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There are two good search terms that come to mind. The first one is a "candy machine mechansim", or "dispenser mechanism" (e.g. http://www.woodworkingformeremortals.com/2012/10/make-candy-dispenser.h …

Carbon fiber would be great if your design is in a fairly final state, but are you 100% assured that you correctly determined all the thicknesses, mounting holes, wiring guides, etc? …

An orrery just represents the different speeds at which planets orbit the sun by careful selection of gear ratios. Here is a set of plans that define the gears themselves, but you could calculate t …

The problem appears to be that your drive motors are providing too much torque. In other words, there isn't enough friction between the wheels and the floor to counteract the force that the motors ar …

It has more to do with the rocker bogie suspension than anything else. The system is designed to be used at slow speed of around 10 cm/s, so as to minimize dynamic shocks and consequential damage …

I think you've taken a good first step; you've divided the problem into a mobile platform (which has uncertainty of position and must navigate) and the arm (which has a fair certainty of position in r …

You're trying to implement more PIDs than you have degrees of freedom. In a quadcopter, you have only 4: $(Z, \phi, \theta, \psi)$ i.e. (Altitude, Roll, Pitch, and Yaw). via (http://www.draganfly …

To answer your questions directly, the X-shape is not the only design that will work. … There are many variations of frame design around a number of rotors that can range from 3 to (in some cases) 8. …

There is no right answer. However, I think I can clarify what you've read so far. You need a buoyancy engine to supply the thrust, wings to direct that thrust, and some ability to change your pitch a …

However, in the initial design of the vehicle you should be placing the contact points of the suspension system in line with the vehicle body's center of mass. …

There are some hybrid approaches -- 4 tracks, non-skid steering -- that approach a "best of both worlds" design: Mattracks and hagglunds, for example. …

Instead, you might look at techniques like Burmester's theory to design the proper kinematic linkage between them. (In the Ackermann solution, it's a 4-bar linkage.) …

It sounds like the simplest option would be to put the grease into a pressurized container (e.g. spring-loaded) and control the metering by just opening and closing the valve. That would mean you jus …