my diy needle wheel dart pump
- Thread starter spazz
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wakefreak33
New member
any updates?
wakefreak33
New member
anu updates?
jnarowe
New member
spazz has been busy lately so it may be a while. I am waiting to hear back on some design options so I thought maybe I would post the options and get feedback here. I am working with 3/8" acrylic sheet.
Option A is a classic neck and cup but a bit difficult to build. Option B is the easiest to build and combines the riser and the collection cup into one unit, and Option C is a modified option A that is slightly easier to build.
I am ineterested in feedback from people who understand skimmer design & construction and particularly opinions about whether Option B is a viable design. I think it might work well, but I am not sure about the abscence of the riser tube and the affect that would have on collecting skimmate.
Option A is a classic neck and cup but a bit difficult to build. Option B is the easiest to build and combines the riser and the collection cup into one unit, and Option C is a modified option A that is slightly easier to build.
I am ineterested in feedback from people who understand skimmer design & construction and particularly opinions about whether Option B is a viable design. I think it might work well, but I am not sure about the abscence of the riser tube and the affect that would have on collecting skimmate.
Bill Wann
In Memoriam
Hey Spazz
I machined the plate to mount the needles to , Looks likem t he back of th eimpeller . The mecanicak seal fits well . All i have to do is make the program to drill th eholes for the needles . I made mine 4.5 inches wide .now I have to machine out the housing for clearance but I think it should work better this way , less gap between th eimpeller an housing .
Let me know what you think .
I machined the plate to mount the needles to , Looks likem t he back of th eimpeller . The mecanicak seal fits well . All i have to do is make the program to drill th eholes for the needles . I made mine 4.5 inches wide .now I have to machine out the housing for clearance but I think it should work better this way , less gap between th eimpeller an housing .
Let me know what you think .
hahnmeister
In Memoriam
jnarowe, on the square skimmers that I make, I use a design similar to A. Its actually easy to do with a square sheet...and thermalforming rather than glueing. Then at the peak I attach a pipe for the neck. It works great.
jnarowe
New member
That's what I ended up doing. Check out the morerecent pages on my thread for a pic of it in progress. I may be able to finish the skimmer by the end of this week, and I'll post more pics then.
spazz
New member
<a href=showthread.php?s=&postid=7011545#post7011545 target=_blank>Originally posted</a> by Bill Wann
Hey Spazz
I machined the plate to mount the needles to , Looks likem t he back of th eimpeller . The mecanicak seal fits well . All i have to do is make the program to drill th eholes for the needles . I made mine 4.5 inches wide .now I have to machine out the housing for clearance but I think it should work better this way , less gap between th eimpeller an housing .
Let me know what you think .
hey bill i wouldnt go that big in diameter on the wheel. i went too big on the first one and the pump got too hot. it cant handle on oversized impellor on it. i would stick to the standard 3.75" wheel size or even go a little smaller on the diameter but add more pins to it.
what you can do is add in all the pins to the wheel and then if there is a problem with overheating then remove the outer set of pins from the wheel and mill it down smaller.
when you add the pins i wouls add more than what you see in my wheel to the center of the wheel. you have the cnc so it will be easy to program in more pins than that. i would space them about .375 apart on the inside and .5 apart on the outter 2 rings of pins. i also think you should just use 1 size pin for the wheel. i used 2 sizes and dont feel it did any good. if anything it just causes more drag on the motor. i feel smaller pins are better more effecient in the design.
spazz
New member
<a href=showthread.php?s=&postid=7011545#post7011545 target=_blank>Originally posted</a> by Bill Wann
Hey Spazz
I machined the plate to mount the needles to , Looks likem t he back of th eimpeller . The mecanicak seal fits well . All i have to do is make the program to drill th eholes for the needles . I made mine 4.5 inches wide .now I have to machine out the housing for clearance but I think it should work better this way , less gap between th eimpeller an housing .
Let me know what you think .
hey bill i wouldnt go that big in diameter on the wheel. i went too big on the first one and the pump got too hot. it cant handle an oversized impellor on it. i would stick to the standard 3.75" wheel size or even go a little smaller on the diameter but add more pins to it.
what you can do is add in all the pins to the wheel and then if there is a problem with overheating, then remove the outer set of pins from the wheel and mill it down smaller.
when you add the pins i would add more than what you see in my wheel to the center of the wheel. you have the cnc so it will be easy to program in more pins than that. i would space them about .375 apart on the inside and .5 apart on the outter 2 rings of pins. i also think you should just use 1 size pin for the wheel. i used 2 sizes and dont feel it did any good. if anything it just causes more drag on the motor. i feel smaller pins are better more effecient in the design.
keep up the good work bill and post pics of it as your going. i will be working on the one going to florida real soon and will be posting pics of that one as im making it. its going on the sequence 1000 series 3200 pump.
Bill Wann
In Memoriam
Hey spazz
Thats weird ,everything you said is how Ive done it so far except the diameter . All teh pin spacing and the pin size is right .
Any pick of your for the 1000 pump ? Would you be able to make a 20 inch cone ? Not sure if you have a mold yet ?I figure on my 25 ich od tube I will use two darts , Think that will work ok ?
Bill
Thats weird ,everything you said is how Ive done it so far except the diameter . All teh pin spacing and the pin size is right .
Any pick of your for the 1000 pump ? Would you be able to make a 20 inch cone ? Not sure if you have a mold yet ?I figure on my 25 ich od tube I will use two darts , Think that will work ok ?
Bill
spazz
New member
he bill brilliant minds think alike. ha ha ha ha the 1000 series is all he had with the baddor motor so im going to try and convert tha pump because i think you can still get those pumps with the baldor motor on them from sequence. also this motor is 1/8 hp and seems to be alot bigger armature in it so it should have some extra torque in there for the larger diam needle wheels.
as for the 20" tube you will need a big tube (4 ft+) for 2 of these pumps to be put on there. i think you can use one size larger air pump on the dart and still not over drive it with air. i have not tested that part yet because im concentrating on other stuff right now. but when i get the needle wheel sent to florida that theroy will be tested. that guy has the larger air pump already so we can get that information with out spending $350 on an air pump.
i think you can get up wards of 350 cfh to the skimmer with 2 darts and 2 larger sweetwater pumps. and then still be around 500 watts with all those pumps running.
as for the 20" tube you will need a big tube (4 ft+) for 2 of these pumps to be put on there. i think you can use one size larger air pump on the dart and still not over drive it with air. i have not tested that part yet because im concentrating on other stuff right now. but when i get the needle wheel sent to florida that theroy will be tested. that guy has the larger air pump already so we can get that information with out spending $350 on an air pump.
i think you can get up wards of 350 cfh to the skimmer with 2 darts and 2 larger sweetwater pumps. and then still be around 500 watts with all those pumps running.
Bill Wann
In Memoriam
Ive been looking at some pics of RD needlewheels and saw they have a con in th emiddle to help direct water flow , So i thout I would give it a shot . Came out pretty go for my frist attempt .
The tube I have is 4 feet tall and 25 inchs wide , I figure I will put a difuser plate in teh bottom and have the darts blow into that . Should work pretty good . I hope . IAm waiting on an 1/8 end mill to make th eholes in the plate , should have it done tommarow .
The tube I have is 4 feet tall and 25 inchs wide , I figure I will put a difuser plate in teh bottom and have the darts blow into that . Should work pretty good . I hope . IAm waiting on an 1/8 end mill to make th eholes in the plate , should have it done tommarow .
Roland Jacques
Premium Member
where can i see pictures of RD wheels?
Roland
Roland
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