right, a hammer symbol will be visible to the left of the switch. The drill now adds an impact function to
the drilling rotation. The impact function greatly speeds up the drilling of cement-based materials such
as mortar, concrete, brick and block. Use this function only with carbide tipped masonry bits designed
for hammer drills. Variable speed drills operate at any speed from 0 to maximum RPM shown on the
name-plate. The pressure you apply to the trigger controls the speed. Apply more pressure to increase the
speed and release pressure to decrease speed. This accurate speed control enables you to drill without
center punching. It also permits you to use the drill as a power screwdriver. Using the knob located in
the trigger switch (speed control button) can control maximum RPM. Rotating the knob counter
clockwise decreases maximum RPM. Rotating the knob in a clockwise direction increases the maximum
RPM. Use this speed control when you need a specific speed and want to use the lock button. The lock
button is located to the right of the trigger switch in the handle. The lock button allows continuous
operation at maximum RPM without holding the trigger. To activate, pull the trigger back, press the lock
button and release the trigger. To stop the drill, pull the trigger and then release finger pressure. This
feature is convenient on long jobs such as sanding or polishing and when using the drill in a drill stand.
WARNING Do not use the lock button on jobs, which require stopping the drill suddenly to prevent
possible loss of control.
The reverse lever over the trigger permits changing the direction of the rotation of the accessory. The
speed control trigger and lock button u ill operate in either direction. Moving the switch to the right
rotates the accessory in a clockwise (forward) manner. Moving the switch to the left changes the rotation
to counter clockwise (reverse). CAUTION To prevent damage to the tool the drill must be completely
stopped before moving the reverse lever.
The auxiliary handle included with your drill is used to provide safe control and ease of operation.
Place the clamp in the desired position on the front housing collar of your drill. Secure the clamp with
the wing nut provided. Be sure to put the depth guide in the hole next to the wing nut before tightening
the wing nut.
The chuck key is located on the power cord and is readily accessible.
To insert bits, open the jaws of the chuck enough to insert the bit. For small bits, insert up to the flutes,
for large bits, insert the bit as far as it will go. Center the bit as you close the jaws by hand. Use the
chuck key for final tightening.
TIPS
You will extend the life of your drill bits and do neater work if you always put the bit in contact with the
work before pulling the trigger. During the operation, hold the drill firmly and exert light, steady
pressure. Too much pressure at low speed will stall the drill. Too little pressure will keep the bit from
cutting and cause excess friction by sliding over the surface. This can be damaging to both drill and bit.
The variable speed control feature eliminates the need for center punches in hard materials. By using a
slow starting speed, you are able to keep the bit from "wandering”. You can increase the speed as the bit
“bites” into the work.
Summary of Contents for SP-PT237
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