DoNotDelta

[hot jetty]

like this

which makes it hard

but if i do some belt path manipulation that could be changed

[keen oracle]

this should be pretty easy still

you could even just print a holder

[hot jetty]

yeah printed part on top of the metal

i do wonder about getting it machined all together though

[keen oracle]

you have tensioner on the idler side?

[hot jetty]

that was the plan

[keen oracle]

makes sense, lower weight

[hot jetty]

i was gonna tension by tightening the two idlers together for top/bottom so it pulls even tension on both sides at once

then just clamp it down to the extrusion

[keen oracle]

I don't think that's really doable without matching the belt tensions first

like a 2 step system

[hot jetty]

well with identical tooth count shouldnt it be fine?

[keen oracle]

I don't count on it

[hot jetty]

idk was just a thought

i should have space to move them individually

i was also thinking about doing it motor side

would also give me the easier belt path

[hot jetty]

I think I might do that belt path minus the moving motor

[rich adder]

This whole thread is spectacular lowkey

[quick vessel]

tortle when are you going to just make a lathe so you can make balls yourself

[hot jetty]

i did things

sandwiches belts with a 2mm alu plate

i thought about this for so long last night

i do need to figure out a flag for endstops

maybe i can use a screw

belt geometry shamelessly stolen from @kindred musk

[keen oracle]

are these not thin?

[swift pewter]

Straight lines to the attachment points would be better too, I feel

[hot jetty]

it’s 2.5mm

[hot jetty]

I would think the two thing is better for twisting

[swift pewter]

I meant 2, just in a triangle

[hot jetty]

ohh

ohh I see what you mean

[swift pewter]

Your twisting load will be from joint friction, it won't be much

[hot jetty]

ah

so like this instead

[swift pewter]

Yep

Maybe a bit bigger fillet near the joint

[hot jetty]

sounds good

[hot jetty]

i am sooo tempted to model out the steel cable

would look good for renders

maybe later

the frame has 180 screws in it

(so far)

168 of them are M5x10 socket heads

[flint creek]

F

[hot jetty]

lol i cant remember how to find the arm angle at the center of the bed

[swift pewter]

Sketch it out and do trig

[hot jetty]

yea

[hot jetty]

okay

all that’s left are the not as easy/fun parts

motor assemblies, idler assemblies, tensioner of some sort, electronics

[hot jetty]

I feel like a separate ebox is more work for a worse result.

But I’m not sure

I think I’d rather do like a sidepack

[hot jetty]

so basically to get horizontal belt path

the motor has to be moved in quite a bit

or moved out of the frame

hm

72mm

moving it out of the frame is 45mm

so like

actually not that bad?

[hot jetty]

now the question is if i do tensioning with motor sliding

hmm

i could also maybe do something that presses or pulls on that horizontal straight section of belt?

[swift pewter]

Pythagoras will tell you why it's a huge pain

[hot jetty]

fair point

perhaps just idler tensioning then

idk

[hot jetty]

i think thatll do

we will see

nevermind

forgot the pulleys arent centered

there we go

im trying to challenge myself to make parts look nicer/more unique

not just blocks

i think this one turned out decent

just bolts to the bottom panel

maybe i could have it bolt to the top one too but idk if its necessart

[hot jetty]

got suggested to make the motor assemblies out of sheet metal

threw something together to test pricing anddd

im honestly not sure sheet metal motor assemblies are worth the $200-$250 that it would cost

over just printing a part

[swift pewter]

I don't think so

Like, maybe just bearing holders because plastic is a bit too bendy to hold the bearing where it should under load, but that's all

[hot jetty]

hmm, interesting idea

whatever

i dont think this is worth that much

[hot jetty]

much better

[hot jetty]

well i tried but

there is no way to fit the blowers in the base of the printer

i'll have to put them in the sidepack somehow

[hot jetty]

not looking forward to electronics

[flint creek]

Lol fair

[hot jetty]

need to decide how i want to do the electronics bay

some sort of sidepack

question is if i just use a lot of printed parts or if i use more extrusions/lasercut stuff

i guess that depends on price

[swift pewter]

Just a side panel on one wall and a bunch of DIN rails

[hot jetty]

I would love to do that and am considering it

My only concern is if i travel with this printer

[swift pewter]

For this you could have a simple cover, like a plywood / ACM / whatever panel you bolt on only for transport

[hot jetty]

[swift pewter]

Lace the wiring for extra swag

[flint creek]

Ye

I'd prob do that if space allows

[hot jetty]

Would love to

[hot jetty]

ugh

i hate how much i like it

we will see how the budget works out

[hot jetty]

anywho

im pretty confident im gonna go for 48v

whcih does make wiring more complex

so the 3hc only has one power input and that has to be 48v

the 6hc has 2 inputs, 2 voltages

so that should be uhhh

well, hm

one has to be 48

now I can either have the other be 5 or 24

I’ll still need 24 either way for heaters stuff I think? but it’s a question of if the board gets it or not

having 5v data and being able to kill the others for safety would probably be nice?

but there’s no way to keep the 3hc powered if I kill 48

wait

minimum 12v for vin

but there’s a 5v header

does 3hc have one of those 5v headers

it appears it does not

and I also don’t think that 5v input powers the mcu?

and I guess the high amp input is only for out0

so im gonna need to give both boards 48v and then heaters and stuff get 24v through just psu and then control on the negative line?

hmmmm

so there’s no point in a 5v psu I think

I’ll power boards and thus motors off 48, fans and heaters off 24, safety relay on 24

should be ok

[hot jetty]

I do wanna try my hand at laced cables for sure

Question is do I do like, all white wires or something

Or do I do multicolor

[swift pewter]

I'll check the mainboard schematics tomorrow if you want

[hot jetty]

Oh I could look at those, I forget it’s public
All the documentation says the external 5v supply is for 5v output tho and I feel like it would mention if it can power data (and would also be included on the 3hc if it could power data)

[hot jetty]

sheet metal motor mounts are happening

[topaz yacht]

I likey

Oooo CNC mounts too

[topaz yacht]

U could double shear the connector pieces easily me thinks btw. It depends if enough clearance low-key

Granted I assume u checked. But just wanna give words of affirmation if haven't

[hot jetty]

yeah im quite confident its not necessary when mounted to metal

[hot jetty]

effectors will be cnc aswell unless I can’t source them lol

[topaz yacht]

this is a bad assumptionn

[hot jetty]

forces are not that high

I ran fusion sims and all the deflection would be at the carriages not the joints (tho there’s still a significant factor of safety)

[swift pewter]

Mandatory

[midnight bramble]

Simulations
Always remember the golden rule of simulations:
"All simulations are wrong, only some are useful."

?simulation requested by: dead.lock

[hot jetty]

yeah I know

I have plans to just like, test it

this is for 500k accel

[swift pewter]

30 N is quite a bit

[hot jetty]

Gonna put the endstops off to the sides and integrate the endstop flag into the little lasercut belt clamp plate.

Should work well I hope

[hot jetty]

I think it would be funny to mirror polish the carriages and use one of those IR endstops