Tunze nano mod

[hammerswinger]

I just finished my reduction of the output shaft length and wow, Its like i have new pumps in there. My 26 bow has so much flow but it seems gentler. Not as much sand being kicked up but more coral movement. IN my 26 the pump is in the middle hitting the front glass and deflecting the water around both directions. It seems now the flow is more erratic then it was before to! And we owe it all to a high school kid!

 

[skydancer]

<a href=showthread.php?s=&postid=9404260#post9404260 target=_blank>Originally posted</a> by jacmyoung


BTW dhnguyen, I have a much better idea for adding a stopper in a modded 6025 but I will wait till Skydancer answers my call before spilling the beans

OK jacmyoung, I 'm not objecting to measure the flow on the Full Blast moded nanostream but...
As you know I own 4 6025s and are all moded to the first mod. (Only cut out the inside funnel). The flow is 1100gph+ per nano. I have an aquacontroller III pro turning the nanos on/off to create different flow patterns. I'm thinking if I go to the full blast mod, I'll never be able to start the 6025 spinning the right way. What say you? If the stopper will fix that then I'm going with the full blast mod and I'll measure the flow. I'm curious too you know.

By the way, did you buy the Dremel station at home depot?

 

[jacmyoung]

<a href=showthread.php?s=&postid=9406812#post9406812 target=_blank>Originally posted</a> by skydancer
OK jacmyoung, I 'm not objecting to measure the flow on the Full Blast moded nanostream but...
As you know I own 4 6025s and are all moded to the first mod. (Only cut out the inside funnel). The flow is 1100gph+ per nano. I have an aquacontroller III pro turning the nanos on/off to create different flow patterns. I'm thinking if I go to the full blast mod, I'll never be able to start the 6025 spinning the right way. What say you? If the stopper will fix that then I'm going with the full blast mod and I'll measure the flow. I'm curious too you know.

By the way, did you buy the Dremel station at home depot?

Point taken. I am pretty sure my stopper will work and you will not be disappointed, but give me a few days to actually have time to do it on one of my 6025s to be sure, I will then let everyone in on the full detail.

The workstation was at Lowes, fairly new product, not for serious machine work but good enough for our purposes.

 

[skydancer]

<a href=showthread.php?s=&postid=9404453#post9404453 target=_blank>Originally posted</a> by jacmyoung


Most nanos can self-correct without a stopper, some can not.

Now that you mention it... Out of my 4 6025, I have one that never (or almost never - it seems like) spins the right way. I don't know how to correct it... pretty frustrating...

 

[GSMguy]

<a href=showthread.php?s=&postid=9407517#post9407517 target=_blank>Originally posted</a> by skydancer
Now that you mention it... Out of my 4 6025, I have one that never (or almost never - it seems like) spins the right way. I don't know how to correct it... pretty frustrating...

send it to rodger

 

[skydancer]

<a href=showthread.php?s=&postid=9407798#post9407798 target=_blank>Originally posted</a> by GSMguy
send it to rodger

it's been modded...

 

[jacmyoung]

<a href=showthread.php?s=&postid=9407844#post9407844 target=_blank>Originally posted</a> by skydancer
it's been modded...

Don't you worry, I am pretty sure my mod will cure your 6025, I just need to find the time to do the mod.

 

[dhnguyen]

Roger cannot guarantee that the 6025 will start the correct way every time. It is in the nature of AC motors that they can spin in both direction and often they do just that. There IS no way to correct the prop direction without a physical stopper. Trust me on this guys. I have done this enough on MJs and other pumps to know better.

 

[GSMguy]

<a href=showthread.php?s=&postid=9408982#post9408982 target=_blank>Originally posted</a> by dhnguyen
Roger cannot guarantee that the 6025 will start the correct way every time. It is in the nature of AC motors that they can spin in both direction and often they do just that. There IS no way to correct the prop direction without a physical stopper. Trust me on this guys. I have done this enough on MJs and other pumps to know better.

um why do mine switch direction after a couple seconds then?? they sometimes start backwards bu always correct

 

[skydancer]

<a href=showthread.php?s=&postid=9408278#post9408278 target=_blank>Originally posted</a> by jacmyoung
Don't you worry, I am pretty sure my mod will cure your 6025, I just need to find the time to do the mod.

the anticipation is killing me....

 

[jacmyoung]

<a href=showthread.php?s=&postid=9408982#post9408982 target=_blank>Originally posted</a> by dhnguyen
Roger cannot guarantee that the 6025 will start the correct way every time. It is in the nature of AC motors that they can spin in both direction and often they do just that. There IS no way to correct the prop direction without a physical stopper. Trust me on this guys. I have done this enough on MJs and other pumps to know better.

Let's use this term "self-correct" so we don't confuse ourselves. All Tunze stock nanostreams should self-correct at startup. The modded ones may have problem as I explained earlier.

I forgot to ask you this since you are an expert on this subject. How close should the stopper be to the prop at its resting position? Can the stopper be right next to the prop or should it be some ways from the prop so the prop is allowed to shoot out some before the stopping action?

