Where to buy Bosch 750's or alternatives

so motor bike starter motors can usable and can acually give some good results?

but the more i look the more im thinking once i have the stuff for my featherweight ill just gradually start saving up.

i can save on postage for the 2 750's since its not far from us, i know were to get cheap steel etc aswell.

now, forgive me if this is a very stupid question but for gearing etc, what is better? timing belts or chain and gears? and what is the best place to buy them? and what would be best for a 1:2 increase or a 2:1 reduction?

Chains are more efficient at transferring movement than belts however belts are more forgiving of misalignment. Belts are also lighter.

6 and half a dozen as to which is best as it depends on your application, machining skills etc.

Forgive me if I'm wrong but are you planning on using this gearing for drive? If so I think you will find you need a much bigger gearing than 2:1 unless you are using tiny wheels.

i would be using 26cm wheels but i am unsure of motor as of yet? what gearing would you recomend?

'the biggest possible sprocket/timing pulley you can fit on the wheel and the smallest possible you can fit on the motor shaft' seems to be a good rule of thumb...most heavyweights use reductions between 8:1 and 15:1 though, from memory. There is a handy calculator on the Technobots site that lets you plug in a desired speed, the speed of your motor and your wheel size and gives you a good figure to begin with.

With 260mm wheels I would recommend a higher reduction. You can never have too much torque.

Alternatively use smaller wheels.

so, bosch 750's which as bigger reduction as i can get using 260mm wheels should give me a fairly good robot :)

that costly parts come later, right now all im after are 2 motors which get a good amount of speed and torque with the wheels i have and 2 batteries to power them.

get a good plan drawn up and then get the motors and batteries in the body shell and then take it from that

for a rough guide gear bosch 750's down by the width of your wheels in inches rounding up. ie 260mm wheels= 11:1 gearing

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and part of me feels very odd that a robot Wars champion quoted a table I made

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This made me chuckle :lol:

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Originally Posted by typhoon_driver

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and part of me feels very odd that a robot Wars champion quoted a table I made

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This made me chuckle :lol:

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not being funny but someone behind that machine called typhoon 2 can be called a legend in my books :)

one thing, the Scorpion Commander 110A ESC V1 aint heavyweight usable is it? goin with gary's theory of 'if its too good to be true, then it normally is' but i just want too be sure since it says 110a continuous

110a continuous is probably the manufacturer's rating for the FETs (the little things that do the current switching) under ideal conditions, which you aren't really going to get in an R/C car speed controller, so I'd say it is indeed too good to be true sadly :(

Especially since a quick Google reveals that the Scorpion Commander is a brushless motor controller.

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Originally Posted by typhoon_driver

This made me chuckle :lol:

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I'm not used to it :lol: especially for something I knocked up randomly as a fanfic reference, hehe....