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Old 05-18-2015, 08:05 PM
skelly24 skelly24 is offline
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Default 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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Old 05-18-2015, 08:16 PM
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Kerry Pinkerton Kerry Pinkerton is offline
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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?
Shane, any machine that has dies can have true radius tooling or contact flat tooling.

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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Old 05-19-2015, 08:45 PM
skelly24 skelly24 is offline
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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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Old 05-24-2015, 07:41 PM
John Buchtenkirch John Buchtenkirch is offline
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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
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!die.jpg

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Old 06-28-2015, 07:39 AM
skelly24 skelly24 is offline
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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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Old 06-28-2015, 09:53 AM
John Buchtenkirch John Buchtenkirch is offline
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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?
The only time I use true radius dies is when I want to pre stretch an area significantly before performing another operation…… better than 98% of the time they just ARE NOT my go to dies. On any powered hammer (pneumatic or electric powered) they are just too aggressive for most use, other opinions may vary. ~ John Buchtenkirch
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