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

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. <G>

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