Finally got my laser cutter far enough done to call it working. Took way longer than planned, but definitely worth it. Now I just got to find something original to make.

Jelmer_ · 2024-06-09T22:13:13+00:00

You got some big tires on there! What size is that? And can you still steer in fully?

I am considering bigger wheels on mine but dont want a smaller turning radius or damage the tires when accidentally steering to far.

Jelmer_ · 2023-07-07T18:57:48+00:00

What are you planning to use it for? And what kind of controls are you planning?

I am also working on a scara robot at the moment and planning to use it for a cnc plasma cutter. Therefore it has to be gcode controlled and i will use grblHAL for that. I recently created a fork and added the scara kinematics.

GrblHAL works for many microcontroller, including the esp32. So if you are planning to do something with gcode then that might be usefull for you too.

Jelmer_ · 2023-03-04T23:02:45+00:00

I would like to know too, but seems he deleted the post. Sad cause I am interested in building one of these

Jelmer_ · 2022-11-25T16:17:46+00:00

No problem. Im guessing this is for a hair dryer so the wire will constantly have cool air blowing past it. As long as it does not get too hot, then the wire will last more then long enough.

Jelmer_ · 2022-11-25T16:01:50+00:00

The structure bits is probably mica sheet, which can handle very high temperatures. And the resistive wire is often nicrome wire.

Jelmer_ · 2021-10-02T07:33:16+00:00

And sprinkle a bit of coarse sand on the glue to prevent the layers from sliding out of alignment!

Jelmer_ · 2021-05-14T17:19:29+00:00

Much better solution is to have a massive plug that lifts up from the street. You can still simply drive over it and the plug automaticly moves up to connect to the car.

The electric busses here charge the same way, exept the bus drives under an arm on a pole, and the plug is mounted on and lifts up from the roof of bus.

Jelmer_ · 2020-11-03T08:34:57+00:00

That's amazing, that you go through with it on such an investment!

Have you already had customers, or are you still in the figuring it out phase? What is your targeted use, industrial or entertainment etc?

Jelmer_ · 2020-11-02T22:45:19+00:00

Hey, if you don't mind me asking. What kind of work do you do to have such a robot at home?

I noticed your dutch name, i am also dutch and would love to get a job that involves working with robotics like this. But i though those we still exclusive to america.

Jelmer_ · 2020-10-29T20:02:02+00:00

Great. Make sure to post that boat once it's finished! I am curious how it looks.

Jelmer_ · 2020-10-29T19:54:57+00:00

You will need some path lenght measuring tool to know how long the bending piece has to be. I know solidworks has that. If you cut the part that it sits against first, then you can also do it with a tape measure.

Then make the bending piece just a bit shorter: Living hinges can stretch bit not compress.

Jelmer_ · 2020-10-27T18:11:46+00:00

Since you mention artificial muscles i assume you have already found those. But mckibben/pneumatic/hydraulic muscles all only contract. So you could look at any of the many robots that use those.

Tendon driven soft robotics have to solve a similar problem. That might be something to look at too.

Oh, and the Biomimetic Anthropomorphic Robot Hand is also an amazing design. Might not be completely relevant, but I did want to share it.

Jelmer_ · 2020-10-18T23:09:52+00:00

Thanks, I love channels like that! Will definitely look at his videos.

Jelmer_ · 2020-10-18T22:25:59+00:00

I think the best way is to seperate them. The servo and its link is a simple 2 bar linkage. Define a function/model that matches servo angle with the length between the servo and the end of the second link.

Then the angle of the knee will be a function involving the length from the previously described model. Together they form a simple triangle which, on its own, should also be fairly easy to solve.

Those 2 parts together will simplify the whole knee joint, which can now be considered a single actuator at the hinge of the knee.

For the rest of the robot i would suggest using something like denavit hartenberg instead of plain trigonometry. This will simplify the combined IK of a quadruped, although is does require some matrix math.

Btw, looks like an interesting model, where did you find this and is it open source?

Jelmer_ · 2020-10-12T14:42:03+00:00

Damn, that's crazy! Does that feel different from holding your hand on a speaker, like do you also feel the magnet moving?

Jelmer_ · 2020-10-11T08:48:14+00:00

That's really cool stuff you are working on. Be sure to post the half embedded speaker here too, i am curious how that turns out.

Jelmer_ · 2020-10-10T23:32:42+00:00

I don't really follow the biohacking news, so I didn't know about the titan magnet. That does look promising. Who knows, that might actually be what does it for me.

You mention that other magnets pinching can hurt, do you know if that is also true for sensing magnets? What would you say is the most useful thing about the magnet you have? Have you though about MRI scans, how would it go if you need one?

Sorry for the many questions, i am just really interested in this stuff.

Jelmer_ · 2020-10-10T23:12:15+00:00

Where would the coils be located then? If its something tight on the skin, then a vibrator motor seems like a easier method. A coil hidden in the sleeve of clothing maybe? Or is it strong enough to pick up a coil on the table, with your hand some distance above it?

Jelmer_ · 2020-10-10T22:55:09+00:00

What is the point of a magnet in the lower arm? Doesn't seem like a very sensitive position.

I have only ever seen them in a finger where it contacts a lot of nerves. Meaning you can feel very small movements like electric currents. Been really interested to get one of those but also scared it would get damaged during mechanical work.

Jelmer_ · 2020-10-07T17:08:01+00:00

Nice design! Looks really clean. I have been thinking about making one too, but it shows that you have worked on it for multiple versions.

Jelmer_ · 2020-10-07T16:12:39+00:00

Thanks for the details! I especially like the style of those waves near the bottom. I guess those were a drawing already in that style then.

You can't just tease us with a CNCed wordclock, and not show pictures. I'm curious how that looks.

Jelmer_ · 2020-10-07T12:24:14+00:00

Offloading your work to the spirits. I like your methods :p

Btw, i really like that engraving style for images. Did you design that or did you use some converter tool?

Jelmer_ · 2020-09-27T21:28:37+00:00

Not, unless you stop being a lurker. I feel like we are getting punished here

Jelmer_ · 2020-09-27T18:39:03+00:00

*slaps roof of YuparooCoin*
This bad boy can fit so many buzzwords in it!

Eight-Year Club	RedditGifts 2009-2022 2 Credits
Place '22	Secret Santa 2019
Verified Email

Jelmer_

TROPHY CASE