Water vortex display from SJ City Hall exhibition -- repair and upgrade--- make money online

I built this project a few years ago with a friend to help get him interested in mechanical design.  Later, the project was adapted for display at a "tech and art" exhibition at San Jose City Hall.  After 8 months, the painted steel impeller began to rust and discolor the water in the tube.  I took the device back to my shop and replaced the original aluminum shaft with a stainless steel shaft, replaced the shaft seal, and changed the impeller to an all-plastic design.  If I were

designing the device again, I would opt for a spring-loaded PTFE (Teflon) shaft seal, which I have used with great success in other applications.

hey guys a little bit of a follow up to

a video I made long ago this is a

project that I built for San Jose City

Hall

it's sort of an art exhibit this tube is

filled with water and there's impeller

at the bottom really just a muffin fan

that I kind of stole the blades from and

this drill motor down here spins the fan

around creates like a water vortex in

this tube which looks pretty neat and

the whole thing is controlled from a web

server that you can access wirelessly

from you know a phone or in that book or

whatever so recently this thing came

back to my shop for a service the water

first grew algae which I was able to fix

just by emptying the water and putting

into a new bunch of water in there but

then it became obvious that the real

problem was rust here's a look at the

bottom of the device and this is the old

shaft with the old impeller on it this

is actually made of steel of course

because you can see it's rusting away

and when I originally built this project

it was to help a friend get interested

in mechanical design so I was really

only thinking it was going to live for

you know oh you're a couple months or

something but anyway and then this sort

of art project got started with San Jose

City Hall and so I wanted to adapt this

and make it a little bit built to last

longer so what I did is change the shaft

from aluminum to stainless steel and

also used a plastic impeller in there

instead of a steel one and then used all

stainless hardware inside inside the

tube so that the water only touches

plastic or stainless steel the bearings

are arranged like this there's one

thrust bearing up here a radial bearing

inside here another radial bearing here

and another thrust bearing here so with

these four bearings the shaft can only

rotate it can't move laterally or twist

laterally or move axially it can only

rotate and so this is the same kind of

configuration you'd want at the bottom

of a blender so you've got the shaft

pretty much rigidly fixed with a shaft

seal up here sealing the wall

into the tube so originally I used this

seal right here this is a oil shat an

oil seal for a shaft and it just has a

rubber a rubber seal with a spring to

hold some pressure onto the rubber there

and this worked pretty well this was

installed for you know probably 2 or 3

years or something and it started to

corrode at the top but it's really not

as bad as it looks it's it's fairly

superficial and so I was going to try to

change this into a an all teflon seal

which I used on for some vacuum projects

and those worked really well but the the

hole that I already machined into the

plastic was kind of already set and I

couldn't change it very easily so I just

got another one of these and put some

silicone across the top to try to cover

up that exposed steel and then just

popped it in there so the silicone would

kind of squeeze out between this and the

acrylic I got all these parts from

McMaster com I think every single one of

them the bearings the shaft the fan I

guess I cut up a computer fan but even

the stainless Hardware the stainless

socket head screws all that came from

McMaster probably even the plastic to

alright looks like success I'll keep the

water in there for a few days just to

make sure that it's not seeping and then

return it to San Jose City Hall it's in

the lobby and anyone can come in and use

it as long as City Hall is open ok see

you later guys byeTop Paid Keyword :  earn cash online, google make money from home, earn money online without investment by clicking ads, free earn money website, online money making jobs, earn money online without investment by typing, online work for money, best online earning sites, make money online with google, online earning websites, money making websites, online earning websites for students, invest online and earn money, best online money making, online money income, view ads and earn money without investment, earn money online by clicking, online money income site, money earning sites, online earning sites, best website to earn money, free money earning sites, money earning websites, get money online, online earning tips, online earning without investment, earn money online without investment for students, earn money by clicking ads, earn money online without investment, online earn money website,