Wire EDM Machine Operation Chapter 12
Copyright November, 98 Page 12-7 Sodick Inc.
clockwise for maximum pressure and open the valve 1-2 turns counterclockwise to obtain
enough flow. If the wire will not enter into the brass unit that the pipe is attached to ,
remove the hex shaped cap located on the top of the unit and remove the preguide inside.
This preguide may get plugged up with brass dust. Clean the guide, install it and install
the cap and feed the wire through the threader. The optimum location for the end of the
pipe when it goes down to thread the wire, is about .5" above the lower wire guide. If the
pipe cannot fit into the start hole in the workpiece, set the end of the pipe about .050"
above the part and tighten the stop in this location and the threading jet will shoot through
the part to the lower guide. When the stop is all the way down and the pipe moves down
to contact it, if the head is high up because the part is thick, the end of the pipe is several
inches above the lower guide.
In this case, the worktank will need to be drained, otherwise the jet will break up as it
tries to push through more than about 1" of standing water. See page 12-12 for the AWT
in oil (sec) parameter explanation of how to drain the worktank for the thread cycle.
There is a small knob located near the top left side of the threader that affects the closing
pressure between the drive rollers. The deep slot creates less pressure and the shallow slot
creates more. Use the deep slot for .006” or smaller wire, and use the shallow slot for
.008” and larger wire.
WIRE CUTTER:
The wire cutter unit is located above the upper head. There are 2 carbide discs and one of
them slides to shear the wire during the cut cycle. These discs last for a very long time.
Thousands of cuts can be done before they need to be replaced. After the wire has been
cut, verify that there is not a burr on the end of the wire. If there is, replace both discs
with new ones. To replace the discs, remove the threading pipe and loosen the 2 screws
on the top of the retaining plate on the cutter assembly. Carefully remove the top plate
and note location of the wave washer and position of the 2 discs.
LOW AND HIGH FLUSHING KNOBS:
These knobs are located below the resistivity meter. They control the RPM of the
flushing pump when in high or low flushing mode. Generally the high should be rotated
so the white line is at the 5 o’ clock position which gives maximum pressure. The low
should be at the 10 o’clock position, which will create enough pressure for skim cutting.
These knobs work in conjunction with the flow meters located at the front of the
machine. The red digital readout facing the front of the machine, near the resistivity
meter, shows the frequency or RPM of the flush pump when in high or low flushing
mode. Use this readout to track flushing pressure since the numbers change as the knobs
are rotated.
LOW set to 20Hz (should get 1 Liter / minute flow).
HIGH set to 60Hz
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