how to build a tesla coil.doc

7/28/2019 How to build a Tesla Coil.doc

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How to build a Tesla Coil

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Author: DevCoder(My Hompage)Devin is a cool guy, eh doesnt kill himself while doing stupid things, and doesnt afraid ofanything.
http://www.instructables.com/member/DevCoder/http://devin.gotdns.com/http://www.instructables.com/member/DevCoder/http://www.instructables.com/id/How-to-build-a-Tesla-Coil/?ALLSTEPS#step8http://www.instructables.com/id/How-to-build-a-Tesla-Coil/?ALLSTEPS#step7http://www.instructables.com/id/How-to-build-a-Tesla-Coil/?ALLSTEPS#step6http://www.instructables.com/id/How-to-build-a-Tesla-Coil/?ALLSTEPS#step5http://www.instructables.com/id/How-to-build-a-Tesla-Coil/?ALLSTEPS#step4http://www.instructables.com/id/How-to-build-a-Tesla-Coil/?ALLSTEPS#step3http://www.instructables.com/id/How-to-build-a-Tesla-Coil/?ALLSTEPS#step2http://www.instructables.com/id/How-to-build-a-Tesla-Coil/?ALLSTEPS#step1http://www.instructables.com/id/How-to-build-a-Tesla-Coil/?ALLSTEPS#step0http://www.instructables.com/id/How-to-build-a-Tesla-Coil/?ALLSTEPShttp://devin.gotdns.com/http://www.instructables.com/member/DevCoder/


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iThis Instructable will walk you through building a medium sized Tesla coil.

Step 1DANGER

i

Unlike some other high voltage experiments, a Tesla coil's streamers can be very harmful. If youare shocked by the streamers, you will notfeel pain, but your circulatory and nervous system cansustain severe damage. DO NOT TOUCH IT WHILE ON UNDER ANYCIRCUMSTANCES.

Also, I don't take any responsibility for you hurting yourself.

This isn't to say that you shouldn't get into high voltage though, its just that if you are planning
http://www.instructables.com/file/FS6P585FVS7L8WI/http://www.instructables.com/id/How-to-build-a-Tesla-Coil/step1/DANGER/http://www.instructables.com/file/FCLH54SFQMXFD17/http://www.instructables.com/file/FS6P585FVS7L8WI/http://www.instructables.com/id/How-to-build-a-Tesla-Coil/step1/DANGER/http://www.instructables.com/file/FCLH54SFQMXFD17/


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for this to be your first HV project, its a little to involved. Instead, try out a nicemicrowave oventransformer, and be safe!

Step 2Gather the Materials

i
http://www.instructables.com/id/Microwave_Oven_Transformer_High_Voltage_Rig/http://www.instructables.com/id/Microwave_Oven_Transformer_High_Voltage_Rig/http://www.instructables.com/id/Microwave_Oven_Transformer_High_Voltage_Rig/http://www.instructables.com/id/How-to-build-a-Tesla-Coil/step2/Gather-the-Materials/http://www.instructables.com/file/FTK9JNWFT7PQHWW/http://img.instructables.com/files/deriv/FHS/G533/FSUUXO16/FHSG533FSUUXO16.THUMB.jpghttp://img.instructables.com/files/deriv/F3P/8SR5/FSUUXNZV/F3P8SR5FSUUXNZV.THUMB.jpghttp://img.instructables.com/files/deriv/FAQ/53PL/FSUUXO8I/FAQ53PLFSUUXO8I.THUMB.jpghttp://img.instructables.com/files/deriv/FTK/9JNW/FT7PQHWW/FTK9JNWFT7PQHWW.THUMB.jpghttp://www.instructables.com/id/Microwave_Oven_Transformer_High_Voltage_Rig/http://www.instructables.com/id/Microwave_Oven_Transformer_High_Voltage_Rig/http://www.instructables.com/id/How-to-build-a-Tesla-Coil/step2/Gather-the-Materials/http://www.instructables.com/file/FTK9JNWFT7PQHWW/


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The total cost came to around $25, being that I already had the wood, Snapple bottles, PVC, andglue.

