Zerobricks Posted December 28, 2012 Posted December 28, 2012 So this is my idea of automatic pump and valve control. all goes down to the worm gear, which pushes the valve with an 8 tooth gear attached to it sideways depending of the motor's spinning direction. This LDD picture shows the idea And the video shows the real thing. IMO its very compact and efficient. Quote
DLuders Posted December 28, 2012 Posted December 28, 2012 (edited) @ Zblj: Very nice! Your LDD .lxf Building Instruction file is in your description -- "Download LDD file:http://www.brickshel...p/autompump.lxf ." Do you have plans for installing your Autopump in an existing MOC or set? Edited December 28, 2012 by DLuders Quote
Zerobricks Posted December 28, 2012 Author Posted December 28, 2012 @ Zblj: Very nice! Your LDD .lxf Building Instruction file is in your description -- "Download LDD file:http://www.brickshel...p/autompump.lxf ." Do you have plans for installing your Autopump in an existing MOC or set? Guess! Quote
Alasdair Ryan Posted December 28, 2012 Posted December 28, 2012 It's good a see more ideas for Pneumatics's. If you attach a controller and receiver can it do precise movement? Quote
Hopey Posted December 28, 2012 Posted December 28, 2012 This looks very useful. I'm planning an MOC for which I've got a spare IR channel, and might use this concept. Any particular reason for the gearing? It doesn't provide any reduction, and it seems you could make it smaller (though longer) if you just attached the motor directly to the shaft with the worm gear on it. You could certainly make it rather compact if built into some larger structure. Quote
Alasdair Ryan Posted December 28, 2012 Posted December 28, 2012 (edited) I doubt it. But he might make his own. This looks very useful. I'm planning an MOC for which I've got a spare IR channel, and might use this concept. Any particular reason for the gearing? It doesn't provide any reduction, and it seems you could make it smaller (though longer) if you just attached the motor directly to the shaft with the worm gear on it. You could certainly make it rather compact if built into some larger structure. The gearing also drives the pump which need to go at a certain speed for a good flow of air. Edited December 28, 2012 by Alasdair Ryan Quote
Hopey Posted December 28, 2012 Posted December 28, 2012 The gearing also drives the pump which need to go at a certain speed for a could flow of air. Right, but there's no reduction. 24T drives 24T, 16T drives 16T. So the result is 1:1; the compressor is driven at the output speed of the M motor. Quote
Alasdair Ryan Posted December 28, 2012 Posted December 28, 2012 (edited) Right, but there's no reduction. 24T drives 24T, 16T drives 16T. So the result is 1:1; the compressor is driven at the output speed of the M motor. And the 24t to the 16t? Edited December 28, 2012 by Alasdair Ryan Quote
Hopey Posted December 28, 2012 Posted December 28, 2012 And the 24t to the 16t? They're on the same axle. There's no place that two gears of different sizes mesh (not counting the worm gear 8T, which doesn't turn). All 3 axles turn at the same speed. The 16 and 24 tooth gears on the middle axle would have to be swapped (and the axle alignment changed appropriately) for there to be reduction. Quote
Alasdair Ryan Posted December 28, 2012 Posted December 28, 2012 Well in that case it's just for a drive shaft,lots of builders do it. Quote
Zerobricks Posted December 28, 2012 Author Posted December 28, 2012 Yeah the gears are just to make it more compact. Quote
bord4kop Posted December 29, 2012 Posted December 29, 2012 Nice one! Looks like it is working great! But do the worm gear and 8t gear keep ticking/grinding at full travel? I 've been looking for something like this.. I just made my own auto valve pump yesterday, like so: But it is not anywhere near as compact as yours. Quote
Zerobricks Posted December 29, 2012 Author Posted December 29, 2012 The worm keeps clicking, yes but its not same thing like gears skipping, because it doesnt skip but runs out of travel. Your version looks also good, but the clutch gear keeps slipping most of the time. Quote
bord4kop Posted December 30, 2012 Posted December 30, 2012 Yes, reminded my a little of your version, which is (very simple but) very well designed! @Zblj: Yap, true that. Mine is not ideal. I 've tried yours and it works excellent, I 'll take back my comment Quote
kevman Posted December 21, 2013 Posted December 21, 2013 I just built this for use in my rock crawler. I've tried several other ones that are out there and this by far is the best and most compact of them all. Many thanks for the idea! Quote
roineust Posted January 27, 2014 Posted January 27, 2014 Hello! I am looking for the most compact and lightweight LEGO pump structure, that can output at least 12PSI - no need for reverse action (no vacuum needed, only pressure), could you refer me to such a structure? Do you have any idea, what would be the weight of such a structure? How many pumps would be needed with such a structure, to reach 12PSI? Thanks! Quote
Tamas Juhasz Posted January 27, 2014 Posted January 27, 2014 (edited) 12 PSI is nothing. It's about 0,83 bar. So the little small pump (compressor) from the 8110 is far enough. This can be used until about 4 bars (atm). You can use Zblj's idea. (or mine: http://www.brickshel...y.cgi?i=6003101 - but it's not the best topic for this question, because it's a moc topic, and I don't want to advertise here other constructions) Edited January 27, 2014 by Mbmc Quote
Rockbrick Posted January 27, 2014 Posted January 27, 2014 (edited) I made this mod on my 8421 with a spare RC motor - man that thing pumps quick and well i'm sure it will hit 12psi but its limitations were the air slipping the seals on the pistons when I put some really heavy weights on the hook of the crane arm - I dont think you can combine this with an autopump switching/clutch slipping add-on without something burning up with the friction - it spins too fast. very light though. Edited January 28, 2014 by Rockbrick Quote
roineust Posted January 27, 2014 Posted January 27, 2014 (edited) Hey guys! This sounds fantastic! Where can i find an adapter and a gear system, that can enable me to connect a DC or RC motor/servo, instead of a LEGO engine, which is much heavier, e.g. relatively for my application? I have many small, continuous servos, that weigh much less than a LEGO engine and i can control their speed easily, they have torque of 300-1000 gr/cm, would they be too weak? Is there such a thing, a servo to LEGO adapter? I guess i could build one myself anyway... Since i have null experience with LEGO and no parts at all, could you tell me what would be the best way to find the exact parts i need for such a pump structure plan, without needing to pay X20 times more, for a box of a model, that i am even not sure has the right parts are inside? Mbmc, that structure looks very compact and interesting, why, though, can't i see the pump itself in the picture? Is it just the picture angle? Do you have a detailed plan? How can i acquire only the parts needed to build this plan? Is it possible to connect a simple small DC motor or servo, instead of a LEGO motor? Do you know the exact weight of this structure? Mbmc, one more thing - does this structure output continuous and stabble pressure, which actually, if i understand correctly, requires, at least 2 pumps? One compressing, when the other retracting? So much obliged! Edited January 27, 2014 by roineust Quote
Tamas Juhasz Posted January 27, 2014 Posted January 27, 2014 (edited) @Roineust: I will write a private message soon, because it's off in this moc topic. (it's about Zblj's construction) Edit1: You have so less posts that the messaging system isn't works to you (yet). So if you write an email adress, I can say more. Edited January 27, 2014 by Mbmc Quote
roineust Posted January 27, 2014 Posted January 27, 2014 Hello Mbmc! its roineust@post.tau.ac.il Thanks! Quote
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