Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

Guitar Chord Machine (Chordoma)

by AndyDove21 Apr 1, 2019
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A thing of the week!

Took a little while but here is a video of Chordoma working: https://youtu.be/AU-Oaop_8AA Thanks to my son for video'ing it!

The thing I never really worked out a solution for, was a way of load balancing between the three strings that each chord has. If there was just two strings then I could have used a pulley on the key, with the chord wrapping around it so that pulling the axis of the pulley would allow the string pull force to balance. But you can only rotate a wheel in two directions - cw and acw - which is no good for three strings. Putting this design in the public domain in the hope that somebody somewhere can think of a solution for that. Share your ideas!!

Great idea, this looks very interesting - does it work on a normal 6-string guitar?
But it looks also a bit complex to build without an instruction. Please upload a video on Youtube.

There are instructions on a PDF in the download, otherwise, yes it would be hard to make. Still hard though... As you'll see from the video I was using this on a Ruison TR-3 Silent Guitar connected to a small amp. This is a slightly odd guitar in that there is no classic headstock, but fitting it to a normal classical guitar would just be a matter of changing the rear clips. If you got a cheap 'sacrificial' guitar then you could glue the clips to the back of the neck. I've not done that.

Wow. big respect. I'm looking for something like this. I have looked at your construction and have some ideas! A video would be very helpful here! please upload. Thanks.

Video freshly uploaded, I hope it's useful.

Looking to print this, as a start for a steampunked automatic banjo (trying to design my own strumming/picking device atm).Working video would be appreciated, to see what can be expected or maybe needs tweaking for my implementation..

heh, yes it's real. Just happen-chance that it is was uploaded April 1st. I'm away from home this week, off to a conference in Vegas (tough gig...) but I must put it back on the neck of my guitar and video it when I get back. But please take my word for it, it's an actual thing. Would have been a heck of an effort for an April 1st prank!

I wonder why it was uploaded on the 1st of April? Can we see a video of it being used on an actual guitar?......…..

I'd like to put this on a robot arm. I actually was working on my own design that works remarkably like this one.

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This is a really cool idea! If somebody wanted to build a guitar playing robot this would be a nice place to start!