[TC13] Micro clock

[Davidz90]

The extension of deadline gave me enough time to tinker with pullback-powered clock.

This is not meant to be a direct competition to the awesome clock by Didumos69, rather just a little exercise in efficiency - there are no hands except a tiny seconds hand, pendulum is very light etc. The current authonomy is 90-100 minutes.

Are 3rd party metal nuts used in pendulum ok for an entry?

 

 

[Lipko]

That looks awesome! To be honest, this beats Didumos' model with a tiny bit for me. So much for aesthetics vs function

[Aventador2004]

Sadly, in the rules it says no 3rd party items, so you need to take out the nut.

Other than that, I love it.

[Void_S]

Well, you may add few tires or a heavy brick (73090b) used in trains or ships. I would be very sad to have this amazing creature disqualified.

Edited January 17, 2018 by Void_S
Added a part num

[Davidz90]

3 hours ago, Lipko said:

That looks awesome! To be honest, this beats Didumos' model with a tiny bit for me. So much for aesthetics vs function

 

2 hours ago, Aventador2004 said:

Sadly, in the rules it says no 3rd party items, so you need to take out the nut.

Other than that, I love it.

 

1 hour ago, Void_S said:

Well, you may add few tires or a heavy brick (73090b) used in trains or ships. I would be very sad to have this amazing creature disqualified.

Thanks! I'll see what I can do to substitute the nuts. Unfortunately, I don't have heavy brick, but the metal parts are not that heavy after all - its just a matter of fitting the weight in the lower part of the pendulum - there is not much space there.

[Didumos69]

Cool! Your escapement is much more efficient than mine! I suppose there won't be much torque left to drive more hands, but this is a piece of art in itself.

How much does the nut weigh? I guess max 10gr.

You could use 6 of these (click to go to Bricklink) inserted in a pair of belt wheels on each end of the pendulum. They weigh 1.82gr each and are available for 15 euro cents on Bricklink in Germany. I have only four of them (EDIT the assembly below weighs 8gr, with 6 metal pins and 12 half bushes it will be 14gr or more):

Edited January 17, 2018 by Didumos69

[AFOLegofan66]

very clever design....well done!!

[Davidz90]

Turns out, small lego tires was all I needed. All thanks to the pendulum suspension - with simple axle this would be totally unworkable.

Additionally, I could increase the gear ratio between pullback motor and clock, potentially pushing the authonomy to 3 hours - but now I have to work out some small reliability problems.

[BrickbyBrickTechnic]

Awesome! Could you make the clock hand bigger or more apparent?

[Davidz90]

36 minutes ago, BrickbyBrickTechnic said:

Awesome! Could you make the clock hand bigger or more apparent?

Probably yes. I'm planning to add minutes hand (hours hand seems a bit pointless with ~3 hour working time) and then I'll see how much spare power I have for bigger hands (we're talking about microwatts here ).

[ludov]

This is awesome, I love it!  3 hours is insane! How accurate is it? How is the pendulum suspended if it's not just a simple axle? I see it now, with those bionicle teeth thingies. 

Edited January 20, 2018 by Ludo Visser

[Davidz90]

14 hours ago, Ludo Visser said:

This is awesome, I love it!  3 hours is insane! How accurate is it? How is the pendulum suspended if it's not just a simple axle? I see it now, with those bionicle teeth thingies. 

Thanks!!

Update: This is my final entry - now with two hands. Due to additional load, I had to revert to smaller gear ratio, with about 100 minutes of running time. 

Accuracy is about 5 seconds per hour.

 

 

[ludov]

I'm not convinced of the clock face, it detracts a bit of the technical awesomeness... But cool entry anyway!

35 minutes ago, Davidz90 said:

This is my final entry 

You might want to put your submission post in the entry topic instead of the information topic