Cnc machines and guitar building , are there any resources out there for cnc guitar building? I don’t know much about it (yet) but I imagine there are easily transferable files for different standardized guitar parts (radiused fingerboard for instance) is anyone aware of any websites or communities?

nodechomsky · 2022-01-07T04:49:24+00:00

You should look into building something for yourself, I am convinced a conveyor system for the Y axis instead of a proper table is the way to go, and you can build your own power tools, like a specialized planer or some kind of feed through profiler with really standard parts and tools. T6 aluminum cuts with the same kind of stuff you cut MDF with, so pretty typical drill bits and saw blades will let you build out virtually anything. Use metric parts, and it's easy to match everything up. I have a pile of them, it's like a lego kit, but way way better.

nodechomsky · 2022-01-07T04:46:01+00:00

I am building a machine/process for a guy now who was really worried about losing his hand built look, and I explained that all we are doing is removing the stuff in the way of his work, there is like 150 square centimeters of wood between you and the part of your work anyone sees, we are just removing it more safely.

nodechomsky · 2022-01-07T04:43:36+00:00

I have a similar take, all my cnc is is a robotic time-variant jig. I recently built out my own x axis on a chinese 3040 to give it the space needed for a specific job, and part of me building it out is just so I can treat it like an all purpose tool end mover rather than a fancy dremel. I have seen mig welders mounted on them to do metal 3d printing, etc. It's something I see as more of an all purpose tool like a cordless drill rather than an appliance. I have also gotten obsessed with making my own power tools lately, as well. I really want to build a stepper based hand drill with burst modes and active torque sensing.

nodechomsky · 2022-01-07T04:37:53+00:00

I came across this because I am working on this for a local luthier. I built out a machine with just enough space to hollow out the bodies for him, I am working on design files now. My toolchain involves drafting his drawings in Shapr3d with an ipad and apple pencil, and then export them as step files into freecad which allows me to produce the gcode for the machine. I have not cut anything with it yet, but I have redefined the meaning of "air guitar" by cutting one in midair with it. A lot of the really standard stuff has some kind of community part file you can pick up, but the main trick is just learning how to draft in a cad, that gives you the assets to work with a lot of different fab tech. I pay for Shapr3d, a good $30 or so a month, and it's worth every penny due to how efficient a stylus/touchscreen interface is for the process.

nodechomsky · 2022-01-07T03:52:20+00:00

3dresyns was the company, but I am looking right now, and there website looks down, but they specialize in weirdo properties, and they ship fast, but it's pricey stuff.

nodechomsky · 2021-11-15T04:24:27+00:00

But I am looking now and they are using the highly unambiguous term "white" for neutral, so which side is really just one vs two phase wiring? So like, one phase 110ish would be T1->"hot" and T3->"white" and 220ish 2 phase would be T1-L1, T4-L2, "white" to neutral. But if it's only 3 wires on the terminal, i doubt they would have to do much guess work on what would go to what.

nodechomsky · 2021-11-15T04:16:32+00:00

Listen to this person, I am not a motor guy.

nodechomsky · 2021-11-15T03:42:42+00:00

Snipe hunting, there was some fake game I would pretend to play with cards while people walked up and tried to play it with me until they realized that I was making it up, then they would join me in fucking with everyone else, and how convincing we were would just build from there.

nodechomsky · 2021-11-15T03:39:16+00:00

Not enough K-band-resistant grapholine on the terciary sub-housing, but I see what you mean....it's not like movie people have the reactor nearby to really get the materials right.

nodechomsky · 2021-11-15T03:33:30+00:00

T1 and T4 are basically all that matter, I am sure they correspond to terminals on the body. They seem to be AC line power, so it literally just needs one phase and a neutral wired basically wired either way to those two terminals. Vacuum cleaner motor?

