DCM-161 MINI TUMBLE BLAST CABINET
Page 5
4.2 Timer
4.4
Door Interlock, Figure 4
4.2.1
Set the timer for the duration of the blast cycle.
Blasting automatically stops when the timer times out.
Trial and error will determine the timer setting for the
most favorable results. After the part is correctly
processed, make a note of the total blast time for future
runs of similar parts.
4.3
Media/Air Mixture, Figure 3
4.3.1
Observe media flow through the clear media
hose. Media should flow smoothly and evenly through the
hose.
4.3.2
If the air exiting the nozzle pulses or if media does
not flow smoothly, the metering valve requires adjusting.
To adjust: loosen the locking nut, and adjust the metering
screw until the upper holes in the metering stem are
closed-off, and the lower holes are fully open. See Figure
3. This adjustment is a starting point.
Figure
3
4.3.3
If pulsation occurs in the media hose, either media
is damp and caked, or not enough air is entering the
media stream. While blasting, loosen the locking nut and
slowly turn the adjusting screw out (counterclockwise
when viewed from the top) until the media flows smoothly.
Tighten the locking nut to maintain the setting.
4.3.4
If media flow is too light, decrease air in the
mixture by turning the metering screw in (clockwise when
viewed from the top) covering more of the holes so less air
enters the media hose. Tighten the locking nut to maintain
the setting.
Never attempt to override the interlock system.
Doing so could result in injury from unexpected
blasting.
WARNING
4.4.1
The door interlock disables the blasting control
circuit when the door is open. To enable blasting, the
door interlock switch must be engaged when the door is
closed. The interlock is set at the factory and does not
usually require field adjustment unless parts are
replaced. When adjustment is required, proceed as
follows.
Figure 4
Adjusting Screw
Adjust the screw to engage
the switch when door is
Cabinet Door
Interlock Switch
Upper holes
fully closed
Locking Nut
Lower holes
fully open
Adjusting Screw
4.4.2
Close cabinet door.
4.4.3
Loosen the adjusting screw nut.
4.4.4
Center the screw on the switch, and turn the
adjusting screw in or out as required to engage the
switch without applying excessive pressure. Tighten the
adjusting screw nut.
4.4.5
Test the operation with the door open only
enough to disengage the interlock switch, and then
again with the door closed. The interlock should stop the
blasting when the door is opened, and permit blasting
when the door is closed.
