The newer bit has 3 times the number of twists which will remove chips faster. Faster chip removal = cooler running bit.
The newer bit has 3 times the number of twists which will remove chips faster. Faster chip removal = cooler running bit.
And of course, thanks to Mr bitman, aka Lawrence, we all have quite of few of the old style bits.
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More cutting edge and faster transport of chips up is good, but I would worry that the new bit may tend to screw itself into the wood more. More stress on the z drive. More of those plunge stalls. (It may really be dangerous on cast acrylic.) I hope someone will do some comparison testing.
I don't believe I would use this bit on acrylic with the Carvewright. The tightness of the twist would lead to clogging and then melting of the acrylic. This would be best for hard or fine grained woods. As with all things CNC you have to balance it out, materal + feed rate + chip removal.
Just guesing from the photo but it looks like the old one makes approx. 1 revolution around the bit over it's length. The new one looks about 1.5. Maybe like the difference between a 40 and 60 tooth blade. It should cut a little smoother but maybe a little slower.