CuttingRampingHelical Milling (Blind Hole, Flat Bottom)Helical Milling (Through Hole)
Edge Diameter DCREMaximum Ramping Angle RMPXMinimum Distance LMaximum Hole Diameter DH max.Maximum Pitch P max.Minimum Hole Diameter DH min.Maximum Pitch P max.Minimum Hole Diameter DH min.Maximum Pitch P max.
.0081.13°22.02.963.0912.711.0752.469.060
.0161.13°22.02.947.0902.711.0752.469.060
.0311.13°22.02.915.0882.711.0752.469.060
.0391.13°22.02.900.0872.711.0752.469.060
1500.0471.13°22.02.884.0862.711.0752.469.060
..0631.13°22.02.852.0842.711.0752.469.060
.0791.13°22.02.821.0822.711.0752.469.060
.0941.13°22.02.789.0802.711.0752.469.060
.1181.13°22.02.742.0772.711.0752.469.060
.1261.13°22.02.726.0762.711.0752.469.060
.008.78°31.83.963.0843.711.0733.469.063
.016.78°31.83.947.0833.711.0733.469.063
.031.78°31.83.915.0823.711.0733.469.063
.039.78°31.83.900.0813.711.0733.469.063
.047.78°31.83.884.0813.711.0733.469.063
2.000.063.78°31.83.852.0793.711.0733.469.063
.079.78°31.83.821.0783.711.0733.469.063
.094.78°31.83.789.0773.711.0733.469.063
.118.78°31.83.742.0753.711.0733.469.063
.126.78°31.83.726.0743.711.0733.469.063
.008.59°42.14.963.0804.711.0724.469.064
.016.59°42.14.947.0794.711.0724.469.064
.031.59°42.14.915.0784.711.0724.469.064
.039.59°42.14.900.0784.711.0724.469.064
.047.59°42.14.884.0774.711.0724.469.064
2.500.063.59°42.14.852.0764.711.0724.469.064
.079.59°42.14.821.0754.711.0724.469.064
.094.59°42.14.789.0744.711.0724.469.064
.118.59°42.14.742.0734.711.0724.469.064
.126.59°42.14.726.0724.711.0724.469.064
.008.48°51.75.955.0785.711.0715.469.065
.016.48°51.75.939.0775.711.0715.469.065
.031.48°51.75.907.0775.711.0715.469.065
.039.48°51.75.892.0765.711.0715.469.065
.047.48°51.75.876.0765.711.0715.469.065
3.000.063.48°51.75.844.0755.711.0715.469.065
.079.48°51.75.813.0745.711.0715.469.065
.094.48°51.75.781.0735.711.0715.469.065
.118.48°51.75.734.0725.711.0715.469.065
.126.48°51.75.718.0725.711.0715.469.065

Note 1) When machining a highly ductile work material with the ramping angles in the table above, chips may be elongated.* Shows the distance until a maximum depth of cut of .433” is achieved at the maximum ramping angle L (= .433”/tan α).

For Plunging and Drilling L

See the tables to the right for cutting conditions. Follow the cutting conditions for slot milling regarding feed per tooth and cutting speed.

a Plunging a Drilling

(inch) (inch)

DCae max.DCAZ max.
1.000.2561.000.022
1.125.2601.125.022
1.250.2601.250.022
1.375.2601.375.022
Depth of Cut in the
Radius Direction : ae (inch) 1.500.2641.500.022
2.000.264Diameter of Cutter : DC (inch) 2.000.022
2.500.2642.500.022

Note 1) No step feed necessary. Note 1) Exercise due caution as chips scatter easily. Note 2) Use compressed air to eliminate chips

(or coolant for when machining aluminum alloy). L155