Bison chuck

[rficalora]

What are these allen head screws for? It's a Bison, 3-jaw, self centering chuck. There are two larger and one smaller aligned with each of the jaws.

 

[jbaccell]

I would imagine that those screws are for assembling/disassembling the chuck? I did not see any screw on the face in the photo that you uploaded.

 

[Uglydog]

Attached is a link to the Bison website complete with free copies of their user manuals.

Instruction manuals - Bison

bison-chuck.com

While I don't know the model of your chuck the cut away diagrams in the manuals which I looked at all showed the screws that you are asking about.
They are well done manuals for a great chuck!! Lots of data in there worthy of study.

Daryl
MN

 

[Cadillac]

The Allen head cap screws are for holding the chuck to the backplate. The threaded screw holes are for separating the backplate from the chuck.

 

[Provincial]

The technical term for the screws used for disassembly are "forcing screws." Usually, they are threaded full length, and often have hex heads.

 

[Richard King 2]

I found this on repair of a Bison Chuck. https://www.bing.com/videos/search?...5B31BB30BB2ED450F6525B3&view=detail&FORM=VIRE

 

[rficalora]

Thank you all! Excellent information.