Gallery, Projects and General > How to's

Drilling sheet material

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HENNEGANOL:
When I worked at North Eastern Marine In Wallsend, the Drillers always sharpened their drills like that.  I think they called them butterfly drills.

I have found that the best drills for sheet metal are the tapered step drills, I have drilled both sheet metals and fibreglass with them and they do not break out and grab like standard twist drills as they have straight flutes.

Gerald

John Stevenson:
I know them by wing and spur but it's only a name.

Careful of the cheap woodworking ones, many are just carbon steel as they can get away with that to an extent in wood for home butchers.

A HSS ground up as Rob has shown or a true wing and spur will cut metal with no problem and do just as Rob says.

Another trick with sheet metal is to sandwich it between two sheets of ply then drill.

John S.

Rob.Wilson:
Hi Lads


 John made a good point ,,,,,,, i have had a look around and nearly all the wood working drill bits were carbon steel . The HSS steel ones i found were lots of ££££££ .



Cheers Rob

PTsideshow:
Here is also something that will help, in the drilling of sheet goods. I know the ladies in the jewelry classes loved em. Meant they didn't damage their manicures or cut their pinkies.





Don't know what happened to the text on the photos, basically it is any type of toggle type fixture clamp mounted to some scrap chip board or any thing you have handy.
 :dremel:

Pete.:
Great idea!

I had to open-up some holes in thin sheet metal ( 2.0mm ally base gasket and a viton-coated layered steel head gasket) for my bike project. These gaskets are £50 so I didn't want to make a mess of it, and I also could not have any kind of burr.

After a bit of trial and error I hit upon the idea of using an adjustable reamer to open up the holes. I took the blades out of the reamer and put them in backward, so that they formed a 'tapered' adjustable reamer, then simply put the reamer into my battery drill and used it to open each of the holes from 10mm to 12mm.

Worked great, no snagging, no burrs and a perfectly round hole.

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