Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 624)

Thread Cutting
Chapter 25
25-24
Figure 25.15
Multipass Thread Cutting Infeed Parameters
Finishing
allowance
Finishing
allowance
Finishing
allowance
Finishing
allowance
K
K
K
K
Cutting
tool
Cutting
tool
Cutting
tool
Cutting
tool
P1
Single edge
cutting
P3
Single edge cutting
P4
Double edge
cutting
P2
Double edge
cutting
D
D
D
D
D
D
D
D
D Ö 2
D Ö 4
D Ö 6
D Ц 2Ц2
D Ö 2
D Ö 4
D Ö 3
D( Ц 2+ Ц 4)
2
D( Ц 4+ Ц 6)
2
D ’
D’is the remaining material
to reach K -- finish allowance.
D ’
D’is the remaining material to reach
K -- finish allowance. Note 2 equal
passes are made equal to half D’
Infeed Reference
Point
Infeed Reference
Point
Infeed Reference
Point