Feather weight motor suggestions......

[psycho_fling]

hi all

i am currently in the process of designing a new robot. it wont be anything exciting just a push bot. but i need suggestions for motors, i may go with 2 or 4 wheel drive unsure st the moment. drill motors are slightly to big and im working on a small budeget, upto £40 for a pair. so what to use?

if addiontal info is needed ill post later

thanks alex

[blazerbotics]

Feather weight motor suggestions......

Gold motors are about the best bet, £25 each.

[cavecrusher]

Feather weight motor suggestions......

speed 900 are better, just £20 each, will run from 9.6v up to 36v no problem.

[Mouldy]

Feather weight motor suggestions......

Speed controllers to handle them are alot though.

Gold motors with the right gear ratio give good results.

[cavecrusher]

Feather weight motor suggestions......

not really, at 12v you can use the cheapo ones Leos importing from Asia, so a working motor/speedo for £35.

[killercarrot]

Feather weight motor suggestions......

Alexander only has £40 guys...if the motors cost £50, and he has to add gearing hes stuffed..

the drill motors will be the cheapest route.. Alex are they too big in physical terms or in power rating for whatever speed control you plan to use?

if in physical terms, then maybe consider taking off the chuck and fixing the wheel direct to the spindle, which will make them shorter..

Or go for 2 wheel drive on a 4 wheel robot, and put the drive wheels on opposite angles..
so front right, and rear left.. this works fine, and means you can have a wheelbase width of around 200mmm with normal blue wheels (I have done this on a sumo bot)

If you want basic speed control aradilte a a couple of microswitches to either side of a cheap 3003 servo, so in the centre it switches neither, and at either extreme it switches one way or the other..
this set up will costs about £6 for the servo, and £2 for the switches for each side.. so £16 for control, add a couple of £12 drills, and you have all you need for £40, minus the radio gear.

[jamesb]

Feather weight motor suggestions......

i think i know why the drill motors are too big.

i suggest you follow Robs suggestion of one drill in each corner. It works great on little hitter/flipper.

[RogueTwoRobots]

Feather weight motor suggestions......

Are you looking to have the wheels contained within the robot or are you gonna make wheel guards for it? (Im assuming this is for the metal chassis )

If youre going for the wheel guard approach, then Id agree with the diagonal drive system mentioned with the drills. If youre wanting the wheels contained then possibly the only option due to the height of the chassis would be zeobot motors (then again, theyre ~£40 each rather than £40 for two).

width of around 200mmm

Is that 200 milli millimetres then

[jamesb]

Feather weight motor suggestions......

if you are putting wheel guards on, you have no problem. 4 drill motors fit in that chassis, with the wheels outside like king buxton. adding guards is then easy.

[psycho_fling]

Feather weight motor suggestions......

thanks for the suggests

i was just wondering if i was to use the drill motors in suggested arrangement, how would you keep the other two corners from touching the floor? BTUs?

its just ive never seen this done before.

thanksa alex

[psycho_fling]

Feather weight motor suggestions......

Im not ruling out the other suggestions, but where would these be purchased from?

the speed 900s
or the gold motors

thanks alex

[simon]

Feather weight motor suggestions......

You put a wheel on each corner, but only 2 are driven.

[killercarrot]

Feather weight motor suggestions......

look at this here robot wot I built...
http://killer-carrot.blogspot.com/http://killer-carrot.blogspot.com/

it shows the layout of the wheels, and the attachment.. obviously this is a sumo bot, so its ok to use old bits of pneumatic pipe as axles.. I suggest for fighting at 12kg you use something a bit tougher.. but the principle is the same

[blazerbotics]

Feather weight motor suggestions......

http://www.technobots.co.ukwww.technobots.co.uk for the golds
http://www.sussex-model-centre.co.uk/shopexd.asp?id=1206http://www.sussex-model-centre.co.uk...xd.asp?id=1206 for speed 900s (although its probably worth asking at a few model shops see if you can get them cheaper)

[psycho_fling]

Feather weight motor suggestions......

ok thanks ill research all the suggestions

cheers alex