Custom Drill Bit?

[deanler]

Im in need of a custom counterbore/drill and was wondering if anyone on here could lend some insite. I basically need a 13/64 drill that steps up to a 17/32's so I can drill the counterbore all in one shot and save some time.

I know they sell "drill rod" but its just sold round.. Is it possible to buy rod that has the flutes twisted into it already that I can machine to what I want and harden it? It's only being used in aluminum. Other then having someone make me one which I'm assuming won't be cheap, what are my options?

Thanks

[jalessi]

http://www.wolftooltech.com/carbide_drills_special.php

[deanler]

http://www.wolftooltech.com/carbide_drills_special.php

Thats probly a little more then im looking to spend I'll probably just keep hand bombing them for now

[handlewanker]

You could make a flat drill from solid HSS round tool bits, grinding the flat part to form a flat drill with the step in, then if'n you have access to a cutter grinder, grind the flats to the diams of the two steps you need.

Alternatively, just take a couple of regular 17/32" drills to someone who does cutter grinding and get them to grind down the end to 13/64" diam for the length you need to do the drilling op.

You may save time drilling in one op, but you do need the volume to justify the expense of a composite tool....they're also very expensive to resharpen.

It's probably simpler to have two drilling machines side by side and mount the part to be drilled in a jig if required and drill it in two ops using regular off the shelf tooling.
Ian.