After seeing this video, I bought a flap disc and THEY ARE AMAZING!
It is used in an angle grinder, and they are layers of sandpaper. They grind and remove metal very well!
I now use my flap disc for most grinding! I only use the old hard wheels to cut.
You can find it on Amazon
A quick video showing what happens inside an oil pump.
Oil pump is from a USDM Acura Integra B18A1 Engine.
Moving the Endeavor Spacecraft to California Science Center
Filmed on 10-14-2012
Here is a good video I found on welding with flux-core!
How car pistons move in a 4 cylinder engine.
Just a simple video showing the movement of the pistons.
Engine is a Japanese Honda B16, Y21 Transmission with a LS 5th gear.