Mill Bit

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how are sharp internal angles milled on a milling machine?

ive heard that it is possible to mill a sharp angle into a piece of metal but am not sure how it is done. as far as i can see it is the same principal as trying to drill a square hole with a milling machine.

the internal angles do not have to be 90 degrees. but any angle that comes to a point, as opposed to ending with a radius the same as the milling bit used.

so how is it done?

Internal acute angles can be milled in a hole with a milling bit that has a special shape like a starburst.
See this : /__ as the profile of the burr edge of the bit. Of course, the hole will be at least the diameter of the whole width of the bit. But the stem of the bit is smaller. That means, the mill bit can be moved in a sidewise distance to increase the diameter at the very bottom of the hole. This can be done on a 5 axis machine with computer control, or on a manual machine with a rotary table holding the work.
A square hole is usually done by finishing the corners of a round or rectangular hole with a plunge bit with a sharp leading edge and two flat faces at 90 degrees. The quill is locked in position and rotated 90 degrees between corner cuts. This hardened bit can work on softer materials with fair results. Or a broaching machine with progressively larger bit surfaces will do that too.

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2 MORSE TAPER 5 8 x 6 DRILL BIT lathe mt mill drilling tool UNION TWIST DRILL
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10Pcs 1 8 Shank 18mm PCB Drill Bit Engraving Cutter Rotary CNC End Mill
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NEW GARR CARBIDE 1 2 END MILL MILLING 4 FLUTE S C MACHINIST CUTTING TOOL BIT
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