4:1 2 speed planetary gearbox
by BoilerPlateDan, published
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There could be a way but it would involve changing the number of teeth on the gears and rings. Or you could couple it to a 1:12.5 ratio box to get your 1:50. It might be an idea to see what other boxes people are posting to simplify things for you
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I set myself the challenge of producing a 2-speed planetary type gearbox and here is the result of a few nights tinkering.
A bit of info for you:
The design uses MOD 2 gears so itâ€™s a little smaller than my last gearbox.
The ratios are 4:1 (or 1:4 depending on which way you mount it) and 1:1
The speeds are changed by pulling or pushing the M6 bolt which connects to the selector forks
I havenâ€™t made it but it should be buildable. Some bits may need a little further tweaking or clearances adding.
My design is 6mm MDF (I know, itâ€™s a pattern). You should be able to print it though with a bit of playing around.
For those who are looking to build this, youâ€™ll need to look at the parts list (a jpeg has been uploaded). There are quite a few parts needed, perhaps someone can simplify it?
Unfortunately I canâ€™t give you any step-by-step instructions. Iâ€™ve added a couple of exploded views which you should be able to work out how to put it together from.
I've just realised that the original parts list shows 4 no. 12 tooth gears (all the same). This isn't the case- there are 3 no. 12 tooth gears with a 6.25mm bore and 1 no. 12 tooth gear with a 6mm bore. I've changed the parts list and uploaded it as V2.
I've also uploaded the flat parts as requested. I've just dropped them onto a blank drawing sheet so you'll need to nest them to suit your machine/ remove the centre-lines etc.
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