15th century German Knees
Page 3
Raising
This technique is called raising. It is actually compressing the metal around
a shape that generally makes it thicker. To visualize this one can think
of how aluminium foil would wrinkle if formed over an egg. The wrinkles in
the foil would fold over each other on the sides and be several layers thick.
We don't want wrinkles in the armour so will need to move the metal, patiently
compressing it where it would normally want to wrinkle.
The same analogy can help illustrate the negative aspects of too much dishing.
If one were to try to
stretch aluminium foil over an egg without any wrinkles
it would quickly rip.
Above picture shows a ball stake and a raising hammer. I honestly have no
idea why this type of hammer works for this technique while others don't, but
that's how it is. I can raise slightly with a differently shaped hammer
but it is MUCH harder.
It was awfully hard to hold the armour and hammer correctly while taking the
picture. The trick is to strike the steel just offset of the curve
of the stake. The hammer is striking just forward (closer to the camera)
than the apex of the ball stake. This pushes the metal down. If you
strike the metal directly where it comes in contact with the stake you will
stretch and thin that spot, which defeats the purpose. Striking
too far away form that point, where the knee and stake make contact, deforms the metal too much in
one strike and can cause it to wrinkle eventually. This takes some practice
to get the feel of where the "sweet spot" to strike is.
I start raising circles around the centre and work outward with medium force
hits. I usually stop slightly in from the edge of the piece before doing
another pass. This can take many passes, each one forming the piece a little
more.
Keep making passes in rings out from the middle until it is the desired shape.
If the steel at the apex starts to look porous then you are striking too
far off the contact point and too hard. This is a sign that the metal at
the peak is starting to stretch and become thin.
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Making it prettier