Secondary Coil: A length of 1.5" PVC (the longer the better)

About 300 feet of 24 AWG copper enameled wire

1.5" PVC screw-thing (see picture)

1.5" metal floor flange with threads

Spray on enamel

Circular, smooth metallic object for the discharge terminal

Base and Supra-base Various pieces of wood

Long bolts, nuts, and washers
http://www.instructables.com/id/How-to-build-a-Tesla-Coil/?ALLSTEPShttp://img.instructables.com/files/deriv/F2C/IKJG/FT7PU4IV/F2CIKJGFT7PU4IV.THUMB.jpghttp://img.instructables.com/files/deriv/FRD/6RWZ/FSUUXNVE/FRD6RWZFSUUXNVE.THUMB.jpghttp://img.instructables.com/files/deriv/FYX/TTWL/FT7PUJGG/FYXTTWLFT7PUJGG.THUMB.jpghttp://img.instructables.com/files/deriv/FFR/LF83/FSUUXNZW/FFRLF83FSUUXNZW.THUMB.jpghttp://img.instructables.com/files/deriv/FHW/NWA0/FSUUXO2L/FHWNWA0FSUUXO2L.THUMB.jpghttp://www.instructables.com/id/How-to-build-a-Tesla-Coil/?ALLSTEPS


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Primary Coil: About 10 feet of thin copper tubing

Capacitors: 6 Glass bottles (Snapple bottles workreally well)

Table Salt

Oil (I used canola. Mineral oil (horse laxative) it preferable as it doesn't mold, but I didn't

have any.)

Lots of aluminum foil

And a HV power source such as a NST, OBIT, or other transformer that gives off at least 9 kV ataround 30 mA.

Step 3Wind the Secondary

i
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Put a small slot into the top of the pipe to wrap one end of the wire around. Slowly and carefullybegin to wrap the coil, making sure that you don't overlap wires or have spaces. This step is thehardest and most tedious part, but taking a lot of time will yield a very nice coil. Every 20 or soturns, put a ring of masking tape around the coil to act as a barrier if the coil starts to unravel.Once finished, wrap a tight piece of tape around the top and bottom of the coil and spray it with2 or 3 coats of enamel.

Tips: I built a rig for winding my coil that consisted of a microwave turntable motor (3 RPM)

and a ball bearing. Use a small block of wood with a notch in it to straighten the wire and tighten the coil.

Step 4Prepare the Bases and Wind the Primary
http://www.instructables.com/id/How-to-build-a-Tesla-Coil/step4/Prepare-the-Bases-and-Wind-the-Primary/http://img.instructables.com/files/deriv/FJS/ETOK/FSUUXO45/FJSETOKFSUUXO45.THUMB.jpghttp://img.instructables.com/files/deriv/FA1/4EV4/FSUUXNY5/FA14EV4FSUUXNY5.THUMB.jpghttp://img.instructables.com/files/deriv/FR5/XUMM/FSUUXO17/FR5XUMMFSUUXO17.THUMB.jpghttp://img.instructables.com/files/deriv/FYC/NFZQ/FSUUXO50/FYCNFZQFSUUXO50.THUMB.jpghttp://www.instructables.com/id/How-to-build-a-Tesla-Coil/step4/Prepare-the-Bases-and-Wind-the-Primary/


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i

Align the metal stand in the center of the bottom board and drill holes for bolts to go through.attach the bolts tightly upside down. This will allow you to put a base for the primary on top of it.Then bolt the primary's base in. Take your pipe and wind it into a pretty upside down cone (notthe flat spiral in the pictures). Then mount it on the supra-base.
http://www.instructables.com/file/FB6NFMPFSUUXNTH/http://img.instructables.com/files/deriv/F5C/1OFU/FVS7L9HD/F5C1OFUFVS7L9HD.THUMB.jpghttp://img.instructables.com/files/deriv/FKD/82DV/FT7PJYYE/FKD82DVFT7PJYYE.THUMB.jpghttp://img.instructables.com/files/deriv/F32/ABIC/FT7PLVL0/F32ABICFT7PLVL0.THUMB.jpghttp://img.instructables.com/files/deriv/FB6/NFMP/FSUUXNTH/FB6NFMPFSUUXNTH.THUMB.jpghttp://www.instructables.com/file/FB6NFMPFSUUXNTH/


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Optional was the addition of 2 supports that I zip-tied the primary to.

Forgot to add how to make the spark gap! It is just two bolts in a open-air wooden box, and theyare adjustable for tuning, etc. See the last image...

