the swirler-stein

[hmott]

<a href=showthread.php?s=&postid=7082271#post7082271 target=_blank>Originally posted</a> by rick17
could somebody take pics of the mounting proces i still can't figure out the arm that the mj is mounted on how you get the arm to stay in the hole and that it can turn sorry for my stupidity

the arm that the mj mounts to has a cam connected to it. Mine is glued, its why I have a 1/2 circle when only a small piece is needed, for more glue surfice. Here is a picture of all the pieces taken apart. If its not taken apart in this picture its glued where you see it (except the bolts and the rc car tire-rod I linked to on this page). The larger acrylic piece on the right WILL be glued in, its for the motor mount. I will glue it into the gray pvc housing and the motor will bolted under it. I'm using screws now because I didn't have a correct size bolt for testing. But I will get correct size bolts before I glue it on. I think I'm also going to add a piece of acrylic under it on the sides for support.

here is a much clearer picture of the top view with everything put together.

 

[rick17]

thanks now i get it

 

[hahnmeister]

The double wheel version benefits the most from having two near identical sized wheels to rotate, with the one on the motor being ever so slightly smaller. I just notice that the degree of movement on that box of yours might not be so great hmott...60 degrees maybe? You can get up to 120degrees. If you are interested...

 

[hmott]

No its more like 35*.. I'm interested. Tell me how to get 120. The whole 3 axis thing has my mind in knots and I can't even being to think how to make it have a larger arc.

 

[Siklid]

<a href=showthread.php?s=&postid=6969196#post6969196 target=_blank>Originally posted</a> by Kenzy
I went ghetto and bent up a piece of coat hanger wire. My local hobby shop is relocating so its closed for this week, once it opens back up again I'm going to look into some of the control rods for R/C planes.

BTW: your "how it works" link gave me another idea for multiple pumps to run by one motor, I'm thinking of 3 Maxistreams along the back wall of my tank rotating all the time. Could be fun. :smokin:

now that would be cool to see done up

 

[hahnmeister]

Ok, Ill work on some diagrams today...or better yet, if I can get the motor mounted, I could have a working version.

For now, let me try to give you an idea about how to get 120. The closer the two wheels are in diameter to each other, the more that the pushrod will cause the one on the motor to make the one on the powerhead mount move. Now, they cant be the same, because then there is the possibility that the powerhead mount could go too far and do a 180...oops. So to prevent that, its disk needs to be just slightly larger...like 1.125" and the disk on the motor is 1". Now, with a pushrod mounted so that its length is parallel to the tangent of the two circles, and with these two circles mounted as close as possible to each other, the dick on the powerhead mount will rotate just under 120 degrees..like 119.


For the one that moves the powerhead on 2 axis...like a cone instead of back and forth, think of it this way... Look at a teeter totter, but with not only a hinge action, but a swivel as well. now, mount the motor (with a large rotating arm) to one end of the totter vertically...that would make the teeter totter move not only up and down, but left to right...making the other end not only move back and forth, but up and down as well in a cone.

It is possible because the motor is mounted vertical. When you mount the motor vertical, you can also do this...make a slot bracket on the teeter totter mod so that as the wheel moves back and forth, the arm that fits over it doesnt move up and down, but just left to right. With a big enough wheel on the motor, and just a swivel on the arm, the arm attached to the mount in the tank swings back and forth w/o going up and down, and with only one wheel.

 

[smells like fish]

Hey, what happened to all the guy who were making this?
Any updates?

 

[hmott]

I posted pictures of mine. I still need to make a second one, but I stopped posting as no one seems to care much about this project.

 

[shrimpman]

Hmott, please do not stop posting about this project. This is very cool, and I am getting ready to get into it myself. I will post pictures as I get further into it. Please Everyone, continue to give what you have on this. This is a great DIY.... Don't let it die.....:lol:

Don

 

[want2reef]

Hmott,

Keep it coming.

 

[RichConley]

i agree, keep it coming. Still waiting for supplies to come in.

 

[shrimpman]

Rich, which motor did you purchase? I would like to find a 1rpm, but the one that hmott is using seems to be fine for him? 1 second sweeps seem to be fast? Any thoughts? Thanks,:smokin:

Don

 

[hmott]

shrimpman I also posted a .75rpm motor that I also have (2 of actually). I haven't tried to work with them, but other than not having the x drive shaft it would be exactly the same. I ordered 2 of each (2.5rpm and .75rpm). I still plan on making all 4 of them, I wanted to make one with the easier x shaft before I attempted the .75rpm's smooth shaft.

someone mentioned they didn't think torque would be an issue. I purchased the 2.5rpm's because of the higher torque rating on them. But now that I have one built I have to agree, I don't think torque is going to be a problem. BUT I haven't built one yet with the lower torque rating yet (the .75rpm is lower torque I believe in the 20oz-in area). I'm confident it'll work though.

 

[shrimpman]

why do you think the smooth shaft will be harder to work with? I would think the smooth shaft would be easier to deal with over all. I am liking the idea of the slower rpm, JMHO though... Thanks....

:smokin:

 

[hmott]

Well because I don't know how to attach the arm to it. With the plastic x shaft I cut out an x in the acrylic. Then I drilled a small hole in the x shaft and put a pin in it. So it holds together nice.

I just don't know what to do with the solid metal shaft. You need to attach the rotating arm to it and that needs to be fixed. How will you do that? If I could figure that out I'd probably start working on that one, but I'm skeerded of that smooth metal shaft. I also think the shaft is too long so it will probably need cut down some, not a big deal but just one more think I didn't want to deal with on my first attempt. Give me some steps to get the arm attached and maybe I'll go get the parts tonight and post up progress tomorrow.

 

[shrimpman]

I will order 2 of the smooth shaft motors. I would round out your cam as usual, then drill out the the shaft hole to match the shaft ofcourse, then I would trim off the uneeded length of shaft, I would then rough up the shaft where it's final resting position will be, then slide the cam on (ofcourse this will be after you have derived the proper shape and length of the cam), and then use liquid super glue (not gel type, so it flows in and between the shaft and the cam), let it dry. That's my plan for that? What do you think? :smokin:

 

[hmott]

heck I don't know.. sounds like it should work. I was affraid the superglue won't hold well to the metal shaft. But I guess if you rough up the shaft really well it should hold fine.

I wish everyone would have revived this thread on friday, I would have played with it over the weekend instead of my mj mod.

 

[shrimpman]

we could try using a metric drill hole for the shaft, use one just under the actual shaft size. Then we could force fit the cam onto the shaft, could work nicely...

 

[hmott]

I still think someone who's better at mechanical things should do a dc version. I think it could be done cheap and be adjustable with a potentmeter. I wish I had somewhere local to just pick and choose gears and motors from, then I might give it a try. I just can't get my arms around the fact the motor might spin 20,000rpm and I need gearing to get it down to around 2-4 rpm. That think would rock though!

 

[Barto]

I also second (or third or...)to keep the thread alive. I have plenty of interest, just no time lately to work on this project. One more thing on the list, but the list stays the same size, finish one, add one.........
Great project, thanks!