On 2008-09-05, Joe AutoDrill wrote:
I've got a customer in Mississauga, Ontario, Canada...

They would like to buy a HSS or coated tool capable of drilling 8mm, 10mm
and 15mm in closely spaced "steps" on the drill.

Hmm ... this sounds like a metric version of a Unibit. I wonder
if they make them in metric steps? There are versions in 1/16" steps,
and other versions with three target dimensions (for conduit fittings,
IIRC), and a bunch of smaller steps joining them.

O.K. Google took me first to:

http://www.mytoolstore.com/klein/59021.html

which has various ones which will combine two of your desired diameters
in one tool, but skip over a third of the diameters.

But perhaps they can make a special?

Here is another maker -- starting at 6mm, hitting 8mm, 10mm, and
again bracketing your desired 15mm with 14mm and 16mm.

http://www.irwin.com/irwin/consumer/jhtml/detail.jhtml?prodId=IrwinProd100145

Perhaps a custom grind to take the 16mm step down to 15mm?

All this depends on whether each diameter has to protrude a
certain distance beyond the next, or whether this is simply for making
three different sizes of holes in sheet metal without a tool change.

Anyone know a good source for such custom tooling? Round shank tooling with
a 0.750" or smaller shank please... If it matters.

Klein seems to hold the trademark name on the Unibit -- and they
make both metric and the original inch sizes, so maybe they can make a
special for not too much extra cost -- depending on whether the depth of
each step needs to be controlled.

Volume is low to medium on this special, simple tool.

Understood.

Good Luck,
DoN.

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