The „8“ Clock - 3D Printed

The "8" clock is about to show 11:45 a.m. ... sounds kind of strange. A great way to introduce children and pupils to mathematics.

The "8" clock, whose times are only displayed using the number 8. This requires mathematical calculations. These are simple arithmetic representations that are primarily intended for school-age children.

The idea to implement it for 3D printing came to me from a picture of an alarm clock with just such a clock face that I saw on Facebook.

To make the calculations reasonably compact, they are shown as a fraction.

The clock has a stand, but can also be hung on the wall.

Dimensions: Ø 20 cm

For this project you will need:

a 3-D printer and at least 2 different filament colors and

1. 8_clock.stl (or 8_clock_borderframe.stl)
2. 8_clock_stand.stl
3. 8-clock_clockhands.stl
4. a clockwork
5. clock hands
6. spanner (10mm).
7. AA 1,5V batterie

Clockwork and clock hands can be found on the internet. I have attached a clock hand file. However, a second hand is missing.

You will find many pointer variants on the Internet. Here, for example

Fousenuk 3 Uhrwerk für Wanduhr, Uhrwerke zum Selbsteinbau mit Zeiger, mit 7 Uhrzeiger Sets, Quarz Uhrenwerk Lautlos, Uhr Ersatzteile, Clock Mechanismus zum basteln, 13/16/22mm, für Uhren-Bausatz

Print Settings:

1. Printer brands: Bambu Lab
2. Printer: X1-Carbon
3. Supports: No
4. Resolution: 0,2
5. Infill: 10%
6. Filament brand: Bambu
7. Filament color: Basic Red, Basic White
8. Filament material: PLA

The printer and the user should be able to perform a color change. The printing itself is actually unproblematic.

Single-color printing is of course also an option, but this makes it more difficult to read the time tasks

Remark: As all parts are designed to fit very precisely, it may happen that you have to rework one or the other part a bit with sandpaper and/or cutter due to different dimensional accuracy of the printers and the different behavior of the filaments.

Proceed as follows:

1. insert the "hook"
2. put the plastic washer on it (it should prevent the clockwork from rotating)
3. insert the thread of the movement through the hole in the case from behind
4. insert the included washer and screw the nut onto the thread.
5. tighten the nut with a spanner (10mm). Align the movement at the same time!
6. insert the hour hand
7. then the minute hand
8. and finally the second hand

Insert a battery (AA 1.5V) and align the movement if necessary.

Let the hands turn and check that they pass each other at the right height.

If they touch, you have to "bend" them carefully into the right position.

You can find pictures of the clockwork assembly here:

https://www.instructables.com/Clock-X-3D-Printed/

With the help of a small stand, it can be used as a stand clock.

The stand has a slot into which the clock face can be inserted. Gluing is not necessary.

In this stand, the dial is slightly inclined backwards at 98°.

To set the clock, it is best to set the hands to point six o'clock so that both hands form a straight line. Then set the exact time by moving the minute hand only. The hour hand moves automatically.

Done!

Now you just have to find a suitable place to put the clock or hang it on the wall ...... and check whether the calculation of the time is correct!