Knex Clock: Difference between revisions
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The weights will drop down the center, I need to add a guide track. | The weights will drop down the center, I need to add a guide track. | ||
The winding mechanism will of course go through a differential gear. Also need a ratchet for that to work. | |||
== Pendulum == | == Pendulum == | ||
As tall as the clock. The pendulum will actually rock in a cradle rather than spinning on a rod - lower friction. | As tall as the clock. The pendulum will actually rock in a cradle rather than spinning on a rod - lower friction. | ||
Revision as of 17:22, 8 December 2015
https://www.youtube.com/watch?v=zvmOLhV_NYE
Brilliant design for the hand. Over comes the lack of correct gearing.
Differential: https://www.youtube.com/watch?v=rBfQeRWtpxQ
Sizing
The whole thing will be 7' tall.
I'm not sure I want to use corner connectors - I don't think I have enough. Instead, alternate yellows with corner bracing to hold the shape.
Hands
Rather than gears, we'll use rods for transmission. The minute hand will have essentially 2 teeth (two rods at 180°). That goes to a 3:1 reduction, which goes to an 8:1 reduction; for a total of 24. The 3:1 will be a little janky, but feasible.
Winding and Weights
I'd like to do all this with Knex chains rather than string - more authentic; but I'm afraid of how much friction that incurs.
For string, I think I'll use the mason line I have. Fishing line would hold it's shape, causing weird fluctuations in power.
The weights will drop down the center, I need to add a guide track.
The winding mechanism will of course go through a differential gear. Also need a ratchet for that to work.
Pendulum
As tall as the clock. The pendulum will actually rock in a cradle rather than spinning on a rod - lower friction.