Step 5Build the Capacitors

i

I decided to go the cheaper route and build a capacitor. The simplest way is to make a salt watercapacitor, using salt water, oil and aluminum foil. Wrap the bottle in foil, and fill it with water.Try to get equal amounts of water in each bottle, as it helps to keep the power output stable. The
http://www.instructables.com/id/How-to-build-a-Tesla-Coil/step5/Build-the-Capacitors/http://www.instructables.com/file/F8GVJUTFSUUXNU3/http://img.instructables.com/files/deriv/FTP/H38A/FSUUXNTJ/FTPH38AFSUUXNTJ.THUMB.jpghttp://img.instructables.com/files/deriv/F71/TIXE/FT7PQHWL/F71TIXEFT7PQHWL.THUMB.jpghttp://img.instructables.com/files/deriv/F8G/VJUT/FSUUXNU3/F8GVJUTFSUUXNU3.THUMB.jpghttp://www.instructables.com/id/How-to-build-a-Tesla-Coil/step5/Build-the-Capacitors/http://www.instructables.com/file/F8GVJUTFSUUXNU3/


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maximum amount of salt you can put in the water is .359 g/mL, but this ends up being a lot ofsalt, so you can tone down the amount a lot (I used 5 grams). Just make sure that you use hesame amounts on salt and water. Now put a few mL of oil slowly into the bottle. Punch a hole inthe top of the cap and put a length of wire in it. You now have one fully functioning capacitor, gomake 5 more.

Optional: to keep the bottles in order, make or find a metal crate for them

As Glenn781 pointed out below, 6 Snapple bottles with a 15kV 30mA NST can be deadly! If youare using a NST like his, use 8-12 bottles, not 6!

Step 6Connect Everything

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Wire up everything according to the schematic below. The secondary's ground CANNOT be putto mains ground, it will fry everything in your house.
http://www.instructables.com/id/How-to-build-a-Tesla-Coil/step6/Connect-Everything/http://www.instructables.com/file/FS6P585FVS7L8WI/http://img.instructables.com/files/deriv/FO7/G0FU/FVQYBSMP/FO7G0FUFVQYBSMP.THUMB.gifhttp://img.instructables.com/files/deriv/FS6/P585/FVS7L8WI/FS6P585FVS7L8WI.THUMB.jpghttp://www.instructables.com/id/How-to-build-a-Tesla-Coil/step6/Connect-Everything/http://www.instructables.com/file/FS6P585FVS7L8WI/


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My Coil's Specs 599 Wraps on secondary

6.5 Wraps on primary

Step 7Start it Up!

iBring it outside for it's first run, as it really isn't safe to run anything this potentially powerfulindoors, there is a high risk of fire. Flip the switch and enjoy the light show. My NST, at 9Kv at30mA, makes the coil give off 6 inch sparks. See it below:

Step 8For the Future...

There are a few things that I realize I should change in my next Tesla Coil, one of the main onesbeing the design of the primary coil. It needs to be both more tightly coiled and it needs morewindings. Also, i want to make a better discharge terminal. But, I have a new Tesla Coil plannedfor when i find the time and money, and it will probably be 6-7ft tall!

But for now, I'd like to admire other coilers hard work!(embedding seems broken, but links work)http://www.youtube.com/watch?v=iVmX2Ik4ylg
http://www.instructables.com/id/How-to-build-a-Tesla-Coil/step7/Start-it-Up/http://www.instructables.com/file/FAFIA27FVQYBSNR/http://www.instructables.com/id/How-to-build-a-Tesla-Coil/step8/For-the-Future/http://www.youtube.com/watch?v=iVmX2Ik4ylghttp://www.instructables.com/id/How-to-build-a-Tesla-Coil/step7/Start-it-Up/http://www.instructables.com/file/FAFIA27FVQYBSNR/http://www.instructables.com/id/How-to-build-a-Tesla-Coil/step8/For-the-Future/http://www.youtube.com/watch?v=iVmX2Ik4ylg


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Author: nickademuss

A+ certified with a degree in electronics engineering, and professional

photographer using Nikon digital and film cameras for many years.

i

Lets build a 900,000+ volt Van de Graaff generator!!

I built this one in about a week, using scrap parts from a sewing machine and

materials ordered from http://www.grainger.com/Grainger/wwg/start.shtml

I have seen the larger machines in operation at my local science museum and this

one does just as well. I have made hair stand on end and even pie pans float up and
http://www.instructables.com/member/nickademuss/http://www.instructables.com/file/FC34RIZFORZTJ0O/http://www.grainger.com/Grainger/wwg/start.shtmlhttp://www.instructables.com/member/nickademuss/http://www.instructables.com/file/FC34RIZFORZTJ0O/http://www.grainger.com/Grainger/wwg/start.shtml


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off the machine.

