MisterHW

@MisterHW@fosstodon.org

Studied physics, now into power electronics and RF. PCB design with KiCad, mechanical design with FreeCAD. C/C++, Python to breathe life into things. Likes FEM, FDTD.

This profile is from a federated server and may be incomplete. Browse more on the original instance.

MisterHW, to random

Love seeing @libcamera add support for Sony IMX335.

As part of an ongoing open source project, here's a "part 1" of the documentation: reverse engineering the IMX335LQN pinout.

Next stop: KiCad libs :)

https://hackmd.io/

mcdanlj, to random
@mcdanlj@social.makerforums.info avatar

Just as the new KP.2 covid variant takes off in the US, North Carolina sends anti-masking legislation through the legislature and passes at least one chamber. We have some immoral legislators.

North Carolina gets some things quite right, but this is not one of them. ๐Ÿ˜ฌ

MisterHW,

@mcdanlj How the f* did we get to "anti-masking"? Having individuals become antagonistic or violent due to it is disappointing enough, but when we're not actively pushing into the wrong direction, that's kinda frustrating.

MisterHW, to random

3D printering people: is there a slicer out there that supports layer refining, as in: having regions that are printed with double the resolution?

I've been wanting this as a feature every time I need to print a part faster, but slopes, overhangs or overall tolerances require higher definition. As an example, consider the enclosure panel printed in an orientation that does not require supports. It all went well.. .except for the the upper part of the three holes (more severe overhangs).

image/png

timonsku, (edited ) to random
@timonsku@mastodon.social avatar

Was more sparing with indoor masking on my last days and got the prompt receipt๐Ÿซ 

E: please no advise, I know everything you can possibly think of. It's my first infection and masked on any indoor thing past that one time where I likely got it (crowded restaurant)

MisterHW,

@timonsku

Here's some fresh hopium. Happy to share :)

It'd really be nice if we eventually made a vaccine that actually, erh, reduced infection. I'll keep waiting.

https://www.fu-berlin.de/en/presse/informationen/fup/2024/fup_24_040-lokaler-covid-impfstoff-studie/index.html

MisterHW, to random

Whatever those "Yay I did a thing with #FreeCAD" folk are doing... I'm not getting it.

Making functional parts that have to come out right sucks.

Below is the scrap pile from trying to print a GT2 pulley that goes on a brushless motor.

MisterHW,

@chrishuck In this instance, it was actually a problem with the slicer settings, and https://wiki.freecad.org/FCGear_TimingGear seems to be okay.
Measuring the tip tip diameter was not a good was to determine proper settings.
Re FreeCAD: luckily not justified this time, but I just wasn't having the confidence that the WB actually produces the exact shape (no references given for the profile construction. https://forum.freecad.org/viewtopic.php?t=35899&start=50 addressed that but link rot set in)

MisterHW,

@chrishuck

https://forum.freecad.org/viewtopic.php?p=506803#p506803

See why I'm having trust issues here? What's missing is documentation on how the profile came about and ideally some way to validate the results.

How do we get away from "never believe FreeCAD does the right thing"?

image/png

MisterHW,

@chrishuck Probably someone will need to

  • check all profiles against standards or high quality references
  • make resin prints of a variety of pulleys and
  • document the results.
MisterHW,

@chrishuck That's indeed something I'm no longer fighting (especially since printing in mirror mode on an IDEX usually gives me different results when it doesn't use the same type of filament).
So I clean the holes up with a reamer afterwards. Beautiful results.

MisterHW, to random

is the ultimate teacher when it comes to "you touch it, you own it"

MisterHW, (edited )

@chrishuck Oh, it's much worse than that. The sketch replicates a portion of the contour as external geometry and was fully constrained.

It would have been advantageous here to create a sketch and use Pocket repeatedly, but I didn't anticipate I'd need to modify the notch shape later on.

You lose freedoms until eventually you run into dead ends instead of achieving the desired result.

MisterHW, to random

"A Wideband Circularly Polarized Pixelated Dielectric Resonator Antenna"

:o

https://ece-eee.final-year-projects.in/a/4214-a-wideband-circularly-polarized-pixelated-dielectric-resonator-antenna.html

image/png

mcdanlj, to random
@mcdanlj@social.makerforums.info avatar

I've had browser tabs open to a few Hemingway kits for I think over a year, thinking about buying them but wondering about cost to ship metal stock overseas. A few weeks ago it hit me that I had some UK colleagues about to visit my office, and I asked if they maybe had a few pounds worth of freeboard in their suitcases.

I have some wonderfully kind colleagues, and shipping to our UK office was quite inexpensive.

I now have kits for a rotary broach, sensitive repeatable knurling tool, and clutched die holder, and I'm busy reading the detailed instructions. I'm looking forward to these projects, including the occasional mistake I'll make.

MisterHW,

@mcdanlj collecting reamers is a great hobby though. Congrats to the score.
As a resident of metric-land, I feel the way when it comes to the inverse.

