Lego Clock Escapement W10

Lego Clock Escapement W10: Dead-beat version of W4. The pendulum stops the escapement wheel, rather than the wheel stops the pendulum. Consequently, the pendulum swing amplitude is not limited by the escapement mechanism, but depends only on the impuls transfer (the weight) and the losses. Thus the swing period is not seriously affected by the (variable) interaction with the wheel, making timekeeping more accurate. Also, as compared with W4, there is no visible hysteresis between the wheels.
Part of series W1 thru W17.
See also W10b

Category:

Science & Technology

Tags:

• Lego
• clock
• escapement
• W10
• dead
• beat
• pendulum
• hemmung
• Graham
• Uhr

[BenVanDeWaal]

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

[BenVanDeWaal]

It is not calibrated.

[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).

[jerzeygrl08]

How does the weight system work?

[adyrulesthe666]

@docmarionum1 it depends on the gear train surely?

[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