Im toying around with ideas for future, more complicated robots. I just wondering, probably Nick can help, how the Whyachi right angled Gearboxes work. More specifically what gears are used and how they all line up.
This would be for a low spinner where the motor lays on the chassis too keep things as low as possible aswell as being capable of high rotations. I know you can just buy their gearboxes with MagMotors and everything, but just curious as to how its all set up.

Thanks, Chris
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Chris, Team Collo
:::Is the answer to this question "no"?:::

Right-angled gearboxes usually have what's known as bevel gears:



Most of the commercial units are much too heavy for small robots, which is why the Whyachi aluminium one is so handy. Spockie-Tech has adapted the gearbox out of various angle grinders for his bot I.G., but they are not really able to take sustained punishment from a spinner blade. Making your own from scratch is difficult; you would need a lathe and probably a mill to do a good job.

Thanks Nick. Do you have any pictures of the Whyachi gearbox your using?
And is there much weight and size difference between that and a angle grinders one?

Also, would a worm gear onto horizontally mounted gear work or would there be too much stress for most worm gears?
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Chris, Team Collo
:::Is the answer to this question "no"?:::

the whyachi ones have solid ass bevel gears with large bearings and all in a solid block of ali so id say they would way a bit more.
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Tim Team Reaper.

Correct, the Whyachi gearbox weighs around 1.9 Kg, but you absolutely get what you pay for. It has far larger gears that still look like new after 3 years, large bearings that have only had one problem in the same time and a 1" lightweight Ti shaft that most people (except me!) never bend. An angle grinder gearbox has a .5 to possibly 3/4" steel shaft (only in the latgest models) and much smaller gears.

The real difference is the mounting and the coupling to a motor; the whyachi is purpose made for that. Unless you get a huge angle grinder for free, the Whyachi is worth it.

Just for a balanced discussion, the other way to do this is a flat (pancake) style motor and belt drive to a shaft mounted in bearing blocks - a classic example is Bender.

Some more right angle questions;
1. Has anyone seen or tried Helical Gears? Anyone think thesse gears could handle a few thousand rpm?

2. Gary, with Badger, how is the spinning shaft connected to it's base? All i could think of was bearings between the shaft and chassis, but I'm not sure whether bearings would be able to handle the pull.

And yeah, im asking all this because i want to make a Shell Spinner after I become a bit more competant at building. In an attempt at making one that is extremely low, 5cm?, and won't 'Do a Mauler'.

Thanks, Chris
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Chris, Team Collo
:::Is the answer to this question "no"?:::

Helical gears would work, just size them right and take into account the need for thrust bearings. for a given load, crossed helical gears will need to be heavier duty than the equivalent spur gears.

Helical gears would work, just size them right and take into account the need for thrust bearings. for a given load, crossed helical gears will need to be heavier duty than the equivalent bevel gears.

Double row ball bearing.
Badgers shell is designed to flex so the bearing doesn’t take too big a hit.

The shell hits on 4 rubber tyred wheels when it flexes and they distribute and absorb the load.

I will try and get Rob to do a drawing, no idea where he is so that might take a while.
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the whyachi gearbox has helical bevel gears right?
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