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View Full Version : Ball-end cutter able to undercut



chris_booth
02-07-2009, 11:58 AM
I'm having no luck finding a ball-end cut with a shank narrower than the ball-end and which can cut over 180 degrees.

They're sometimes used in making games boards for games that use marbles - such es e.g. chinese checkers - because thanks to the undercut you can machine a channel that the balls can't fall out of. See the attached image of a chinese checkers board. It might not be obvious, but the balls are stored in the channels and they can only be put back in or come out of the channel at one end.


4779

Anyone know where an appropriate cutter for making this type of channel can be bought?

ron_moorehead
02-07-2009, 12:08 PM
Rockler has one.

http://www.rockler.com/product.cfm?page=5913

chris_booth
02-07-2009, 12:52 PM
Thanks for that Ron...that's exactly the bit I'm after.

srwtlc
02-07-2009, 08:17 PM
Here's some more...

http://eagleamerica.com/search.asp?ss=ball&x=10&y=7&bhcd2=1234051742

And a train track one that may work...

http://eagleamerica.com/train-track-bits/p/139-1775/