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a thread angle of 30 degrees and a depth set to half the pitch. You can also specify your own trapezoid parameters. For ACME threads see acme_threaded_rod(). d1 Bottom outside diameter of threads. d2 ...

The table is not all wood, of course; metal bushings and pins are used in the scissor mechanism, and the lift drive is a stout Acme-thread screw and nut. We’re impressed by [Marius]’ joinery ...