On Fri, 12 Mar 2010 01:43:17 -0500, "J. Clarke"
wrote:

On 3/12/2010 1:08 AM, LDosser wrote:
wrote in message
...
On Thu, 11 Mar 2010 22:46:55 -0500, wrote:

I've got myself into a situation -
I need to drill through 6 2X8 joists which are accessible only from
the one side. They are spaced 2 feet on centers. (need to pull cable
across to the center of the floor). The joists are sitting directly on
concrete, and the decking is 1 1/2" (you read that right) plywood.

What is the lowest power-requiring type of drill to use/ since it
needs to be run on a 12 foot long extension-----.
I tried a speed-bore type spade bit, but it has a bad habit of
"catching" just as it breaks through - putting a severe strain on the
connection between the bit and the extension.

Would a forstner type work better? Or an auger?

Still looking for a viable bit extender setup as well - thinking I
might need to go to 1/2" steel waterpipe with a 7/16 or 1/2" hex shaft
welded into the one end for the chuck to grab. In 3 or 4 foot length
with couplers it should be handleable?

Forgot - the hole needs to be 1 1/2 inch diameter


Hole saw and angle drill. One joist at a time.

If I understand correctly what he wrote, he doesn't have any access--he
has to drill the first joist and then drill the second one through the
hole in the first, and so on. The difficulty seems to be the 12 feet of
extension--not extension _cord_ but bit extension.


Give the man a medal - HE can read!!!!!