When cutting for
copper foil projects it is important to leave a small gap between the
pieces. This is both to allow for the thickness of the foil and for
the solder to form a bridge to the other side of the panel.
I prepare the
space in the cutting process by scoring at the edge of the pencil thin cartoon
line. This leaves the thickness of the line between the pieces. I do
not use pattern pieces unless I am using very dense opalescent glass.
When I do use pattern pieces I cut them out with a scalpel knife so
there is no space between the pattern pieces. I then draw around the
pattern pieces and cut to the inside edge of the drawn lines. This
also gives a margin for the foil.
Fitting the
pieces is still required though. Some people foil one piece and then
fit the next to it before foiling it. This is probably the most
accurate way of getting a close fit. However, I save up my cut
pieces which I have fitted to the cartoon and foil them while
watching TV. My cutting and fitting is normally accurate enough that
I do not have to take the foil off pieces, grind and re-foil.
While doing this
fitting you need to be aware that an additional small gap between
pieces is required to allow the solder to join both the front and
back of the panel. This forms an “I” beam for strength. The
adhesive of the foil is not enough to make a lasting and strong
panel. The solder joining the two sides will give the panel the
strength to last for a long time.
So the small gaps I have due to inaccurate cutting and grinding will be acceptable. My pieces do not fit perfectly together like a tight puzzle. Is that ok?
ReplyDeleteYes, small gaps are certainly acceptable and even desirable. However large gaps that are unintentional are not so good. They will require fillers (foil halved lengthways and stuffed in the gaps or lead came trimmed to fit) to act as carriers for the solder. They of course, will leave a large or wide area of solder. Only you can tell whether to re-cut before soldering.
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