MisterHW,

@mcdanlj 0.2mm undersize in that range. Could try a 5/16" drill and push it though.

mcdanlj, to diy
@mcdanlj@social.makerforums.info avatar

I have a problem. I'm trying to some replacement wood game pieces, and I haven't figured out how to replicated embossed red lettering on wood without embossing tools... Any ideas out there?

https://forum.makerforums.info/t/need-help-to-replicate-embossed-printing-on-wood-without-die-stamping/89380?u=mcdanlj

MisterHW,

gnarly approach: using a 3D printer for pyrography. Rotoforge would (:

MisterHW,

Ah, my reading was it's about producing relief which is then easy to fill in with a bit of paint.

Next idea:
"Custom Brass Signs & Plaques", "Engraved Brass Plaques" yields some adequately priced search results inspiring DIY printing/embossing tools.

The rest would come down to having a small arbor press / machine vise, 3D printed alignment jig and paint roller to get printing.

  • an occasional viewer of the Sacramento History Museum channel
kravietz, to Germany
@kravietz@agora.echelon.pl avatar

agreed a plan to subsidise 10 GW in new fossil gas power plants whose sole purpose is to โ€œclose gaps in wind and solar energy supplyโ€. To make this climate embarrassment a bit sweeter, they are being advertised as โ€œhydrogen-readyโ€ which means for the next decade they will be burning fossil gas (~500 gCO2eq/kWh) with an option to switch to when - and if - the remaining infrastructure is ready. Note that no new coal and gas power plants would be necessary if Germany did not decide to early shut down its fleet of power plants (5.6 gCO2eq/kWh).

https://www.xm.com/research/markets/allNews/reuters/germany-agrees-subsidy-plans-for-hydrogenready-gas-power-plants-53756319

MisterHW,

@kravietz saying it now: I don't think we'll make it past a mandated "20% H2 minimum". I mean, look at the timeline of E10 and E20.

MisterHW, to random

Designing antennas after watching 10 seasons of Stargate be like

https://livrepository.liverpool.ac.uk/3080089/1/A%20Circularly%20Polarized%20Circular%20Antenna%20Array%20for%20Satellite%20TV%20Reception%20IEEE%20EXpress%20Format.pdf

mcdanlj, to 3DPrinting
@mcdanlj@social.makerforums.info avatar

tip of the day

You may have seen the recommendation to print horizontal holes in a teardrop shape to avoid drooping filament at the top.

I learned accidentally that printing threaded holes has the same benefit. The screw threads avoid the harsh overhangs that cause drooping.

I did this as a "oh this probably won't work and I'll have to tap the holes" exercise a few months ago, but now I print horizontal threaded holes with abandon and now know that I can put threads into holes that aren't mean to hold a screw in order to print cleanly. ๐ŸŽ‰

MisterHW,

So.... arc overhangs, but as serrations with small triangles?

MisterHW,

@mcdanlj That's an interesting hint then what arc overhangs are lacking: a fractal dimension. After all, that's the conclusion that simultaneously maximizes the edge contour length while keeping the distance to rigidly supported regions as small as possible.

MisterHW,

was also considering non-planar slicing where the teeth would grow in azimuthal direction w.r.t. the horizontal hole wall. Many approaches have yet to be explored here.

mcdanlj, to 3DPrinting
@mcdanlj@social.makerforums.info avatar

Getting ready to DIN rail mounts for the new brains for my CNC mill.

MisterHW,

@mcdanlj I refuse to make PCBs for M2.5. It's like the Transformers movie ruining the "Transformer" search term, wreaking havoc on an M3 world.
People buying RPi boards should also own solid-carbide 1:50 taper reamers to undo their wrongs.

MisterHW, to random

ChatGPT empfiehlt auรŸerdem: "Tiefer Einblick: Elektrische Handwรคrmer - Top oder Flop?"

MisterHW,

@deshipu It is not being stated, but I doubt it's something special. There are ~1.5-2 mยณ of liquid in the tank and the liquid can't get into cells that are actively venting.

Water has excellent heat capacity. If you replaced the battery with a 20 kg bag of thermite and lit it, it would make the tank 13 Kelvin warmer.

Cooling is the only thing one can do to prevent thermal runaway from expanding to neighboring cells, and it seems pretty good at that.

mcdanlj, to random
@mcdanlj@social.makerforums.info avatar

Here's an example of why we don't close old posts on Maker Forums. An 11-month-old question finally got the answer the OP was really looking for โ€” that would be convoluted if we closed threads out, and probably people wouldn't bother.

https://forum.makerforums.info/t/solidworks-grbl-post-processor/87065?u=mcdanlj

(The tradeoff is that we have to be vigilant against spam posted as comments on old posts, which means that new users who act like spammers get shut down quickly.)

MisterHW,

@mcdanlj I never understood why there is no functionality to apply for a thread to be re-opened.

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