Castle TSM-21 Serial 64234 and above (Bosch) Operator Manual - Manual (Page 34)

CASTLE, INC TSM-21 OWNERS MANUAL V2.0 Page 34 of 41
• Without depressing the spring plate, the switch should register as an open circuit. When
depressing the plate, the switch should register as a closed circuit (approximately 0 ohms).
• If an open circuit is still registered, then a new switch should be installed.
7.4 Pressure Regulator
The Pressure Regulator determines the Drill Feed rate and overall speed of the machine. It’s
important that at least 80 PSI is going into the machine from the compressor. Other machines on
the same line as your Castle machine can affect this pressure.
Note: Do not adjust the internal Pressure Regulator unless absolutely necessary.
The internal Pressure Regulator knob is located on the Control Box, just below the duplex power
outlet for the Router and Drill motors. (Fig 26) If in doubt whether the internal Pressure
Regulator is set correctly, follow the steps described below:
• Unlock the knob by pulling it slightly away from the Control Box.
• Turn the knob counter-clockwise until it reaches a mechanical stop.
• Turn the knob clockwise five full revolutions (it’s helpful to make an index mark on the knob
as a reference.)
• Lock the knob by pushing it slightly toward the Control Box.
Fig 26
Note: Cycling too slow will burn drill bits and cause separation at the shank. Cycling
too fast will put too much pressure on the drill bits and cause them to break and/or cut
over-size holes.