Programming Tip #4:

Milling holes and other pocket features.

Helical Milling & Ramping are versatile and productive techniques for milling holes, as well as other non-cylindrical pocket features.

Calculator
System units:

Type a depth of cut (ap) that does not allow the output ramp angle to exceed that for the tool chosen in the chart.

Helical Ramping - from solid material
Hole dia Cutter outer dia Insert geometry Hole diameter range for cutter - Dm Pitch Ramp angle Fixed cutting data Peripheral cutting data Tool center programmed cutting data
Insert radius Wiper length Plunging capability Max Min - Flat bottom Min - through hole Cutting speed Spindle speed No teeth Feed per tooth Feed Tool center diameter Feed Feed per tooth
Dm D3 rε bs b Ø Ø Ø ap α° vc n zn fz vfm Dvf vf fz
mm mm mm mm mm mm mm mm mm deg m/Min rpm no mm mm/Min mm mm/Min mm
 
Hole depth mm
Time Min
Circular/Helical interpolation - pre-drilled hole
Hole diameter (mm) Dc Vc n zn θ hex fz fn Peripheral feed Vfm Angular feed Vf Dvf Tool center feed Vf Tool center feed/tooth fz true ae ap
Start Finish mm m/Min rpm no deg mm mm mm mm/Min deg/Min mm mm/Min mm mm mm
 
Hole depth mm
Time Min