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Old 07-09-2018, 09:10 AM
John Buchtenkirch John Buchtenkirch is offline
MetalShaper of the Month October 2012
 
Join Date: Jul 2009
Location: Glen Cove, Long Island
Posts: 1,675
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Planishing (particularly with a pneumatic hammer) is just blending highs & lows into a smooth panel. Initially there can be a slight amount of shrinking during the smoothing process because you are trapping the highs & lows between the dies but once the panel is smooth enough that both dies have full on contact both sides of the panel you are surely stretching. That’s assuming that you have a planishing hammer that works in pretty much a constant state of panel pinch like a CP hammer & most of the others do, I can’t speculate about home built hammers only because I’m unfamiliar with their operation. A combination of dies with small hit point and using a higher air pressure can do quite a bit of stretching / shaping with a pneumatic hammer……… so that’s what you need to avoid if you’re concerned about stretching the panel you’re working. ~ John Buchtenkirch !!!!!!!!!!CP2.jpg

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