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Controlling the polar coordinates of an object 1
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- Опубліковано 28 бер 2022
- Point A of the pink object (a slider) is determined by the distance r from a fixed point
O and the angle φ from a fixed direction Ox.
The orange motor controls the distance r.
The violet motor controls the angle φ.
The pink slider has red pin that moves in an Archimedean groove of the green cam.
Blue line in the last scene of the video is the trajectory of point A.
Cons: orange motor is not grounded.
STEP files of this video:
www.mediafire....
Inventor files of this video:
www.mediafire....
This could make a cool Sisyphus table mechanism
You might be able to use one motor for both degrees of freedom, I believe I have seen this in your videos before. Put an idler gear on a link that is always in mesh with the motor, but can be moved to mesh with either output. But, I don't know how you would drive each degree of freedom in reverse.
Impressive, but couldn't you coil the spiral tighter and eliminate that gap, thereby increasing the "resolution" in the r axis?
Yes, higher resolution. Thank you.
Muito bom! Parabéns
Is there any chance you could explore a "soft opening" mechanism? I can't figure out how it would be made.
I first noticed it in a Pokemon Ball from Burger King (over 20 years ago) - link here: ua-cam.com/video/8Ov4cogKA3A/v-deo.html . It opens so slowly. I'm wondering how they did it. More recently, I saw a sloth hanger that has a similar feature, but it uses Silly Putty as a means of slowing down the opening - link here: ua-cam.com/video/Od7oWyg37pw/v-deo.html .
I'm guessing that the Pokemon Ball doesn't use any kind of putty - it doesn't seem like it would be a good means of manufacturing. Is there another way it could be done? Like some kind of air hydraulic? If you look at the first video, the person there shows several different Pokemon Balls that, maybe over the years, has lost it's "soft opening". If they are using a putty and it dried out, that might make sense, but then maybe it wouldn't even open.
Anyhow, I just want to know how a "soft opening" mechanism could be made and you seem to really know mechanics. I hope you decide to take on the challenge.
Possibly the Pokemon Ball and Soft-close toilet seat hinges use the same principle to slow down the movement.
Unfortunately, I still don't know how it works.
@@thang010146 ah, according to this video, it uses some kind low viscous product. ua-cam.com/video/hxgTikF1nlY/v-deo.html
Thanks! I didn't think to look at soft close toilets.
Rotary dampeners
AJ Palermo.
Thank you. Rotary dampers.
mememe.
See how the rotary damper works:
www.toyoudamper.com/news/how-the-rotary-damper-works-40463522.html
Thanks to you both. I was hoping it was a different solution that didn't involve a grease or fluid. I'm still so curious as to how it works on the Pokemon Ball. I can't imagine they had a sealed system, but maybe they do. I guess I'll never know.
Share files please. Thanks.
Links to download CAD files of this video have been added to the video description recently.
Telescope focuser