Thread: Hubs
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Old 09-11-2016, 11:48 PM
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Steve Lindsay Steve Lindsay is offline
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Location: Kearney, NE
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Default Re: Hubs

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Originally Posted by Steve Lindsay View Post
Kent, Yes, cutting backward is different to say the least! The silver was .108" thick x 1.5" in diameter.
I didn't get any tooling with the press. I have been using die sets and making the tooling. I made the die set/tooling for the AirGraver logo to stamp out the disc and press the image on in the same strike. For the princess di coin just to give it a try I made a temporary enclosure (hole) out of tool steel to hold everything in alignment while in the press. I decided 1.5" is just too large to be trying to press in this 150ton press. I have another die set that I started making the tooling for a 1" diameter coin. Hopefully the press can handle that size better.

Hi Art, That is clever about the wax and etching to help lower the higher spots and in effect making the lower portions less deep. Like you say, it must take a lot of experience to know how deep something can be in still fill. It is a lot of work to engrave or sink the die or hub, only to realized that it won't work.

I have acquired a machine recently that you both may be interested in seeing. It came from a good friend, Bertil Aasland, who passed away a year ago. Bertil got it from his friend Sverre Morken in Norway. He is a banknote/stamp engraver. As I understand the story Sverre Morken worked for the bank of Norway and when he retired the bank offered the machine to him since it was no longer being used. Sverre Morken then gave it to Bertil. When Bertil moved from Norway to the U.S. he brought it with him. He had talked a lot about the machine and I was always planned to go see it at his home. It was terrible news to hear he passed away suddenly from an unknown heart problem. I then purchased the machine from Beril's widow, Bjorgny. Bertil or Sverre evidently never did use it. It was in need of a good cleaning and oiling. I haven't done anything with it so far but take it apart to clean and oil. It is a pantograph that was used to mill the coining dies or hubs. It also has a separate machine for grinding the cutters and has its own microscope to aid in the grinding of the small D cutters. The pantograph can be setup to mill on round dies or hobs too. The name on the machine and manuals is: Maschinenfabrik, Michael Kampf F.G., Bad Homburg V.D.H.

Here are pictures of the machines and also a picture of Bertil and Bjorgny. Bertil was the first engraver that I sent a prototype PalmControl to test. He cut a marvelous practice plate with it as a gift.

Steve






Well it has been nine years since I posted the above. The Michael Kampf pantograph has been in storage, but this weekend I cleaned out the backroom and un-buried it. Got it out and now have room to set it up and see what I can do with it. Tried google searches this evening about it and found more information including a 1966 patent of Michael Kampf's
https://www.google.com/patents/US3233520

https://www.google.com/patents/US3406454
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More links... some more interesting than others

http://www.circuitousroot.com/artifi...ppm/index.html

https://en.wikipedia.org/wiki/Guilloch%C3%A9

http://guilloche.org/

http://www.polytechforum.com/craft-m...chine-380-.htm

http://www.practicalmachinist.com/vb...r-info-218072/

https://www.google.com/patents/US3002281

http://www.circuitousroot.com/artifi...ver/index.html

https://www.flickr.com/photos/parnas...in/photostream

https://groups.google.com/forum/#!to...ng/rMa8i3owck4

http://www.schoolebooklibrary.com/articles/Guilloche

http://www.resale.info/info-off.php?...%20KG%20FK%203

pdf file:
http://filatelie-klim.com/PDF/merkur...0Gilosirky.pdf

http://www.circuitousroot.com/artifi...ton/index.html

http://www.circuitousroot.com/artifi...ver/index.html
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