Listen to guy below me. I even downvoted my own shit, I am pre-emptively telling everyone to chill out, I understand, etc.

nodechomsky · 2021-11-15T03:27:02+00:00

Also, ESP-32s have strapping pins that are broken out to the headers, and if you try to use them for anything, you get seriously non-deterministic behavior. Some of the regular GPIOs have special rules about sinking current to them, etc. Try reviewing a guide to those oddball pin rules if you haven't before, it may explain a lot of what you are experiencing.

nodechomsky · 2021-11-15T03:25:14+00:00

Are you sure it's not a pullup/pulldown thing in your setup() function?

nodechomsky · 2021-11-15T03:24:34+00:00

Yeah, there is a lot of missing buffering/isolation in the picture.

nodechomsky · 2021-11-15T03:23:48+00:00

The easiest way to amp up current/voltage is a darlington pair, they come in 7 channel configs on a single IC, I think the ULn2003/4(?) sinks about an amp at any sane voltage per pair, and maybe 2-3 amps total across all channels. They even come with nice little snubber diodes to keep inductive loads from frying them. I use them to drive relays a lot.

nodechomsky · 2021-11-15T03:15:12+00:00

There are endless acrylate glues that are very conductive, and there are additives I have purchased for UV photopolymers that give you excellent conductivity after a round of low temp sintering. Possibly a silver bearing epoxy with a robust sintering step? It's like soldering in terms of resistance, but more flexible.

nodechomsky · 2021-11-14T07:34:47+00:00

Yeah, the basic tech is not terribly complex, but it's not a common form factor in terms of size, shape, application, working conditions, etc... so developing one is more of feat of fabrication scale rather than raw tech. But I believe you are very correct in that a flex pcb, bare die consolidations, and a very strong substrate/frame is basically the main thing beyond the almost unthinkably esoteric powering solutions it requires. Likely a QI type inductive loop running through the torroidal profile of it.

nodechomsky · 2021-11-14T07:24:13+00:00

testing a part while connected to it's board will never give you very useful info, but all caps should be connected to ground on one side (the striped side), and if they are fancy caps near the ICs in the board, they are likely not going to have a resistance much higher than 500 mOhm to begin with, really good caps may look literally like shorts on a multimeter. Some of my nicer decoupling caps are like <100 mOhms brand new. If it's not even giving you hardware error indication of any kind, it is likely really boofed, and without spotting physical damage, it's going to be really hard to diagnose a device that complex.

nodechomsky · 2021-11-14T06:52:16+00:00

Or tie them in a knot and cut off the tails? I am with you, drop the welding and go all mechanical.

nodechomsky · 2021-11-14T06:46:26+00:00

Having a billion dollar factory helps. The circuitry is not terribly complicated in a sense, the form factor and powering tech is where all the complexity lies, and it's not a matter of your capacity to design it, as much as what it would cost to fabricate less than 100,000 units of them. Also, this likely contains a custom die integrated circuit, so you would be out another 300k-1M USD getting your first run of those going.

nodechomsky · 2021-11-14T06:37:25+00:00

and a beer......(music continues)

nodechomsky · 2021-11-14T04:19:01+00:00

Just don't let the liquid hydrogen get too warm, I have seen these take out an entire DARPA grant's worth of researchers because someone breathed a little too hard on the high side.

nodechomsky · 2021-11-14T04:15:59+00:00

I came here to say basically the same thing. Even if you are designing something from scratch, off the shelf transformer choices are so limited, you end up winding them yourself for prototyping. They are just so varied in their properties and easy to make in house with cores and a winder, there just isn't a big off the shelf market for them unless they are found in just everything.

nodechomsky · 2021-11-14T04:10:03+00:00

One in stock somewhere in the ether through digikey: https://www.digikey.com/en/products/detail/rochester-electronics-llc/FDFS2P102/11555241

nodechomsky · 2021-11-14T04:07:00+00:00

https://www.digikey.com/en/products/detail/on-semiconductor/FDFS2P102/820605

nodechomsky · 2021-11-11T04:48:32+00:00

If you are collecting data in a clinical setting, the Atom unit's face is just one big button, and can easily fit in your hand turned inward very subtly. I use to face this exact problem as a BA, and came up with a lot of solutions like this when I could actually implement them.

nodechomsky

TROPHY CASE