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numechron digital clock

by:QY Precision      2019-10-04
My Numechron digital clock design is inspired by the Pennwood model 1364 digital clock.
This type of clock originated in the 1930 s and was built by Pennwood and Lawson for many years in many different wood, metal and plastic shell styles.
Although my clock is much larger than the prototype, I really like the Art Deco style of the 1364 case and choose to imitate it.
While imitating the original style, I used quite a lot of open space in the case design so that the interior of the clock can be seen.
An employee of pemwood
Greenewalt was patented for this type of clock in 1935.
He developed a clever set of wheels, cams and levers to flip the numbers and operate the clock.
In order to design the mechanism of this clock, I checked the original patent.
Here is the video of the clock: Numechron digital clock below is the video describing the design and construction: Making the NumechronTools material from the original patent, we can see the clock parts that we need to build and how they fit together.
I make all the parts using Carvewright CNC and design the parts using Carvewright Designer software.
I did cut some prototype parts and made an attempt on the temporary fixture and then made a design adjustment to make sure the mechanism works properly and validate the design. (
Carvewright uses proprietary file formats, not standard STL or DXF formats, so these files cannot be used with other CNC machines.
I do plan to provide these files in the Carvewright schema warehouse in the future. )
You can also make these parts with a reel saw (
Need to draw numbers on it instead of engraving numbers).
Need to make some minor changes to the section shown in my build.
Templates are provided in all major sections except the case section.
Starting with hours, minutes and minutes of wheels, these are made with 1/4 of Baltic birch trees.
Baltic birch plywood is a quality material with many thin layers that are usually void-free.
All my materials are from a local family center.
To make these parts without Carvewright CNC, use the complete
The size template is attached below.
Print PDF files on 8.
5 \"x 11\" sheets and check to make sure the print output is scaled correctly.
Fix the template on the plywood and cut it out with a reel saw. Sand.
I used 1/4 of poplar trees in hours and minutes numbers.
The template contains the size table of these parts.
Please note that the top and bottom edges of each number must be reclined-
Cut at a certain angle
As specified by the chart.
Using the profile template provided, the number of seconds can be cut on the band saw.
Cut the frame part and the motor installation part from the 3/4 \"hardwood floor.
Once the parts of the wheels are all cut off, assemble the numbers to the wheels at once.
Trim digital pieces according to the needs of tight fit-
I used a desktop disc sander, and the table at the oblique cutting edge of each digit was set at the appropriate angle.
Glue and clamp.
Note that the wheels for a few minutes, minutes and seconds all have a hook on the left side of the wheel. (
To the left when facing the front of the number. )
For this I used a small piece of 1/8 brass tube from Ave hardware.
Because the second wheel is moving continuously, unlike other wheels, the second wheel is best made into a cylinder.
I made it in six parts.
You can make such a part with a band saw, or turn a complete cylinder on the lathe.
The digital wheel is supported on a frame consisting of several pieces screwed together.
I used 3/4 Oak on my frame pieces.
The shaft uses 7/32 \"brass pipe, 1/4\" brass pipe for the casing.
The larger tube slides on the smaller tube, making the friction of the wheel small when turning.
I got my pipeline at the local Ace hardware company.
The wheels are between the two arms for ten minutes.
For a few minutes, the wheel rides on the shaft that stretches out from the right arm.
The hourly wheel is traveling on the shaft extended from the left arm. Spring-
The loaded arm rides the cam on the wheels of each hour, a few very minutes, and minutes to keep it in place after the numbers move.
I processed the arms and brackets in oak.
Xiaoquan comes to the local trump card hardware store.
The arm is adjustable for tension and position.
Excessive tension will cause the motor to tighten;
To little causes the numbers To not align when they are still.
The position adjustment allows the wheel to rotate slightly so that the face of the visible number is aligned.
To set the time, just go to the back of the clock and rotate the wheel manually.
The clock is driven by a 1 RPM synchronous motor.
These can be obtained from the clock parts supplier.
Use a separate motor bracket to keep the motor and the second drum in place.
The wire runs through the base to the lower side of the clock base and is hidden.
A cover blocks the motor.
These motors run very hot, so ventilation slots are needed.
The parts are all processed in 3/4 oak and glued together and screwed together.
A box and panel end the clock.
A wide range of case styles can be used.
I imitated a classic case, but built a case with the top and side of the rib so that the mechanism of the clock can be seen.
A wide variety of stains and finishes can also be used.
I use clear satin polyurethane with clear wax wood stains and clear wax.
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