Some newbie advice?

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Some newbie advice?

Post  daniele tn on Thu Oct 14, 2010 1:03 pm

Hello, I'm currently building a laminar jet nozzle and I thought it would be wise to post my project here to show it to you and get some help.
I FOUND (for free obviusly) a 250 mm (10 inches?) wide pipe and 2 meters long (6 feet).
I have some problems with tools because I only have the basic ones and it is hard for me to find them.
I managed to cut my pipe down to 85 cm, and have some plexiglass plate (5mm) cut to size.
I will be using 2 plates on to and 2 on the bottom, but I have some questions:
Can I drill out my nozzle from the plexiglass it self using a column drill? Or do I relly need a bronz nozzle? If yes, can I drill it out using the same column drill? I have read of the "split ring" tecnique to hold the mesh inside the pipe, but for me it really is difficult to have my pipe cut out, do you have an idea of something else I could use instead?
And about the inside, in which type of shops can you find the filers? And how do you cut all the straws in a decent way?
Thank you very much

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Re: Some newbie advice?

Post  John on Tue Oct 19, 2010 12:22 pm

Sorry for the late response.

Yes you can drill out the plate to get your exit orifice, but it may not be the best cutting edge. What you need is a nice sharp edge (like a countersink hole) and as little material on that edge so that the water doesn't touch it. If you can do that with your material and drill press then great. Metals will hold a sharper edge better, and longer.

I did try using a whole bunch of straws with nothing holding them in but just a compresive force, but I just had mixed results. Sometimes the straws would hold and sometimes they would slip. If you want to be able to count on your nozzle all the time I would suggest using some sort of physical device to hold them into place.

One thing to note is that if you aren't going to shoot this very far then the forces aren't going to be that big and you can get away without constraining the layers.

The filters just need to be something that will diffuse the water. You can use many different materials. Maybe even some sort of cloth. Without knowing where you are from it is difficult to know what materials are available to you. I would look at sponges, plastic cleaning supplies, cloths, weed barrier (that's what I use).


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Re: Some newbie advice?

Post  daniele tn on Wed Oct 27, 2010 1:09 pm

Thank you John, and sorry for my late answer, but I was on vacation without internet connection.
I think I am going to use a metal mesh, the one you use againt mosquitos on the door. I'm going to hold it in place using a plastic stripe, bended to fit into the pipe.
I actually live in Belgium and in aquarium stores I couldn't find filters big enough, so I am looking for any possibility right now.
This afternoon I drilled a small hole in the plexiglass, and I don't like it very much, it's quite sharp but not clean.
Where do you think I could find something to make my nozzle out of?
Thank you

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Re: Some newbie advice?

Post  John on Wed Oct 27, 2010 8:54 pm

I sell some brass ones, but if you don't want to go for that you can try a metal washer. I'll think some more and see what I can come up with.
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Re: Some newbie advice?

Post  daniele tn on Thu Oct 28, 2010 9:50 am

Thank you,
what is the inside diameter of the nozzles you sell?

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Re: Some newbie advice?

Post  John on Thu Oct 28, 2010 10:07 am

.5 inches
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