Your setup sounds very much like my Anilam setups. Tach feedback to
drives, encoder feedback to controller, +&-10V velocity command signal
from controller to drive. I used a Mesa 5i20 ($199) and 7i33 ($69), I
also use a 7i37(69) for I/O. I was originally looking at the Motenc
Lite card but the Mesa hardware saved me a good deal of $ and works
----- Original Message -----
From: "Gerhard Pircher" <gerhard_pircher@...>
Sent: Wednesday, September 05, 2007 5:46 AM
Subject: [Emc-users] Need advice on building a mill controller with EMC2
I'm seeking for some comments about how to build a mill controller with
EMC2, as I'm completely new to this topic.
I got a 12 years old desktop mill, which was manufactured by KERN-
Microtechnic . The machine is in a very good condition, but some
of the original mill controller (a rack mounted controller manufactured
by NUM) are missing and most of the documentation is lost. Thus it was
not possible to get the old controller operational again and EMC2 seemed
to be a reasonable alternative to a commercial product.
First a few technical details about the desktop mill. It should have a
resolution or 5µm, whereas switches allow to detect the point of origin
and Haidenhain rulers deliver a quadrature signal for relative position
measurement. The mill is equipped with Faulhaber DC servo motors  for
the X/Y/Z axis, which are coupled to tacho-generators .
I thought about using VitalSystem's MOTENCLite PCI  card. It's analog
outputs should drive a DC servo amplifier  through a standard +/-10V
interface. The tacho-generators will be used to regulate the velocity of
the DC servo motors, which is set by EMC2 (the servo amplifier
the closed loop control).
Three of the 4 quadrature inputs of the PCI card will be connected to
the Haidenhain rulers  and the generic digital inputs will be used
the switches to detect the point of origin.
Since I don't know much about EMC2 yet, I would like to know, if my
(early) concept is feasible and what should be considered when building
mill controller with EMC2. It would also be nice, if a MOTENCLite user
can share his experiences with this card.
Thanks in advance!
 http://kern-microtechnic.com - German only
 http://www.heidenhain.de/wcmsmimefiles/208_961_24_16952.PDF, page 44
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