LEGO clock escapement L9686

ben van de waal
ben van de waal
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Published 2015-11-25
Clock escapement from LEGO click-clock in LEGO set 9686 according to building instructions:

education.lego.com/en/lesi/support/product-support…

9686-click-clock-c8d4b485ce4cca6f7d1518c76ae99592.pdf

Remarks and Suggestions

00:00 LEGO click-clock escapement. I made a more stable support to facilitate experimentation and to change the anchor more easily. I did not have special beams 4175442, so I used 6535 and 41677 instead. Pendulum length ca 85 cm. This setup is ideal for further experimentation, and to get more insight in the working of a very simple (4-teeth) recoil escapement. Here the angle A between the entry-pallet (right) and the exit-pallet (left) is 45 deg.; the anchor is symmetric.

00:30 Asymmetric anchor. A=90 deg. The pallets can be shifted along the anchor arms to find the best arrangement. The entry pallet can be shifted up and down.

00:52 Asymmetric anchor. A=135 deg. The teeth (spokes) hit the pallet faces at approximately the same angle (ideally 45 deg.).

01:22 Asymmetric anchor. Pallets: 32192. A=135 deg. Because the central connector has a central pinhole (rather than an axle hole) axle 3 with stud 6587 must be used (This allows the anchor to be oriented with respect to the pendulum.

01:53 Symmetric anchor (32015). Works as a dead beat escapement (no recoil). Both pallets are hit successively by the same tooth. The short anchor arms cause a large swing amplitude, which does not allow a long pendulum: short swing time.

Some general remarks:
The anchor is not symmetric in a recoil escapement; the arms differ in length by half the teeth spacing or pitch (here, pitch is circumference of scapewheel divided by 4); the natural (free) swing of the pendulum is disturbed as little as possible; specifically, it must not be prevented from reaching its natural turning points. Impulstransfer from a scapewheel spoke to the anchor is only possible when they are in contact and move simultaneously; for example, if only the anchor moves the scapewheel is locked, and no impulstransfer takes place. The sound (tic.toc.tic.toc rather than tic.TOC . . .tic.TOC . . .) is indicative of proper funcioning. A loud sound is inherent from the small number of teeth: the scapewheel has enough freedom to be able to build up considerable rotational energy before it hits the next pallet.
All Comments (13)
  • @AmiVarsano
    Ben, it's a pleasure to read your step-by-step insightful analysis of this escapement. Ami
  • @user-kv6cj2xq1s
    It really helped me out to make a tourbillon :> Thanks for a such a good video :D
  • @KEvronista
    nice to see you're active again, ben. cheers. KEvron
  • @ZiggEnt86
    Could you do a video of you assembling (or dis-assembling) one of your devices so we can get a really good look at what is going on, please? That'd be super cool! Your videos and designs are always so captivating... I want to know more, hehehe.
  • @tylerbernotas9458
    How much weight is on the pendulum? How much is the weight on the string? Nice video and thank you.
  • @thijsrikkerink6333
    Ik ben nieuw in deze hobby en ik heb al een klok gemaakt. Alleen het echappement is heel inefficient en heeft veel kracht nodig om te lopen. Is er een andere simpele die ik kan gebruiken voor mijn klok? Groeten van een mede Nederlander ;)
  • @xxtedgegimmerxx
    Plz I beg you awnser me back plz plz make a tutorial plz I've been spending over 5 hours looking for a tutorial I tried the link but it dident work plz😭😭😭😭