Wrong Planchet Strikes

A wrong planchet strike occurs when a planchet designed for a different purpose, or has a different metallic content,
is fed into a coining
press set up to strike coins from planchets of a specific nature.

How do they occur?

         To help understand how this type of error may accidentally occur, a little "inside information" is useful. The following excerpt is from page 10 under "Plant and Equipment" in the 1960 Royal Canadian Mint (RCM) report:  

"Nine automatic press feeders were made in the shop during the year and installed on the presses."  

This is the first reference of automatic press feeders made in the annual Mint reports. From page 14 under "Plant and Equipment" in the 1961 RCM report, it is revealed that:  

"Much time and effort has been given to material handling and the principle of automatic feeding has been applied to the marking machines as well as extended to nine coining presses. Bulk handling, storing and weighing of blanks and scissel is gradually being extended, and in the coming year should see considerable progress in this respect."  

Here we see a continuation of progress made with automatic press feeders. Also important to note are the comments referring to bulk handling and storage of blanks. Perhaps the most important fact relating to wrong planchet strikes comes from page 15 under "Plant and Equipment" of the 1962 RCM report:  

"During the year, three twenty ton bins and one sixty ton bin were purchased and installed for bulk storage of blanks. These are being used with a number of one ton aluminum tote boxes and automatic feed hoppers, in an attempt to decrease manual labor."

These tote boxes have pallet like bottoms which enable them to be moved from one step of the minting process to the next, with the use of a fork lift truck. At one end of the box, on the side at the bottom, there is a sliding door. The interior of the box is shaped so that its contents will flow towards the sliding door, producing an effect known as gravity feed.  

Given these facts it is easy to imagine the following situations:  

·       a tote box filled with Ten Cents planchets (for example) is used to strike coins and is emptied, however, one planchet remained. The same box is then filled with One Cent planchets and used to strike coins. This time the Ten Cents planchet, now mix with the One Cent planchets, is fed into the coining press and struck as a One Cent coin.

·            a planchet found on the floor is mistakenly tossed into a tote box or directly into a press feeder, filled with planchets of a different type.

·            an odd planchet remains in the automatic press feeder after the press has been reset to strike a coin requiring a different planchet.

·       it is also possible for planchets to stray in the various steps of production. For example, an odd planchet left in an annealing furnace, or in one of the large drums used to clean planchets.  

These strange coins are subject to the same rigorous screening as Clips, Off centre’s and other Mint Errors, But, coins struck on Wrong Planchets with specifications similar to the proper planchets tend to get by easier and are unintentionally released into general circulation.

 Known types can be group as:  

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Changes last made on: 03/14/10

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