moira,
@moira@mastodon.murkworks.net avatar

this screw sounds like my budgies nattering when they’re happy wtf xD

moira,
@moira@mastodon.murkworks.net avatar

THERE IS NOW ANOTHER BIRD JUST OUTSIDE YELLING BACK AT MY WOODBLOCK BOLT BUDGIE

moira,
@moira@mastodon.murkworks.net avatar

i may have caused a minor diplomatic incident

amongst the birbs

moira,
@moira@mastodon.murkworks.net avatar

hm very quiet suddenly

either saner heads prevailed

or a hawk showed up

moira,
@moira@mastodon.murkworks.net avatar

anyway this is what i was making, it’s a test object to let me add a bike trailer

but a real version wouldn’t be that different i don’t think

moira,
@moira@mastodon.murkworks.net avatar

like so

but it isn’t good, the carrier is too close to the wheel

jigmedatse,
@jigmedatse@social.jigmedatse.com avatar

@moira It doesn't look like you'd want it that much further from the wheel though.

moira,
@moira@mastodon.murkworks.net avatar

@jigmedatse At that distance in that position it hits the wheel in various easily-created and realistic circumstances. It also does it with another few cm so I need more like 10-15 for safety.

moira,
@moira@mastodon.murkworks.net avatar

the solution is not complex

i think i’m close enough to render a thing in plastic which would let me create a millable digital object

moira,
@moira@mastodon.murkworks.net avatar

digital modellllll

the trailer attachmentw ould bolt into the hole at the far end

(extra long for extra distance)

(maybe too much distance?)

(that's what test prints are for)

rfunk,
@rfunk@mas.to avatar

@moira I don't know much about the strength of PLA but I look at that and imagine it snapping. Have a strip of metal you can drill and attach for the long part?

moira,
@moira@mastodon.murkworks.net avatar

@rfunk This is a test object for fitment purposes. I will not use it for load bearing under any circumstances.

(Hence using this to design an object for millable purposes. As in milling metal.)

rfunk,
@rfunk@mas.to avatar

@moira Ah, sorry, I missed the milling bit.

moira,
@moira@mastodon.murkworks.net avatar

@rfunk if I have to, I'll make the main bit out of wood, and use a metal bar for the long piece. But hopefully I can do something better than that.

moira,
@moira@mastodon.murkworks.net avatar

also produces PLAletric power maybe

moira,
@moira@mastodon.murkworks.net avatar

OBJECT

(fitment test only)

moira,
@moira@mastodon.murkworks.net avatar

that’s much better. I need to tilt the sail back to make it lever properly against the frame and also put in some kind of attachment point for a slim securement - even a zip tie would be good I think - for full rotational stability. and maybe some anti-flex supports on the long piece. but the wheel distance is good now and I think in metal this should be okay.

#BikeTooter #maker #3dPrinting #prototype

NewNordicNormal,
@NewNordicNormal@c.im avatar

@moira looks good. Inspiring me to finally make something!

moira,
@moira@mastodon.murkworks.net avatar

@NewNordicNormal it’s fun! plastic isn’t strong enough of course - this thing can’t even hold up the full weight of the trailer in PLA. But it’s great prototyping fun and that’ll get me the right object to render in metal!

(worst case I’ll send the digital file off to one of those commercial services)

pbl0m,
@pbl0m@phpc.social avatar

@moira @NewNordicNormal I actually was asking myself if that will survive the first tour 😄 But if you'll replace it with metal you should be all good😉

On the other hand I'm interested if it's possible to print such a part that would work out🤔 Maybe in carbon fiber with a different orientation.

moira,
@moira@mastodon.murkworks.net avatar

@pbl0m @NewNordicNormal I keep saying that the final will be milled or otherwise in metal and people still go "that plastic won't hold up." That's one of the reasons I've started mentioning it every post.

I don't know what orientation would likely be better than this one; the layers (which are the strongest part by a lot) run the length of the piece.

The right material might make a lot of difference but I'm really not coming up with much that'd survive.

If I were to try to make it with plastic - even high strength plastic - I'd change the design rather substantially, making the long attachment bar much thicker and make it also be the actual hitch itself, rather than allowing the hitch to bolt onto it. I think that could work.

moira,
@moira@mastodon.murkworks.net avatar

@pbl0m @NewNordicNormal It'd end up looking something very roughly like this I think - you'll have to excuse the blockiness and barbaric lack of chamfering, I'm afraid:

moira,
@moira@mastodon.murkworks.net avatar

@pbl0m @NewNordicNormal But I still have severe doubts about it surviving for long - at least, with any plastic one could actually print.

iris,
@iris@neuromatch.social avatar

@moira would a bit of bending do the trick? (Maybe this is a terrible idea, idk)

wlukewindsor,
@wlukewindsor@c.im avatar

@iris @moira I think bending the arm might indeed be bad! I know the clearance isn’t that great but to my eye it doesn’t look that bad…

moira,
@moira@mastodon.murkworks.net avatar

@wlukewindsor @iris it's worse than it looks, i mean, at the moment of that photo it's okay but even just steering the bike gets it close enough to make contact and that's bad

moira,
@moira@mastodon.murkworks.net avatar

@iris nooo I don't want to bend it, that's harder than it looks and I don't have the tools

I know what I need to do and that includes knock off some pieces in CAD and that'll let me get to a shape I can use and that I can either have milled or shape myself out of non-scrap lumber, i think ^_^

dabblecode,
@dabblecode@techhub.social avatar

@moira when I was a kid, I had a book about birds that came with a little birdcall device, which ammounted to a wooden bead around a small metal shaft. You would twist the bead around the metal shaft with a little pressure, and the friction would cause it to "chirp". Sounds like you have something similar going on here.

dabblecode,
@dabblecode@techhub.social avatar

@moira I didn't find the book, but the bird call is called an audubon birdcall:
https://www.ctexplored.org/the-simple-genius-of-the-audubon-bird-call/

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