Overdrive gearbox?

[ksafin]

Hi Dan,

We're trying to use a beatbox for our launcher, but want to gear it up for a higher speed and range.

I'll look into the AndyMark parts you mentioned, but I think we found a solution we may use.

The beatbox had hexspacers provided that fit on the output shaft;
Since we want the smallest gear on the output shaft and the largest gear to turn it, we're going to drill a slightly larger hole in the smallest gear, and then weld one of the hex spacers into this hole.

This will allow us to place this small gear on the output shaft, and allow for an upwards gear ratio.

[Dan Richardson]

That sounds like a cool solution! Using the adapter below and combining that with your welding idea would get you an awful lot of 1 stage gearing! This would also work with boring out and broaching a cluster gear for a 1/2"hex or finding an off the shelf output gear that matches your intent.

If you can use 2 stages and don't feel like modding anything another idea would be to buy one of these 8mm to 1/2 hex shaft adapters: http://www.andymark.com/product-p/am-0588.htm

Depending on what you need for gearing you could then use a 50 or 56 gear on the CIM to a 14 tooth or any of the cluster gears. On the output stage keep everything as close to 1:1 as you can, 50:50 may be an ok option. Or adjust as you need, it doesn't really matter because it's modular.

Hope this helps get you going!