What is the smallest way to get a ball to roll 360 degrees in a socket/casing? Would a ball within a hollow half-ball work or would there be too much friction? If the surfaces were hard, smoothly polished plastic, would this solve the friction problem? Thank you,

I am a machinist and want to make a thermal actuator for a green house vent. Where can I obtain the proper type of paraffin and what is it's composition?

I'm trying to figure out the instantaneous torque required to wheelie my bike in order to develop gearing proper to roll on 2nd/3rd gear wheelies. In first - it will wheelie after 4k rpm with ease. Bike makes 63hp @ 7500, 47 lb*ft tq @ 5900. At 4k, its around 40 ft lb. With the gearing - 1st...

Insi of mechanical engineer(india) ime is equvelnt to Regular B Tech mechanical engineering? After ime we can take addmision in M Tech in regular? Its very hard to clear all subject?

I have a hobby of making coin rings by tapping a silver coin around its circumference edge with a small hammer while I turn the coin on top of an anvil to flatten the edge until it reaches a desired width and diameter. Then I cut the center out and polish it. I need advice or an idea to make this...