Surfacing Bits

Had an interesting revelation tonight about surfacing bits.  While Ivan was visiting, having a look over the Torque Workcentre, the discussion turned to surfacing bits.  I was thinking the 3 interchangeable flute Carbitool bit had its carbide tips misaligned from use or something – they didn’t sit flat on the table.  But when I got out my Granite reference block and placed each of the bits on top, they all had the same issue – the bottom of the teeth were not flush with the table as I expected.

Surfacing Bits

Now for one (particularly with interchangeable tips) to be out I could understand, but not all three, both Carbitool and Whiteside, and particularly the (fixed) 6 flute.  That one if no other should be the perfect form for a surface cutter, so if it has the same angle on the bottom of each tooth, then that is the way it should obviously be.

So then I was left with working out why it is that way, now my belief that the bottoms where flat had been squashed!

What I am thinking now is the tip of each tooth is the part that does the cutting, the rest is actually superfluous and is primarily chip clearing, rather than cutting/flattening.  If the bottoms were flat, then the tips would scrape, rather than cut.

It is surprising how long I’ve had surfacing bits that I have never realised that!

Surfacing Bits

What the?

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