RE: [CAD_CAM_EDM_DRO] Relation of a DRO to a CNC modification of a machine?

Andy ,

Wouldnt it be nice if Mach2 would keep an eye on the machine position and secondary rotary encoder or linear scale position? Then report an error if they are out of sync or maybe correct it self and tell you it did. 2 encoders per servo? Seems like they should be able to use the existing encoder and make it a true closed loop system. Mine never loses position but in the event that it did it would be nice to know.

Ron

Andy Wander <awander@...> wrote:
Mach2 can also accept the inputs from real quadrature-type scales to show
the axis positions on-screen. These inputs from the scales are NOT used by
the controller, though, they are informational only.

Andy Wander
Verrex Corporation


-----Original Message-----
From: Alan Rothenbush [mailto:alan@...]
Sent: Monday, September 27, 2004 2:58 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Relation of a DRO to a CNC
modification of a machine?

Gary;

As the fellow owner of a CNC'd 3in1 machine, I feel it my duty to pipe
up.

If your DRO is the type that uses the standard Chinese "legless
caliper" type of scale, no, your DRO cannot be connected to the CNC
system.

However, if your DRO is a more standard type, where the output of the
encoders is conventional quadrature, then there IS a way use the
feedback from the DRO to the CNC system to "compensate". You'll need
(beside the DRO)

a. a "Kulaga/Mauch" DRO input board
b. a PC with an ISA connector to accept the above board, and
c. either EMC or DeskNcRT software (there may be others I'm unaware
of)

(I'm building exactly such a thing right now for my little Taig mill,
as I hope to make simple PCBs and .010" just isn't close enough.)

Hope this helps.

Alan




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