Timeline for Ideas for mechanism for quick reciprocating motion - a 'truly' mechanical switch
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 29, 2021 at 9:41 | comment | added | Transistor | @OliverWalters, being abusive in language or tone will not help you at all on this site. People give freely of their time to help others and you should respect that. I'm flagging your previous comment for moderator attention as it is in breach of site rules and common decency. It has certainly put me off posting an answer. | |
| Aug 26, 2021 at 19:37 | comment | added | joojaa | @OliverWalters a fourbar cannot dwell, but depends on how you measure dwell as even the normal fast return does not really dwell. But obviously slows down at each end of the leg if its symmetrical. But the canonical choice for a dwelling move is a specialized cam called a scotch yoke. The symmetrical fourbar is similar but the scotch yoke can be modified so that it actually stops at the ends of movement. But designing a cam like scotch yoje is harder since you need to account for the jerk in the system. For similar reasons you wouldnt use a genneva wheel. | |
| Aug 26, 2021 at 19:11 | comment | added | Oliver Walters | @niels nielsen is it not the geneva mechanism which achieves this? I haven't seen a version which produces bidirectional back and forth movement though? I believe in a camera its unidirectional pulling each slide into place from a reel no? | |
| Aug 26, 2021 at 19:06 | comment | added | Oliver Walters | @joojaa Yes it needs to be able to dwell at each 1 or 0 state - I don't see how a mechanism which produced short sharp back and forth movements couldn't have a dwell time? Anyway, please post a link or some kind of illustration of how a fourbar could achieve this | |
| Aug 26, 2021 at 14:52 | comment | added | joojaa | @OliverWalters well consider that a quick rerurn fourbar mechanism is just a fourbar that is nonsymmetrical to give quick return. A symmetrical fourbar is just simply a forth an back just as quickly. But really i dont know if you want a dwell mechanism instead. | |
| Aug 26, 2021 at 14:34 | comment | added | Oliver Walters | @niels nielsen can you find an image or video of this mechanism? | |
| Aug 26, 2021 at 14:33 | comment | added | Oliver Walters | @joojaa if the answer to this question is so easy to you, why didn't you put down an answer???? | |
| Aug 26, 2021 at 2:43 | history | answered | niels nielsen | CC BY-SA 4.0 |