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Wheel holding arbor.

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NickG:
Chris,

Would a stepped arbor be better with steps for the ranges of sizes you need. Then you will need some different bushes made up to enable the nut on the front to clamp, but at least this way you only have 1 source of error, the fit between which ever step and the disc as Stew said. Also, what is the range of hole diameters? If you use your method below, wouldn't some of the collets be extremely thin in section?

Nick

raynerd:
Hi Nick

I have since changed from this design a little Nick but in princible I`ll be using something similar to a steped arbor. I`ll post it up when I next use it again and thanks for the comments.

Chris

bogstandard:
If you end up wanting to do this sort of thing a lot, maybe you could invest in a set of these.

http://www.arceurotrade.co.uk/Catalogue/Expanding-Mandrels

I use the Straight Shank Expanding Mandrels (Quick Release) ones.

Or if you have slitting saw facilities, you can easily make up your own like these.

http://www.chronos.ltd.uk/cgi-local/sh000001.pl?REFPAGE=http%3a%2f%2fwww%2echronos%2eltd%2euk%2facatalog%2findex%2ehtml%3fhttp%253A%2f%2fwww%2echronos%2eltd%2euk%2facatalog%2fcatalogbody%2ehtml%26CatalogBody&WD=expanding&PN=Chronos_Catalogue_Miscellaneous_Milling_Accessories_101%2ehtml%23aSMA43#aSMA43

You can turn them down to various steps along the shank, so one can hold a few different sizes. Imagine doing it on the end of a blank MT arbor, it would be very easy to pop between lathe and RT on the mill. They are really dead easy to make.


Bogs

raynerd:
Thanks for the suggestion John. Chris

Darren:
I have used Arc's 5C expanding mandrels and can report they work wonderfully well.

Got me out of a fix when I needed to reduce a batch of sintered bearings buy half a thou  :dremel:

I couldn't see any other way of doing it, they were scrap otherwise ...  :)

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