This sounds very similar to the plasma Torch Height Control.
On plasma cutting the arc voltage is monitored in order to keep the distance
constant.
I would use an analogue/inductive/capacitive Probe (as Ken suggested), and set
up a PID to keep position using HAL.
It would be very similar to the example in the wiki:
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Torch_Height_Control
As for G-code I suppose you could use normal G-code, and maybe 1-2 custom M
codes to turn on/off the tracking at the right height.
Best regards,
Alex
----- Original Message -----
From: Michael Dubno
To: Enhanced Machine Controller (EMC)
Sent: Sunday, January 28, 2007 4:30 AM
Subject: Re: [Emc-users] Is there an easy way to work withanirregular surface?
Any idea of what the G code would look like?
------------------------------------------------------------------------------
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Kenneth Lerman
Sent: Saturday, January 27, 2007 9:30 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Is there an easy way to work with anirregular
surface?
I once used a device that added a hydraulic knee to a bridgeport. A probe
mounted on an arm actuated it. When moving the table in X and Y, the probe
caused the knee to raise and lower so as to keep the probe in contact with the
surface of the object. This, in turn, caused the cutter to cut the stock to the
proper depth.
That was around forty years ago.
If you mounted an electrical probe parallel to the head in that way, you
could do the same thing with EMC. The state of the probing command in EMC2 is
uncertain, though.
Ken
[EMAIL PROTECTED]
Mark Kenny Products Company, LLC
55 Main Street Voice: (203)426-7166
Newtown, CT 06470 Fax: (203)426-9138
http://www.MarkKenny.com
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Michael Dubno
Sent: Saturday, January 27, 2007 6:32 PM
To: [email protected]
Subject: [Emc-users] Is there an easy way to work with an irregular surface?
I would like to automate the cutting of objects found in nature that are
roughly spherical and vary in radius. What seems to make sense is to issue a G
code command to make the cutting head move until a limit switch is triggered on
the surface of the object; disable the limit switch; use relative motion
commands; repeat. Has anyone encountered anything like this? Is there a way to
do what I'm attempting without scanning the entire object first?
Thanks - Mike
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