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

Bicycle digital spoke tension meter based on Jobst Brandt design

by cmh Nov 16, 2018
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Your Amazon list link doesn't appear to be working for me.

Hah, I probably shouldn't have created it as "private", huh? I think it's fixed, so hopefully it'll work now.

This looks really nice, I plan on printing one in the next day or two. I have parts on the way to build a calibration Jig, I plan on comparing yours with @Modellaner's as well as my DT Swiss clone.

Cool, looking forward to seeing how things go for you! I really need to get my calibration jig assembled.

I have a question, I have a bag full of heat set M3 inserts that I might use instead of printed threads, do you see any issues with a change like that? I am just not enamored with printed threads.

Personally, no, that'd be fine, but why don't you like printed threads? It does get a little limiting in that you have to design the part so the threads are perpendicular to the layers - otherwise they won't work. Other than that, though, I've done a bunch of parts with printed threads and have gotten excellent results. Even with such a fine 0.5mm thread on these M3 screws, the printed threads work well, and I'm able to get the screws as tight as necessary without issues. This is part of why I use the 16mm long screws - plenty of threads engaged in the printed part to spread the load and avoid issues.

It's because I am lazy, and I want stuff printed fast, so I have big layers (0.28 mm is my go to layer height, before you ask, it is on a full step boundary, not microsteps) and I use a 0.60 mm nozzle for almost all my prints.

Ah, yeah, gotcha. FWIW, even at 0.15mm these threads were usable. An early prototype was 0.2mm and was a tight fit (like a nyloc nut) but it worked. At 0.28mm it might still work - nozzle diameter shouldn't change too much if the slicer is getting the ID of the threads right.

Heck, before I was using Fusion 360 I was doing "printed threads" by getting the diameter of a smooth cylinder right so that it was just an interference fit as I turned in the screw. I've also used that approach for parts with threads that weren't perpendicular to the layers, forgo the literal threads and get the diameter of the hole right.

I haven't really looked at the online options available with the Fusion 360 link - but if you use Fusion 360 I'm guessing you could probably make your own copy and then add the provision for those inserts. It'd be easy enough to modify the threaded hole features to just be smooth 3.5mm holes, and then add whatever clearance the inserts needed.

Yeah! nice to see this "low cost" version. I downloaded it and will print it as soon as possible. Very excited to try it :D Thanks!

So this appears to be the gauge used in the Wheel Fanatyk tension meter: http://a.co/d/j2NVe0t - and I noticed the face rotates. One issue I quickly found with the digital gauge I'm using is I can't reach the zero button with the thumb of my hand that is holding the tool, so it's a two-handed effort. That gauge is over 2x the cost of the one I'm using... but maybe might be good for a "premium" version of the tension meter?

As it stands, I'm looking at about $40 USD for the parts, so pretty happy with that. Looking forward to how it works for you! By the way, you can use 12 or 16mm M3 screws, I've got both and don't see any difference. I specified 16mm because a little bit more engagement in printed threads seemed like a good iead.