Picture of what's in a quartz clock
having come across instructables on equatorial mounts I wondered why no one used a quartz movement as the power source I quickly realised it is because they produce very low torque. I wondered if there was anything thing that you could do to improve it so as a starting point I took one apart to see.
Remove these adsRemove these ads by Signing Up

Step 1: Open it up

Picture of open it up
thankfully the designer decided a couple of moulded in clips would save messing around with glue, so it's a simple case of popping them undone and gently easing the case appart. I used a small screwdriver but I could probably of managed just with finger nails.

Step 2: I didn't want to do that

Picture of I didn't want to do that
I missed a clip in the battery compartment and used a little too much force. Not to worry I've repaired mechanical alarm clocks before this shouldn't be a problem to resemble.

Step 3: The power source

Picture of the power source
the reason a quartz movement doesn't produce much torque is that basically what you have is a small 2 pole brushless motor kicked around one pole at a time by a pulse to the windings from an encapsulated chip and a quartz crystal.

Step 4: Lets put it back together

Picture of lets put it back together
unlike a traditional mechanical clock where the gear train is mounted between 2 plates. The gear train for this quartz clock are mounted either side of a central plate sandwiched between the two halves of the case. The first thing to reinstall is the minute hand drive. This is driven by a small gear that passes through the mounting plate.

Step 5: The hour hand drive

Picture of the hour hand drive
the hour hand is driven by an intermediate reduction gear and has a hollow shaft that runs on the outside of the minute hand shaft.

Step 6: Refitting the Central plate

Picture of refitting the Central plate
first the electronics need to be reinstalled in the case. The board and field coil locate on 4 pins 2 of the pins also help locate the central plate. Once the central plate is in place the front section of the case has to be supported on a hollow support.

Step 7: Refit the armature

Picture of refit the armature
the armature mounts on a shaft between the two poles of the field coil.

Very interesting! Thanks for sharing!