 

[mr pink floyd]

im pretty sure the way they self correct is if it spins backwards, it shoots out of the magnet "tube" becasue the prop pulls it out by pushing water behind it. The outward force is not strong enough to break the force of the magnet holding it in place, so it drops back in, and water rushes through the prop and forward, the way it should spin, and this puts a slight rotation on the magnet, when it comes close enough to the center of the field, there is enough energy to pick up on the rotation and keep it spinning, this time in the right direction

 

[dhnguyen]

In order to do this effectively the shroud will need to be much longer than that. The current nano shroud isn't long enough to allow the magnet to move forward to completely break the magnetic field. This is why we don't see as many of the same sort of issue with reverse spinning on the Hydor because their shroud is longer allowing more room for the magnet/prop to move forward.

jacmyoung: the stopper should allow enough room for the propeller to move forward ( I usually allow at least 1/8" if not 1/4" of free space for this)


GSMguy: IME Whether the "self correcting" feature will work or not depends on the tolerance in how the particular magnet and motor was built. No one motor or magnet is exactly the same as the next. And as such you will find some that are slightly weaker than others. This is true with all pumps.
Because of this fact, this "self correction" cannot work 100% of the time unless a physical stopper or brake is used. This is all from my experience and observation in modding other pumps and of course with no real scientific data to back.

 

[mr pink floyd]

Dh, either im confused, or you are, im guessing i am, but lemme try to explain a little better. The magnet should not break the field, it should go out as far as it is allowed before the force of the magnet pulls it back down. It wouldnt need to go out very far, just enough so that when it shoots back the prop is spinnign in the correct direction

 

[dhnguyen]

I didn't mean that the magnet should be completely separated from the motor body per se. But it should be allowed to move forward far enough so that the electro magnetic field from the motor coil can no longer spin it. Looking at the shorter nano shroud, I don't think this will happen reliably 100% of the time. There is just not enough room for the propeller to move forward as far as it needs to.

 

[mr pink floyd]

if you pull the prop out while the pump is on, youll see there is very little movement needed to make it not spin, maybe 1/2" or so?

its force of the water pushing on the prop that causes rotational energy when it shoots thew wrong way, and then again back in the water hits the prop, giving rotational energy in the other direction/

 

[dhnguyen]

I understand that it's the force of the backward water from the propeller spinning the wrong way (pulling in water) that pushed the magnet outward---Lets call it lift if you will. But it is the magnetic strength and force of the motor and magnet that will pull the magnet back in.

If I had a dollar for every time I have to tell people to use a stopper on the MJ mod to make spin correctly every time I would be very rich right now The same applies here. The nano motors are also AC as is the MJ motor. Also there is no other reason why there is that wedge on the 6045 crossbar other than to use as a stopper of sorts.

 

[GSMguy]

<a href=showthread.php?s=&postid=9411033#post9411033 target=_blank>Originally posted</a> by dhnguyen
I understand that it's the force of the backward water from the propeller spinning the wrong way (pulling in water) that pushed the magnet outward---Lets call it lift if you will. But it is the magnetic strength and force of the motor and magnet that will pull the magnet back in.

If I had a dollar for every time I have to tell people to use a stopper on the MJ mod to make spin correctly every time I would be very rich right now The same applies here. The nano motors are also AC as is the MJ motor. Also there is no other reason why there is that wedge on the 6045 crossbar other than to use as a stopper of sorts.

the nano streams really are similar to the mj mods just a different shape

 

[mr pink floyd]

haha DH, thats exactly what i said, or tried to at least. My brain must work differently from yours

 

[jacmyoung]

Alright, I have done the stopper mod tonight, took me an hour, was very careful with each step. I had to squeeze this work in tonight because I understood Skydancer's face was turning blue And this thing works like a charm.

Picture #1

Picture #2

Picture #3

Picture #4

Picture #5

Picture #6

Here is where the story goes:

A week ago I was staring at the scrap nozzle cutoff (Picture #1) after my wide flow mod, the light bulb came on, you know the kind of bulb Mr. Pink Floyd had, only that his was a rapid start, mine had to flick a few times.

But I wasn't so sure of the long term prospect of this mod since it was unlike any thing I read before in the MJ mod threads, that was until two days ago I saw a picture posted by atvdave on this thread of the inside of the 6045 nozzle/stopper. I realized Tunze had used the same trick so I was sure right there it was tested and would work long term.

Tonight I started by turning the 6025 cross bar cutoff into, well a cross bar, retaining the full length of the bars (Picture #2), including the added length by the rim, I then cut a notch on the tip of each bar, smoothed out the edges, then made four little matching cuts on the rim of the nozzle, pressed the cross bar into the nozzle, then used the workstation as a drill press routed out the center of the cross bar a little (Pictures #3 and #4) so when the prop shoots out, the prop center point will not hit the stopper rather the blades will, and therefore stop the prop from spinning.

The reason for the notch on the tip of each bar is so the matching cut on the nozzle could be short, once the fish screen cap is on they will be invisible (Picture #5)

Picture #6 shows the 6025 fully assembled after the stopper mod.

Most of the time was spent looking at my plans and taking it slow, making good and snug fit for each joint, and it paid off, I did not make any mistakes I feared might happen in a rush.

I am going to put this pump in my tank tomorrow and set it on a wavemaker with a one-minute on/off cycle, let it go for a few days to check wear and tear.

The best part of this mod is it is removable! If you don't need it just pop it out, put the screen cap back on, no one will be able to tell. The reason I want stress the removable part is that I actually found a great use for the reverse flow. Once every few days I would intentionally switch the pump off and on let it run in reverse for a few, then switch it back to the correct flow. I had a name for it, it's called auto cleaning mode It blows off all the junk accumulated on the ball so I do not have to take the pump out of the tank to clean that often.

Of course with the stopper installed, the auto cleaning mode is disabled. But how cool is that when you can actually choose which option to use.

Now Skydancer take a deep breadth and get on with your assignment