Fellow Shadow Watchers,
Some years ago I distributed
a series of pictures of a process I had developed for holding brass
plate against the jaw faces of a three-jaw chuck in the lathe to turn
rough-sawn circles into perfect discs. This involved double-sided
adhesive tape on the faces of the jaws which were opened to a radius
slightly smaller than the finished disc. This worked very well but cuts
had to be light or the disc would come unstuck followed by messy
cleaning up before re-sticking in place.
While recently making fifteen brass discs for the plates and base
assemblies of five universal equatorial dials for my grandchildren (my
dialling retirement gift to them) I encountered problems when using a
profile cutter to form an ornamental Louise XV moulding on the six base
edges. Even light cuts on a broad face caused heat to build up and this
softened the adhesive grip of the industrial Tesa tape I've used for
years for this process. Long pauses to let the workpiece cool held
things up.
While pondering a solution my eyes fell on a roll of material that has
been lying around the workshop waiting for me to line out my tool
cabinet drawers.
'Premium Grip Liner' made by 'Duck' is a soft, perforated plastic
matting which 'grabs' the drawer contents and stops them moving around.
Mmmh! Would it work?
A disc was cut and inserted between a 9mm thick brass disc and the
cleaned chuck jaw faces.
Then some experimental very light cuts....then heavier ones....then the
profile cutter (in stages to reduce active area of cut).
It WORKS! No slippage and no messy adhesive to remove. The same piece
of matting can be used many times.
I hope the description of the process will be sufficient but JPEGS of
the Duck material packaging and the first successful cut on application.
Tony Moss
P.S. I have no connection with the makers or sellers of this product.
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