I’m starting a new project. (Oh the Humanity!) A major component is this thing I’ll call a sprayer. See attached .PDF. Not shown are two bearings that hold the vertical pipe in position. Oops. As this device spins around, a fluid is pulled up the vertical pipe and “flung” both ways down the inside of the horizontal pipe. The fluid, now under pressure, exits the two small holes near the (capped) ends of the pipe.
I tried assembling something similar using threaded galvanized pipe from the hardware store. However, those fittings are way less than precision – the final thing is not straight, way out of balance, and I don’t dare spin it up above 800 rpm. (It needs to go at lease 3,000 rpm.)
So I came up with this idea that uses two hollow precision shafts and a block that holds them together. First thought is to press fit it together. Another idea is to use a split collar type arrangement. Either approach requires more precision than I can produce with the skills and tools available.
I welcome other ideas that will make it easier to build this “sprayer.” Let’s discuss at the next meeting!
Bring what you have to the next meeting and we can hash it out. The next meeting is at SeeMeCNC so if you need a custom part, maybe you can get one machined
Some things are meant to be closed. Your mind isn't one of them.
Post by jimustanguitar on Feb 5, 2014 9:13:03 GMT -5
Instead of using off the shelf threaded fittings, you could make it with slip joints that you hold straight in a jig and braze or solder together (like sweating pipes in plumbing).