@mcdanlj@social.makerforums.info
@mcdanlj@social.makerforums.info avatar

mcdanlj

@mcdanlj@social.makerforums.info

1st Fedora Project Lead. Co-author Linux Application Development. Sr. Director Engineering Pendo. Ex-{Linux Journal, Red Hat, rPath, SAS}. Christian. Father. Maker (including machining, 3D printing, and electronics). Books. Classical music. Aviation (inactive PP-Inst-SEL). https://musings.danlj.org/

#searchable searchable (please index my posts for search purposes)

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

orly‽

goeland86, to random
@goeland86@social.makerforums.info avatar

Sharing knowledge is one of the reasons I'm a maker and involved the local Fablab. I also write articles for All3dp occasionally. Last one just got published: https://all3dp.com/2/klipper-sensorless-homing-simply-explained/

mcdanlj,
@mcdanlj@social.makerforums.info avatar

@goeland86 I haven't used sensorless homing with klipper (I gave away my printer with Marlin set up for sensorless homing) but at least in Marlin, and I thought also in Klipper, you can reduce the bang (noise and wear-and-tear) by homing at a lower current. I did that and got reliable homing with a mild tapping sound. I tuned both homing rate and current on Marlin until I was satisfied.

Since the description of stepper motor operation ignores polarity, what would you think of linking to a good description for those who want details? Something like this one? https://theengineeringmindset.com/hybrid-stepper-motor-basics/ — there are lots of others; this one goes straight to the hybrid steppers we use in 3D printers, rather than taking a walk through all the other (older, generally) kinds...

mcdanlj,
@mcdanlj@social.makerforums.info avatar

@goeland86 Or I missed it... I was reading on my phone and the pop-up ads did sometimes get in the way of the content. 😢

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

Still multiple possibilities without much chance of disambiguation; I'll take it.

Wordle 694 4/6*
🟨🟨⬜🟨⬜
🟩⬜🟩🟩⬜
🟩⬜🟩🟩⬜
🟩🟩🟩🟩🟩

adafruit, to random
@adafruit@mastodon.cloud avatar

Facebook is claiming our video show and tell where people share art, electronics, modified wheelchairs, and other projects, is hate speech now. There was no option to have it reviewed only to "agree" so no one sees it.

mcdanlj,
@mcdanlj@social.makerforums.info avatar

@adafruit Every time I'm tempted to give in and sign up for a Facebook account, I become aware of something else stupid they have done like this. They also do stupid things like this when I'm not tempted to sign up; there seems to be an unending supply of untrustworthy and stupid behavior on my part.

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

Only two vaguely reasonable words left for third, by my guess.

Wordle 693 3/6*
🟨🟨🟨⬜⬜
⬜🟨🟨🟩⬜
🟩🟩🟩🟩🟩

trevorflowers, to random
@trevorflowers@machines.social avatar

The eternal unease of discarding mystery parts. Where did they come from? Are they important? If I need them later will I be able to replace them? 🤷

mcdanlj,
@mcdanlj@social.makerforums.info avatar

@trevorflowers That's what r/whatisthisthing (or whatever that subreddit is called...) is for. 😀

trevorflowers, to random
@trevorflowers@machines.social avatar

I'm usually happy watching Inheritance Machining but for some reason today I'm deeply jealous of and grumpy about this sort of wealth transfer.
https://youtu.be/0oJDy3OVxu8

mcdanlj, (edited )
@mcdanlj@social.makerforums.info avatar

@GustavinoBevilacqua @trevorflowers I liked when he was doing something simple and sketched it out freehand using "AutoPAD" 😀

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

Do pixel phone panormas work here? This got all screwed up on facebook. (Jay Cooke overlook) Hmmm, looks like it's just the raw image without the zoom in and pan around part.

mcdanlj,
@mcdanlj@social.makerforums.info avatar

@clolsonus Yeah, same raw full panorama using the viewer on — I don't know whether there is an open source component for what you are looking for. If there is, a PR to might be faster than a PR to the mastodon FE. ☺

