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EDM Support
The early CHMER Sinkers did not actually have a regulated
power supply for the generator like the newer models. Low
Q: We moved to a new facility. Our model CM323C EDM
voltage will reduce the cutting voltage, which should be
machine, which we purchased new in 2000, is suddenly
around 95 VDC. If the incoming voltage is 10% under 220
VAC, then the 95 VDC cutting voltage will be under by 10%!
taking longer to cut. What could be the problem?
A: Many customers do not realize how important it is to
the voltage is high, there is the possibility of damaging
have the correct incoming voltage. Most of our machines
some of the electrical components!
are set up to run 220 VAC 3 Phase. When I ask customers You could also see problems like relays not pulling in. If
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The best thing to do is measure and advise the service
before installation what their voltage is, I normally get 220.
Very few people have the exact voltage that the electric
department what you found to see if a transformer or
voltage regulator is required. If you do not advise the
company supplies.
service department in advance, it will cause a delay in your
installation or additional cost to fi nd the correct device to
correct the power concern.
Also – If you plan on using a device to convert 1 phase to
3 phase, it is important to advise them of the type you are
using to make sure it is compatible with your machine.
Larry McNamee
EDM Support, Inc.
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Q: How do I get the maximum life out of my feed and
pinch rollers on my FANUC Wire EDM?

A: Indexing the rollers on a regular basis is the key to long
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life of your rollers. Indexing the wire also helps prevent
the wire from curling, which is always a result of a groove
on the rollers. On the older A & B series machines, there
is not an easy way to accomplish this. It was not until the
CM323C
C series machines that a relatively easy way to index the
I have seen the incoming 220 v 3 phase go as low as 198
wire on the rollers was made by FANUC.
and as high as 238! It is important to measure the voltage
A & B series: The feed roller cannot be rotated, but the
and not assume. Take measurements in the morning, at
pinch roller can be. The cost of the feed roller has increas-
noon and at the end of the day.
Normally you measure the 3-phase voltage phase to
the wire on the roller is to place a shim between the plastic
Wire Guide and the Feed Panel. I have seen a penny used
phase not phase to ground. You should have 3 voltage ingly become more expensive and the only way to index
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several times, and that does seem to be a viable (and inex-
measurements when done.
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