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I made one similar to Jim’s. They’re great. Turns a nice small ball ( like a marble) or large ( like a doorknob). Not hard.
Problem with most designs is you have to keep away from the chuck a fair bit
Thats why I like the Witte RKD1 design
witte RKD1 - Google Search
Peter,
I followed your link and made my own search. This is a mechanism I never saw before. My guess is that the crank drives a worm and that drives the rotation of the cutting tool, but it is not clear to me exactly what part is actually rotating. It can't be the base with the two semicircle shapes, or is it?
If you would be so kind as to describe how it works , I would really appreciate it. If you have one and could take a sequence of pictures of it in action, it would be great. It doesn't need to cut anything, just seeing the movement is enough.
By the way, for everyone, if you want to see examples of even more elaborate ball cutters, search for the Hardinge one or the one by Monarch!
Thanks,
Jacques
The mecanisme is 2 gears behind eachother with a idler gear in between Then a connection rod A bit like on a locomotief On the connection rod the cutting tool is mounted The radius is set by moving the connectionrod to or from the centre of the 2 gears One gear is actuated with a worm wormwheel The other gears follow as they are in mesh With a round insert you can cut a radius till the ball is cut off 300 dgr or more
Peter
Thanks Peter, this is helpful. This seems to be a unique method of generating a circle, at least for the purpose of turning balls on a lathe.
If I understand correctly, the effective pivot point of the circle movement of the tool is not actually over the tool, it is to the left of the tool entirely. Is that correct?
To generate a ball, the cutting tool has to pivot over a point that is directly under the center of the ball being cut. It seems that this attachment accomplishes that with no part of it ever being directly under the center of the ball.
I would really like to see one of those in action!
Thanks again.
Jacques
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