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zsmith3rd(at)earthlink.ne
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 Posted: Tue Jul 25, 2006 12:43 pm Post subject: Big Holes (1.125") |
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You may not want to spring for the price of one but Greenlee makes punches, one of which makes an inch and an eighth round hole.
These are called "knockout" punches; come in "diameter" sizes, and "conduit" sizes.
Most two-way radio service/installation shops have an extensive assortment.
The size you seek is exactly what was used in the old days on "low band whips" to punch the large hole for base insulator mounting. A local facility may be inclined to let you use theirs.
Use your caliper to check size.....the "conduit" series makes holes considerably larger than the trade-size conduit marked on the punch, whereas those marked as "xx diam." will punch that size hole.
do not archive
Regards,
Zed/701/R912/90+%
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RWILBERS(at)tampabay.rr.c
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| Posted: Wed Jul 26, 2006 9:45 am Post subject: Big Holes (1.125") |
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Starret Company makes a great hole saw that uses pilot drills as the center
mandrel, and the hole saws are interchangeable for particular sizes. They
are made specifically for thin material and have the teeth set to saw a
perfect hole. Make a small guide hole and the pilot drill will pick it up
and drill a smooth, concentric and accurate hole. I used these on all my
panel holes and they are not that expensive.
They are available from MIS and maybe McMaster Carr.
Incidentally, I flew a J-3 Cub on floats the other day and I wish I had a
701 on floats. What a HOOT doing splash and go's!
Dick in Florida 601HDS STRATUS
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