Making nylon/plastic gears for Kenwood mixer

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Making nylon/plastic gears for Kenwood mixer

Postby Doive » 10 Nov 2006, 22:50

I've got myself a beautiful old Kenwood Chef A701 mixer of about 1965 vintage. Using it this evening to make some good old irish soda bread, all was going well until something went 'snap' and the beater stopped turning in the hub. Put the bread in the oven, pulled the hub off the gearbox and it immediately became clear that the force had destroyed the 40 year old nylon planetary gear. I could buy a whole gearbox second hand, but I'd rather have a crack at making the gear from scratch.

What I was thinking was, put the old gear back together, make a decent wooden mould using a precision tool, and then fill the mould with a suitable heated plastic that cools firm and strong, white if possible. Anyone got any experience working with plastics like this, and anyone know where I could source a suitable plastic?

This is exactly the same as mine:

<img src="http://www.makingthemodernworld.org.uk/stories/the_rise_of_consumerism/02.ST.03/img/IM.0389_zp.jpg">
Last edited by Doive on 11 Nov 2006, 00:32, edited 1 time in total.
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Postby CancerWagon » 10 Nov 2006, 23:08

Would model casting resins (or fiberglass resin) be strong enough? Probably too brittle but good for testing your casting if nothing else.

Many plastics companies seem to polymerise the nylon in the casting process..... :? .......

Definately an interesting project. :)
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Postby Neilyman » 11 Nov 2006, 08:07

You could try this stuff Doive, I make model parts from it.

Hand mouldable plastic

It `sets` like a tough nylon polymer, it won`t snap, & it`s strong.

& it`s reusable, so you can experiment! ;)
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