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Posted by The Daring Dufas on September 26, 2007, 6:23 am
wolftever2003@yahoo.com wrote:
> I'm using a Hilti drill to drill holes into concrete ceilings.
> Drilling overhead with a heavy drill and big bit is making it
> difficult to keep the hole straight. The Hilti is more than up to the
> job ... the problem is when you're applying upward force, the natural
> tendency is to pull the drill toward you or away from you, which makes
> for a slanted or "crooked" hole. Any tips on how to keep the drill
> straight so as to achieve the straightest possible hole?
>
Go to a thrift store and find an old three footed walking
cane. The tripod base would make a very light stable platform
on which to mount your drill guide. A piece of 3/16 aluminum
plate with 2 or 3 steel guide rods for a cobbled together drill
holder mounted to the feet should slide straight. If clearance
around conduit and such would make it a problem for the rubber
footed tripod, simple 3" spikes on the flat plate would suffice
for legs. We had a sheet metal shop here in town who's owner
would give me all sorts of scrap pieces of different metals
from the scrap bin, I really mourned the closing of that shop.
I have a portable drill guide like this one that I use:
http://www.garrettwade.com/jump.jsp?itemType=PRODUCT&itemID=105318
I don't think it would fair well with a hammer drill unless
the chuck was changed out to a hammer drill chuck. It could give
you a good idea on how to build your own heavy duty guide.
TDD
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