Ineresting 4 Jaw Chuck

mksj said:
A few of us have the 8" Bison version of this combination chuck, it is my primary chuck for anything over 1", otherwise I use my 5C collets. It has the benefits of a scroll, so quick stock insertion/removal and the precision of an adjustable 4J when you need to have minimal TIR. The repeatability of the scroll on mine is around 0.002". The Bison combination also has small jaw tips in contrast to most 4J independents, so you can hold stock as small as 0.200". I find it holds stock more securely than my 3J and less chance of twisting, and it holds stock in the axial (bed) direction more true than any of my other chucks. You can also use it for odd sized stock or irregular surface, this has been helpful in a number of projects. I have dual keys for the independent jaw adjusts, but really you can dial it in with in in less than a minute with a single key. I would take it over a standard 4J independent any day of the week, but then it comes at a price premium and it is probably 20+lBs heavier than my direct mount 4J independent that came with my lathe.

You may consider using some Evaporust on your chuck initially to clean it up, I wouldn't want to use anything corrosive like mild acids. Also keep track of the jaws relative to the slots, mine are all numbered. Look foward to hearing what you thing when you get it up and running.
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I don't think there was ever a tme when one of my lathes was that clean. Note to self: don't post embarrasing pics of your grungy machines.
 
I believe (or try to believe) that most of us have machines that are much less clean than Will's. Don't feel bad about not having spotless machines! :D
 
Randall Marx said:
I believe (or try to believe) that most of us have machines that are much less clean than Will's. Don't feel bad about not having spotless machines! :D
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No, but Will give us something to strive for....Clean machines!!!
:dancing banana:
 
mksj said:
A few of us have the 8" Bison version of this combination chuck, it is my primary chuck for anything over 1", otherwise I use my 5C collets. It has the benefits of a scroll, so quick stock insertion/removal and the precision of an adjustable 4J when you need to have minimal TIR. The repeatability of the scroll on mine is around 0.002". The Bison combination also has small jaw tips in contrast to most 4J independents, so you can hold stock as small as 0.200". I find it holds stock more securely than my 3J and less chance of twisting, and it holds stock in the axial (bed) direction more true than any of my other chucks. You can also use it for odd sized stock or irregular surface, this has been helpful in a number of projects. I have dual keys for the independent jaw adjusts, but really you can dial it in with in in less than a minute with a single key. I would take it over a standard 4J independent any day of the week, but then it comes at a price premium and it is probably 20+lBs heavier than my direct mount 4J independent that came with my lathe.

You may consider using some Evaporust on your chuck initially to clean it up, I wouldn't want to use anything corrosive like mild acids. Also keep track of the jaws relative to the slots, mine are all numbered. Look foward to hearing what you thing when you get it up and running.
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Oh fiddlesticks. Now you tell me about this chuck! I knew there were 4-jaw scroll chucks, but didn't realize the jaws were also independently adjustable for TIR. OK, I give up now - where, and how much? :)
 
Matt sells Bison chucks, and his pricing was the lowest I have seen, but they are also sold through Ajax, Grizzly and a few others. Bison Scroll Chuck - 8" Plain Mount, 4-Jaw 7-848-0800. Cost is about the same as a 6J Bison.
https://www.toolmex.com/itemdetail/7-848-0800
http://www.ajaxtoolsupply.com/biscc...biscch8plmo4&gclid=CNjp9-rs5NQCFURlfgodhq4Klg
I use a Gator D1-4 back plate, which is less expensive than the Bison back plate but you do need to do the final registration cut on the step to match the chuck. But I would check with Matt first, as his pricing with the Bison back plate may be close to the Gator.
http://www.gts-tools.com/catalog/products.php?id=FLD-200D4&cid=d-gab-a-pbsc

The 4J combo is my primary use jawed chuck, the PBA 3J scroll I use when I have a lot of repeat pieces to make or multiple in/out operations on a piece. I think it is all a matter of preference, but you do need to tweak the jaws to get the TIR down to zip. The nice thing is you can make sure that all the jaws have even pressure on the stock.
 
Chuck K said:
I finished taking it apart tonight. This one was made by Union Mfg. Interesting that you mentioned keeping the jaws in sequence. This one had the jaws all mixed up. I doubt that it has been used after it was last assembled. I'm curious to see how it performs. It's soaking in an electrlytic bath right now.
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I have one also. It came with my lathe.
Given the choice, why have a standard 4 jaw when you can have one like this?MVC-001L - Copy.JPG MVC-001L.JPG MVC-002L - Copy.JPG MVC-005L - Copy.JPG
 
Oops, this isn't a 4 jaw, but you get what I mean.
 
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