COUNTERSINKS Cabinet 3

1
COUNTERSINKS Cabinet 3
Purpose The countersink is used to mill a hole
for flat head machine screws so they can lie
flush with the finished surface. They are also
used on drilled holes to remove the sharp
edges. Safety The operator should not wear
gloves or jewelry.
Available Sizes Available Sizes Available Sizes
60 82 90
3/4 5/16 5/8
3/8 1
1/2
3/4
1
1.5
2.67

• Instructions
• Select the proper drill for your screw size.
  Drill the hole to the appropriate depth.
  (Figure1)
• Select countersink 1/4 larger than the
  diameter of the screw head.
• If countersink appears to have a jagged edge, or
  does not cut properly, show tool to a mentor.
• Insert countersink in chuck on drill press.
  (Figure 2)
• Set cutting speed to half of drilling speed from
  the Cutting Speed Chart by the office.
• Countersink hole deep enough so that the screw
  head is flush with the surface of the component.
  (Figure 4)

Figure 1 Drilling
Figure 3
Figure 2 Countersinking
Figure 4
Last updated May 30, 2007