DraikNova Posted March 31, 2016 Posted March 31, 2016 I've been trying without success to figure out how to make a compact mechanism that translates normal rotation into back-forth rotation. Any thoughts on how to accomplish such a thing? Quote
BusterHaus Posted March 31, 2016 Posted March 31, 2016 Use a 2L beam for rotation, or the cam piece if your linear mechanism is vertical. It doesn't get smaller than that. Quote
dr_spock Posted March 31, 2016 Posted March 31, 2016 Day 111 of 365: Whack a Jar Jar Binks by dr_spock_888, on Flickr Quote
Lego2016Lego Posted March 31, 2016 Posted March 31, 2016 Topic: http://www.eurobricks.com/forum/index.php?showtopic=108493&hl=%2Bwhack+%2Bbinks Quote
DraikNova Posted March 31, 2016 Author Posted March 31, 2016 The thing is, I'm trying to get a back-and-forth rotation, not a back and forth linear motion. Quote
wumsi Posted March 31, 2016 Posted March 31, 2016 (edited) you could push a worm gear around with the contraption that BusterHaus posted and let that drive a gear Edited March 31, 2016 by wumsi Quote
roppie11 Posted March 31, 2016 Posted March 31, 2016 (edited) i made a small mechanism for you. it's not that difficult as you may think you can see everything on the image i think. 2 thin lift arms 3L and 2 thin liftarms 4L. use 2 axles 3L and tadaa ;) Edited March 31, 2016 by roppie11 Quote
agrof Posted March 31, 2016 Posted March 31, 2016 (edited) Do You have size, part, design limitations? Do You want an electrical or a mechanical or a combined solution? How many rotation should be the switch period (1/2 - 1 - 10-...)? There is couple open questions, but I believe this can be solved in various way. Here is my 2 cents, didn't try, but there is a serious problem with it: it will stop, as the PF switch reaches the Zero point first. Maybe with enough angular momentum... Note: the lime pulley wheel is the output, the small assembly represents the switch, and the motor is driven by the switch. Sorry for not showing a proper working solution, but maybe generates some idea. Edited March 31, 2016 by agrof Quote
BusterHaus Posted March 31, 2016 Posted March 31, 2016 Linear solution, you can also replace the 4L connector with a 3L connector: Quote
DraikNova Posted March 31, 2016 Author Posted March 31, 2016 -snip- i made a small mechanism for you. it's not that difficult as you may think you can see everything on the image i think. 2 thin lift arms 3L and 2 thin liftarms 4L. use 2 axles 3L and tadaa ;) Wow. This is an absolutely perfect solution to my problem. Thanks for the help everyone! Quote
roppie11 Posted March 31, 2016 Posted March 31, 2016 i have also a short video. filmed with my mobile phone. but i don't know how to share it here. if i copy the link that i see, you probably have to log in to my account to see it. if you know what i mean. nevermind. it should be pretty clear. Quote
Lego2016Lego Posted March 31, 2016 Posted March 31, 2016 Look at http://www.eurobricks.com/forum/index.php?showtopic=71241#entry1320172 Quote
roppie11 Posted March 31, 2016 Posted March 31, 2016 it only mentions youtube video's. But its alright. the photo shows enough. Quote
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