[007] Lego Technic - Clock #03 Pin wheel Escapement
13,464
Published 2013-03-03
a) structure: parallel technic bricks
b) power source: a non-lego plastic strip as mainspring
b.1) winding: freewheel, 24 teeth gear with worm gear as ratchet
c) wheel train: 8/40=1:5, 8/40=1:5
total=1:25
d) dial: not available
e) escapement: pin wheel, recoil, uni-directional
e.1) escape wheel: single, 12 teeth, drop=30°
e.2) anchor: pin wheel type
e.3) pallets: pin wheel type
f) oscillator: pendulum with knife-edge suspension and crutch & fork
special thanks for youtube users ben van de waal and KEvronista for inspiring this work
All Comments (8)
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This really is a very good design! I can understand why you need a fork: the knife-edge support would be upset by the impulsing, and the escapement's motion is far from periodic, because reversing of swinging direction is caused by a hard collision. The use of a winding spring (in Lego clocks) is new, as far as I know. The disadvantage is that you can not fine tune the force, so as to prevent the collisions. Thanks for letting me know. Best wishes, Ben
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love it! 👍 I used the same escapement system
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Great idea, using plastic for the spring. Makes it a lot more accessible for makers, as well as much safer! Years ago, I had dismantled a hoover to clean it, and the spring for winding the cable back in was exposed. I happened to drop a heavy metal tool on this (wearing PPE), and the whole assembly leapt into the air as it released the energy! Sharp edges on those springs, too; one of the many reasons I was using safety gear. It was quite tricky untangling that mess, not least as I could only touch it with pipe wrenches, as even using pliers would've been too dangerous!
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Like a pocket watch almost
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well, after the experts have spoken I consider this mission accomplished =) my objective was not to make a functional clock but show some designs that could be improved by others. I choose the pinwheel because it has been said to be a desing with high tolerances in construction. The hard collisions are a real problem as I tried to elongate the pallets to reduce the angle of the pendulum at the cost of having some 'fluttering' at the ends of it.
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Very good!
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Another cool thing, is your use of a rubber connector part, as the spring in the rachet. I've seen these used in Lego sprang clutches, although not in the same way.
