Build a 15,000 rpm Tesla Turbine using hard drive platters
9 Steps
Here's a project that uses some of those dead hard drives you've got lying around.

In the Tesla Turbine, air, steam, oil, or any other fluid is injected at the edge of a series of smooth parallel disks. The fluid spirals inwards and is exhausted through ventilation ports near the center of the disks.

A regular blade turbine operates by transferring kinetic energy from the moving fluid to the turbine fan blades. In the Tesla Turbine, the kinetic energy transfer to the edges of the thin platters is very small. Instead, it uses the boundary layer effect, i.e. adhesion between the moving fluid and the rigid disk. This is the same effect that causes drag on airplanes.

To build a turbine like this, you need some dead hard drives, some stock material (aluminum, acrylic), a milling machine with a rotary table, and a lathe with a 4 jaw chuck.

Wikipedia has a good review article (http://en.wikipedia.org/wiki/Tesla_turbine), as well as articles about

Nikola Tesla http://en.wikipedia.org/wiki/Nikola_Tesla,
the boundary layer effect (http://en.wikipedia.org/wiki/Boundary_layer),
and Reynolds number (http://en.wikipedia.org/wiki/Reynolds_number)
(which determines if the fluid flow is laminar or turbulent).

I run my turbine on compressed air (40 psi), and it easily reaches speeds of 10-15,000 rpm. While the speed is high, the torque is low, and it can be stopped with your bare hand.

I have more details on my webpage (http://staff.washington.edu/sbtroy/turbine/turbine.html).
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## Step 1: Make ventilation holes in the platters

Step 1 should probably be to disassemble some hard drives but I assume that if you read Make, you've already figured out how to un-Make a hard drive.

The easiest way to make vent holes in the hard drive platters is with a milling machine and a rotary table. Center and clamp a stack of several platters to the rotary table and then you can cut any radially symmetric pattern fairly easily. Just be sure that you use aluminium platters because ceramic platters will shatter when you drill into them.

I made two sets of platters; one with a radial array of holes, and one with radial arcs. The platter with radial arcs in the picture was on the top of the stack and took the most damage. The platters beneath it have very little tear-out and look much better.
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maikel2 says: May 4, 2013. 3:46 AM
a conventional rotary compressor runs more than 100k rpm to develop vacuum to sucks outside air continuously thus compressed it.if this device run at that speed can it become a compressor???
bulsatar says: Feb 19, 2013. 7:48 PM
For those that don't like math but are still confused: notice that it is basically a closed system (rotationally) from the point of force (the air being blown in). The air circulates in the first platter set until the air pressure is too great and it escapes through the center holes of the platters (ignoring air escaping from the outside edges). This creates a pressure differential between the side of the hole being "pushed" on and the "back side" of the hole, inducing a spin. The pressure differential builds in the next platter layer and then moves out again, and again, and again until it escapes freely from the last platter set's center holes.
Because of energy loss from air escaping around the platters, friction from the bearings and other natural energy sinks, the inside platters exert more torque pressure than the outside ones (math stuffs go here for proof).
Good thing about this design is that you can use some "simple" thermodynamics to have a relatively low pressure, large area front condensed into a high pressure, small area front to get your air pressure from the wind for "free" (think of a properly tuned funnel) to drive an electrical generating motor thingy off of the axle with those new found magnetic thingies...
FlashSC says: Dec 8, 2009. 1:16 PM
I'd like to ask the silly question here, but, where does the pressed air comes out?
Maybe i missed something...

Thanks for the tuto.

.:FFH:.

Science4fun says: Dec 27, 2010. 11:04 AM
You're not!
This IS a stupidly designed device.
the air actually escapes thru the shaft hole.
CapmBattleship says: Jul 21, 2011. 12:59 PM
This is actually correctly designed, with the exhaust escaping through the shaft hole.

