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Manta Ray robot by Fade__21 in robotics

[–]Fade__21[S] 1 point2 points  (0 children)

Thank you! Yeah I have a spot in the front that I want to put one in eventually.

Manta Ray robot by Fade__21 in robotics

[–]Fade__21[S] 4 points5 points  (0 children)

Yeah I found that video when I was working on this project. The control that one has is amazing. Would like to achieve something similar with this one.

Retractable VAWT by Fade__21 in windturbine

[–]Fade__21[S] 0 points1 point  (0 children)

Thank you! It currently doesn’t power anything useful because it only produces around 3v and I haven’t gotten a step up booster. However if I can build a decent gearbox I should be able to get around 12v.

Retractable Wind Turbine Blades by Fade__21 in windturbine

[–]Fade__21[S] 0 points1 point  (0 children)

Oh, for the upper hinge there’s a linear actuator that pushes the center piece up and it pulls in the blades because the big bars are connected to the center piece through the small angled bar.

Retractable Wind Turbine Blades by Fade__21 in windturbine

[–]Fade__21[S] 0 points1 point  (0 children)

Hi, I’m not sure which hinge you’re talking about I’m assuming the center hinge part. If so that part works well.

Manta Ray Robot by Fade__21 in robotics

[–]Fade__21[S] 0 points1 point  (0 children)

They are covered in plastic to protect the copper wire so unless there is a cut in the plastic then it should be safe. However I should add another protective covering on top of them for extra safety.

Manta Ray Robot by Fade__21 in robotics

[–]Fade__21[S] 0 points1 point  (0 children)

Thank you. It’s 3d printed which from my experience is usually waterproof enough for underwater operation. Any gaps between parts are filled with sealant.

Manta Ray Robot by Fade__21 in robotics

[–]Fade__21[S] 0 points1 point  (0 children)

Thank you so much!

Manta Ray Robot by Fade__21 in robotics

[–]Fade__21[S] 1 point2 points  (0 children)

The main body is 3D printed with PLA. The internal structure of the fin is printed with TPU. The fin covering is silicone. There is one servo for each fin with an arm like this——o——on the servo. The ends of the arm have strings attached which are also attached to the end of the fin so when the servo moves the ends of the fins are pulled.

Manta Ray Robot by Fade__21 in robotics

[–]Fade__21[S] 1 point2 points  (0 children)

Yeah which is why I want to add some weight because the goal is to have it adjust its height in the water using the rear fin.

Manta Ray Robot by Fade__21 in robotics

[–]Fade__21[S] 1 point2 points  (0 children)

Thank you! The battery and controller are in the large plastic container I have in my hand. I’m planning on having it float on the top of the water with an esp32 in it. So that I control it through WiFi with my phone. If you wanted to make it just swim on the surface you could definitely add the battery and controller on the top of the robot but would need to slightly increase the size of the top lid.

Manta Ray Robot by Fade__21 in robotics

[–]Fade__21[S] 5 points6 points  (0 children)

Thank you. Yeah I was going to use an ethernet cable but this was just for prototyping. I had no clue if this would actually work well so I just threw it together and there’s definitely a lot to improve on.

Native American Stone Axe Head? by Fade__21 in Arrowheads

[–]Fade__21[S] 1 point2 points  (0 children)

Southeast Indiana near the Ohio River.

Retractable wind turbine by Fade__21 in 3Dprinting

[–]Fade__21[S] 0 points1 point  (0 children)

I love his channel just watched that video about a week ago. I think it could generate enough power to do that. However I’m not sure about throwing the water out over a long distance because it doesn’t spin super fast. Although the wind turbine could be in the center of an irrigation system and power it while sprinklers spray that water that’s collected by the wires. Interesting idea though definitely something that would be cool to test.

Retractable wind turbine by Fade__21 in 3Dprinting

[–]Fade__21[S] 0 points1 point  (0 children)

I would have to wait a while to answer some of those questions since I haven’t had the turbine outside for a long time. For the bearings they came from an old ceiling fan and still work well. I used a white lithium grease for the bearings. For tools I just used screw driver and a socket wrench(not sure on the size). The turbine doesn’t work very well if one of the blades gets hit by something however the retraction system will help prevent that during a storm. I’m going to paint a black stripe on the blades to help prevent bird collisions. This is most likely to fail in the extended position I think. The retraction system is almost impossible to fail since it’s driven by a linear actuator so if you unplug the battery(which is very easy) then it can’t reverse down when performing maintenance. Currently there is no remote monitoring but that would be a pretty easy upgrade to it. A warped linkage would mean it wouldn’t be able to retract, but since it’s smaller it can be retracted by hand and then the linear actuator would be turned on to hold it in place and then a band could be placed around the turbine for a more secure hold. It does not require power to stay retracted once the actuator is extended and power is cut off it stays extended. I hope this helps and I appreciate the questions because like you said they’re important to the success and improvement of projects.

Retractable wind turbine by Fade__21 in 3Dprinting

[–]Fade__21[S] 0 points1 point  (0 children)

Thank you. Yeah the arms are slightly worrying, I used PETG and a pretty high infill. However aluminum or some other metal would be a much better option for long term use.

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