My Snapper Needle Wheel

[Bommi]

Thought I would share my needlewheel design. It is for a Sequence Snapper. I have arranged it in a fan style shape. Testing to be completed after the glue sets.

 

[Bommi]

Hmm. Can't get the photos to show. Let me try again.

 

[Covey]

Yahoo Photo won't "share" its picture no matter how you type it in. They want you to go to the site.

As far as the needlewheel great start. Any reason you left the open spaces in it?

What are your plans for this pump?

 

[Bommi]

Without "needles"

With Needles

 

[Bommi]

Thanks. I guess I was to lazy to drill holes everywhere so I went with the fan shape.

 

[Andrew]

Looks nice!

 

[shadofax69]

Interested to see how this design turns out. Are the needles made of acrylic as well?

 

[spuzio]

how do you attach it to the pump?

 

[Bommi]

Shadofax69,
Yes, the needles are made out of acrylic. I don't know how strong they will be though, considering the wheel is spinning at a few thousand rpms.

Spuzio,
The center hole in the middle is threaded to fit the pump. With direct drive pumps, all you gotta do is screw it on.

-Dil

 

[badpacket]

If they break, you could try lexan/polycarb. Much stronger.

 

[Adam]

Bommi,

Looks nice. As a follow up to the "how does it attach" question, I am curious how you will incorporate the shaft seal. Doesn't the seal have to seat into the impeller?

I have a piece of 12" diameter acrylic tube that is destined to become a skimmer, so I am looking forward to seeing your design in action.

Adam

 

[gobygoby]

compared to the other DIY NW sequence pumps on this board your needles are much thinner then the others....I would be interested to know if any of your break

 

[RichConley]

<a href=showthread.php?s=&postid=7689545#post7689545 target=_blank>Originally posted</a> by gobygoby
compared to the other DIY NW sequence pumps on this board your needles are much thinner then the others....I would be interested to know if any of your break

The dart only spins at like 1700 rpm (maxijet does 1800). Most pressure rated pumps spin at 3600rpm.

I dont think heavy NW are that neccessary. That being said, I Havent tried it, so I dotn know.

 

[gobygoby]

I am talking about the needles, not the wheel itself. only reason I mention it is because on some of the others first proto types with thicker needles they either broke or came out of the socket.

 

[smjtkj]

If you look at the back of the factory impeller there is a round pocket for the bearing cup to sit in. This holds the ceramic seal as well. It will be very important to duplicate this. It won't be easy without a cnc but it can be done with a circle jig. I am looking forward to seeing how you overcome this challenge.
Mike

 

[mikevet]

i give up...what is a snapper needle wheel do/for?

 

[shadofax69]

It is a new sequence pump that they are moding for a needle wheel protein skimmer. It is to use a single pump for a large capacity skimmer instead of a bunch of small ones.

 

[Donw]

<a href=showthread.php?s=&postid=7688806#post7688806 target=_blank>Originally posted</a> by badpacket
If they break, you could try lexan/polycarb. Much stronger.

If you find them falling apart. You can get straight titanium bike spokes with a flat head. Counter sink them in the acrylic, back fill with weldon then cover the back with 1/8 acrylic. Worked great in a mag36 I did.

Don

 

[spuzio]

What size tap did you use for the center hole?

 

[Bommi]

I will probably have time to try it out this weekend. The center hole is 5/16" fine thread. I'm not 100% sure this is the right diameter, but it seems to fit.

Donw,
I will definitely look into the titanium bike spokes. What Weld-on did you use for bonding titanium to acrylic? Weld-on 16?

SMjtkj,
I am planning to just use 2 rubber washers and a rigid nylon washer on the shaft seal. For the front, I am going to have to think of some sort of cone-thingy like BillWann has on his, although I have no idea how to make something like that out of acrylic.

Peace,
-Dil