Spin indexer for R8 collets?

The $30 spin indexers at all the usual outlets only take 5C collets. Is there a budget indexer that takes R8?

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Rex Burkheimer
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Ive never seen one, and it would be pretty limited in usage if anyone did. It should be simple enough to make a replacement spindle for one though.
Gunner
Lathe Dementia. Recognized as one of the major sub-strains of the all-consuming virus, Packratitis. Usual symptoms easily recognized and normally is contracted for life. Can be very contagious. michael
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Gunner wrote:

Why would an R8 Collet be any more limited than a 5C?
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Rex Burkheimer
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R8 is closed on the inside end to accomodate the drawbar. 5C's are threaded on the outside, so they can accomodate long stock.
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Don Foreman wrote:

anyone
one
R8s were intended to hold cutting tools in a quill or spindle, 5Cs were for holding stock to be worked on in a lathe. I doubt if the O.P. will find any tooling designed for R8s and stock-holding. How would you draw down an R8 collet without a drawbar? The 5C indexers and blocks use nuts or retaining rings on the outside threads to do that job. And 5C collets and tooling are so cheap it's hardly worth trying to figure out how to use R8s for something that they weren't designed to do.
Stan
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snipped-for-privacy@prolynx.com wrote:

OK, guys, I'm sold!
Thanks much for the detailed responses. I'll plan on another set of collets.
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Rex Burkheimer
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Hi Rex,
In addition to the single major limitation pointed out by Don (being able to pass long stock through a 5C collet), there are additional advantages to 5C collets over that of R8:
1. A 5C collet is rated for diameters up to 1-1/16", whereas an R8 collet is typically no more than 7/8". There are some special R8 collets that are larger, but they are not common and have an even shorter throat depth than regular R8 collets.
2. 5C collets can be readily purchased in round, square, or hex styles, whereas you'll be hard pressed to ever find an R8 collet that isn't round.
3. 5C collets are available in soft alloys (and even plastic) for custom machining your own size collet.
4. You can get expanding 5C collets for gripping the inside of a bore.
5. You can get 5C faceplate fixtures (common up to 6" diameter) for making custom jigs.
6. You can get 5C collet stops to quickly set and repeat the depth of a part in the collet. This makes for much faster work when machining many small parts to the same specs.
7. You can get 5C adapters or chucks for lathes.
Realize that 5C collets are intended for holding work pieces, while R8 collets are intended for holding tooling.
Regards, Michael
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Because R8 collets only come in about 8 or so sizes. 5c comes in all shapes and sizes. Hundreds of them. thousands
Gunner
Lathe Dementia. Recognized as one of the major sub-strains of the all-consuming virus, Packratitis. Usual symptoms easily recognized and normally is contracted for life. Can be very contagious. michael
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