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Helically Interpolating a Hole at 225 IPM Through a Milled Slot
with Toroid End Mill and RHINO-CARB™ Inserts from Dapra
This video demonstrates Dapra's 1" Toroid End Mill executing the helical interpolation of a 1.75" diameter hole to a depth of 1.25". The material is H13, and the machine tool used is a Fadal 4020 with a 40-taper spindle.
Hole making with helical interpolation provides fast metal removal without significant spindle load or stress on the machine tool. It also allows for hole making to begin on a less than ideal surface, as the video demonstrates. In this case, the top 1/2" of the hole is made through an existing slot, a function not possible with a drill. Additionally, helical interpolation allows many hole sizes to be achieved with one tool, also not possible with a drill.
The parameters for this video are:
Helixing Steel - 225 IPM
1" Toroid End Mill (2 Flute)
1018 Low-carbon Steel
1200 SFM (4600 RPM)
.025" IPT (225 IPM)
.030" Helix
1.75" Hole Diameter
1.25" Total Depth
40 Taper VMC
For more cutting demonstrations, please visit Dapra’s Tool Demo Site (http://www.dapra.com/tech/videos.htm)