About 30 years ago I worked for a guy who had a set of drills for wood
screws. They drilled the pilot for the threads, the counterbore for the
shank, and the countersink for the head. They were sort of like spade
bits in that they were fashioned from a solid piece of flat stock.
All I've seen lately are the kind with a separate drill bit that slips
into a collar that has the counterbore and countersink cutters, or
sometimes just the countersink.
Anyone know where to get the style I remember from back in the day?
Yeah, my junk drawer :)
Sears used to sell them in the 60s and 70s. They also sold a collar device
for them to adjust depth of countersink. They worked OK for a while - a
short while - but soon dulled. The gizmo to set countersink depth slipped
too. IOW, the new ones are much better.
I've a pretty nicely made set from General but they no longer seem to be
in the product list... :(
First set I found was...
These are not as nice--it appears they're the style made by forming a
flat piece of stock for the shank instead of a shank...
The set I have is product S-10; unfortunately, a search for new old
stock and eBay didn't uncover any either place..
That is "instead of a solid round shank" that the General set had.
The were well enough made that can rehone an edge and they worked quite
satisfactorily for the countersink; agreed one would not want to use
them to drill the pilot hole in very hard wood; they have no chip
ejection mechanism and are not a drill bit (nor intended to be).
I has a set long ago. Think they were Black and Decker.
Didn't work well in hard wood. Tore it up.
I wouldn't call them "spade," just flat with shoulders.
I looked a bit, but can't find them on the net.
There's probably good reason they don't sell them any more.
Twist drill with cutter works better.
Do you still use screws with shanks larger than the threads? I had a set of
those *many* years ago. They're junk compared to today's Snappy
countersinking drill bits.
They're available with either tapered or straight bits.
It's been a long time since I checked, but back in the years when I
was active in boating (building & living aboard) I used to get tapered
bits with adjustable countersinks from our local marine stores. It
might be worthwhile to check some of the online marine supply stores
to see if they're still available, or if you have a large marine store
locally, give them a call to see if they carry them.
As a follow-up to my first reply, a quick check of sources for tapered
drill bits produced the following:
[links to several different sizes and types of tapered bits and sets]
These might have what you're looking for.
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