How to search for a gearbox?

[SenSeS]

Hi all,

I've found a motor (I think) that fits my requirements. However I'm trying to find a spur gearbox (1:150) that goes along with it. How is this usually done? It seems that I can't find a general approach to this. When taking apart products with gearboxes I usually see one of 2 possibilities. 1) the gears are big, generally plastic, and spread across the product (printers, scanners, etc). 2) there is a custom gearbox designed that looks like something you would get when buying a geared motor but then placed in a special order or shape to fit the product. Are these the 2 prevailing options in commercial products? For a hobbyist project this is pretty expensive. It seems that there is no real collection of "standard" gearboxes that I can just attach to my motor. Ideally I would want the following shape of gearbox

The reason for this is cause it needs to be as short as possible. A worm wheel could work but is very inefficient. I'm currently looking at a Mabuchi DC motor. Thank you for your help!

[PSR B1257]

gearbox (1:150)

Why such a high ratio? Can't you use a different motor to start with?
Whats the application?

A worm wheel could work but is very inefficient.

Usually this does not really matter, if you have to choose a worm gear.

Why did you not buy a gear motor directly?

[wasyoungonce]

Have a look at McLennan gearboxes, spur gearboxes, ovoid instrument units...or such like.  I have used them in telescope drives.  But they are not that expensive..well not for what I want.

http://www.mclennan.co.uk/products/gearboxes-speed-reducers

I didn't see a 150:1 but they might in their other ranges although Polo has some:
https://www.pololu.com/product/2368

Also Maxon motors may have what you want but they cost a lot.  Most motor suppliers have gearbox options these days so it's best to search for a gearbox AIO using the motor mfgrs as a base.

[FrankT]

I find it is easier to find the motor+gearbox combo.  I don't know what your price range or precision requirements are, but super droid robots have a great range of motors with/without gearboxes, with/without encoders...

http://www.superdroidrobots.com/shop/category.aspx/gear-motors/7/

[Alex Eisenhut]

Without torque or power or something to give me an idea of what to look for, I'd send you to Hobby King to search for sail winch servos.