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jrmason
08-13-2003, 03:50 PM
I just purchased a divider for my mill at a swap meet..It has a cushman 3-jaw chuck and the lower half was Allison 1264 base. It's division are 3/4 of inch.Each time you relice the chuck. There are holes around the base. My question is can the division's be changed?? Or am I stuck with 3/4"..Anyone who knows how to work this thing pleeese help. thanks john

Evan
08-13-2003, 04:33 PM
I will assume it has 24 holes. This allows direct indexing of 2, 3, 4, 6, 8, 12 and 24 divisions. A full discussion of how this works is a bit beyond this forum but try these links:

http://www.atmsite.org/contrib/JSAPP/divide/divhead.html

http://www.jeffree.co.uk/Pages/divheadmk1.html

Book 6: The DIVIDING HEAD & Deluxe Accessories, D. J. Gingery: Discussion on building a worm wheel dividing head. Use the dividing head to make gears etc.

Thrud
08-14-2003, 02:17 AM
jrmason:
You can always make your own division plates. Many spacers have indexing rings or plates that can be replaced by other indexing plates. I am not familiar with your unit so I cannot tell you specifically about it.

Chances are that the chuck is a front mount (cap screws accessable from the front) unit and can be used on a good rotary table or dividing head - this usually requires a cnetering post to fit the table - it screws onto he back of the chuck and has a stubby MT or BS taper to fit your unit - thus centering the chuck precisely. The chuck is then bolted down using the t-slots.

So you have a nice chuck, but might be unhappy with the spacer - Cushman makes a good chuck - sounds like you got a good deal either way. http://bbs.homeshopmachinist.net//biggrin.gif


[This message has been edited by Thrud (edited 08-14-2003).]