December 8, 2022

Disc-Lamp : Cutting & Production

  1. Laser cut disk

Soo I mapped things out by hand in Inkscape vector drawing tool. This is just what I’m used to using and it has all the fields necessary to map in precise units. And its free.

I just wanted a simpled disk to stick on the LEDs, anything else would be mounted on top or behind. I still wasn’t sure if I needed or wanted something to stray the light a little.

So just from my layout of 3.33cm pitch between LEDs and sin(60) * 3.33 = 2.88 cm pitch between rows.

I decided to cut holes into the disk, to feed the led-strips through to the back, to keep all the mess of wires at the back. So anyway, for the holes I added half the pitch, the point in the middle between two LED’s is where the connector cut points are. Thos halves are here in yellow. To feed the strips through I just left a rectangle slightly wider, in the middle of the half, for space to bend. The final cut schema has 0.1 strokes and no fill so is a little hard to see, but you can find it on the github.

Feeding the strips to the back however made soldering a lot harder since the strips were then upside down… If i had to do it again I would probably leave them on the front, then soldering is easier, optimise the wire length so they are not flying around unnecessarily and everything is just as tidy…

2. Sticking on the LED stripes

If you don’t cut holes however give yourself some kind of other reference. Maybe engrave the LED lines here.
I first tried the tape on the back, that however for me did not stick. I added hot glue later but that for me did also not stick. So try it out once beforehand, then maybe sand off the surface for it to stick better

3. Soldering

This little situation is what I mean…

So for wiring, the Data is green and goes all the way through, standard prototyping wire.

Power I used a thicker wire and for good measures gave 3 seperate power connections. You can see where there is only a green connection, I will connect the output ground and then connect a new input 5V.

And test

What I like in this arrangement is that you get the rows aligning in the diagonal too. (almost)

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