTECTED]>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <emc-users@lists.sourceforge.net>
> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>,
> "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
> Subject: [Emc-users] Laser type encoder.
>
>
>
>
> Hello everyone.
>
>
>
> I am building mid size gantry type machine that will use EMC2.
>
> To home machine and know actual position of the machine in any given moment
> I want to use laser base measurement tool.
>
> In other word I want to use standard laser distance measurement tool, that
> will give me XYZ distance from the home position (or with fixture offset
> G55), and I want convert that data to the format to I can use it as a
> encoder data to plug it into EMC2.
>
> I want replace encoder with the laser measurement tool.
>
> There are good reason for that and particular to large machine that do not
> have high frame rigidity. By having encoder data coming from external
> measurement, that is not depend on tool pressure and machine frame
> flexibility, I can do/(I hope) high precision job with large and light type
> of machine.
>
> Does any one know from where I need start?
>
>
>
> Thank you,
>
> Aram
Dont throw away your encoders just yet...
For this to work at all you will probably require dual feedback. (from both
rotary encoders on motors and laser measurement)
Also if your frame is not rigid, and you have dynamic load changes (Not a
laser or Plasma cutter) so the laser sensor feedback loop needs relatively
high bandwidth, Its unlikely a simple PID loop will be stable, and state
variable or other more exotic control techniques would be needed.
Peter Wallace
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