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Registered Member #43257
Joined: Thu Feb 20 2014, 03:53PM
Location:
Posts: 33
can anyone help me make a clock run backwards with the flip of a switch. I have found instructables on how to make it always run backwards. I would like to go forward usually and backwards when i flip a switch.
i have this idea for "Grandfather Jacob's Ladder" in my mind and i am trying to work out some details.
Basically it will be a fancy unclosed jacob's ladder with a clock on top. I would like to be able to flip a switch and turn on the jacobs ladder while at the same time, have the otherwise normal functioning clock turn backwards at an increased pace. Therefore creating a "time machine". I'll make up some crap about 1.21 gigawatts and my friends will think i'm cool hahaha
I am also considering finding a clock that has a chime on the hour, and making that trigger the jacob's ladder instead.
Any help with circuitry or ideas would be awesome, thanks!
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
What sort of clock movement is in there now? Mechanical escapement, AC synchronous motor, or "quartz" based 1 pps stepper motor?
If the clock needs to keep proper time in forward direction, and can run at the same speed backwards, then reversible AC synchronous motors with gearheads (timing motors) would be convenient.
More common reversible AC motors are induction type, and run a little slower than synchronous speed.
If you need forward and reverse speeds to have very different magnitude, not necessarily accurate, then DC motors with gearheads are an option.
Finally, for accurate clock in forward direction and much faster motion in reverse, plain old stepper motors with a microcontroller can serve you. This is probably the most power-hungry solution, but I bet you will have a wall plug connection anyway for the Jacob's Ladder.
Registered Member #43257
Joined: Thu Feb 20 2014, 03:53PM
Location:
Posts: 33
Im looking for an accurate clock in forward and much faster motion in reverse. I believe I may be at the time in my life where I learn about arduino boards.
First however I think I will tinker with some movements and see if I can get a motor to turn the dial on the back used to set the time. This turns the hands much faster and possibly if I just make the motor turn that gear backwards I will get what I want.
The microcontroller still interests me because I am guessing there would be a way to return the clock to the correct time automatically once the "time travel" has completed.
Registered Member #43257
Joined: Thu Feb 20 2014, 03:53PM
Location:
Posts: 33
Can you explain more about said electromagnet? The Jacobs ladder will be powered by a very old 15/30 NST, I suppose with enough diodes it could become DC.
Registered Member #43257
Joined: Thu Feb 20 2014, 03:53PM
Location:
Posts: 33
Oh I see what you mean. I am not trying to get the jacobs ladder to run backwards. Im trying to get the clock to run backwards. Thanks for the cool link tho, im not sure i have read that site yet.
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making a clock run backwards
