Building a model car-need help with mechanism Hi,
As part of my college technical fest,we need to build a small vehicle(max width-36cm and max length-about 20-25cm) which goes UP the slope of a wooden ramp with maximum speed and then goes DOWN the other side with minimum speed.Once set into motion,the vehicle cannot be interfered with i.e the mechanism should be such that it satisfies the above given criteria on its own.The vehicle can be powered by an xternal source.No microcontrollers and sensors can be used.
One of the ideas we discussed involved the use of a roller.The vehicle would have 4 DC motors,one for each wheel.As the vehicle goes up,the roller stays at the back;but as it starts going down the slope,the roller rolls forward(in between a pair of guideways) and hits a switch.This switch in turn makes the two forward motors start rotating in the reverse direction.
Another idea used a very simple principle.We use some sort of a lever that stays up during the upward journey and comes down(due to gravity)during the downward journey and strikes agains the wheels or the rotating shaft,acting as a hinderance.However,this wouldnt get us a lot of marks for creativity.
So now if anyone can help me with these ideas or give their own better ones,I'd be really greatfull!
Specifications of ramp:
Length of upward slope-120cm
Length of flat surface at the top-20cm
Length of downward slope-90cm
Max height-60cm
PS-I hope ive posted this in the right section! |