In situ is so complex - and in this case it might be best to
just say while it is mounted on top of the boiler or in a water deep
basement or in the .....

For the case naturally - you could use trammel points or a Plasma / gas torch
circle cutter but put a carbide scribe and cut a hole like glass but all the
way through.

I surmise you have a boiler with a cover that has an 8" hole and you want to
put on a 9" header pipe or some such.

Otherwise it would be easy for most sheet metal shops in town.

Martin

Martin Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
NRA LOH & Endowment Member
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member


Peter Jason wrote:
Need a 9" dia hole in a 20# sheet metal
surround of a boiler.

The hole must be neat and cut in situ.

Is there a gadget constructed like a compass
that when rotated often enough will cut such
a hole?

Rather like the typical rotating glass cutter
used for cutting large holes in plate glass.

Please help, Frank



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