Lego Clock Escapement W10

[BenVanDeWaal]

See video W10b. A thread is wound around a pulley on the axis of the left wheel.

[jerzeygrl08]

How does the weight system work?

[BenVanDeWaal]

It is not calibrated.

[MegaRAMHarddisk]

now i cant stop going tic tock tic tock tic tock :D

[kickass423]

it is boring !

[legoman909]

tic tac tic tac tic tac :D

[KEvronius]

....(oops! i meant " rations and arbor friction"), air drag and the pendulum axle friction, with just enough left over to propel the pendulum beyond its natural swing. thus, heavy bobs; aside from defining both centers of gravity and oscillation, and thereby the "length" of the pend., a heavier bob has a longer swing duration, thus it swings further than a lighter one. sadly, my clumsy escapements depend on a lot of weight. gonna have to rethink my "smaller is better" philosophy.

KEvron

[KEvronius]

"The pendulum stops the escapement wheel, rather than the wheel stops the pendulum."

ah, but this brings up a critical point which i've only recently come to fully appreciate: in a properly weighted deadbeat escapement, the pendulum swing ends just before the anchor pallets make contact with the minor diameter of the wheel. ideally, the device is driven with just enough weight to overcome the torque of the drive train (ratios and pinion friction), pallet/wheel friction and pen. arbor friction

[BenVanDeWaal]

Exactly.

[docmarionum1]

How long can this keep going? And with how much weight is driving it? Building someone similar I couldn't get more than, maybe, 30 seconds.

[BenVanDeWaal]

Only a few minutes. It only demonstrates the working of an escapement, not of a complete clock. For a long-running clock you have to build a geartrain that drives the escapement. Of course, the runtime depends on the length of the pendulum (see W10b).

[docmarionum1]

Thanks for the response. I realized that it was running out of power so quickly because the gears were a bit loose, so it wasn't transferring enough energy back into the pendulum.

[adyrulesthe666]

@docmarionum1 it depends on the gear train surely?

[drybones234]

is this for a grandfather clock

[BenVanDeWaal]

A grandfather clock works with a single escapewheel, rather than two.

For a 24h grandfather clock 4 pendulum swings per wheel rotation is not enough. The maximum that can be obtained with a Lego model is 12 (as far as I know), so W12 is the best option.

[BenVanDeWaal]

There is just a pulley on the left axle, with the thread wound around it. No other gears.

[gammat1]

That is awesome but what is behind the two gears. Did you just built it as it is from the front or did you add some other gears?