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Why doesn't my D bit cut?

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Joules:
I'll second more back relief on the cutter, even to the point of the rest of the half circle and LOTS of cutting fluid/coolant to save the tip of your D cutter.

RotarySMP:
I thought D-bits only cut on the front face not on the side, therefore needing no side clearance. I kind of loath cutting stainless, but it was the right size bit of scrap.

I'll throw it back on the Clarkson, and grind some relief under that side edge.
Mark

Joules:
A quick read shows the D bit is more a finishing tool (reamer in harder materials) and perhaps what you want with the amount of material to remove is a boring tool ?

RotarySMP:
If it fails to work as a D-Bit, it will be easy to regrind this to a lathe bit. I was only opening up the bore hole from 10.2 to 11mm, so not a huge about of metal to be removed.
Mark

PekkaNF:

--- Quote from: RotarySMP on June 15, 2016, 07:10:13 AM ---I thought D-bits only cut on the front face not on the side, therefore needing no side clearance. I kind of loath cutting stainless, but it was the right size bit of scrap.

I'll through it back on the Clarkson, and grind some relief under that side edge.
Mark

--- End quote ---

That is the idea, only on front. No clearance on side, but the cutting "point" should lie exacatly on the middle or just a tad below. Did I said it wrong?

Therefore there is other way of bodging D-bit: The front is cut at the angle and there will be an oblique surface that shaves: There is a point where this slant angle is at 1/2 diameter. I have used it on brass, but never anything stronger.

Pekka

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