Hi,
Does anyone have any tips about deburring holes, especially the back end, of thin material. I tried using a countersink bit (they work great for the entrance end) but sometimes it just flattens the little spikes of metal that stick up instead of cutting them. Right now I'm just using a larger drill bit and twisting them off by hand. But this doesn't really produce a smooth counter-sink,
The material I'm working with is 1/16" THK AL Angle.
Thank you