first robot

STOP BUYING THINGS , got your attention ? :proud: . scooter wheels and those motors are great, but you are gona have one hell of a job finding a belt to fit those wheels and motor, and there is absolutely no guarantee that they will have the same teeth spacing, i have seen electric scooters with completely different belts that would not fit each other, so its not unreasonable to assume that your motor and wheels will not be the same, in which case you have wasted your money definitely on the wheels and possibly on the motor. Keep the motors you bought in a cupboard somewhere safe for your NEXT bot, an go get some 10 quid argos drills and blue wheels. It really isn't nearly as easy as you think to get a working effective drive train from those motors, with a little experience under your belt though, its very much possible :). Even very very experienced roboteers pay large sums of money for pre made geared motor units with more power than drill motors.

So buy some drill motors and good luck :).

agreed. I went down the custom route when i started featherweights. Spent around 100 quid and whilst it worked well, it only worked well because i invested in a lathe.

I would only advise a custom drive train outside a drill motor assembly with access to a lathe. It's doable without but its so much easier with. I got lucky and bought a small lathe second hand off a guy on here a few years back.

Get yourself some drill motors and go down that route initially.

:rofl: i knew you guys would say that.
im taking your advice and buying some drills once the snow is gone.

haven't got the drill yet, but who and how do i contact to get the wheels and mounting kits i have heard about?

contact james or grant cooper robochallenge

sent grant a pm, waiting for a reply with some info about the wheel sizes and price

might be better to email

they are pretty busy atm so might be a while before getting a reply

I think Grant's in Dublin isn't he?

got a reply from grant. waiting for him to get back with the full price so i can send a cheque

good good :), can go wrong with blue wheels :).

Quote:

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Originally Posted by muchalucha

good good :), can go wrong with blue wheels :).

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can or cant?

also just got the drills and speed controllers delivered, just waiting for the batteries and for robochallenge to get back with full price so i can send a cheque.

cant hehe. what esc did you end up with? also are you using 2 or 4 drill motors ?

i got 2 electronize FR12VR, and im using 2 drill motors thought 4 may cost too much for mounting kits and stuff.

good setup there :). good luck and be sure to start a thread in build diaries.

thanks, il make a thread once i get all the stuff.

started work on the robot, got the base shaped and and holes cut for the wheels.
il start a build diary when i find the charger for my camera.
EDIT: found my camera charger, il post some pics of what i have done so far tomorrow.

anyone have any suggestions for the front wheels, i want to keep the ground clearance low and was thinking about using ball transfer units like the item at the topvhere:
http://www.technobots.co.uk/acatalog/Sh ... s_392.html

anyone think it will work?

You could make a good front skid out of UHMW (aka poor man's teflon).

Even a round headed bolt might work.

thanks, il have a think about what will be best once i get my wheels attached they should be on tomorrow if the pop rivet gun i bought of ebay arrives.
EDIT: what you mean by front skid?

a part of the robot that skids along the ground without a wheel

ah, ok thanks il wait untill i get my drive wheels fitted and see where i can go from their.

I meant a skid over a caster/ ball transfer.

Also, rivets can be a massive pain to remove, particularly if ther are lots of them in your design.

i think il go with a skid then, i have some wood that i bought by mistake for my DT project in school, maybe it will be good to make a small frame out of.

i have mounted the drill motors to the robot but when i turn the transmitter on one of the wheels just continuously spins. its not the first time i conected them up to the reciever, it worked perfectly last time.
anyone know what might be wrong?
EDIT: just reconnected everything again and it worked fine. im still using my dads transmitter from his rc car just to test it, i should be getting a new one by the end of the week.

havnt got the transmitter yet, found you though that i need to get bigger wheels. im going to order the 100mm instead of the 75mm wheels next week.

Sorry to bump this topic, but I've read it from start to finish and it's pretty interesting, have you made any progress on the bot?

Unfortunatly i havnt got the time right now to continue the build for a few months because of exams :( , i should be able to start back in june/july when exams finish and i have more time and money.

sorry i didnt post earlier my parents keep on stealing my pc and hiding it :lol:

just messaged grant to order some 100mm wheels, the 75mm had trouble touching the ground.
i got most of the base of the robot done, but im thinking about scrapping it and getting a more sturdy base before i continue.

You can order them online now http://web.me.com/robochallenge/Robo_Ch ... Store.html

thanks, didnt notice that.
guess il order them off their instead.