Machining a penny
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  1. #1
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    Default Machining Discs

    What is the best equipment ?
    Attached Thumbnails Attached Thumbnails logan-lathe.jpg  
    Last edited by sbogusta; 01-15-2020 at 01:02 PM.

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    For production quantities, I would use a Hardinge second operation lathe (not a chucker). They are very accurate machines that take 5C collets directly in the spindle. They are usually equipped with a lever cross slide and a 6-position manual turret. Look for models DSM59, DV59, ESM59 or TR59. There are usually several on eBay, with varying prices and tooling. Some have sold for well under $1000 with good tooling.

    When I wanted to machine just two pennies to make the wheel rims for a tiny cannon, I used my WW type watch lathe. I held the coins in a wheel chuck and used the slide rest to do the turning. The spokes are made from four 18 size watch center wheels, which each have five spokes. I think the year was 1965.

    Larry

    vanice-cannon.jpg

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    Are you Ted's brother? Email me directly.
    Jim

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    What is wrong with the machine you have?
    If you wanted to pump out 10,000 or a million then, yea but you say a hundred or so.
    You want to buy a new machine or process for a 100 piece run?
    Lets do that math. Base price at auction and scrap metal say 1000, move cost another 2000, wire and spot another 2000.
    So now you have 5 large into 100 pieces if you want to work for free.
    Not sure the magic here.
    Bob

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    Quote Originally Posted by magicmaker View Post
    Are you Ted's brother? Email me directly.
    Jim
    Jim has a great website, worth looking at. I bet he has machined some coins.

    Riser Machinery

    Larry

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    Hundreds of pieces at a time? I would look into a CNC mill and make jigs to hold each sized coin. Those jigs may be as easy as some extra thick jaws for a milling vise and just cutting a coin shaped depression in them.

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    If the Fed discovers what you are doing to large quantities of their product they might get upset.

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    Quote Originally Posted by rons View Post
    If the Fed discovers what you are doing to large quantities of their product they might get upset.
    Really? 100-200 pennies = $1-$2.. LMAO

    I'm sure "the feds" are looking into defacing a couple bucks of government materials hahaha

    edit: my apologies, you are in CA so I guess you might really believe that

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    Quote Originally Posted by EPAIII View Post
    Hundreds of pieces at a time? I would look into a CNC ....
    Kids these days

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    CNC or a manual lathe holding coins would be the challenge. I winder if a small independent 3 jaw might be good with it having jaws with a step shoulder to make face squareness assured. Perhaps just a common 3 jaw with the step jaws.

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    Cool little cannon Larry!

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    +1 on the hardinge machine set up as a turret lathe.

    Hypothetical story: At one time somebody's mom was hospitalized for a long time. The hospital charged $4 per parking event, paid via
    token purchased inside. One might find this to be very expensive, visiting nearly every day for several months. Further a hypothetical
    person with a turret lathe might discover the skills to replicate said brass tokens, identical in every dimension and mass, to the genuine
    article. Except for the embossed lettering of course.

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    Quote Originally Posted by Mike1974 View Post
    Really? 100-200 pennies = $1-$2.. LMAO

    I'm sure "the feds" are looking into defacing a couple bucks of government materials hahaha

    edit: my apologies, you are in CA so I guess you might really believe that
    You believed it and that is enough; hook, line and sinker.

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    Quote Originally Posted by rons View Post
    If the Fed discovers what you are doing to large quantities of their product they might get upset.
    It used to be against the law to deface United States currency, not sure if that is still the case.

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    Quote Originally Posted by jim rozen View Post
    +1 on the hardinge machine set up as a turret lathe.

    Hypothetical story: At one time somebody's mom was hospitalized for a long time. The hospital charged $4 per parking event, paid via
    token purchased inside. One might find this to be very expensive, visiting nearly every day for several months. Further a hypothetical
    person with a turret lathe might discover the skills to replicate said brass tokens, identical in every dimension and mass, to the genuine
    article. Except for the embossed lettering of course.
    The FBI Story:
    A spy code named Whitey was passing a hollowed out quarter or half dollar with microfilm inside. Can see the machine cutting grooves on the inside.
    The fit has to be just right so that the two halves spring apart when dropped on edge in the movie.

    Another propaganda movie to entice kids to join the FBI.

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    Use a Chinese made inexpensive milling machine. They are cheap and can do a lot more than what you want a lathe to do quickly and cheaply machining coins. Use the milling machine to build the fixtures too for even more savings and fun.

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    Quote Originally Posted by Dualkit View Post
    It used to be against the law to deface United States currency, not sure if that is still the case.
    By my understanding making a profit off the venture was a key component.

    Larry making himself a cool mini cannon, using a couple pennies as raw material? No biggie.

    Larry opening up a store selling such mini cannons? That's where we might run into a problem.

    Using modified coins as props in a show? By my sensibilities that's an edge case, but I have nowhere near a comprehensive understanding of the law. In any case, as others have mentioned, the quantities are small on a Federal level so there's likely not going to be any issue.

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    OT:
    Years ago I had vending machines about town. Going to a hotel to service a machine I felt odd as if I was being watched..I asked the manager and he said with those keys in my hand I was being watch by three FBI guys who were on the hunt for a telephone thief who quit the phone company with keeping all the master pay-phone keys..yes robbing phones. I have no idea how many FBI guys were in town at that time...seems they were chasing the thief all about the country..

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    Quote Originally Posted by Dualkit View Post
    It used to be against the law to deface United States currency, not sure if that is still the case.
    Everything is illegal in California, however, nobody really cares if you do it.

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    Quote Originally Posted by rons View Post
    The FBI Story:
    A spy code named Whitey was passing a hollowed out quarter or half dollar with microfilm inside. Can see the machine cutting grooves on the inside.
    The fit has to be just right so that the two halves spring apart when dropped on edge in the movie.
    A True Story :
    Bottlebob had/has ? a web page with a bunch of his little projects on it. One of them is the two-headed quarter.

    Even when flipping a coin bottle always wanted an edge

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