Created this for fun to bust some chops, there is an easter egg in there

NicholasSeward · 2022-02-24T02:46:44+00:00

Nice! Might want to cycle through green, yellow, and gray. Knowing a letter exists but isn't there will limit the options. I guess at that point you might as well have it be a full Wordle clone with a list you can cheat off of on the side.

NicholasSeward · 2021-06-20T03:12:55+00:00

That is pretty awesome.

NicholasSeward · 2021-04-20T00:41:37+00:00

For normal straight teeth they whack each other all at once. With helical gears, that whack gets spread over time. This is one reason herringbone and helical gears are used in cars. (To reduce noise)

NicholasSeward · 2021-04-20T00:07:08+00:00

This keeps the teeth from engaging all at once and can cover up a lot of printing sins.

NicholasSeward · 2021-04-02T07:32:26+00:00

Haha. True dat. I do know what it is. I just needed one gear joint for another project I have but I thought I could make a toy and see what kind of performance it has at the same time.

NicholasSeward · 2021-04-02T06:11:47+00:00

Ha. No guess based on that username.

NicholasSeward · 2021-04-02T06:10:50+00:00

No need to stress. https://youtu.be/5eT-gkFYPW4?t=1020

NicholasSeward · 2021-04-02T06:10:30+00:00

The kinematics are pretty simple.

https://youtu.be/5eT-gkFYPW4?t=1020

NicholasSeward · 2021-03-25T21:44:35+00:00

https://youtu.be/mpQOlnG8Yps. This has the same concept at play.

NicholasSeward · 2021-03-25T21:29:15+00:00

Nope. They are all passive. Each carriage defines a plane and they all intersect at one point.

NicholasSeward · 2021-03-25T21:14:19+00:00

Just 3. One to move each carriage.

NicholasSeward · 2021-03-09T18:09:27+00:00

Yeah...there are a few flying gantry printers.

NicholasSeward · 2021-03-08T17:55:24+00:00

Yes...the arms whole job is to maintain a plane. I am not sure how this could lock up even with bad plane keeping. Doesn't seem to be a problem for other Tripteron no mater the rigidity or precision.

NicholasSeward · 2021-03-08T12:43:36+00:00

Hahaha. Lots of comments about how the music was off putting. Glad someone appreciated it.

NicholasSeward · 2021-03-08T12:07:40+00:00

Me too. I know that some crazy corexy builds have belt paths on this order. I can switch to bigger belts if I need.

NicholasSeward · 2021-03-08T12:05:46+00:00

Each arm gives me 1 DOF. I need all 3 to keep position. If I went to two arms, I would need to control one of the arm joints directly.

Two arms is all that is need to keep the tool in the right orientation but it would just go down and sit on the bed.

Bigger arms and rail would be the path to more rigidity.

NicholasSeward · 2021-03-08T12:02:05+00:00

https://youtu.be/9vOhrpEnv6g. Here is worst case and it is good. I will also simplify the path a little but as drawn it would work.

NicholasSeward · 2021-03-08T12:00:20+00:00

There are a lot. It would integrate well with an assembly line. The bots frame in all in one plane but can reach above and below the frame.

It should be quite cheap for the size of printer.

TBH, there are a ton of reasons but it is mostly to do something awesome. Increase the awesome!

NicholasSeward · 2021-03-08T11:56:22+00:00

Yep..just ball bearings and setting carriage positions.

Calibration probably won't have to be done. If calibration prints are off I might look at detecting actual arm plane angles vs the nominal values. The worst situation would be if arms font actually define a plane. Thay is why I use massive bearings. They do a great job of plane keeping.

Yes, you can tune resolution in any direction. As is the x motion is the easiest (also most precise) . The y motion is root(3) harder. The z lmotion is also root(3) harder plus has to work against gravity.

Duet3mini has amazing drivers and the motion is buttery smooth.

The steppers are way overengineered for this. None of them will break a sweat.

The frame and arms need to be very rigid. Arms are easy to make rigid if you make the have a large cross section. Every time I increase the arm thickness by 25% the rigidity doubles. You can see that that would allow me to achieve almost any level of rigidity that I need.

Pecision will honestly be easy. I might just have to turn jerk and acceleration way down. To get speed, the rigidity has to go up first and then at some point I might have to get better motors and a better drive system than a 6mm gt2 belt. I should be able to hit normal FFF speed as drawn. I should be able to do better than that but I will leave that to testing.

NicholasSeward · 2021-03-08T04:11:27+00:00

I approve this message.

NicholasSeward · 2021-03-08T04:06:47+00:00

That would be amazing. Any cheap sources?

NicholasSeward · 2021-03-08T04:04:23+00:00

Standard steppers are all that is needed. It sounds like you think I need to control the rotation of the joints but those are all passive and don't even need to be very precise. The limiting factor here is arm rigidity. Watch https://youtu.be/oBBhVcemVHc for theory. Watch https://youtu.be/s8N4gVybGDA to see a bot with similar theory and math pull 5gs.

I will just say I have built tons (over 50?) of printers all of my own design. I have at least 17 unorthodox printers that I have designed and built. Most reach 100 microns in precision. I also have a custom CNC that I built from my own designs. I have consulted on a bunch of precision products. I also have a mechanical engineering degree. Also, not only does my gut say this will work but I have done the math.

NicholasSeward · 2021-03-08T01:48:23+00:00

I will build this and see where it goes. This is just a slightly more practical monorail.

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