s3.photobucket.com/albums/y99/alphapredator686/?action=view¤t=004-6.mp4 i talked to the guy he says he used a motor from a car powerwindow, any suggestions?
Hi mikeincan,
Welcome to the RobotShop Forum. The device seems to use a DC geared motor (wiper or other, it’s the speed and torque which matter). The motor connects to a pulley system (in this case what looks to be a bike chain), and the front traveller is connected to one or more links in the chain so it moves. The traveller would likely also have a guide rail so it remains straight. The rear blade is also on a traveller connected to one or more of the chain links and you can more easily see the traveller on the side of the unit. A stop switch at either end would help prevent it from moving too far. Take away the blades and the concept is the same as what is used on a forklift.
In order to choose the right DC gear motor, you will need to do some calculations, or take the approach of designing the blade system around what the motor can do. Design for the motor having to lift the weight vertically. You will also need to know the radius of the sprockets in order to make the calculation. A more compact (but significantly slower) system would use a DC linear actuator. The ideal system would use pneumatics.
Hope this gets you on the right track,