Search found 7 matches

by poyovimenakafudraga
28 Oct 2020, 22:45
Forum: Workshop
Topic: Sprung washer stack for bolt or screw mod?
Replies: 4
Views: 290

Re: Sprung washer stack for bolt or screw mod?

If I open up an a couple of M's maybe I will try stacks of a few cheap spring washers alternating with flat regular washers and see how it tensions up. Side by side with the standard method it would be interesting to compare. Well, that's the best way to make an improvement. My main concern about b...
by poyovimenakafudraga
28 Oct 2020, 20:56
Forum: Workshop
Topic: Sprung washer stack for bolt or screw mod?
Replies: 4
Views: 290

Re: Sprung washer stack for bolt or screw mod?

I probably won't provide you any useful advice but i'll let myself jump in with some basic consideration from an engineering POV. So, as you said, what we want is "a wider range of screw turns setting within the proper tension range". To achieve that, we would need some kind of constant force spring...
by poyovimenakafudraga
20 Oct 2020, 12:35
Forum: Workshop
Topic: ARM-based IBM Model M USB controller
Replies: 9
Views: 465

Re: ARM-based IBM Model M USB controller

Hey. I'm just gonna throw some photos in. I got the PCBs just a couple of days ago and the only thing left to do is to finally assemble a whole board and test it out. And, as a bonus task, to figure out how to implement a cheaper secondary MCU (the one that handles resetting the STM32) instead of th...
by poyovimenakafudraga
23 Sep 2020, 00:25
Forum: Workshop
Topic: ARM-based IBM Model M USB controller
Replies: 9
Views: 465

Re: ARM-based IBM Model M USB controller

Have you checked JLCPCB.com, individual PCBs with them cost a few cents a piece. They also offer an assembly service which is basically as good as free... Yup, but this board exceeds 100x100mm limit for $2 / 5pcs. And the cheapest shipping option I have is Fedex IP which is $23 if I remember correc...
by poyovimenakafudraga
23 Sep 2020, 00:14
Forum: Workshop
Topic: ARM-based IBM Model M USB controller
Replies: 9
Views: 465

Re: ARM-based IBM Model M USB controller

Well, it's hard for me to estimate because I've used components from variuos sources, which were bought in different amounts, some parts I already had etc. I should make a nice BOM with multiple sources and prices listed. Also the important factor are the outrageous shipping prices to my country (th...
by poyovimenakafudraga
22 Sep 2020, 23:32
Forum: Workshop
Topic: ARM-based IBM Model M USB controller
Replies: 9
Views: 465

Re: ARM-based IBM Model M USB controller

Awesome project indeed! Will the kicad files be available for public? Thanks! Sure, I'll probably just zip them and upload them to github. I honestly don't think I can be bothered setting up git on a Windows machine (I'm doing most of my work on a PC, but I use Linux for git and MCU flashing). Agai...
by poyovimenakafudraga
22 Sep 2020, 22:52
Forum: Workshop
Topic: ARM-based IBM Model M USB controller
Replies: 9
Views: 465

ARM-based IBM Model M USB controller

Hello there. I was looking for a replacement controller for my '91 Model M for quite some time and, after some consideration and experimenting, I ended up doing my own project. I'll keep it short here: it does the job, you can enter or exit bootloader mode with a single button next to the USB connec...

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