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#67823 07/19/06 10:03 AM
Joined: Jan 2002
Posts: 64
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Rabbit Offline OP
Member
In search of a deep hole saw at least 5". In 4 1/2" diameter. Anybody?

#67824 07/19/06 10:56 AM
Joined: Jul 2004
Posts: 625
S
Member
Dynatech (www.dynatech-diamond.com) has dry-cutting core drills in 4" and 5", and wet-cutting bits in 4-1/2", among other sizes.

(Edited in a vein attempt to get the link to come up as a link [Linked Image] )

[This message has been edited by SolarPowered (edited 07-19-2006).]

#67825 07/19/06 09:16 PM
Joined: Jun 2004
Posts: 92
P
Member
Rabbit,
This depends on the material you need a 4 1/2" diameter hole through.
If wood, then use a regular 4 1/2" bit and drill as deep as possible [about 2"]. Then chisel out the waste. Drill again. Repeat chiseling. If possible access from other side, use a long 1/4" aircraft extension bit to extend your pilot hole all the way through and use the hole saw from the other side. This will create a nice exit hole.
If concrete, layout a 5" circle around your point. Along the circumference, drill a series of 1/4" hole with a SDS rotary hammer about 1/2" apart. Then enlarge these holes to 3/8". Then to 1/2" Eventually the holes will wander into each other. Then attack the remaining webs between them with a chisel point and the rotary hammer -- such as the Bosch Bulldog -- set in "hammer only" position.
If steel: What? 5" of solid steel. Did a structural engineer OK this? Perhaps a plasma cutter or a big blue wrench. Consuly Hougens for a rotary broach. Maybe a trepan.
~Peter

#67826 07/20/06 12:25 AM
Joined: May 2003
Posts: 2,876
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e57 Offline
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If steel, a cutting stick on an arc welder....

Wood, a sharp self-feed bit (Up to 4-5/8")
[Linked Image from coastaltool.com]

Concrete, call someone who does core-sawing, and add them to your bid +>20% mark-up. [Linked Image] Cheaper for single holes this way, but not if you nedd 100...


Mark Heller
"Well - I oughta....." -Jackie Gleason
#67827 07/20/06 11:49 AM
Joined: Jan 2002
Posts: 64
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Rabbit Offline OP
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It is a piece of steel channel under a rooftop unit. Rubber roof, so burning is out. I'm not sure of all the details as it is another PM's project. I told him if it existed the ECN guys would know. Will probably wind up making one. Thanks for all the help!

#67828 07/29/06 08:28 PM
Joined: Feb 2006
Posts: 138
P
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A sawzall and a couple of long blades. Not pretty but functional.

#67829 07/30/06 02:27 PM
Joined: May 2003
Posts: 1,158
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How about an arbor extension http://www.coastaltool.com/cgi-bin/...t+hspl7478ff6f136f+1154381098#extensions

[This message has been edited by dougwells (edited 07-30-2006).]

#67830 07/30/06 07:48 PM
Joined: Jul 2002
Posts: 8,443
Likes: 3
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I've always used the arbor extensions that Doug linked to, for anything deeper than a standard holesaw.
Makes life a lot easier. [Linked Image]


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