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Mark Phillips in TN
Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN
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 Posted: Wed Jan 18, 2006 9:10 am Post subject: Deburring drill holes - WAS lightening holes. |
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In a message dated 1/18/06 9:25:57 AM Central Standard Time,
PFolbrecht(at)starkinvestments.com writes:
| Quote: | Thanks, but I meant drill holes, not lightening holes. Those are easy
enough to do.
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Allrighty, then- best thing I've found is a 3-flute countersink about 1/2"
diameter with a 1/4" shank. Get some stiff 1/4" I.D. rubber hose, cut off about
2", stick the countersink in one end and a 6" long 1/4" wooden dowl in the
other, and whirl away. The dowel makes a nice holder that is easily twirled
between your finger and thumb, and can be removed for those tight spots- leave
the hose on the countersink for some extra torque. Another thing I noticed is
that since the hose is never exactly straight, each cutting edge is at a
slightly different angle, making the hole a little "radiused" instead of just
countersunk. PLUS, it acts as a U-joint if necessary to clear obstructions.
Did umpteengagillion holes this way. Tried cordless drill, then screwdriver-
heavy and not sensitive enough and easy to go too deep. Next tried deburring
tool- too much work...
| Quote: | From The Possumworks in TN
Mark
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From The PossumWorks... |
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bicyclop(at)pacbell.net
Guest
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| Posted: Wed Jan 18, 2006 10:23 am Post subject: Deburring drill holes - WAS lightening holes. |
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Another way is to take a threaded countersink bit and stick a piece of
nylon string through the hole. Burn the end of the string so that it
won't pull out of the hole. Wind the string around the body of the
countersink, hold the threaded end of the bit with a 1/4" or so
combination wrench so it can spin freely and pull the string. You can
put considerable pressure on the bit with a finger over end of the
wrench and it won't take more than a turn or two to remove the burr. I
usually get about three holes before I have to rewind the string. You
can get into very restricted spaces with this technique. If there's more
room behind the hole, you can thread the bit into a "spud" (an extension
meant to be chucked in a drill). It's a little easier to control and you
can use it on the front side of the hole too. Just chuck it in a drill
or cordless screw driver and turn it slowly. Ignore the string while
working from the front. One thing to learn is to not over deburr. It's
easy to make it like a little countersink and that's not what you want.
Sometimes stubborn little boogers can be picked off with a fingernail.
Pax,
Ed Holyoke
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Rick Galati
Joined: 10 Jan 2006
Posts: 91
Location: Lake St. Louis MO.
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| Posted: Wed Jan 18, 2006 10:45 am Post subject: Re: Deburring drill holes - WAS lightening holes. |
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Then again, .....you could simply twirl a common #12 (and larger) drill bit with your fingers and thumb to deburr holes.........that works just fine and the burrs won't know any different. BTW, with a deft touch, that 3 flute countersink is just the ticket for countersinking fiberglass.
Rick Galati RV-6A "Darla"
[/quote]
Allrighty, then- best thing I've found is a 3-flute countersink about 1/2"
diameter with a 1/4" shank. Get some stiff 1/4" I.D. rubber hose, cut off about 2", stick the countersink in one end and a 6" long 1/4" wooden dowl in the other, and whirl away. The dowel makes a nice holder that is easily twirled between your finger and thumb, and can be removed for those tight spots- leave the hose on the countersink for some extra torque. Another thing I noticed is that since the hose is never exactly straight, each cutting edge is at a slightly different angle, making the hole a little "radiused" instead of just countersunk. PLUS, it acts as a U-joint if necessary to clear obstructions. Did umpteengagillion holes this way. Tried cordless drill, then screwdriver- heavy and not sensitive enough and easy to go too deep. Next tried deburring tool- too much work...
| Quote: | From The Possumworks in TN
Mark
|
[/quote]
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