Instruction Manual Section Seven
IV. CLEARANCE ANGLES —CARBIDE REAMERS
RECOMMENDED PRIMARY (RELIEF) & SECONDARY (CLEARANCE) ANCLES:
RECOMMENDED CIRCULAR LAND WIDTHS
V. STANDARD CLEARANCE ANCLE SETTINGS FOR H.S.S. CUTTERS
AND FOR CARBIDE FACE MILLS
*Smaller diameter cutters require larger relief angles.
—107—
Reamer Diameter Relief Angle
Clearance Angle
¼" to ⅜"
⅜" to ⅝"
⅝" to l"
l" to 1½"
Over 1½"
20° to 15°
15° to 10°
10° to 8°
8° to 6°
6°
40° to 30°
30° to 20°
20° to 16°
16° to 12°
12°
.005"~.010"
.010"-.020"
.020" plus
Aluminum bronze
Low lead bronze
Copper
Magnesium
Steel—heat treated
Steel forgings
Bakelite
Hard rubber
Aluminum castings
not heat treated
Free cutting steel
Free cutting brass
Cast iron
Die castings
Bearing bronze
Heat treated aluminum
Babbitt
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