User Manual

5
Fuse Protection:
The transformer and control circuit board are protected from power line
current surges or shorts by a 1.5 Amp fuse in fuse holder in rear panel of
control (see Figure 2, page 3). It can be checked or replaced by unscrewing
cap and inserting a new fuse if necessary.
MH-145A Micro Motor Handpiece:
The MH-145A Micro Motor Handpiece is intended only for fine finishing
and detailing work. It should not be used to remove large amounts of
material in carving or other applications. If the handpiece is misused
or abused, it will not be covered under warranty.
Changing Accessories:
Burs and other accessories can be inserted or removed from the
handpiece collet when the collet is open.
To open the collet–
1. Put the power switch on control box in OFF position and wait for
handpiece to stop rotating.
2. Twist locking ring toward “R” until collet snaps open.
3. Insert shank of accessory fully (about 1
1
⁄
8
″) into collet for
maximum support.
4. Twist knurled grip toward “S” until it snaps to lock collet.
Never turn power on to handpiece when collet is open. The spindle is in
a locked position and will not turn which will result in damage to the motor.
Collets Available for the MH-145A Handpiece:
Part No. HP813516: 3/32″ (2.35mm) Collet (supplied)
Part No. HP813517: 1/8″ Collet (supplied)
Part No. HP813518: 3mm Collet (optional)
Collet Adapters:
Use collet adapters with different shank size accessories without having to
change collets.
Accessory
Collet Size Shank Size
Part No. HPLA-3234: 1/8″ to 1/16″ 1/16″
Part No. HPLA-3235: 3mm to 3/32″ 3/32″
Part No. HPLA-3236: 1/8″ to 3/32″ 3/32″
Installing/Changing Collets:
The 1045 Micro Motor Kit comes with a 3/32″ collet in your handpiece and a
1/8″ collet that is quick and easy to install with the collet changing wrench
shown below in Figure 3.
1. Twist locking ring
on handpiece
toward “R” position
until collet snaps
open. In this open
position, the spindle
remains locked in
place and cannot
spin freely.
2. Place collet changing wrench over front of collet with triangle shaped hole
aligned as shown in Figure 4.
3. Loosen collet by turning wrench counterclockwise while looking down on
the upturned handpiece like a clock face. Remove collet.
4. Insert new collet. Finger tighten down in a clockwise motion until you
meet some resistance. Apply wrench and continue making several more
turns for a secure fit.
Caution: Collet must be tightened with a wrench until it cannot be
turned farther. This will involve several turns beyond the initial
perceived spot of resistance achieved by finger tightening. If collet
is too loose or absent, spindle will not turn.
6
Figure 4
Figure 3
Locking ring
Collet changing
wrench
1/8″ collet
3/32″ collet
installed in
handpiece