After operation, Cutting speeds – Harbor Freight Tools 38119 User Manual
Page 14
SKU 38119
For technical questions, please call 1-800-444-3353.
Page 14
FOR FLAT WORK, lay the piece on to a wooden base and clamp it down firmly
6.
against the table to prevent it from turning.
FOR SMALL MATERIALS that cannot be clamped to the table, use a drill press
7.
vice. Make sure the vice is clamped or bolted to the table.
WHEN DRILLING COMPLETELY THROUGH WOOD, always position a piece
8.
of scrap wood between the material and the table to prevent splintering on the
underside of the material as the drill breaks through. The scrap piece of wood
must make contact with the left side of the column as shown in
Figure 5. Also, set
the depth of the drill so that the drill will not come in contact with the table - or align
the table so that the hole in its center is in line with the drill bit.
Once the instructions above have been followed, lower the Chuck Guard into place
9.
and switch the machine ON .
note: A switch inside the Pulley Cover will prevent the machine from operating unless
the Pulley Cover is fully closed.
the motor housing may get hot under normal operating conditions.
cutting Speeds
Factors which determine the best speed to use in the drill press operation are:
Type of material to be drilled
a.
Size of hole
b.
Type of drill bit
c.
Quality of the hole/cut desired.
d.
Generally, the SMALLER THE DRILL BIT the GREATER THE OPTIMAL RPM. In soft
material, the speed should be higher than for hard metals. As a guide, the drill speed for
a given drill bit size is listed in the chart below.
SPEED RangE
(RPM)
3100
2340
1720
1100
620
Wood
in
3/8
5/8
7/8
1-1/4
1-5/8
mm
9.5
18
22
31.75
41.4
Zinc Diecast
in
1/4
3/8
1/2
3/4
7/8
mm
6.4
9.5
12.5
19
25.4
Aluminum & Brass
in
7/32
11/32
15/32
11/16
3/4
mm
5.6
8.75
12
17.5
19
Mild Steel & Iron
in
3/32
5/32
1/4
3/8
1/2
mm
2.4
4
6.4
9.5
12.5
aFtER OPERatIOn
Remove debris and drill bits from the machine. Thoroughly clean and dry all
1.
surfaces. Oil machined surfaces lightly.
Child-proof the machine and work area. Use padlocks, master switches and/or
2.
remove starter keys.