Persian drill
Persian drill. The stock of the drill has a very quick thread cut upon it and revolves freely, supported by the head at the top, which rests against the body. The button or nut shown on the middle of the screw is held firm in the hand, and pulled quickly up and down the stock, thus causing it to revolve to the right and left alternately.
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
- An upright stock with a quick right-hand thread (pitch 4 cm) turns freely under the arm of the body. A button holding a half-nut of the same thread is pulled up and down by the hand (3 cm each way, the one driven joint); the flanks turn the stock to the right and left alternately.
- Measured
- Stock turns 157 rad per metre of button travel (one turn per 4 cm; slope -156.8/-156.9 vs -157.08, r2 1.0000); penetration 0.12 mm.
- Notes
- The hand is a velocity-driven slide swinging +-3 cm at 0.5 Hz; the stock has only its own thread to turn it.
Film (MP4) · GIF · Still (PNG) · Spec (YAML) · Model (MJCF)
