A year or so ago there seemed to be quite a lot of New Old Stock Bison lathe chucks on UK ebay, so some went very reasonably. A stockist must have gone bump I suppose. I had the chance of a 12" 3-jaw very cheap to fit to my TOS SN40C, so snapped it up. It was listed as plain back, so I'd need a backplate. I never even bothered to open the crate it was in, it's just sat there until I needed it. The standard chuck for the lathe is a 10", but it should handle a 12" without trouble. This weekend I did have a job for the bigger chuck, so decided to bite the bullet & sort out a backplate for it. The lathe has a C1-6 DIN spindle, which is exactly the same as D1-6 Camlock except that it uses 4 threaded studs instead of the 6 Camlock pins. It wasn't going to be a simple job, unless I wanted to spend more than the chuck had cost me on a new backplate. Cut the steel banding off the crate, opened it up and found.....a 12" chuck with integral D1-6 backplate!! All that was needed was to split the chuck, set the backplate on my rotary table & drill and tap two extra stud holes, and then turn up a set of 4 new studs. Hey presto, one 12" chuck with integral C1-6 backplate![]()



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