Team Avenger build diary

**psychostorm** · 19th August 2011, 18:14

Originally Posted by mattsdragons

Dodgy picture angle ceri, the wheels are level

Can't be, it isn't parallel with the paving slab it's sitting on -Top wheel is, bottom wheel isn't. Either your wheels aren't or the slab isn't square.

**mattsdragons** · 19th August 2011, 18:25

On closer looking, it does appear slightly off yet explain why it goes to the right?

**TEAM ENIGMA** · 19th August 2011, 18:40

Apart from the wheels, looks good. Hopefully you should be able to get it running in a straight line if you move one of the wheels and motors round slightly

**mattsdragons** · 19th August 2011, 18:49

funny thing is its fine in reverse

**psychostorm** · 19th August 2011, 19:56

I can explain that:
Tank steering works on the principle of two drives equally parallel & exerting equal forces.

Your right wheel is angled inward which means the robot pushing into a counter clockwise spin & being the dominant force, is drifting the robot right. Your left wheel skids.

When the robot reverses, the right wheel is angled outwards & is the weaker force of the wheels. Right wheel skids & the bot generally follows the left wheels direction.

If there's some handy and it fits, map your drive out on square/graph paper. It'll help affix your drive down to a minimum of drift error.

You could use someone like me on your team, Matt!