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Restoring a vintage Denver Mint coining press to operational condition
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<p>[QUOTE="Tom Maringer, post: 2706969, member: 7033"]I have eight operational presses on the shop floor right now, from 5 ton to 320 ton capacity. Each has its own specialty usage. I'm not terribly impressed by the Bonny Doon hydraulics. They're really meant for forming not coining... being slow, and 20 tons is barely enough to strike dime size piece in very soft metal. In my experience, making blanks is actually far more time consuming and trickier than striking. So you'll want a light press with a through hole for blanking... something like an Adams 2-A for instance. I would watch eBay, searching on "coining", "fly press", "screw press", "knuckle press". For striking up to quarter size, a screw press in the 40 to 50 ton range would be perfect. The Zeh & Hahnemann #7 is a classic. I've got one, Ron Landis has one, they're very handy. But many companies made them. There are not many dealers of this type of equipment, but <a href="http://goldmachinery.com/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://goldmachinery.com/" rel="nofollow">Gold International Machinery </a>certainly has the best selection, even if their prices are stiff. I've purchased two of my presses from them. Problem is... one press is never enough! There is no one press that will do everything. And there's no place to buy all the die-holders and fixtures you need... so you'll need a decent metal lathe. And before long you'll start looking at rolling mills and plate shears, heat-treating ovens, tumblers, media separators.... the fun never ends![/QUOTE]</p><p><br /></p>
[QUOTE="Tom Maringer, post: 2706969, member: 7033"]I have eight operational presses on the shop floor right now, from 5 ton to 320 ton capacity. Each has its own specialty usage. I'm not terribly impressed by the Bonny Doon hydraulics. They're really meant for forming not coining... being slow, and 20 tons is barely enough to strike dime size piece in very soft metal. In my experience, making blanks is actually far more time consuming and trickier than striking. So you'll want a light press with a through hole for blanking... something like an Adams 2-A for instance. I would watch eBay, searching on "coining", "fly press", "screw press", "knuckle press". For striking up to quarter size, a screw press in the 40 to 50 ton range would be perfect. The Zeh & Hahnemann #7 is a classic. I've got one, Ron Landis has one, they're very handy. But many companies made them. There are not many dealers of this type of equipment, but [URL='http://goldmachinery.com/']Gold International Machinery [/URL]certainly has the best selection, even if their prices are stiff. I've purchased two of my presses from them. Problem is... one press is never enough! There is no one press that will do everything. And there's no place to buy all the die-holders and fixtures you need... so you'll need a decent metal lathe. And before long you'll start looking at rolling mills and plate shears, heat-treating ovens, tumblers, media separators.... the fun never ends![/QUOTE]
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Restoring a vintage Denver Mint coining press to operational condition
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