Thanks. I can do that but the 3.5 inch hole cutters I can find only go a
couple of inches deep. Maybe a reciprocating saw will do the job once I
have made a hole big enough to accept the blade. I'm going to try this when
the rain stops. Alan C

"Lawrence" wrote in message
oups.com...
On Apr 3, 10:27 am, "AlanC37" wrote:
I need to make a 3.5 inch diameter hole through a log wall for cables
and
pipes for a big split type of heat pump. The total length, including
plaster and siding, will be about 15 inches and the logs are about 12
inches
thick. I have, so far, been unable to find a long enough drill at 3.5
inch
diameter so am considering drilling a number of small holes (3/8 inch)
and
chiselling out the remains of the log. Might be a bit tough for an old
guy
so I am hoping someone could advise me of a better way. I'm sure big
holes
in logs often need to be drilled but don't know how. Any advice will be
gratefully received. Thanks, Alan C37

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Have you considered drilling from each side toward the center? It is
better to drill a through hole, no doubt but I'm sure you can also
measure as accurately as you can from each side and use a square
against the building to guide your bit. After you put the pipe
through you will probably use some type of caulk or foam anyway.




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