this Mexican-made hand truck shows some smart engineering. instead of grinding down 3/4 inch round steel stock to make an axle, as I did, they used 5/8" square stock. much less milling to do to reach the 17mm diameter of the most common bearings you find down here. then they turn the ends down to 1/2" and cut threads to hold the wheel on with a 1/2" nut and lockwasher.

I got better measurements to drill the holes in the next pulley: 69mm through the axle, and about 48.6mm point to point along the square. but the sun angle was already too low by the time I got around to it, so I'll have to drill it tomorrow.

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last updated 2017-01-05 20:44:48. served from tektonic.jcomeau.com