Gear boxes

**psycho_fling** · 4th April 2008, 17:10

hi all

what apart from gears do i need for gear boxes?

using mod 1 gears

alex

**widow_twanky** · 4th April 2008, 17:30

Depends what you hoe you want to put it together.

Cylons gear box has a spur gear on the motor (8mm shaft with a grub screw through the gear and shaft to hold it in place)

The other gear is screwed directly onto a wheel and runs on a 12mm stainless steel axle. This sits inside a plastic 12mm mount.

What I found was that it is good to drill the holes by sticking the gears in a lathe and you will need some tough drill bits as normal HSS will burn out.

Having driven it a bit it keeps veering off to the right but we (Well Froggy actually) came to the conclusion that this is probably to do with the fact that it needs a couple of washers either side of the gears to hold them in place.

We used the 150w gold motors, but should be the same for any of them.

I also found it ran better and took up less space if you cut the boss off the back and smoothed it over with the lathe. It also means youre not fouling the motor in anyway with the boss.

Andy

**maddox** · 4th April 2008, 18:06

An axle and at least 1 plate to get everything together.

**geeza** · 4th April 2008, 20:37

Depends what you plan, single or multiple stage reductions. Like Mario says, dont forget bearings in the plate if you have the shaft going round with the gear. Ideally each end of the shaft wants to be supported with a plate and bearings.

**widow_twanky** · 4th April 2008, 21:31

Yep, we did away with the bearings because its a fixed axle and it runs ok for the 20seconds it normally lasts in a fight.

Andy

**grant_ploughbot** · 5th April 2008, 00:28

As your looking at a 2 stage gearbox it will depend. Firstly you need 3 bearings inside the geabox if your output shaft is inline or near the input (you will want a support with bearing the other side of the wheel) or if the output axle can get to the back plate then 4 bearings in the gearbox with no support for the other side of the wheel, 2 aluminium plates (if its not enclosed and milled from a billet), 2 axles - size depending on bore of the gears.

**philip_taylor** · 5th April 2008, 09:51

What weight are all of your gearboxes? How reliable are the gearboxes as compared to a cordless drill?

**maddox** · 5th April 2008, 11:07

The gearboxes in the Hannibalitos never failed.(except the one time Little Hitter smashed the magnet in one motor- but that gearbox is still in use)

Weight, due the heavy motors, we can do it in a bit less than 1500 grams with 100mm wheels.