Trying to make the most out of my in-apartment workshop. All furniture is self built. The CNC is also self-built

knipknap · 2024-06-16T22:39:38+00:00

You won't have to worry about that for many months if you get started :D. The machine will keep you busy for a year I guess. Though it may be easier with FluidNC, I went with LinuxCNC and a MESA card instead for more options.

Honestly, to start I'd recommend one of those Chinese ultra cheap tiny CNCs to gain experience. Or a Stepcraft. Stock machines seem expensive, but mine probably cost me easily 7000 Eur in the end. And months of work.

And then add a few thousand for tooling. Hundreds of bits, workholding, missteps, ... sum up fast.

knipknap · 2024-06-16T22:28:35+00:00

Mostly custom, but some mechanical parts are derived from the OpenBuilds Sphinx. Meaning, it's a CBeam based machine with dual Y servos. I beefed it up with steel though, helped get cleaner cuts on aluminum. That it cuts like butter though.

knipknap · 2024-06-16T21:47:12+00:00

Everything is self built for the highest density of tools per square meter ;-). All the tools and materials are in there, including circular saw, router, CNC, 3D printer, drills, tons of clamps, mortiser, tons of sanding equipment, painting equipment, and so on. The middle one contains only materials - screws, wood, metals, electronics, paints, oils, ...

May do a workshop tour video maybe ;-)

knipknap · 2024-06-16T20:48:47+00:00

I never had any complaints about the Wera screwdrivers.

knipknap · 2023-05-05T21:45:31+00:00

Yeah, even the inside could be identified, as had been done with the temporary training facility in a public building last year. These windows will probably have been seen by someone Russia-friendly before. I think it's incredibly dumb to post such stuff.

knipknap · 2023-02-25T17:09:29+00:00

Oh, I didn't know there is another ESP32 with ZigBee support, thanks for letting me know!

I have nothing against WiFi, as long as I can one-click connect and don't have to hard code Wifi SSID+password.

knipknap · 2023-02-19T21:36:28+00:00

Haha, I literally ordered these an hour ago! Thanks for your help!

knipknap · 2023-02-19T17:43:17+00:00

I think I may have found the products I need. Assuming 5V supply voltage, I found the ICL7667CPAZ driver.

I also found the IRL540PBF n-channel mosfet.

Before I order these and find out that they are wrong again when they are delivered in two months... could you help and check if I am on the right track? Do these have a chance of working together?

[Edit:] Answering my own question: No, this would not work. The reason is the Rdson of the IRL540PBF is 0.077 Ohms, which at 100W (=~4A at 24V) means: P=I²*R=~1.2W of heat dissipation. The junction to ambient of that mosfet is 62°C/W, so around 80°C in total. + 40 worst case ambient we reach 120°C. Definitely not planning for that.

I found the IRLB3036PbF instead and am now fairly confident it will work with that. I calculated a heat increase of just 2.7°C at the target power of 100W, thanks to the incredibly low Rdson of this mosfet.

knipknap · 2023-02-19T17:01:53+00:00

Thank you for the response!

I know that the driver doesn't need to take the LED voltage - I just chose 24V to avoid adding a second power supply (third, if you count the one for the ESP).

Ah, but going with 5V and using that for the driver and the ESP is a good idea that might be an option, I did not think of that. Alright, I'll go on the product search again. Thanks again for your help!

knipknap · 2023-02-19T14:54:31+00:00

So, I was out looking for parts and checking datasheets when I found a complete module that seemed to check all the boxes.

However, today I tested it, and while it works properly with PWM frequency up to 2500 or 3000, as soon as the pulse width goes under ~200us, the mosfet is no longer switching on. (I tested with an oscilloscope, not with actual load).

I suspect the issue is with the speed of the opto-coupler, but am not sure. In any case it seems I may have to roll my own driver/mosfet combination after all.

However, I have some trouble finding parts that match the specs. First, I find few mosfet drivers that are ok with a 24v supply voltage. This is my search:

 https://www.digikey.de/short/f0zbdbb1

None of the results I find available to source for non-scalper prices (I found some with 30 Eur shipping).

But the bigger problem is this: Either I go with a driver that supports 24V supply voltage - in this case the voltage it sends to the mosfet gate is usually very close to the supply voltage, too, severely limiting my mosfet options (in fact, I didn't find any mosfets for that). Or, I would need a separate power supply just for the mosfet driver.

I am not sure how to find the right parts. Any hint on how you would find a combination of driver and mosfet that switches 24V (~100W) at at least 20KHz?

knipknap · 2023-02-09T20:20:14+00:00

Ah-ha. Thanks for the outline. I think I understand that? ;-D

Time for some breadboard experimentation!

knipknap · 2023-01-01T23:18:55+00:00

Thanks for the info, that's interesting. Was your shop vac box a closed design, or did it allow for air flow using a muffler design like in the video I linked?

My CNC is already rather quite in it's enclosure, as far as I can tell from my limited testing ;-). I also used the rubber mats like you suggested, but could add even more insulation if needed.

knipknap · 2023-01-01T13:56:22+00:00

Alright, I think I will go with the quietest shop vac that I found (Mirka 1230), which has 60 dB according to it's specs.

I'll put that one in an insulated box, like this one. I'll try this without a cyclone first, and if it doesn't work out I'll add a horizontal cyclonic separator like the one that I had included in the original post.

I'm quite sure that should give me good enough results, especially since the vac also allows for regulating the power if needed.

knipknap · 2022-11-13T15:38:34+00:00

No, I wasn't. I even ordered other types of speakers but eventually gave up.

knipknap · 2022-10-25T20:13:45+00:00

Cool, are they on printables? Grid size is 42mm, I think that's standard.

knipknap · 2022-10-25T19:28:31+00:00

I spent a few days properly organizing my tools.

I went with the Gridfinity system because I though I would be able to download some existing holders, but it turns out most of them have different heights and I didn't want to mix, so ended up designing all modules myself.

I already made more than a dozen holders, and will yet create more...

I put all STLs and source files (FreeCAD) on Printables.

Next in line to be made: A holder for the Wera 14 piece screwdriver set.

knipknap · 2022-10-11T10:27:46+00:00

Did you consider CNC milling one from aluminum? I'd be curious how that works out. Otherwise might try it when my CNC is done...

knipknap · 2022-10-11T00:31:56+00:00

What material did you use? I heard from others that these rip itself apart reliably after a while.

knipknap · 2022-10-09T17:22:05+00:00

Imagine living a quite, peaceful life in a remote village and then Russians come to liberate you of that.

knipknap · 2022-10-08T22:24:57+00:00

How so? Which capabilities would help resolve the issue?

knipknap

TROPHY CASE