Wire EDM Machine Operation Chapter 12
Copyright November, 98 Page 12-3 Sodick Inc.
ANNUALLY
Drain ,clean and refill dielectric tank.
M
M
A
A
I
I
N
N
T
T
E
E
N
N
A
A
N
N
C
C
E
E
D
D
E
E
S
S
C
C
R
R
I
I
P
P
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T
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O
O
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S
S
RESISTIVITY METER
This meter measures the resistance of the deionized water from 0 - 20 and is located
below the chiller. The needle should read between 5 and 10 for most cutting. The red
toggle switch is the on and off switch and must be on to obtain a reading. The P (power)
LED light will light up when the red toggle switch is turned on. Flip the black toggle
switch up and the needle will move toward zero. While holding this toggle switch up,
rotate the ADJ knob to align the needle to zero. Once the needle is aligned with zero,
release the toggle switch and the needle will now display the resistivity of the deionized
water. The high and low knobs located directly below the meter are to set the high (10)
and low (5) limits. There is also a H LED and a L LED. When the L lights up it means
the needle is at a lower reading than what the low knob is set at. This would indicate that
the DI resin is no longer good enough and needs to be changed. When the H lights up it
means the needle is at a higher reading than what the high knob is set at. If the needle
drops below the low knob setting the machine continues to cut. There is not an automatic
shut down feature. If the resistivity gets extremely low (2 or lower) the machine may
think the wire is short circuited. This will throw an alarm stating so and the workpiece
could start pitting (secondary EDMing). So look at the meter everyday and verify the
needle is in the range you have set. There is a probe submerged into the dielectric tank
next to the flushing and fill pump that measures resistance between 2 prongs and relays
the information to the meter. Clean these prongs once a month. See page 1-4 for more
info.
DI BOTTLE:
If the DI bottle needs to be recharged,
1. Turn off the resistivity meter and disconnect the lines at the top of the bottle noting
which one is “IN” and “OUT”. Put the disconnected ends into the dielectric tank so
water doesn’t run onto the floor.
2. Unscrew the blue cap and pull the cap and the rod plugged into it out and rinse the DI
resin off the screens with tap water.
3. Now pour out all the used DI resin from the bottle and rinse the bottle out. The old
resin should be recycled.
4. Pour in new DI resin and fill the bottle about 7/8 of the way up.
5. Push the rod attached to the blue cap down until the cap can be threaded back on.
6. Plug the hoses back on to the bottle and turn on the resistivity meter.
7. If there is a valve on the supply hose (where the hose is connected to) it must be open
to allow water to flow into the bottle. Also make sure the hoses don’t get kinked, thus
blocking the flow.
The meter should return to your setting value in an hour or so.
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