LegoGBC Posted March 8, 2015 Posted March 8, 2015 (edited) After months of building (well, life got in the way) I've finally finished building my biggest, most complex GBC module. It's a hybrid GBC (uses both mechanical and pneumatic functions) of a construction site-like-crane operation. Here's the video. A detailed description of how the crane works is written below The 6 step movement of the crane is done without using any sort of programming and no mechanical timers - it uses 3 differentials (one heavy duty) to power 4 outputs: 1) The crane rotation 2) The crane's claw (a pneumatic switch) 3) The crane's boom (a pneumatic switch) 4) The PF switch used to reverse the motion The 6 step movement: 1) Close the claw 2) Lift 3) Rotate 4) Release 5) Rotate back to original position 6) Lower So how does it work? Differentials send the power to the 'easiest' output. So the first, easiest function is to close the claw (rotating an axle which then changes the position of a pneumatic switch) -to grab the crate The second easiest is to open the boom's pneumatic switch -to lift the crate After that, the crane rotates until it's blocked at it's final position (the drop position). The power is then sent to the PF switch, which reverses the movement: -The claw opens -The crane rotates -The boom lowers Notice how the boom lowers AFTER the crane rotates back to it's original position (while it lifts BEFORE the crane rotates) - this is done so the boom won't lower in the wrong position (where it drops the crate) - a rubber band mounted on the boom's switch makes sure this happens: -It's easier to change the switch to it's lift position than it's to rotate the crane -It's harder to change the switch to it's lower position than it's to rotate the crane back. There are many (really, many) more small mechanisms in this module, but I think it's better to see those in the video :) Thanks for watching! Edited March 8, 2015 by LegoGBC Quote
Zerobricks Posted March 8, 2015 Posted March 8, 2015 Such an epic model, video, presentation and IDEA! I love the construction site/factory setting with containers, conveyer belts, etc... Your nick is well deserved! Quote
Andy D Posted March 8, 2015 Posted March 8, 2015 I think epic really describes it! Very well done. Andy D Quote
ALittleSlow Posted March 8, 2015 Posted March 8, 2015 Impressive! I sure wouldn't mind a longer video to see more of those intricacies. Quote
DrJB Posted March 9, 2015 Posted March 9, 2015 (edited) This has got to be the second GBC (after Akiyuki's factory) where a container of balls gets moved across modules. Very nicely done! How do you even get started on a project like this? Paper and Pencil? Simulations/calculation of gear mechanisms? Also, I'm sure all the mechanisms are sunchronized/keyed and yet, in the video there is a lot happening and it's difficult to 'capture' such repetition/cycle. All in all, very nicely done. Oh, and the music is by ... Yanni? Edited March 9, 2015 by DrJB Quote
ALittleSlow Posted March 9, 2015 Posted March 9, 2015 This has got to be the second GBC (after Akiyuki's factory) where a container of balls gets moved across modules. V The predecessor to the GBC was SMART's Crate Contraption, and it was all about moving containers of balls. Quote
DrJB Posted March 9, 2015 Posted March 9, 2015 The predecessor to the GBC was SMART's Crate Contraption, and it was all about moving containers of balls. It seems you got the wrong link. Quote
dr_spock Posted March 9, 2015 Posted March 9, 2015 Cool. I would've prefered to hear the sound of the GBC working versus the music sound track in the video. The sounds of motors, gears, compressors...now that's real music. Quote
LegoGBC Posted March 9, 2015 Author Posted March 9, 2015 This has got to be the second GBC (after Akiyuki's factory) where a container of balls gets moved across modules. Very nicely done! How do you even get started on a project like this? Paper and Pencil? Simulations/calculation of gear mechanisms? Also, I'm sure all the mechanisms are sunchronized/keyed and yet, in the video there is a lot happening and it's difficult to 'capture' such repetition/cycle. All in all, very nicely done. Oh, and the music is by ... Yanni? I always start with the main mechanism I would like to check (in this case, the differentials for sequencing). Then I thought about the crane and developed the concept of how it would work (I thought about it in my head for a few days and solved the problems I could think of). Then I drew a quick sketch of the whole system (very basic, without any mechanism details, just squares with titles) and after finishing the crane (well, it's first version...there were many modifications later on) I've started working on the other mechanisms (unloading,loading and tracks) The music is "Epic Adventure" from AudioMicro.com Cool. I would've prefered to hear the sound of the GBC working versus the music sound track in the video. The sounds of motors, gears, compressors...now that's real music. Thanks. I do usually agree regarding the sound of GBCs, but I think that in this case the music sounds better than the squeaks of the knob gears Quote
ALittleSlow Posted March 9, 2015 Posted March 9, 2015 Steve's GBC web page linked to above days "This started as a 'Ping Pong ball handoff' within our club (The Lafayette LEGO Robotics Club or LafLRC), and was combined with SMART's Crate Contraption to become The Great Ball Contraption ." There is a link to the SMART contraption discussion on Steve's page. Quote
Graydingo Posted March 11, 2015 Posted March 11, 2015 The differential 'easiest' method is mind blowing. I'm going to have to watch this a few more times. Quote
LegoGBC Posted March 12, 2015 Author Posted March 12, 2015 The differential 'easiest' method is mind blowing. I'm going to have to watch this a few more times. Thank you! It is very handy since it doesn't rely on syncing complex gear ratios and therefore, does not 'drift' after running for long periods. Quote
victor_chio1725 Posted July 14, 2015 Posted July 14, 2015 After months of building (well, life got in the way) I've finally finished building my biggest, most complex GBC module. It's a hybrid GBC (uses both mechanical and pneumatic functions) of a construction site-like-crane operation. Here's the video. A detailed description of how the crane works is written below The 6 step movement of the crane is done without using any sort of programming and no mechanical timers - it uses 3 differentials (one heavy duty) to power 4 outputs: 1) The crane rotation 2) The crane's claw (a pneumatic switch) 3) The crane's boom (a pneumatic switch) 4) The PF switch used to reverse the motion The 6 step movement: 1) Close the claw 2) Lift 3) Rotate 4) Release 5) Rotate back to original position 6) Lower So how does it work? Differentials send the power to the 'easiest' output. So the first, easiest function is to close the claw (rotating an axle which then changes the position of a pneumatic switch) -to grab the crate The second easiest is to open the boom's pneumatic switch -to lift the crate After that, the crane rotates until it's blocked at it's final position (the drop position). The power is then sent to the PF switch, which reverses the movement: -The claw opens -The crane rotates -The boom lowers Notice how the boom lowers AFTER the crane rotates back to it's original position (while it lifts BEFORE the crane rotates) - this is done so the boom won't lower in the wrong position (where it drops the crate) - a rubber band mounted on the boom's switch makes sure this happens: -It's easier to change the switch to it's lift position than it's to rotate the crane -It's harder to change the switch to it's lower position than it's to rotate the crane back. There are many (really, many) more small mechanisms in this module, but I think it's better to see those in the video :) Thanks for watching! Very nice tried out. Congratulation. Do u have any instruction on ur GBC module ? i like to try it. Tq. Quote
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