I think I’ve figured out I need to slow down plasma cutting speed for smaller holes. Question: what is a good way to correct smaller holes that are tapered? Completely cut out with a annular cutter? Or end mill? I’ve tried drills to clean up before when I’ve run into this, but it’s tough on the bit and not a smooth process. I’m just curious if anyone has figured an easy way to clean up smaller diameter (<0.75 in.) tapered holes that doesn’t quickly dull your tooling.
Most people either use the torch to “center punch” and drill or oversize the holes in the design.
I’ve found that a carbide burr in a die grinder works well to remove the hardened surface and remove the taper. That could get time consuming on larger projects, though.
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David has the best answer. I am only replying to empathize:
I cut some 1/2” holes in 1/2” plate and spent hours trying to get close to the 7/16 hole that I actually required. I forgot to check the box for “feed optimization” in Fusion. Ruined two 1/2” cobalt bits. I did not have any carbide burrs but now I do. I have not needed them yet but hopefully better prepared.
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reducing cut speed on inside holes by 50-60% and cutting in a counterclockwise direction will get you the best results in cutting holes…..
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