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

I felt really good when I saw the second guess pop up so green. Then realized that there were four perfectly good guesses left to go... 🙄

Wordle 692 3/6*
⬜🟨⬜🟨⬜
🟩⬜🟩🟩🟩
🟩🟩🟩🟩🟩

warthog9, to random
@warthog9@social.afront.org avatar

Well I'm both amused, and concerned, that somehow @kwf and I are slowly becoming one of the largest FOSS mirrors in the UK?

mcdanlj,
@mcdanlj@social.makerforums.info avatar

@warthog9 @kwf "Slowly"‽

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

Apparently my AliExpress order of a 10 pack of PG7 cable glands reproduced during shipping and became 100 PG7 cable glands. 😲. Probably amounts to a life time supply for me. 😁

mcdanlj,
@mcdanlj@social.makerforums.info avatar

@NedMan Inattention to zeros reminds me of the 1000db air horn product page image going the rounds recently...

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

My strategy was sub-optimal today.

Wordle 691 5/6*
🟨⬜⬜⬜⬜
⬜🟨⬜🟨⬜
🟩🟩🟩⬜⬜
🟩🟩🟩⬜⬜
🟩🟩🟩🟩🟩

attoparsec, to random
@attoparsec@clacks.link avatar

Finally picked up a fast-change collet chuck for the lathe. In good shape, too, it just needed some regreasing to get it to spin freely. Also grabbed an old set of hex collets -- hex collets are so cool! Next I need to build some collet racks to go in the lathe tooling drawers, now that I'm getting serious about my 5C collection.

mcdanlj,
@mcdanlj@social.makerforums.info avatar

@attoparsec TIL that there is a 5C collet chuck that's as fast as an ER collet chuck! Does it use planetary gears to transfer from the hand grip to the collet thread?

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

Tonight, I got the cabinet screwed to the back of the lathe, and the supply wires connected to the primary electrical box.

The power sequencing works. When I turn on the lathe e-stop, it powers up the control board and the fan; when I arm the lathe to run, the contactor powers up the power supplies for the servo and the (future) toolpost grinder spindle.

The lead screw console lights up but doesn't display, so I think I have an electrical problem somewhere in between. Probably a bad connection. If I'd been smart I would have buzzed it all out on the bench, but I got impatient.

Power to the servo means that I can try auto-tuning servo parameters with it driving the carriage, regardless of when I fix the console.

The easiest solution for the console is probably to temporarily give up on the aviation connectors and just make a new cable and run it through glands without disconnects. That would be 32 solder joints fewer to fail. Then I can put the cable set with the aviation connectors on the bench and figure out what is wrong with it when I feel like it. (Never?)

Anyway, feels like I'm getting close. Might be next week before I have enough time to finish it, but despite the console problem I'm feeling OK with where this is now.

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

I was a small amount surprised that was a wordle word.

Wordle 690 3/6*
⬜⬜🟨⬜🟨
⬜🟨⬜🟩🟩
🟩🟩🟩🟩🟩

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

Very little time tonight to work on the . Just wired up the 4-pin aviation connector for the toolpost grinder motor. Right now using only two conductors for DC, but this lets me upgrade to 3-phase ESC/VFD later if I want to. Also modeled spacers to hold the M6 mounting screws captive to make installation easy and avoid scratching the lathe with the mostly-flush screws.

mcdanlj,
@mcdanlj@social.makerforums.info avatar

@makergeek The toolpost grinder is not really related to the ELS. It's just that I'm picking power off the lathe's primary box, and I want a toolpost grinder. So I'm putting the servo power supply and the toolpost grinder power supply both behind a secondary contactor that is energized when I arm the lathe, and the box is sufficient for both the ELS and the (future) toolpost grinder.

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

Bad news on my curb find hover board. It has a split battery pack and 1 side is visually bad with corrosion cause by leaking cell(s).

Interesting enough the input voltage is 29.4V so I was expecting a battery with 8 pairs of cells for lithium ion (3.7V). Instead it has 7 pairs and is a 25.9V battery.

