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true radius dies
what is a true radius die and what are the advantages?
what are the advantages of dies that are not true radius dies? are there true radius dies for the pullmax? how about the english wheel? plannishing hammer?
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Shane Kelly |
#2
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On ewheels, traditionalists seem to prefer TR anvils. Contact flat anvils are more of an American thing and, imo, are more forgiving and easier to learn and use than TR because the overlapping of tracks is much easier. Sometimes TR anvils actually have developed flats due to use against hardened uppers over the years. Due to the smaller contact area, TR anvils are usually more aggressive and move metal a bit faster at the expense of leaving more tracks in the panel. Of the 400+ ewheels we've sold I recall only ONE where the customer wanted to provide their own TR anvils. I'm sure there are folks who have both. Some folks will only use one or the other. I prefer contact flats but can use TR if I have to. Others are just the opposite. It's kind of what you get used to. I'll let others talk about Phammers and dies for recip machines.
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Kerry Pinkerton |
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Thanks for the explanation...
I am making my own dies for plannishing and for my pullmmax, so I am trying to learn as much about dies and their differences as I can.
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Shane Kelly |
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Shane, true radius dies which are just a constant radius are very hard to use to make a smooth panel with correct flow (they are just too aggressive) so that’s the reason for flat areas on the top of dies, which is also known as a hit point. The flat area has a 1/8” or so blend in area (a DA sander with a foam pad works great for this) so there’s no edge to grab the panel and restrict it’s movement thru the dies. The photos below are 5 of my CP planishing hammer dies with the hit points marked with a black Sharpie pen. It’s always a good idea to check your hit points with the blackest drain oil, after a while you will grow to know what the various hit points will do for you. ~ John Buchtenkirch
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John |
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thanks
that explanation was great... I understand now.
Should the dies on a hand held plannisher have flat hit points also? They are set up on a pivot, so would that create any problems?
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Shane Kelly |
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John |
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