I got a set of countersink bits that I'd never seen before. They have
a hole drilled diagonally. They have no drill bit they're just for
a countersink. They make a clean hole. I'd always just winged it
with a drill bit but that doesn't produce the best result. Even
if you put a collar on the bit to limit depth.
Have you been using this style of countersink? How hae they
I use these all the time for countersinking.
I use to use the "standard" toothed tools and they work well _except_
for the chatter which produces a rough hole in hard/grainy woods. You
can reduce the chatter to insignificance with careful choice of feed
rates, but it takes practice.
I have the Lee Valley countersinks and they cut just as fast as the
toothed version but with virtually no need to fuss around trying to get
a clean taper.
Nothing against the toothed countersink bits, they still get the nod
when cutting metal and other materials with uniform properties, but this
is one case where I believe in 'the right tool for the job'.
I have a few of those I bought at Horrible Fright that I use for de-burring
pin and screw holes in aluminum molds. They seem to work pretty good so far
for that. I have used them in wood, but not much. They are cheap enough
even if they don't last I can always buy more. They seem to chatter a lot
less in aluminum than other tools I have used for the job.
Hey, they still have them. Woo! Hoo! They have lost so much of their
product line in the last few years I always have to check.
Are you building a boat? That seems to be the place where
long holes are often needed. As far as I know, boatbuilders
usually use a ship auger bit, usually in a brace rather than
a power drill. But those bits tend to cut oversize, so they
may not fit the "accurate" part of your requirement.
Augers can wander like crazy even in a brace.
there's a guy that uses a metal lathe to bore holes in wood to
get clean, accurate holes.
clearing the swath is critical to prevent heat and burn
I saw a machine on craigslist but never got a reply. 99% of posts
on craigslist don't reply
I will probably buy a FAMAG bit although I found a japanese bit
that looks like an auger but is advertised to meet my needs too
Yeah, boatbuilders tend to do a lot of praying while they're
drilling long holes. Fortunately, in boats the hole is almost
always open at both ends, so you can drill halfway from both
sides, which cuts down the error.
Deep drilling is always tough. Still a self feeding bit like a ship auger
is probably as good a bet as anything. The key is in keeping the drive
square, and feeding the drive at the rate the bit self feeds. For smaller
holes its harder because the bit flexes more.
I have a nice long brace and bit extension. I want to say it is 30" or
Dad bought it in the early 50's - Stanley naturally - so he could put
holes through the big timbers used in our large Victorian house we had.
I have bits that fit it - and several braces. We both used them before
spade bits came out and continue to even afterwards on most things.
I have been using the single point countersinks for over 20 years.
They outlast and outperform the other type. The countersinks are smooth
and chatter free, especially in aluminum and plastics.
But once I found this type, I seldom use anything else. Any project
that requires multiple countersunk flat head fasteners make these a must
have. All the countersinks are exactly the identical/correct depth
without thinking or guessing.
(Amazon.com product link shortened)
On 1/21/2015 3:22 PM, Electric Comet wrote:
The ones I got also are a fixed depth by design. No need for the
foot piece in that set you mention.
They are cheaper and it turns out I got 6 sizes as the smallest in the set
has a different size on each end. So 5 bits but 6 sizes.
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