On 02/09/2016 16:52, Rob Graham wrote:
I posted a mail some 4 weeks ago about freeing up a garden shredder
which had seized through lack of maintenance - mine!!

Pressure from the head gardener(!) plus seeing how much a new one
would cost has encouraged the DIY approach with heat and brute force
enabling removal of the end plate. This allowed access to the
grinder wheel and the bolts to take the epicyclic gearbox off the
motor.

Because the grinder wheel goes so slowly, just plain steel bushes
carry its shaft in the aluminium housing and end plate. These bushes
are now running freely, but the end plate one came out with the
shaft, so will have to go back into the end plate first.

I guess this will be an interference fit needing heat / freeze.

The question is just how much - I can't do more than -20C for the
steel bush, but how much heat will the aluminium end plate casting
take?

Thanks for any help.



Hot air gun will give enough heat