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Topic: Making gaff coins and Tooling
Message: Posted by: jack_shields (Jun 1, 2020 12:55PM)
Hello all,

Does anybody know the best way to cut a circular recess into one side of a coin?

Eg 20mm diameter recess into the back of a 10p.

Sort of if you were making a shell to fit a smaller coin on one side but leaving it unchanged and unnoticeable on the other.
Message: Posted by: Bill Hegbli (Jun 6, 2020 02:12PM)
You will most likely have to buy a lathe.

Go here: http://www.jamesriser.com/Magic/JamesRiserMagic.html

Scroll down to the topic, For the Do-It-Yourself Magician. He offers how to make coin gaffs.
Message: Posted by: Stephon Johnson (Jul 6, 2020 02:48PM)
CNC machines are very expensive! You can ask Jake Jr. at Airship Magic to machine something FOR you. I have had them make things for me. Ask for a quote from them to make your gaff.

Thanks
Steph
Message: Posted by: Bill Hegbli (Jul 8, 2020 11:03AM)
You don't need a CNC machine, just a small Lathe, of course you have to go to learn how to set one up.
Message: Posted by: Mad Jake (Nov 15, 2020 11:25PM)
[quote]On Jul 8, 2020, Bill Hegbli wrote:
You don't need a CNC machine, just a small Lathe, of course you have to go to learn how to set one up. [/quote]

Using a CNC vertical mill is a lot quicker than setting up a manual lathe. Total time to do what is being discussed is about 7 minutes. Between
set up and making the cut on a lathe can take a lot longer and will cost more.
Message: Posted by: Mad Jake (Mar 23, 2021 04:29PM)
[quote]On Jul 8, 2020, Bill Hegbli wrote:
You don't need a CNC machine, just a small Lathe, of course you have to go to learn how to set one up. [/quote]

A lathe is a lot more expensive that a small vertical cnc mill. With a cnc you make a simple jig for a 10p coin in minutes.

Using a lathe you will need to make a collet for the coin, which is a lot harder and timely than making a jig.
Message: Posted by: Bill Hegbli (Mar 26, 2021 05:07PM)
Jack_shields, post did not mention anything about if he was going into business.

I had a friend that that wanted to make wood thimbles. He got a small lathe for around a hundred dollars, made some great looking thimbles. The lathe could set on a desk, it was no more then 2 feet long, and 10 inches high.

Some books from the library and he was operating it in a few days.

Jack only wants to make a coin with a recess circle on one side. He could do that with disc of sandpaper, and a few hours time. The coin can be held against a table with a clamp.

By the way Jack, you have to make the recess on the back side of the coin. Otherwise it will do as you mentioned, show through.