http://vimeo.com/64726512
See the section beginning at 3:15.
Best of luck.
Cheers
PeterH in Perth
p.s. Just in case you cannot access the video:
What is shown at 3:15 is a simple method of crimping
which occurs when the fuel vents are created in the top section.
A pocket knife is used to press evenly spaced creases around
the top part of the can along the length of it, much like a stovepipe
joint.
The knife makes a small dent at the shoulder of the can top which
becomes a vent channel. The crimped lower edge of the can top
can now be inserted into the bottom part of the can.
-------------------------------------------------
----- Original Message ----- From: "RH Hutchins"
To:"old >> Unknown"
Cc:
Sent:Tue, 26 Aug 2014 16:03:49 -0500
Subject:[OldTools] Expanding Aluminum
If this is OT, I trust the listmoms to file it in the round file.
I'm trying to make some beer can stoves. I'm making a dozen or so to
give to friends. The design I'm using calls for a top (with a hole in
it to receive fuel) and bottom which sandwich in a baffle made from
the
spout of the bottle-shaped been can. The process means that the
bottom
piece must be stretched ever so slightly to allow it to slip over the
top piece. The instructions I've seen call for all kinds of
techniques
and I've tried most of them with mixed success.
One of the problem is that the aluminum is so thin that it dents very
easily; so great care must be taken to avoid this as it pretty much
ruins the design and the function of the stove.
After cutting out the requisite pieces, I've tried stretching the
bottom
sides with no success. I've placed the bottom on another can and
gently
pressed on with a press but then I can't remove it. I've cut the
other
can away and removed it but the bottom didn't expand enough to
accommodate the top piece.
I hope that this description makes SOME sense.
Can anyone suggest techniques that I might use. I have a number of
old
tools - including my feeble brain that just entered its 73rd year -
that
I might put to use but am at a loss which to try.
Bob Hutchins
Temple, TX, USA
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