garigue wrote:

"Dom" wrote in message
...

I'm making some canisters that have a glass piece in them. It is a
tube 200mm in dia, 5mm thick, and 350mm long. The tolerances on the
tube are quite wide, it can be up to 1mm out of round, although the
wall thickness is probably within 0.2mm.

I have a custom made toolpost grinder for parting them off in the
lathe which after some trial and error seems to work well, and I now
have a good process. I can part one off in about 7 minutes.
Currently I'm using a linisher to take off the sharp edge, and prevent
the glass from chipping, however this gives a poor finish, and will
sometimes chip the edge. Deburring in the lathe will not work,
because the piece is out of round.

Any suggestions on a better way to debur the edges? I'm only trying
to achieve a 0.5mm chamfer.

Cheers, Dom.

Oh, I'm need to debur the inside and outside edges.


Fire polishing ???? I did some old bottles years ago with an old
phonograph turntable and a torch ..

Take care ...Tom in Belle Vernon PA



Archived from an old post:

1. I set up my workmate with the jaws open to
about the radius of the jar I
wanted to cut. 2. Laid the jar in the jaws so
that it could rotate. 3. Set up a
tungsten tipped tile cutter to the centre of the
jar and C-clamp in place so that
the cutter is pressing on the jar.

4. End stop the jar using a clamp and a block of
wood. 5. Score the jar by
rotating it by hand against the cutter. 6.
Turning the jar slowly in the lathe I
gradually applied heat from a small hobby gas
torch to the score line increasing
the heat slowly until ping! the end fell off. 7.
Then I dressed off the end with
wet and dry.

Good luck,

Grant Erwin

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