Hacked this together last week for Sam’s school fete to try and help persuade donations.
Cheap as chips mini hobby servos, Arduino Nano clone drives them directly with the ‘servo’ library. Powered for the whole afternoon from a LiPo battery bank.
2 layers of 3mm acrylic sandwiching one of 5mm. Pound coins are 3.2mm thick, annoyingly. Moving parts made from 3mm acrylic. Held together with lots of M3 bolts!
Final Cut.dxf (52.9 KB)
Very cool, you should add a reflectance sensor where the coins start to start the sequence.
I thought about that, and also about having individual buttons to control each servo to make it more ‘interactive’ but in the end decided to just leave it running all the time to attract attention.
Was this done with the trotec? If so, ,aybe a bit of a blog would be cool?
It could have been…
This is really cool! I really like it! I want to do something with cogs and moving parts but hand cranked. It is on my project list for next year.
I use this program to generate gears to laser cut
https://woodgears.ca/gear/index.html
But I just found this online generator - doesn’t look as flexible in some ways but it’s free!
Thanks 
