Wanted. A supplier of imperial R8 arbour.

I am finally getting to grips with my Bridgeport mill and have the need to use some slitting saw / face mills. I already have between 50 - 60 of the saws / cutters but have found that my R8 arbour has probably been used without the key in it, in the past and has got hot, causing wear. This means the tool does not run true.

I have looked all over the web for an R8 arbour to hold cutters with a 1" bore, with a key way, but cant find one. There are plenty without a key way, although I cant see how this would grip the tool well. I have also spoken to several tool suppliers who laugh when I say I need imperial not metric.

Does anyone know of a supplier that sells what I need, or, does anyone out there have one for sale?

Have you searched for 'R8 1" stub arbor'

..Arc Eurotrade..

..there's also an Arrand on Ebay right now...

You don't need a key for slitting saws, the rotation of the cutter is contrari-wise to the holding thread, so that it tightens itself.. ..life would be so much cheaper if only they did slip..

If the slightly longer version described above is not to your requirements, a shorter version is available from Chronos:

https://www.chronos.ltd.uk/product/r8-stub-slitting-saw-arbors/

Many thanks to you both. I will definitely be looking at those suggestions later.

Before I order, I’m curious; some of the cutters I have for this arbor are 0.5 inches deep/thick and others are 5 inches diameter. All have key slots including the thinnest ones. Can they all be used without a key and, if so, why do they have a key way in the bore?

The thick cutter shown is intended for use on a horizontal mill, not an R8 arbor which is for slitting saws. Slitting saws are best used without a key, so they slip if jammed. The forces through the thick cutters are much higher and they are used with keys and spacers on horizontal mills.

Edited By old mart on 27/08/2023 17:29:25