The Tesla turbine relies on the boundary layer effect and centrifugal force. The air gets forced to the center and out the shaft hole. An exhaust port on the side would ruin the design of the turbine.
jhardee says: Aug 5, 2012. 11:34 PM
no. CENTRIPETAL. not centrifugal. why does everybody think its centrifugal??
4lifenerdfighter says: Nov 2, 2012. 11:04 AM
Centrifugal doesn't even exist!
sockless says: Nov 10, 2012. 2:03 AM
Centrifugal does exist, it depends on your plane of reference. If your plane of reference is the object which has a centripetal force acting on it, there is a centrifugal force.
4lifenerdfighter says: Nov 14, 2012. 12:42 PM
Nope! :) Centrifugal is merely inertia perceived as a new force.
sockless says: Nov 15, 2012. 12:16 AM
It's all to do with plane of reference.
If you have a rotating plane of reference, you can have a centrifugal force. Look at the Wikipedia article for it.
4lifenerdfighter says: Nov 14, 2012. 12:42 PM
Nope! :) Centrifugal is merely inertia perceived as a new force.
FFX says: Sep 17, 2012. 6:07 PM
Make a good gearbox and put it to a generator which will charge the compressor ;)
4lifenerdfighter says: Nov 2, 2012. 11:05 AM
Law of conservation of energy prevents this. Gear backlash, for example? Air speed being lost to exhaust?
bart.p says: Jun 3, 2012. 11:21 PM
great project! have you ever done any test on how much vacuum this thing can generate? im currently designing a turbine that would pump air and have the shaft spun with an electric motor, one of my constrains is the intake size so i need to suck in as much air as possible and preferably compressed it as well
bart.p says: Jun 3, 2012. 11:22 PM
Moe_Tangna says: May 28, 2012. 12:40 AM
Hello!

Can the efficiency be improved by widening the Inlet Port? instead of just focusing on the blades in the center (does that mean the other disks arent getting airflow or something?) wouldnt that mean that more friction (even with the same amount of air) = More Power/Speed/Torque? Also, I cant understand where the exhaust ports are.

This is a great project!
But I cant do it. xD
(3rd world/ too young problems.)
den316a says: May 8, 2012. 8:38 AM
my Question is how much torck does this have can u run a generator off of it?
Techno Dude says: Apr 24, 2012. 11:38 PM
Hey I wanted to ask u that If u hook it up with a generator how much would it generate and its voltage pleas help
chungsan says: May 28, 2010. 9:43 PM
(removed by author or community request)
Pie Ninja says: Jun 8, 2010. 11:28 PM
There is no such thing as a free lunch.
KimberlyP says: Apr 25, 2011. 5:45 AM
I don't know about that. If you look at energy we are just fractioning it.
You just don't always get the choice of what you want for lunch :)

I'm a science person but there is a paradox which binds me to my religious brethren and sisters.

Which is more troubling a God which always was.

Or Infinity and or something created from nothing.

God would have to be infinite and spring from nothingness
&
Science can choose one or the other.
Pie Ninja says: Apr 25, 2011. 9:25 AM
I honestly have no idea what you just said.
nedesico says: Mar 12, 2012. 6:06 AM
I agree o.O
KimberlyP says: Apr 25, 2011. 2:03 PM
You said there is not such thing as a free lunch.

I'm saying there is always a free lunch, you just don't always get to choose what you are eating.

I was trying to be funny at first. (MY Geek humor sometimes does not translate well)

And then I got serious. In the end there are things we cannot know or comprehend. --- Paradox.
What created something out of nothingness?
If you are infinite then you have no creation or end.
aearly92 says: Jan 9, 2012. 9:01 PM
Makes complete sense to me, as long as you think of infinity with a positive and negative span. What kimberlyp is saying is that something infinite does not have a beggining... I personaly think infinity to be an endless forward reach that starts at a given point and then never stops so in my eyes the paradox isn't a paradox at all but I do respect the alternative view point. Thanks for making me think about it.
Can god create a rock larger than he can move? lol
KimberlyP says: Jan 10, 2012. 2:24 AM
Yes, well with causality we can pick a particular point and go forward on that point towards infinity.

