Learning clock repair in the mid 1970s, I started by using my instructor's tools. The bushing machine he had was a Swiss made tool with serious (to me) limitations for clock work. It was so light in weight (and with a small base) that you needed two hands to keep it in one place on the bench while using it. It also often was not deep enough to reach to the center of a large clock plate.
I felt there had to be a better way so I came up with this design shown along with the accessories I also made:
In 2012 I cleaned it up considerably to enter it in the Craft Competition of the NAWCC. Below are two photos I used to show design features. The slotted bar that holds the clamps can accurately swivel around the center anvil increasing the tool's versatility. It is shown with a plate from a large hall clock shown next to a regular American 8 Day movement for comparison:
The commercial machine I mentioned did not allow the clamps to swivel or overlap at the center. Here I show how my machine overcomes this shortcoming and is being used to open the hole in a suspension spring. All of the cutters as the one below are ground from HSS drill blanks so they will likely last a few lifetimes:
Finally, the results of the National competition:
All material on these pages is copyrighted by Jim Haubert 2002 - 2018
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Now Located on "The Mother Road", Historic Route 66