Alternating traverse of upper shaft and its drum, produced by pin…
Alternating traverse of upper shaft and its drum, produced by pin on the end of the shaft working in oblique groove in the lower cylinder.
Only the input is driven; every other part of this model moves by physics (MuJoCo), and its ratios are measured. Run it live, change its parameters, or switch the friction off to see the output stop.
- Modelled as
- The lower cylinder, 10 cm across, is driven at 30 rev/min, the only driven part. Round it runs a groove 9 mm wide between two raised ridges, lying in a plane aslant the axis, so that it wanders 3 cm each way along the cylinder in a turn. The upper shaft, with its drum, lies 9 cm above, free to slide in its bearings; a pin hangs from a collar on it into the groove at the top of the cylinder.
- Measured
- The shaft and drum travel 6.3 cm to and fro, once in each turn of the cylinder (-6.15 to +0.15 cm, the extra being the pin's play in the groove). Their speed against the cylinder's turning runs from -0.030 to +0.030 m per radian, the throw of the groove, and the mean over the run is near nothing (0.001), as a to-and-fro should be. Contact penetration stays under 0.01 mm.
- Notes
- Brown gives no sizes. His upper shaft also turns its drum; here the shaft only slides, as nothing in the sentence turns it. The groove is drawn as the two ridges that make its sides.
Film (MP4) · Still (PNG) · Spec (YAML) · Model (MJCF)
