The drawing says 125mm radius that's 4.9" or 9.8" dia.
To keep that sort of even curve at a large radius like that (either) the ideal tool would be one of the Aussie Motorcycle fender rollers that were discussed on Metalmeet (MM). That is a lot of material to move, and it will have to be done slowly and evenly. You may need to anneal the copper a couple times, but may luck out with once.
It is possible to do it by hand but it will take patience.
I think you could form a straight channel with a clamp to hold it down and feed it forward over a hammerform with a slightly too small radius and just keep working it down with a slapper.
I'd ask Butch over on MM he has hand planished several large kettles back from the edge of the scrap heap.
Gene Olson
Sculptor
Elk River, MN
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The drawing says 125mm
The drawing says 125mm radius that's 4.9" or 9.8" dia.
To keep that sort of even curve at a large radius like that (either) the ideal tool would be one of the Aussie Motorcycle fender rollers that were discussed on Metalmeet (MM). That is a lot of material to move, and it will have to be done slowly and evenly. You may need to anneal the copper a couple times, but may luck out with once.
It is possible to do it by hand but it will take patience.
I think you could form a straight channel with a clamp to hold it down and feed it forward over a hammerform with a slightly too small radius and just keep working it down with a slapper.
I'd ask Butch over on MM he has hand planished several large kettles back from the edge of the scrap heap.
Gene Olson
Sculptor
Elk River, MN