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#76
01/07/2007, 04:34 PM
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So close and yet so far.......I'm riding along on this one with with great interest.....
Watching your video with the clear box definitely shows how simple the design is.....the only holdup so far is the voltage. This is a $150 dollar idea, not a $500 one. I guess when you own the market on it, you can charge 3X too much....... Have all the other DC motor pumps been checked out yet? |
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#77
01/07/2007, 05:26 PM
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#78
01/07/2007, 07:35 PM
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Still wouldn't work the wavebox has to be off so the water can back flow into it.
The maxi mod works the mod just needs to be refined. I can't really see any cheaper possible method of doing it without the maxi-mod. |
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#79
01/07/2007, 08:35 PM
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You can still build one with a Tunze pump and build your own variable controller for a couple hundred bucks cheaper than a Tunze wavebox. I think the key here is to make a better design to auto reverse a maximod instantly and quietly when it starts in reverse. I've been wondering if maybe a clutch style design would work, but I have no idea how to build one. I've also just started researching DC brushless motors, but haven't got very far in the search.
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#80
01/07/2007, 08:56 PM
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Wave Controller 6091
So why not buy this controller and make the wave box and use a tunze ??pump Still alot less money or is there something else need ! Also which tunze powerhead would be best ! If i did this ? Not to go from the maxjet mod but just geting ideas with price in my head
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Who needes fish in a fish tank when you got corals |
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#81
01/07/2007, 09:47 PM
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on rc gas cars there is a clutch that could be used with a bit of DIY.. most are made of composite or alluminum.. composite would probably be the best choice here but i guess we'd have to make sure it wasnt harmful to aquarium.. but then again would it work under water??
i think to make this mod most sucessful without stress on prop or pump is one that is not magnetic drive.. meaning it will start in the same direction every time.. i bet if we think a while we can come up with something that will be great. RC boats may be of a great help here but then again they may have no help at all.. here is my idea.. a standard dc motor (whatever size.. there are so many) then use either a 90 degree pinion type joint or put a sproket on the end and use plastic chain (may cause splashing and alot of stress on chain though..) then run it down to a pro (probably any one would be good depending on motor) and have a 90 pinion assembly or a sprocket there then make a shroud similar to maxi mod but just the pvc pipe to help direct flow..  just an idea.. i think this will be a big hit once we get a more reliable one.. i love the idea of the wavebox but the price can be scary
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60% of the time it works every time |
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#82
01/08/2007, 12:01 AM
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too bad you cant use a one way bearing.
RC boats use a fex cable. I think most whould be safe for the aquarium. I know most of them use a stainless steel drive dog, as long as you use a plastic prop and dont make the bends too sharp, you should be able to make something like RSXS's sketch. however the box would most likely need to be much longer than your current one... either that or shorter. whatabout using a magnet attached to the motor outside the glass then a propeller attached to the propeller inside the tank?  otherwise you could just make a waterproof encasement for a DC motor and directly attach it
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I fear those without the power to chase their dreams, as they usually discourage others from dreaming. Last edited by cyslyde; 01/08/2007 at 12:31 AM. |
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#83
01/08/2007, 12:05 AM
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If you look at industry there are motors that are DC, they are servo motors they can spin either way and can switch quickly they are build for speed and durability. I think if someone could find one that was cheap enough and powerful enough to power a prop and isolate the shaft and motor from saltwater they would be a perfect fit for this application. If you have ever seen a CNC or similar machine you would know they are well suited for this application.
My brother does tool and die and he built a machine to stack car batteries on a pallet. They can stack 20-45/min. they are extremely fast, strong and accurate. the trick is getting a fitting to fit the shaft to islolated it. Put a key in the shaft and a drive dog on a plastic propeller and you are all set. Price is the only issue, I haven't been able to find one under $100.
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"Ring ring... Hello, this is your tank calling. I am all out of whack. Come fix me or I'll start shootin' your precious fish into the light fixtures!" |
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#84
01/08/2007, 12:20 AM
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This is one of those thoughts that goes back to that original DIY vortech thread...
Look at the brushless CDROM motors used in the rc aircraft world. Using one of those (slowfly winding works well - not sure if the 3d would work better?) a 20$ brushless esc, then it's a simple matter of finding a controller to tell the esc to ramp up/down as needed. Then a magnetic stirer to drive 'through' the glass aquarium wall / wavebox ala tsunami - into something similar to the buisness end of the stream mods (with a thrust bearing) Using a brushed RC motor is insane - buy one from your local hobby shop - hook it up to a battery... Don't know about you but that noise would drive me nuts. |
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#86
01/08/2007, 01:48 AM
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cyslyde, I think you're on to something. You just described making a Vortech. I know others have made DIY Vortechs i.e. liveforphysics, but I don't think anybody thought of using it in the wavebox.
smcnally, Great thread and videos! BTW quangtam7 has already come up with a way for the mj to spin the right way 100% of time without the noise or damage to the prop. quangtam7's mj mod His centering brace is across the bottom, preventing the magnet from ever popping up, so it can only spin in one direction. Here it is w/o the shroud. 
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Malama 'aina |
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#88
01/08/2007, 09:26 AM
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since the wavebox is for back and forth movement and not for circulation why not use displacement?
i made a box like the orginal poster and placed a plastic float inside. moving the float down forced water out of the box and moving the float up allowed water to enter the box. this was achieved with a servo motor. Last edited by ST33LR4T; 01/08/2007 at 09:38 AM. |
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#89
01/08/2007, 03:24 PM
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thanks for the info quangtam7. hope you dont mind if i pass it around.
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#90
01/08/2007, 03:59 PM
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st33lr idea is pretty good.. kind of like a piston in an engine except drawing water in and out.. could you achieve this fast enough to generate the wave motion we are looking for though??
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60% of the time it works every time |
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#91
01/08/2007, 05:06 PM
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#93
01/08/2007, 06:17 PM
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you could use a metal geared servo ( dont have to worry about stripping out) but alot of times theyre response speed isnt as fast... youd probably need some kind of controller but one that made the arm go up then when it reached the highest point to go down... this would have to move fairly quickly to be effective though and to get the timing right would be difficult
and i dont know that it would work as good as like one with a mj mod or tunze ...
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60% of the time it works every time |
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#94
01/08/2007, 06:29 PM
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Quote:
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60% of the time it works every time |
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#95
01/08/2007, 06:30 PM
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are you sure this works??? i can see that it holds the prop down but why does that mean that it starts in the right direction 100% of the time?? it could still spin in reverse but it wouldnt move up the shroud correct??? maybe im missing something..
i think this may help but i dont see where its a 100% work every time
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60% of the time it works every time |
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#98
01/08/2007, 07:45 PM
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looks to be a great design, just dont see how it makes it spin in one direction |
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#100
01/08/2007, 08:44 PM
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Since that mod, I have put a small piece of tubing on top part of the magnet to prevent wear and tear, the problem is it get stuck sometime, new solution is make one side farther from the hole on the base so it can only hit just one side instead of both.
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