Final assembly...

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Finally... we can assemble the YamPAD and complete the project.

Here's all the parts:

• PCB + aluminium plate
• Beech wood case
• Keycaps
• Threaded inserts
• M2 screws

Let's start by adding some rubber feets.

Then the threaded inserts. These are actually for plastics but work great for wood too.

And now the easy part: plate, screws and keycaps.

I really like the contrast between the aluminium plate and the brass screws.

You may wonder why all those different switches: I'll use this numpad as a swith tester to convert my collegues at work :D

Did I mention that it works too?

And now I think we can call this project complete.

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Time to sum up the project. What would I do differently?

Design wise:

• I would mount the Arduino on the bottom of the PCB so that I can use the same form factor but have a nicer plate. As you can see I had to cut the plate at the top to makie room for the USB connector and there's a strip of aluminium that's way too thin on the right of the OLED screen. Just by mounting the arduino on the bottom I will fix all those problems.
• I would add the option to have one 2U key on the bottom, so that whoever wants to have it can choose to do so.
• I would add a rotary encoder because... why not?
• Enlarge the holes for the RGB lighting.

Regarding materials:

• I should find a way to protect the aluminium from scratches. During milling and related operations I scratched the surface a few time and it shows.
• I would like to wax the wood and make it look super shiny. I didn't do it this time because I was too afraid to ruin everything with a botched finish.
• I should use a thinner material for the case. Here I used a 19mm thick wood, a more sensible choice would be around 15mm maybe lower. I didn't try to fix it with the CNC because it took me 2hr to make the cut and leveling the surface would skyrocket the machining time.

Maybe I'll fix a few of these problems in the next iteration, but for now I'm happy with the results :D