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Stub Mandrel in Aluminium

WIll it work

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Iain Downs11/07/2019 18:26:00
516 forum posts
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I want to turn the back side of my flywheel (1 inch deep, 6 inch across) mounting it on a stub mandrel.

It has a 22mm bore.

I have no steel around that size, but I do have a piece of 25mm aluminium bar which could be pressed to service.

Is that a good idea? Or is it to soft?

Just to add a note, I then need to turn it round and finish off the first side so it needs to go on twice.

Thanks

Iain

Michael Gilligan11/07/2019 18:40:15
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Posted by Iain Downs on 11/07/2019 18:26:00:

I want to turn the back side of my flywheel (1 inch deep, 6 inch across) mounting it on a stub mandrel.

It has a 22mm bore.

I have no steel around that size, but I do have a piece of 25mm aluminium bar which could be pressed to service.

Is that a good idea? Or is it to soft?

Just to add a note, I then need to turn it round and finish off the first side so it needs to go on twice.

Thanks

Iain

.

If you really mean Aluminium, Iain ... then yes it's probably too soft

But if [as I suspect] it's an extruded hard alloy then it could well be O.K.

... First test would be to see how cleanly it turns.

MichaelG.

JasonB11/07/2019 18:45:12
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Have you thought of holding it by the inside of the rim, you will get less vibration/chatter than is likely on a mandrel

Iain Downs11/07/2019 20:02:43
516 forum posts
397 photos

It's not pure aluminium - I had some of that a while back and it was HORRID to work.

It turns very very nicely. Much better finish that steel or cast with more or less any tool.

I hadn't thought of holding it by the inside of the rim. I'm not convinced that the chucks I've got extend that far.

However, it's worth giving it a go. Chatter is a problem with my machine pretty much all the time, so no need to make it worse!

Iain

JasonB11/07/2019 20:12:15
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You should be able to do it with the jaws reversed and still have plenty of jaw in the chuck body

Iain Downs15/07/2019 21:08:16
516 forum posts
397 photos

I did as suggested and just about the other side sorted out. The wheel was about 0.1 mm off centre held in the 3 jaw on the inside.

After taking off the bulk of the metal this way, I reverted to the aluminium stub mandrel to finish back to more accuracy and it worked a treat.


More details on my build log...

Iain

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