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Video: Milling Inconel 718 Efficiently Without a Heavy Machine

This video of machining Inconel at a fast metal removal rate shows the effect of constant-engagement-angle milling.
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This video demonstrates the metal removal rate in hard metal that is possible with constant-engagement-angle milling, using a tool designed specifically for this style of machining.

The material is Inconel 718. Keeping the engagement angle constant keeps the load on the tool constant—as heard in the steady sound of the cut while the tool is machining. This means the overall cycle is free mill more aggressively.
 
TrueMill CAM software from Surfware provides the steady-load tool paths. The milling tool designed to take advantage of these tool paths comes from Swift-Carb. For more detail about both, see the article under “Editor Picks” at right.
 
Here are the details of this cut:
 
Haas VF-2SS vertical machining center
Swift-Carb Ramp Mill, 0.5 inch diameter, 1 inch flute length
Nikken collet toolholder
0.75 inch depth of cut
130 ipm feed rate
3121 rpm (408.56 sfm)
25.8 degree tool engagement angle
0.0036 inch chip thickness
2.4375 cubic inch per minute metal removal rate

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