Coup Perdu Movement

I haven't worn any motors out, but I don't run the clock continuously. Mine has probably seen around a month of active use without wearing out. I paid around US$10 for 5 motors on eBay.

Clayton Boyer uses a much larger motor in his Swingtime clock. The current is also significantly higher. He uses a mercury switch to handle the high current without oxidizing the contacts.

Hi Guys,

I have been running the coup perdu constantly on the wall and I too have been replacing the N20 motors regularly. I think that I agree with Dave that they are just not designed for the duty cycle required to run the clock on the wall indefinitely.

I have purchased the following two drives to test, but my skills in 3D designing are just not there yet to be able to design and print something that could house these drives.

https://au.banggood.com/Machifit-DC-12V-30-800rpm-16GA050-Reduction-Gear-Motor-For-Smart-Door-Locks-Meters-Security-Cameras-p-1721213.html?rmmds=myorder&cur_warehouse=CN&ID=6327013

https://au.banggood.com/DC-3V-6V-Single-Axis-Gear-Reducer-Motor-For-DIY-Smart-Car-Robot-p-1201746.html?rmmds=myorder&cur_warehouse=CN

Krys S

Hi Krys and Steve,

I added a .1uF ceramic cap across the motor terminals. I am hoping this will protect the little armature and brushes. From what I see online, this is std operating procedure for brushed motors.

See picture. Soldering could be neater.

Wish the little motor luck!

Dave

They look like the correct motors

Steve, the two gearmotors links that I sent you, you wrote me that they can be fine, the measurements of the two motors change slightly, are they equally fine to insert it in your container?, I also noticed that between the two models one has the shaft 10 mm long the other 20 mm, which of the two can I buy?. a thousand thanks !!!!

10mm is good. 20mm will work but it will stick through the pinion. It could be cut off if needed.

Hi Krys,

The Coup Perdu clock lifts a 1-2 ounce weight every few minutes. The drive weight sits between the minute hand and the second hand rotating once every 24 minutes. This allows a relatively small weight to be used.

Many of the other rewind mechanisms are designed to lift a large weight much less often. Lifting the weight on the 32 day clock would have to do this. The overall power might be the same, but it would require stronger motors and higher current batteries. The switches would also need to handle the larger currents.

The Coup Perdu uses a small motor with small batteries and a low current reed switch as a trigger.

I am looking into elegant ways to add electric rewind into some of my older clock designs. The beauty of the Coup Perdu clock is that the heavy drive weight can be eliminated. This gets rid of all the gears between the minute hand and the winding drum. The bottom third of the clock can be eliminated. In the 32 day clock, this would eliminate 3 of the gears on the left side of the clock.

I am adding a wall mount option into the Coup Perdu clock. The base will have options that will look better when mounted against the wall. This might be similar to the rewind mechanism in Clayton Boyer's Swingtime clock.

Steve

Hi Steve, This makes great sense. Also, with a self winding system, it should be easy to make a desktop table clock a wall hanging clock.

Really looking forward to this one.:-)

Krys S

Yes, it should be modifiable for wall mounting. I am trying to hide the batteries in the base on the desktop version. A few other changes might be needed.