I can’t find a drop in replacement and rebuilding the battery doesn’t really seem cost efficient.

Not sure what to do with it though. Maybe I can use the motors for something later.

Picture showing the battery label indicating it is a 25.9V battery.

mcdanlj,
@mcdanlj@social.makerforums.info avatar

@NedMan A dead hoverboard with spicy batteries? Say it ain't so, pal!

😀

Full charge for most Li-Ion cells is around 4.2V — 29.4 / 4.2 = 7

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

A slog, easily explained by my weird wordling.

Wordle 689 5/6*
⬜🟨⬜⬜⬜
🟨⬜🟨⬜⬜
⬜🟩🟨🟨⬜
⬜🟩🟩🟨⬜
🟩🟩🟩🟩🟩

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

Spent a little bit of time on the tonight. I got various sizes of label-printer heat shrink tubing today and WHERE HAS THIS BEEN ALL MY LIFE‽ and now I'm seriously pondering disassembling three dozen connections to add more labels to wires in the box.

I created a toolpost grinder control cable with an aviation plug on one end, and inside wired the matching plug up to the associated power supply. With heat-shrinked labels on both ends of every wire. I just need to add a few more wires for the toolpost grinder motor (I'll use a 4-pin aviation plug even though I need only two for the DC motor I'll be using now). I don't know when I'll get around to the physical build for the toolpost grinder, but at least when I do I'll have the power ready. I don't really want the TPG project to get in the way of the ELS project but the rubber blanks in place of aviation plugs ate at me.

While is my tool of choice for schematics, it's probably the wrong tool for the schematic that I'll put on the inside of the ELS cabinet. I seem to remember having some basic electrical symbols, and that might be the right tool for the job... Yeah, I see it has several sheets of the right symbols for this. Any other tools I should consider for simplified schematics?

mcdanlj,
@mcdanlj@social.makerforums.info avatar

@smellsofbikes Yeah, real schematics I do in — this one I just want to be stylistically aligned with the host system. ☺

mcdanlj,
@mcdanlj@social.makerforums.info avatar

@rrmutt @mbeckler As it happens, that library doesn't have most of what I need. Also, dia can let me move individual connected components and preserve the wiring between them. ☺

mcdanlj,
@mcdanlj@social.makerforums.info avatar

@craftyjon Yes! This looks like the kind of tool I hoped existed. And the current version is in Fedora, making it easy for me to try.

Thank you!

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

Oh no. Today one of the bearings on my treadmill motor went bad, and the noise is annoying. Replacing bearings isn't that hard, but I don't know what size they are to order replacements. So my plan is to break the motor down right after work, measure and order replacement bearings, and then hope they arrive before my next scheduled WFH day. 🤞

mcdanlj,
@mcdanlj@social.makerforums.info avatar

@GustavinoBevilacqua So I could have checked whether both bearings were 6202 but I didn't.

It makes sense for a treadmill motor to have the heavier-duty bearing at the flywheel end, and a lighter-duty bearing at the opposite end where it is subject to far lighter forces.

So I have one 6202 bearing installed and one spare 6202. A pair of 6203 bearings (now I'll have a spare of those, too) arriving tomorrow so I can complete the repair.

mcdanlj,
@mcdanlj@social.makerforums.info avatar

@GustavinoBevilacqua It's working again.

The bell didn't need facing on the lathe, that was an illusion. (I didn't figure that out until I had dusted a couple thou off it, though.)

I tried to assemble the motor with the flywheel already on the shaft first, which didn't work. So I tried again with the flywheel off and it was fine. The only real trick was getting the brushes over the commutator; I used shim stock to slide the brushes past the bearing and over the commutator, then pulled it out. The rest was pretty straightforward.

Then it was just getting the bolts through and sticking my fingers through the bell on the output end to line them up with the threaded holes.

I did need to press the flywheel back on with the hydraulic press.

Then I just had to re-install it on the treadmill and tighten it until the belt quit slipping, and lock it in place. So far the sound is gone.

Hopefully I don't hear noises from the front roller bearings tomorrow! 😆

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