Franklin Peale Peale designed a new machine to cut planchets, or blanks, from metal strips. This machine remained in use, almost unmodified, until 1902. Another of the steam-powered machines Peale had installed on his return was a milling machine, which was used to "upset" the coin—to form a rim around it. A Contamin portrait lathe was imported from France and installed at the Philadelphia Mint in 1837. Prior to this time, all coin dies for American coins had to be made individually, by hand at Philadelphia. Once the lathe was installed, they could be reproduced mechanically by the pantograph-like device. The first
Metal spinning attached. In CNC applications, carbide or tool steel cut-off tools are used. The mandrel does not incur excessive forces, as found in other metalworking processes, so it can be made from wood, plastic, or ice. For hard materials or high volume use, the mandrel is usually made of metal. Several operations can be performed in one set-up. Work pieces may have re-entrant profiles and the profile in relation to the center line virtually unrestricted. Forming parameters and part geometry can be altered quickly, at less cost than other metal forming techniques. Tooling and production costs are also comparatively low. Spin