Has anyone ever used Jacobs rubberflex chuck?

S

Ssonerai

AzB Silver Member
Silver Member
On their lathe(s)?

I have one on a small metal lathe (SB 10K), always loved it when parts/bars were a little bigger than 5c collet work. Thinking of adapting one to Hardinge nose = 1-1/4" thru bore + 1-3/8" collet capacity. Thinking it still might require bushings for non-marring. Curious before making effort, if it has been used before? Pros/cons?

smt
 
I bought a used one of eBay and had it for all of a week before selling it. For non tapered stock they are great but even with tapered collets I could not get the run out less than a couple thou. I know a few cue makers who use them but they weren't for me.

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str8eight said:
I bought a used one of eBay and had it for all of a week before selling it. For non tapered stock they are great but even with tapered collets I could not get the run out less than a couple thou. I know a few cue makers who use them but they weren't for me.

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Click to expand...

I have two...I love them. I hardly ever use my 3 jaw chucks.
 
Last year I actually bought a CAT50 taper "rubber flex type" off eBay dirt cheap & cut the taper off; then bored it to fit Hardinge nose. 2 problems occurred: I've not been able to find collets for it, and guess is they would be "quite" expensive.(seems to be German made) 2nd: with delrin bushings in it my experience has been as Str8eight posted: can't repeat closer than a few .001's. It's not the mounting, either.

It was"almost" successful, & I have 2 of the more common Jacobs both with complete sets of collets but neither fits a Hardinge taper nose as is. Based on my experience above, I've been leery spending the time to adapt one of them so other input is useful.

Canadian- do you still have to protect the shafts? With plastic bushings? Tape?Paper wrap?

I've only ever used 4 jaw independent, and Adjus-tru style chucks. Once both ends are dialed in, it gives a lot of confidence. But it would be nice not to have to do all that iterative indicating.

Someone should make nylon or delrin collets for a nose-closer collet chuck, like you can get nylon 5c's.

Anyone try plastic top or pie jaws for one of the Adjustru type chucks?
 

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Ssonerai said:
Last year I actually bought a CAT50 taper "rubber flex type" off eBay dirt cheap & cut the taper off; then bored it to fit Hardinge nose. 2 problems occurred: I've not been able to find collets for it, and guess is they would be "quite" expensive.(seems to be German made) 2nd: with delrin bushings in it my experience has been as Str8eight posted: can't repeat closer than a few .001's. It's not the mounting, either.

It was"almost" successful, & I have 2 of the more common Jacobs both with complete sets of collets but neither fits a Hardinge taper nose as is. Based on my experience above, I've been leery spending the time to adapt one of them so other input is useful.

Canadian- do you still have to protect the shafts? With plastic bushings? Tape?Paper wrap?

I've only ever used 4 jaw independent, and Adjus-tru style chucks. Once both ends are dialed in, it gives a lot of confidence. But it would be nice not to have to do all that iterative indicating.

Someone should make nylon or delrin collets for a nose-closer collet chuck, like you can get nylon 5c's.

Anyone try plastic top or pie jaws for one of the Adjustru type chucks?
Click to expand...
Yes I use delrin collects on everything except straight rough diameters.
 
Thanks for the input, everyone.
Guess there is no magic answer. :smile:

The delrin bushings made for above chuck were slotted to collapse.
Maybe I should make them more carefully, larger number of closer sizes, and not slot them. Or maybe try delrin top jaws on an adjust tru, next.

smt
 
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