ps. I'm hijacking this pinned comment now. I forgot to mention that the length of the fiber also is a factor for its frequency. The length I used in the rig is similar to the length in the profile, so therefore the direct comparison. I found an interesting article that is quite easy to understand explaining this ffden-2.phys.uaf.edu/webproj/212_spring_2014/Claressa_Ullmayer/Mersenne%27s%20Laws.html So yes, if the profile becomes shorter we have to tune it at a higher pitch to get the same tension.

Fantastic project, with the print files are the list of items you use present? ( and maybe links so i can buy it directly? )

@@andreasponchiado8839 Thanks! You can find that in the "Parts needed" tab on the page of that product!

i want you to understand that this is getting scaled up to mech suit

Needs a steel cable for the heavier load of the microphone. Or perhaps an end joint part that the beam section fits deeper into. CA glue all the pieces after tensioning.

Fairly common, you can measure linear density of a string and calculate tension basing on frequency and length of the string, it's in many design manuals too

Motorcycle drive belt manufacturer has an app for tensioning belt using that concept, pretty neat

Resonant frequency is a function of tension, length, and mass of string. This is probably a pretty accurate technique if the lengths of the string are the same and the string is the same.

This is how voron does their belt tension

The mechanical engineer in me is wondering how the resonance frequency changes between the test rig and the 3d printed part would affect the results.

That's true! A guitar is a nice example and therefore I made sure that the length of my rig was the same as the one I used in the design. In hindsight I should've mentioned that.

@@properprinting I mention it because I assume in the future you’ll have variable length spans. You should theoretically be able to use the measurement you already made to calculate the expected frequency at different tensions and lengths.

True!

Good thing to look at nature more often, thanks for this info!

Geez thanks, now I just had to watch a video on how the elbow work. (kzfaq.info/get/bejne/adJjYJh6z5muimw.html) But i really don’t get how the olecranon helps as a lever arm? It seems that its just a ”claw” around the humerus joint, the biceps attaches below it (just like the springs in his desk lamp), and the triceps attaches at the back of the claw. Or am i thinking backwards? Should his springs be concidered the triceps?

@@lillalysmasken3 The springs are like triceps: they have to apply force around the outside of the joint (more than 180 degrees). The olecranon improves this (I think?) by 2 means: first, extending the path taken by the tricep, so there is a bigger difference between the length when flexed and the length when relaxed; second, providing a lever arm that is closer to perpendicular to the muscle's force, allowing it to generate more torque around the joint. I may not be explaining super well. But if you look at the counter spring in this video, you can see that it doesn't stretch very much as the arm flexes, and as the arm flexes more and more you'll see that the spring is pulling "back" against the arm, not *around* the joint.

Why not replace the spring with more Kevlar? You can put some knobs near the joints so you can hand change the length of the Kevlar to get different angles.

what type of lamps? Do you have a website?

Thanks! Now I'm fulltime, the plan is to post more often! Some upcoming projects are also bigger though ;)

@@properprinting Great! I'm currently in the middle of my own big project, making a giant 3D printer of my own, I just hope my infinity cube style enclosure works out like yours did, it looks so awesome :)

@@jakobwowy3876 Mostly gimmick type lamps, such as a robot/ufo/gramophone shaped lamps. Stuff like that. I make them for local gift shops, and they always tend to clean me out, so I never got to making much on a online presence for myself (very unprofessional, I know :( ). Best I have is inst, where I keep telling myself I'll post more, but never get to it - domodel.cro

@@astrumrocket6556 That's awesome, good luck with the project!

Thanks! I'm doing my part xD

Thanks man!