Horologist

Presumably its wheels would turn in place until they were facing back out of the corridor and the car would drive out.

Similar concept to this: http://www.isogawastudio.co.jp/legostudio/modelgallery_model/b064.html Instead of using a differential to sense torque, that design has the drive wheels pivoting freely with the drive axle passing through the pivot. Thusly, the motor can either drive the wheels or turn the entire wheel casing, depending on which has the least resistance. Granted, your design is more stable while moving in a straight line.

Theoretically, a 4 tooth gear would be the natural continuation of the double bevel gears, but a cross axle's 'teeth' don't have the right shape to mesh with other gears.

All spur and double-bevel gears have the same tooth profile and can be meshed with each other. The only difference between the two (aside from the double-bevel gears' ability to mesh with each other at right angles) is in the number of teeth. The spur gears all have numbers of teeth that are multiples of 8 (8 tooth, 16 tooth, 24 tooth, etc.) and the double bevel gears have numbers of teeth that are multiples of 8 plus 4 (12 tooth, 20 tooth, 28 tooth, etc.). Together, they have all of the multiples of 4 from 8 to 40 except for 32. There are two worm gears, 32905 and 27938, which both have one tooth. However, the 32905 has a diameter of 1 (the same as an 8 tooth gear) while the 27938 has a diameter of 1.5 (the same as the 12 tooth gear). Because of this, 32905 works best with spur gears and 27938 works best with double bevel gears.

Technically, the intermittent motion is generated through the eccentrically driven gear, the linkage is there only to transfer the output of the gear to a stationary point on the structure.

Aside from the 28738 Hub's ability to be controlled by the 28739 remote, there was going to be a new "dumb" hub released in the 42113 set with built-in analog switches, like the PF switches, to control motor outputs, however the set's release was cancelled and the hub hasn't been released in a different set yet.

The formula for calculating the distance between the gear centers would have to be different for meshing a ring gear with a regular gear, as the regular gear is essentially inside the ring gear. If R is the number of teeth on the ring gear and S is the number of teeth on the regular (spur or double bevel) gear, then the inclusive distance between their centers is (R-S)/16 + 1.

You're welcome . I found it while doing research on walking mechanisms.

The Russian mathematician Chebyshev made several linkage mechanisms that achieve something similar: see https://en.tcheb.ru/12 (The whole website is full of interesting mechanisms as well).

Hello, my name is Eric. A couple of years ago I discovered how fun making original creations was, and I've been building ever since . I decided to join Eurobricks as a way to get inspiration and share my ideas.

If you double them up and use odd spacing, then they can work as spur gears too: If the 14-tooth gears' teeth had the same profile as the spur and double-bevel gears, then the gear would have a radius of 0.875 of a stud (7/8). Regarding the example above, the gears are about 3.16 studs apart (3.125 studs would be the optimal distance).

@BusterHaus Instead of using (Driver gear's teeth + Follower gear's teeth)/8 - 1 as your formula, use (Driver gear's teeth + Follower gear's teeth)/16 + 1