It wouldn't work on the tower, or certainly would be awkward, but when
cutting large pieces of Cr Mo, why not use a plasma torch? When a torch
of adequate size is used properly, heating is localized and confined to
a shallow depth with much of the heat carried off by the high velocity air.
I have cut painted "barn metal" without scorching the paint. OTOH when
cutting near the limits of the torch (IE: near 3/4" with a torch rated
at a max of 3/4" the heat can spread much like an Oxy Acetylene cutting
torch.) With a steady hand, or fixture, the plasma torch can make a
relatively smooth cut. It heats a small area to a very high temp for a
short time. We used to use a variable speed DC motor to turn pipe of
various sizes for cutting and welding.
73
Roger (K8RI)
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