I feel like these last two would be "simple" enough to try out LDCad's new interactive animation feature—for those clever enough to do so. 
(By the way, why does the first crank machine have a transparent 1x2 brick? Is that in the file itself, or just the preview image?)
(By the way, why does the first crank machine have a transparent 1x2 brick? Is that in the file itself, or just the preview image?)