In article , Jesse L Zufall wrote:

I have a 4x7.7 I-beam I need to drill a series of 1 3/8, 2" and 2 1/2" holes
through the web. What is the most productive means to accomplish this. I
have tried the BLU-MOL hole cutters but the noise is incredible and it is a
slow process. Need to cut the noise and increase the speed. I see where
Travers has circle cutters ..( 57-071-001) was wondering if anyone has ever
tried these and how the hold up.
I do have access to an small lathe and mill and am open to other
alternatives.

Cut the holes with a torch. You *could* use a rotabroach for the smaller
sizes, but unless you've got a real good reason not to, I'd just use the
torch. Those circle cutters can't be used effectively in hand tools.


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Mike Graham | Metalworker, rustic, part-time zealot.
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http://www.metalmangler.com| Caledon, Ontario, Canada