Step drills are good for drilling sheet metal, tubing, etc. where you
need to go through successively larger drill bit sizes to get a hole of
a given size. Basically it saves you from having to change the drill bit
half a dozen times to get one hole drilled. As for wood working, I'm
not sure what you'd use it for.
diameter for the threaded portion of the screw, one for the unthreaded shank,
and one for the head.
Doug Miller (alphageek-at-milmac-dot-com)
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Must be different than the step drills I'm used to. The one's I've used
have steps that are much too shallow (maybe 1/8" - 3/16" per step) to be
of any use for pre-drilling screw holes. I just use a combination drill
bit/countersink for that sort of thing. Anyone have a link to a step
drill specifically for wood screws?
I don't have any step drill bits, but I'd consider a set a nice gift.
These speed up the process of drilling a tap hole, another size for
the screw shank, and a countersink all with a single drilling. For
projects that need lots of screws, all the better.
I have some Unibits, and they are wonderful for drilling holes in sheet
metal. You can incrementally work up to the hole size you want, and they
create a perfectly circular hole -- multi-flute bits create almost an oval
No idea where they would be good for wood.
I always thought of them as gimmicky. Then the one time I halfway had
a use for one I priced it out and found out they're not in the gimmick
aisle. I did a workaround.
The Teutels on American Chopper (Brawl in the Family) use them a lot,
so they must not be as gimmicky as I thought.
Master Woodbutcher and seasoned termite
Shamelessly whoring my website since 1999
If you're tired of twist drills grabbing thin sheet metal bits out of
your hand, then you'll want to use a step drill. Cut nice round holes
through thin metal like a hot skewer going through butter brickle ice cream.
Mmmmm. Butter brickle ice cream.
Mike "Rocket J Squirrel" Elliott
71 Type 2: the Wonderbus
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