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geekhack Projects => Making Stuff Together! => Topic started by: mythosmann on Sun, 27 January 2019, 20:54:45

Title: TG4x, a cheap, open source 40%
Post by: mythosmann on Sun, 27 January 2019, 20:54:45

Not doing a group buy.
This is an open source 40% keyboard that uses a tg3 as the base.
Imgur Gallery (https://imgur.com/gallery/X0fYj2h)

I made a post about this on Reddit a little while ago, but I've heard that this might be a good place to post as well.  This is a project I've wanted to do for a good while now, but recently I've actually been working on it a lot.  It's an open source, basic 40% keyboard using the TG3 as a base.  My goal for this was to make a programmable keyboard at the lowest price possible.  If you're interested, you can check out more on the project's GitHub (https://github.com/MythosMann/tg4x).  Any thoughts, comments, etc are very welcome.

Title: Re: TG4x, a cheap, open source 40%
Post by: mythosmann on Wed, 06 February 2019, 23:21:28

I got some pcbs, and have a prototype.
https://imgur.com/a/X0fYj2h (https://imgur.com/a/X0fYj2h)

Title: Re: TG4x, a cheap, open source 40%
Post by: tex_live_utility on Thu, 07 February 2019, 19:17:44

Fun idea. Not sure I really want to keep using those weird uniform R1 keycaps... I guess it's better than dumping em in the trash  :thumb:

Title: Re: TG4x, a cheap, open source 40%
Post by: blawb on Sat, 23 February 2019, 19:16:57

Looks great! What did you do to keep the costs low compared to other boards of similar size?

Title: Re: TG4x, a cheap, open source 40%
Post by: mythosmann on Thu, 28 February 2019, 11:05:15

The main thing is using parts from the TG3, like switches, keycaps, and the plates.  Other than that, using pro micros instead of onboard, and finding a cheap PCB fab.
Sorry about the delay, I'm new to geekhack, and I figured I'd get email notifications.

Title: Re: TG4x, a cheap, open source 40%
Post by: blawb on Tue, 05 March 2019, 23:26:29

Do you happen to have any pictures of the internals for the TG3? I did check your r/mk post and your github page so sorry if I missed some that you already posted.


What's your method for desoldering all your switches? And what are you using to cut the plates to size?

Title: Re: TG4x, a cheap, open source 40%
Post by: mythosmann on Wed, 06 March 2019, 00:02:36

Here's a picture of the tg3's pcb. (https://imgur.com/KSv2rgn)  This one is actually the backlit version, so it has all the leds.
I've been using a desoldering iron like this one (http://www.ebay.com/itm/282282083629).
For the plates, I've been using an angle grinder, dremel, and a file.  I'm trying different ways to make the process cleaner and more consistent.

Title: Re: TG4x, a cheap, open source 40%
Post by: blawb on Thu, 07 March 2019, 16:22:04

I've desoldered some boards with something similar... It was a pain in the ass.

 I imagine a saw would be mine orders of magnitude easier/faster, and you'd probably just have to clean up the cuts with sandpaper/file. If you end up doing a bunch, it might be worth it to take it to a machine shop and have them waterjet cut it. Since it's only a single rectangle, it might not be too expensive.