[TC-10] Useless Box

[ludov]

13 hours ago, GroundskeeperWillie said:

[...a lot of explanation...]

I had to write it down with some truth tables, but it makes perfect sense now. I got stuck after adding dedicated switches and hadn't thought of using an additional valve to control the supply air to those switches. Genius!  I might borrow this for my box factory, if you don't mind (although, maybe I should focus on finishing it first, rather than thinking of enhancements ).

Thanks for the explanation; you have my vote!

[GroundskeeperWillie]

13 hours ago, Ludo Visser said:

I had to write it down with some truth tables, but it makes perfect sense now. I got stuck after adding dedicated switches and hadn't thought of using an additional valve to control the supply air to those switches. Genius!  I might borrow this for my box factory, if you don't mind (although, maybe I should focus on finishing it first, rather than thinking of enhancements ).

Thanks for the explanation; you have my vote!

Glad I could help. I also had a real hard time figuring out how to reason about pneumatic circuits and still do - but at least I got far enough to do what I needed. Feel free to use the idea, it's hardly mine anyway. I don't think @Mark Bellis has done this particular design, but make sure to browse his work at http://www.brickshelf.com/cgi-bin/gallery.cgi?f=141478. Some of it is massively complex and helped inspire me to keep looking for a "simple" solution to my concrete problem. Thanks Mark!

I hope you make your entry work. It could be the pneumatically most complex entry and a joy to watch

Edited October 25, 2016 by GroundskeeperWillie
Typo

[Brickthus]

On 25/10/2016 at 10:19 PM, GroundskeeperWillie said:

Glad I could help. I also had a real hard time figuring out how to reason about pneumatic circuits and still do - but at least I got far enough to do what I needed. Feel free to use the idea, it's hardly mine anyway. I don't think @Mark Bellis has done this particular design, but make sure to browse his work at http://www.brickshelf.com/cgi-bin/gallery.cgi?f=141478. Some of it is massively complex and helped inspire me to keep looking for a "simple" solution to my concrete problem. Thanks Mark!

I hope you make your entry work. It could be the pneumatically most complex entry and a joy to watch

Glad to inspire you!  About time more of us did more interesting pneumatic models.  Maybe one day TLG will revisit sequencers; it's been a long time since the refuse truck of 8868 in 1991.

According to the systems I have worked on, the way I can think of doing the sequence you need is two 2-function loops interacting.  The up/down and a dummy function are one loop and the in/out and another dummy function are the other loop.  Each loop does 3 of its 4 operations before enabling the other loop, so down, dummy, up or out, dummy, in.  Probably 4 cylinders and 6 switches minimum.

Perhaps if I had been reading here more regularly and not also building BB-8, which now works , I might have had a go but it's great to see you guys picking up on sequencers.  I'm glad to help anyone to learn more about it.  Most of what I knew about mechanical engineering until recently is what I learnt from LEGO building; LEGO, along with electronics kits and a bit of programming, made me an engineer.

BTW what is the source of buying just the pneumatics bag from 42043?  I could do with a few without so many of the other parts - only so many wheels needed for a truck that will fit in the house!  Thanks,

Mark

[GroundskeeperWillie]

I've added my entry to the entry topic.

The video is here:

 

[ludov]

I love it, it's great! I'd like to build one myself... Maybe my next project