Ball Nose End Mill / 10V Bearings Question

[Dr_GMJNParticipant @dr_gmjn]

Understood. Thanks.

Wish me luck..

[Dr_GMJNParticipant @dr_gmjn]

This is the new 11mm tool, as tested in aluminium:

Pretty much perfect – it didn't need any more side cutting on mine, so with some trepidation, on to the real thing:

Went through the cast iron beautifully. Unfortunately I centred the casting on the inner edges of the standard flats, double checking it with the insides of the cast bearing housing prongs. Result is that the brass is slightly offset to one side (obviously the right on the image above), but centred on the inside edges of the base. I should have thought more, and used the outside edges of the bearing housing prongs.

Anyway a few passes with a fine file and it’s not really apparent, but lesson learned. I'm still waiting for the silver steel for the spot facing tool. BTW I put a thin coat of red oxide on the casting becasue I find it much easier to see where I'm marking or initially cutting that way.

As ever, thanks for your help. Any comments welcome. Onwards…

[Mick B1Participant @mickb1]

That's a nice piece of work, Doc – can't see how it could be any better.

[Dr_GMJNParticipant @dr_gmjn]

Posted by Mick B1 on 21/05/2020 21:43:53:

That's a nice piece of work, Doc – can't see how it could be any better.

Thanks very much Mick!

[JasonBModerator @jasonb]

Last post moved to the build thread.

[old martParticipant @oldmart]

The chances of anybody noticing that the end rad did not match the shank are very small. The need to fit two parts together with such a good match is a very demanding and rare thing. Ball ends are usually used for rads in corners or channels which don't matter so much.

[Author]

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