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Robinson Hot Air Engine.
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Bluechip:
Nope, no idea, but ...

How does the 1/8" BSP tube rotate to screw into ... well, whatever it screws into ??

Dave BC
Stilldrillin:

--- Quote from: Bluechip on November 05, 2010, 04:56:27 PM ---Nope, no idea, but ...

How does the 1/8" BSP tube rotate to screw into ... well, whatever it screws into ??

Dave BC

--- End quote ---

Dave.
There was a screwdriver slot spanning the outer end of the tube.

Only, the screw plug was jammed in so tight, it broke off!   :loco:

The only way out now, is to drill the whole tube away.......  :bang:

David D
Bluechip:
Maybe that is the problem. I would guess that the screwed end is there to make a fluid-tight joint ??

When you first posted pics. I could not work out why the U-shaped slot was there.

Would not be too difficult to remove the tube on a lathe, strapped to the cross-slide?

Sez he, not having seen it ...  :scratch:

Do you have a drawing of it? Is the tube supposed to be just a tightish fit in that cast rib?

Is it gobbed up with some sealant to stop any fluid going up between the tube and it's hole? ie Can it be driven out? A blast of heat often weakens any sealant.

EDIT

Crap, my brains stopped again .... remembered ..

Is it possible to tap the inside of the stuck tube, and draw it out with a 'studding/ washer/nut/tube' puller

Dave

As 1/8" BSP is .383" nominal, I bet a 3/8" drill will be OK. Maybe the bit of tube wall left would collapse?

Baffled .. again .. just getting over a lousy head cold ...  :(

Dave BC





sbwhart:
Dave

How about putting a screwdriver slot across the bit of tube sticking out, then put a length of bar through the hole that has a cross hole in the end, then slip a bit of silver steel through the cross hole so that it engages with the slot, so it work like a backward, if you see what I mean  :loco:

Hope this helps

Stew
shoey51:
Nice one David pity it wouldn't run for when we were in STLL
cheers Graham
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