7 
to safety rules for the subject product. MISUSE or 
failure to follow the safety rules stated in this 
instruction manual may cause serious personal 
injury. 
 
FUNCTIONAL DESCRIPTION 
 
CAUTION: 
• Always be sure that the tool is switched off and 
unplugged before adjusting or checking function on 
the tool. 
 
Adjusting the depth of cut 
Fig.1 
Place the tool on a flat surface. Loosen the lock knob 
and lower the tool body until the bit just touches the flat 
surface. Tighten the lock knob to lock the tool body. 
Turn the stopper pole setting nut counterclockwise. 
Lower the stopper pole until it makes contact with the 
adjusting bolt. Align the depth pointer with the "0" 
graduation. The depth of cut is indicated on the scale by 
the depth pointer. 
While pressing the fast-feed button, raise the stopper 
pole until the desired depth of cut is obtained. Minute 
depth adjustments can be obtained by turning the 
adjusting knob (1 mm per turn). 
By turning the stopper pole setting nut clockwise, you 
can fasten the stopper pole firmly. 
Now, your predetermined depth of cut can be obtained 
by loosening the lock knob and then lowering the tool 
body until the stopper pole makes contact with the 
adjusting hex bolt of the stopper block. 
 
Nylon nut 
Fig.2 
By turning the nylon nut, the upper limit of the tool body 
can be adjusted. When the tip of the bit is retracted more 
than required in relation to the base plate surface, turn 
the nylon nut to lower the upper limit. 
 
CAUTION: 
• Since excessive cutting may cause overload of the 
motor or difficulty in controlling the tool, the depth 
of cut should not be more than 15 mm at a pass 
when cutting grooves with an 8 mm diameter bit. 
• When cutting grooves with a 20 mm diameter bit, 
the depth of cut should not be more than 5 mm at a 
pass. 
• For extra-deep grooving operations, make two or 
three passes with progressively deeper bit 
settings. 
• Do not lower the nylon nut too low, or the bit will 
protrude dangerously. 
 
Stopper block 
Fig.3 
The stopper block has three adjusting hex bolts which 
raise or lower 0.8 mm per turn. You can easily obtain 
three different depths of cut using these adjusting hex 
bolts without readjusting the stopper pole. 
Adjust the lowest hex bolt to obtain the deepest depth of 
cut, following the method of "Adjusting depth of cut". 
Adjust the two remaining hex bolts to obtain shallower 
depths of cut. The differences in height of these hex 
bolts are equal to the differences in depths of cut. 
To adjust the hex bolts, first loosen the hex nuts on the 
hex bolts with the wrench and then turn the hex bolts. 
After obtaining the desired position, tighten the hex nuts 
while holding the hex bolts in that desired position. The 
stopper block is also convenient for making three passes 
with progressively deeper bit settings when cutting deep 
grooves. 
 
Switch action 
Fig.4 
CAUTION: 
• Before plugging in the tool, always check to see 
that the switch trigger actuates properly and 
returns to the "OFF" position when released. 
• Make sure that the shaft lock is released before the 
switch is turned on. 
To start the tool, depress the lock button and pull the 
switch trigger. Release the switch trigger to stop. 
For continuous operation, pull the switch trigger and 
then depress the lock button further. To stop the tool, pull 
the switch trigger so that the lock button returns 
automatically. Then release the switch trigger. 
After releasing the switch trigger, the lock-off function 
works to prevent the switch trigger from being pulled. 
 
Speed adjusting dial 
For RP1110C 
Fig.5 
The tool speed can be changed by turning the speed 
adjusting dial to a given number setting from 1 to 5. 
Higher speed is obtained when the dial is turned in the 
direction of number 5. And lower speed is obtained when 
it is turned in the direction of number 1. 
This allows the ideal speed to be selected for optimum 
material processing, i.e. the speed can be correctly 
adjusted to suit the material and bit diameter. 
Refer to the table for the relationship between the 
number settings on the dial and the approximate tool 
speed. 
Number min
-1
1 8,000
2 12,000
3 16,000
4 20,000
5 24,000
 
006451 
 
CAUTION: 
• The speed adjusting dial can be turned only as far 
as 5 and back to 1. Do not force it past 5 or 1, or 
the speed adjusting function may no longer work.