In an earlier contribution to this discussion,
N. Thornton wrote:

"Set Square" wrote in message
...
In an earlier thread, I described a device which I had made to
enable a radiator to be drained prior to removal by pumping air in
through the bleed hole - thus pushing the contents up into the F&E
tank (in a vented system only, of course) rather than spilling it
all over the carpet.

Ideally, the bit which screws into the radiator should have a shaped
end - like the original bleed pin - to fit the conical seat in the
housing. In the absence of a model-maker's lathe, I couldn't do
this, but it seals well enough - albeit not perfectly - on the
threads with the use of a bit of PTFE tape. Here it is when fitted
to a radiator. http://www.mills37.plus.com/fitted_to_rad%20.JPG


Nice one. How bout using a drill as the lathe? An angle grinder makes
an effective cutting/grinding tool, conventional tools arent much good
on a holderless drill lathe.

NT

Possibly. I did rotate the 2BA bolt in a drill chuck, and tried to file a
conical shape on the end - but it wasn't very successful. If you look at the
picture of the original bleed pin, it has quite a complex profile as it
approaches the sharp end - I don't how accurately this would need to be
replicated for it to seal on the conical seat. For example, if the hole in
the rad reduces in diameter near the conical seat, my 2BA thingy wouldn't
actually reach the seat unless that did the same. So I settled for sealing
on the threads instead.
--
Cheers,
Set Square
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