Laser cut carboard planetary gear

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Build Info:

Gears made using the gear extension in inkscape. The inside gear or ring gear was also made with this extension but I inverted it. I’ll be making a video tutorial on how to do this in the near future. The ring gear has 42 teeth, the 3 ‘planet’ gears have 12 teeth and the central ‘sun’ gear has 18 teeth. This website has lots of useful info on the mechanics and calculations involved in making a planetary gear. The main points to note are:

To get the gears to mesh properly, all teeth have the same pitch/spacing. Also use this equation to calculate the number of teeth required per gear so everything fits correctly:
R = 2 × P + S

R Number of teeth in ring gear
S Number of teeth in sun (middle) gear
P Number of teeth in planet gears

Finally, if you want the 3 ‘planet’ gears to sit at 120 degrees from each other, then both your sun gear and ring gear need to be evenly divisible by the number of planets. Follow these constraints and you are golden!

Design info:

Click here to download SVG file of planetary gear

All line widths in the svg file are set to 0.01mm. Depending on your vector graphics editor the svg file may appear blank when you first open it. You will need to switch to outline mode to see anything. In Inkscape this is done by clicking View > Display Mode > Outline.

Here is a png image of what the svg file drawings look like:
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(Edit)- made another vid just showing the gears rotating…..so…..hypnotic…cant….stop……watching

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k40 40w chinese laser cutter review – VIDEO

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k40 laser cutter : dial for laser power knob

The power adjust knob on this k40 laser cutter didn’t have a dial of any sort so it was hard to set power values for different materials like cardboard and acrylic.

Here is a picture of the dial:

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To cut it out you could laser cut and etch it or print it out on paper and cut it out with a blade. The svg file linked below has the correct dimensions for the dial so it should print the correct size.

https://drive.google.com/file/d/0B5yKKaW8az34S2FvdjJleHlCQ1U/view?usp=sharing

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Laser cut wall lamp with ws2812b and arduino nano

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5.6mm plywood cut using a 40w laser cutter. The ws2812b led strip is hooked up an an arduino nano using the neopixel library from adafruit : https://github.com/adafruit/Adafruit_NeoPixel . The program running in the video is one of the example sketches that comes with the library. I tried etching the front of the lamp and it turned out okay but could have been better. The laser beam current was too high and it burned through the first layer of plywood. This made it look like burnt sandpaper so I painted over it with red paint.

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