But Causality is always a function of the state before that point in time.

Maybe its a circular function? Symmetrical on the macro scale, and non symmetric locally. IN which case we keep returning to 0 and all numbers are positive? We descend into a world of fractals. An infinite rabbit hole that keeps Excedrin selling well.

Something without a true beginning or end is as wacky as any religion!

Causality either maps to infinity or God or it breaks down and is no longer valid.

Causality needs time but if there is no change in time, ie: the universe is reduced to a single common state variable, then all we need is activation energy based on a density function of that state variable, which results in a second state variable.

Then you can map it all with a circular function and say everything is infinite and be satisfied. Except I would say why is there anything?

Science shows us how things work or can work, and philosophy and or religion tells us why?

So to rephrase: How is it that we can get something from nothing?
In the Universe I live in energy and matter are the same thing in different clothing. Practical physics deals with finite measurement. Mathematical abstractions do not have this limit.

Can god create a rock larger than he can move? lol

I would say no based on the 1st law of Thermo. It would be over unity!

Pie Ninja says: Apr 26, 2011. 12:50 AM
KimberlyP says: Apr 26, 2011. 6:39 AM
http://en.wikipedia.org/wiki/Kurt_G%C3%B6del

Godel The man who reduced the principia to ashes.
KimberlyP says: Apr 26, 2011. 6:04 AM
Causality is a paradox is the sense if you have a finite universe, then something must have created it. (It need not be God) The problem is that at some point you are down to where there was nothing before, and then how does something spring from nothingness?

If not you are dealing with infinity. With infinity nothing has ever been created or destroyed its just changing form?

Still infinity is a paradox for causality because its saying their is no beginning or end, just points between numbers.

Some things are unknowable, and non computable.

Whitehead in the Principia tried to save us but failed.
Schrodinger6 says: May 10, 2012. 1:12 PM
Something comes from nothing all the time, easy example is the spontaneous creation/destruction of particle and anti-particle pairs. That's why we have the PROVEN concept of vacuum energy. Also, why we can theoretically have the big bang springing out of nothingness and in this light we have no need for a god to exist...other than the "god-particle", kinda need that guy ha.
Pie Ninja says: Apr 26, 2011. 6:57 PM
I'm going to go over there now.
dombeef says: Jun 15, 2010. 7:06 AM
Or free pie...
Pie Ninja says: Jun 15, 2010. 7:42 AM
Oh, woe is me.
dombeef says: Jun 15, 2010. 6:37 PM
What did he say?
Pie Ninja says: Jun 15, 2010. 10:18 PM
dombeef says: Jun 16, 2010. 10:01 AM
Oh ok So he probably said that you could connect the end pipe to the opening pipe to get free power?
dombeef says: Jun 15, 2010. 6:37 PM
Yeah
thanatos370 says: Feb 19, 2012. 2:47 PM
If you were to attach a motor to the shaft of the turbine, would that turn it into a pump?
stephenfitton says: Feb 11, 2012. 2:13 AM
I wonder if you could do me a favor re your tesla turbine, I reached a quantum figure of 17 thou gap between blades (for compressd Air) for a more fluid-like force on the turbines to increase torque. is it possible for you to try this for me.any added expense will be paid by me,or if interested external micro adjustments for simplified cnc made from Corian-bench top and any threaded rod-(zero play acheived) by using human error factor.
RolyB says: Feb 7, 2012. 11:31 AM
Studying Tesla's Patent plans I see two things that are missing from recent constructs. These are items 26, Circular grooves and 27, Labyrinth packing.
Tesla must have included these for a purpose though he doesn't mention why.
The labyrinth looks like a seal.
I wonder are the grooves a sort of brake or governing mechanism, the fluid gets compressed in the grooves and thus slows the turbine down, perhaps?
I know it must be fun to see how fast the turbine can spin but the practical thing must be to turn that spin into power.
Any ideas on the grooves and labyrinth and why Tesla included them.
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