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Material for tapered mandrel?

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Philip Rowe23/01/2021 12:16:53
198 forum posts
20 photos


I want to modify some aluminium bushes, top hat in section, 10mm bore and around 25mm long. The only way that I can now hold them to turn the new diameters is with a tapered mandrel as there is insufficient material to grip in a chuck or collet. My question is what is the most suitable material to use for the mandrel that will provide sufficient grip and not jam in the bush when it comes to removal? I only need to take around 0.4mm off the bushes so will only be a very light cut.

I've been a model engineer for over 50 years and have only ever used a tapered mandrel once before to grip loco cylinders for facing the ends and I cannot remember what I used!

Thanks in advance for any pointers.


Andrew Johnston23/01/2021 12:27:27
5929 forum posts
666 photos

I'd use a split bush, like this one used to machine the OD and face of the spigot and inner face of the flange:


The central hole is 9/16" for scale.


Philip Rowe23/01/2021 13:47:56
198 forum posts
20 photos

Thanks Andrew, why l didn't think of that I don't know. Obvious really and no potential problems involved with removing the bushes from a tapered mandrel.


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