Electronics > Mechanical & Automation Engineering

sheet metal drill bits?

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coppercone2:
Does anyone know of a drill bit set meant for drilling sheet metal that has the geometry required to make nice holes? I don't mean a step drill, I mean like a twist drill with special points.

I see some theories about something along the lines of crown point drill bits for drilling sheet metal nicely. I got a set of acrylic drill bits a while back and I am very happy I got that, so I was thinking it might be nice to have for sheet metal.

I.e. something like this
https://qrpbuilder.com/wp-content/uploads/2016/11/sheet-metal-drills-a.pdf

bdunham7:
Black and Decker 'bullet' drill bits are sort of like that.

WattsThat:
Standard bits work fine using this machinists old trick. (start at 5:50 if you just want the method without the drama):

metrologist:
Also maybe you seen the YT vids of the machinists fold a small piece of denim cloth over their hole and drill through that. The swarf get wrapped up with the cloth and bit which prevents it from grabbing and tearing through. I haven't tried it.

coppercone2:
I was hoping there was a drill bit solution, those cloths look great but I find myself dealing with sheet metal enough that I don't think I would mind buying a specialized drill set, if it exists. That might be useful if you need a non standard hole and like letter drills on a sheet metal. For number drills I don't know, they seem too small for a cloth.

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