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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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