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lathe chuck (D1-5) and collets, $550,

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Seems like a good deal considering that it comes with the collets. The D1-5 is perfect for my lathe. Love the 1-3/8 max size.

But I have a really nice Bison already
 
But I have a really nice Bison already

A Bison Rubberflex?

I've got both styles (2J or 5C and a rubberflex) for two of my lathes, almost braces and a belt, but the do differ slightly in capability so worth having both.

It looks in pristine shape. Dude, you should be picking this up if you have a D1-5 :)
 
It looks in pristine shape. Dude, you should be picking this up if you have a D1-5 :)

Yes, my spindle is a D1-5. But I don't think the seller knows what a D1-5 looks like. I gave it another look to see what shipping would be. But one look at one of the other photos and it's clear to me that it's not a D1-5. It only has 3 camlocks.
 
I've certainly seen D1-6 setups with only three pins.
The wide end of the taper looks like... 3 1/4", roughly? Which, looking it up, is bang on for D1-5.
Harder to be sure about the camlock pins, but I'd call them 3/4", going by the tape.
(I appreciate that they step up in 1/8" increments, rather than something tiny, like 32nds)
 
Yes, my spindle is a D1-5. But I don't think the seller knows what a D1-5 looks like. I gave it another look to see what shipping would be. But one look at one of the other photos and it's clear to me that it's not a D1-5. It only has 3 camlocks.


From what I've found all the D1 series Jacobs chucks only had three studs. The A1 series has the full six. I've got one of each.

here are a few examples of a -5 and a -6
 
Other than cost saving, why do you think would they do that?
My guess is that it has more to do with the nature of the work. No matter what mounting size the chuck is, the max work size is 1 3/8" (Don't quote me, I'm not in the shop). So they must have figured the added weight and therefore momentum wasn't worth any added rigidity. Does make me wonder if having 3 cams floating is a great idea.... better trust they don't wing on outta there!

All that said, I LOVE mine. I use it all the time, only bummer is that the collets really aren't oil resistant, so if they were to be constantly flooded with oil they will break down. The size range on the collets is great for not having to have a million 5c's and still getting very repeatable eccentricity. I can turn a piece, take it out, put it back in and be within .0003" on the regular without trying hard.
 
All that said, I LOVE mine. I use it all the time, only bummer is that the collets really aren't oil resistant, so if they were to be constantly flooded with oil they will break down. The size range on the collets is great for not having to have a million 5c's and still getting very repeatable eccentricity. I can turn a piece, take it out, put it back in and be within .0003" on the regular without trying hard.

I love my Bison 5C too. I often tell folks that I have 6 chucks but the 5C lives on my lathe more than all the others combined. Like you, on my 5C, I don't worry about repeatability. It's always within a few 10ths.

Your thoughts on leaving out the 3 studs makes some sense, but if you are working on an arbour, you could be swinging a lot more than 1-3/8ths. I am doing just that right now. This one is about 4 inches OD.

I can see no downsides to using all 6 cam studs. Maybe I am missing something though.....
 
So, I shouldn't be using a collet chuck to work on things like arbours?

, This is opinion not finite element analysis .... don't worry about it. not knowing how long a piece of string is, I mean how big an arbour is :), it's still a beefy mount and the spindle is designed to hand the extremes without issue: biggest lathe, chuck size, biggest work, biggest cuts etc.

Each D1 size has a specific pin size, so if he has even a rule and a portion of a brain, hopefully he can measure and confirm. :)

E is pin size

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