Anyone know of a good 8mm (5/16") -- 1/4" (6.35mm) reducing bushing

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Finally got my Mafell FM 1000 WS:

WIN_20210224_19_04_21_Pro
WIN_20210224_19_04_21_Pro4096×2304 1.35 MB

Need to work up a mounting plate and dust collection option (also curious if I can find a small binder which will fit the loop staples for the manual), but a slightly more pressing issue is the collet situation.

It natively fits 8mm tooling of which I have some, but not much, and there was a 1/8" collet available, but the other size was 6mm, which despite being described as 1/4" on the product page:

https://katalog.mafell.com/index.php?IdTreeGroup=13380&IdProduct=34438

does not fit 1/4" tooling.

I’ve ordered an Amana RB-106, and have an e-mail in to the sales folks at Elaire Corp. to try to have one made up, but was curious if anyone else knew of any other 8mm–6.35mm reducing sleeves, or a machine shop which could turn down the 6mm sleeve I have to an internal diameter of 6.35mm.

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Here’s a close fit… McMaster-Carr

If it’s too tight on the ID (0.243") then I bet there’s another option there somewhere.

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Thanks!

The Amana RB-106 is the right size:

so anything else I try should be as well. Characteristics I’m looking for:

  • better concentricity/diameter specs
  • better balance — this Amana reducer only has one slit — I’d like to see a product which has the opposed slits of the Mafell reducer
  • wider end to ensure consistent installation

I’d also be interested in suggestions for 8mm tooling to try.

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So, you could order that bearing stock I found, cut it to length, and turn the ID a little wider…

Or buy that correct part for $1.

Your call. :wink:

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I’ve already ordered the Amana part (it was $5.06 plus s/h) — I’m hoping that there’s a better option available.

If I had a metal-working lathe, I’d try boring out the internal diameter of the sleeve I have — if anyone knows of a machine shop which would be willing to do that, I’d be glad of their contact information.

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@cgarman 4130 may be hardenable, but it’s not bearing stock and 3/16" is under 8mm. Either way I get the idea @WillAdams doesn’t have a centerless grinder. For the kind of rotational speed on this beautiful new spindle of his, the GD&T is far tighter than what someone can make at home.

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