D300XT
D300XT Operator’s Manual
17
3.7. Drilling
Use the gear switch to set the gear based on the table that follows.
Tool
Hole diameter
Rotational speed*
[rpm]
[mm]
[in]
HSS annular cutter
12–30
0.47–1.18
290–450 (gear II
)
31–65
1.22–2.56
120–190
(gear I)
TCT annular cutter
12–34
0.47–1.34
290–450
(gear II)
35–70
1.38–2.76
120–190
(gear I)
Twist drill bit
<15
<0.59
290–450
(gear II)
15–25
0.59–0.98
120–190
(gear I)
* For a sharp tool and mild steel with a
strength
R
m
< 500 N/mm
2
(70,000
psi), such as St0 (S185), St3S
(S235JR), or St4W (S275JO)
.
Steel with a strength
R
m
≥
500 N/mm
2
(70,000 psi), such as St5 (E295), 18G2A
(S355N), or 45 (C45), requires lower speeds. If the speed is too high or too low for
the workpiece strength and the type/diameter of the tool, the tool will wear faster or
be unable to drill the hole.
Press
to start the motor. Rotate the handles to the left to put the tool into the
workpiece. Use the speed knob to set a speed sufficient for the actual process condi-
tions. Set the speed knob near the maximum.
When the annular cutter goes through the workpiece, the slug core is
pushed out with a large force.
When you use an annular cutter, drill only through holes. For incomplete through
holes do not use the pilot pin.
Keep the machine in the same position until the hole is made.
Incomplete through holes
Complete through holes
