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Thread: Cutting a large shaft with a thermal lance - video

  1. #1
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    Altair's Avatar
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    Supporting Member hemmjo's Avatar
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    What is the lance made of?

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    nova_robotics's Tools
    Been there. 12 hours of overtime later it was cut.

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    nova_robotics's Tools
    Quote Originally Posted by hemmjo View Post
    What is the lance made of?
    I think they're just steel tubes. Maybe with some other stuff sprinkled in to make them more burn-y. The steel tube is mostly just a consumable delivery system for oxygen.

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    Supporting Member Frank S's Avatar
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    Quote Originally Posted by nova_robotics View Post
    I think they're just steel tubes. Maybe with some other stuff sprinkled in to make them more burn-y. The steel tube is mostly just a consumable delivery system for oxygen.
    Some are just steel tubes but the ones that burn the hottest have rods or wires inside them of a metal that makes them burn at 10,000
    When I was doing heavy equipment repairs I had a Broco Prime cut torch with collets to clamp 1/4 & 3/8" rods A lot of times I would be called upon to lance the core out of a seized pin ranging form as small as an inch to as large as 10 or 12 inches in diameter I would lance a hole all the way through the length of the pin large enough to hollow out the core then quitch cool it with CO2 or liquid nitrogen a lot of times the pin could be slid out with a gentle push or light tapping with a 20 lb sledge for the largest of them
    I don't know of anything they won't cut through
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    Supporting Member Frank S's Avatar
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    I had even used mine cutting underwater in leu of having to set up my underwater cutting torch which if I was having to cut below 12 to 14 feet I would have to burn hydrogen instead of acetylene plus with the prime cut there was no need to have an air compressor to feed an air bubble while cutting as opposed to a fuel ox underwater torch. To light the rods you could either connect your welding stinger to the lug on the torch and scratch strike the rod against a grounded piece of scrap or you could light them from the flame of a cutting torch or from blowing the oxygen over a burning 2x4 They will stay lit as long as there is some oxygen flow, it takes 35PSI to lance with a 1/4" tube and 50PSI to lance with a 3/8 tube. For underwater cutting maintain 35 to 50 PSI above the pressure of the depth. Cutting underwater with the prime cut is an experience worth experiencing



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