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I built it because I could. It is fitted with gliding linear slide carriage bearings, has a counterbalanced offset crank with needle bearings, a jackshaft to drive it from a variable-speed dc motor, and even a variable stroke length (which was tricky). Above all it has something I haven't seen in any of the machines one can buy, a bendable, collapsible coupling that would prevent injury to whomever is on the receiving end of the stroke. Clearly it will never be placed into production as it would cost too much to sell at a typical consumer price level. May all be for nothing because I can't get anyone to let me try it out, and I'm only accepting female applicants from among people I know. It's my machine. Sue me.
This file is a 30-second-plus repeat of "v1-reciprocating machine.wav." Downloading that file and using the repeat feature in Audacity will generate any length file you please.
Type
Wave (.wav)
Duration
0:31.282
File size
11.5 MB
Sample rate
96000.0 Hz
Bit depth
32 bit
Channels
Mono