For an explanation of operation go to Wikipedia:

http://en.wikipedia.org/wiki/Van_de_Graaff_generator

ALSO, note that this machine can generate enough static to stop a pacemaker and

any other digital device, keep people with heart problems away. Also if you dont

wont to blow up you sensitive electronic devices make sure you either use the

machine on a separate circuit or unplug everything you want to keep. I have also

stopped watches and killed cell phones with it. The current is low around 27micro

amps but that's a thousand times whats needed to kill say your flat screen TV or

pc/laptop.

Well if your know anything about Van de Graaffs you know that the bigger and

smoother the sphere or collector the bigger the charge. Any bump or lip on the

sphere and all the charge will run to it and bleed off.

You see the voltage is determined by how much you can store on the surface of the

dome, sphere, collector. I used a 12" stainless steel garden gazing ball. I bought it

from a garden supply center for $40.00. it throws faint sparks around 12" and

strong bright ones at 8" to a grounded door knob. That's 883,920 volts by the

calculator or 4350 volts per millimeter.

The recharge rate or time it takes to build up a charge high enough to jump from

the sphere is determined by belt speed and width.

I used an art program to generate some diagrams and several pics of the completed

unit, its a simple mechanism and you could upscale it for a larger machine easily

topping 1,000,000 volts. all you need to do it increase the sphere size and belt

width.

This one is an upscale version that I used to test equipment at work and I used the

little one to determine the best belt material.

I tried plastic tape, rubber, fabrics, and the hands down best was a plastic coated

fabric used in hotel shower curtains. Its easy to cut and glue and lasts for a long

time. The charge it carries was easily 50% better than everything I tried.

Also to get the most of your machine you will need to get your hands on some

Teflon and some nylon to make the rollers out of. I ordered mine from Granger

(links in parts list) I used the Teflon for the top and nylon for the bottom or drive

roller. You can also get the Teflon from stacking little half inch thick disks cut with a

2" diameter hole saw from cutting boards. You could also make the top and bottom

roller out of the same material and coat the top roller with Teflon tape.
http://en.wikipedia.org/wiki/Van_de_Graaff_generatorhttp://en.wikipedia.org/wiki/Van_de_Graaff_generator


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Also if you want to boost your storage and spark a bit build this:

Leyden jar of DOOM!

I will try to list as many tips threw this process as I can. Its been several years since

I built the machine and its worked well so far.

Enjoy,

Zachary M.

Clinton, TN

Next up a parts list......

Step 1 Parts List (give or take a few items...)
http://www.instructables.com/id/Leyden_jar_of_DOOM/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step1/Parts-List-give-or-take-a-few-items/http://www.instructables.com/id/Leyden_jar_of_DOOM/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step1/Parts-List-give-or-take-a-few-items/


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i

Sphere-- Garden gazing ball, stainless (glass or plastic will not work)

4" PVC sewer pipe 24" long

4" PVC sewer pipe coupling

2" Diameter 2.75" long Teflon roller Grainger Item # 2NJA2

http://www.grainger.com/Grainger/items/2NJA22" Diameter 2.75" long Nylon roller Grainger Item # 1UTY5 http://www.grainger.com

12" x 12" plywood 3/4" thick

12" x 18" plywood 3/4" thick

1/2" all thread (threaded rod) you will need enough to make four pieces 9" long.

1/2" nuts for the all thread, you will need 16 of them also 16 washers

4/40 by 1" bolts I used about 10 of them

Power switch, 120v 5amp
http://www.instructables.com/file/FO4GZRGFORZTFL7/http://www.grainger.com/Grainger/items/2NJA2http://www.grainger.com/http://www.instructables.com/file/FO4GZRGFORZTFL7/http://www.grainger.com/Grainger/items/2NJA2http://www.grainger.com/


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Sheet of copper, I got mine at the hobby store 9 or copper roof flashing at a

hardware store.

box of stick pins

3/4 inch copper pipe around 14" long (I would get at least two feet so you have

leverage to bend it)

120volt power cord120volt sewing machine motor with drive pulley and belt. (mine was from a Brother)

Or Usehttp://www.grainger.com/Grainger/items/2M033 and Small pulley Granger PN

1X459

12" x 12" PVC sheet 1/4" thick (thick plexi glass will work just as well, and look cool

to!)

Axel for top and bottom rollers (whatever you can find, I pulled mine from the

sewing machine)

120v panel light, optional

PVC glue

Super Glue medium thickness for the belt

Vinyl covered fabric for belt (shower curtain or cheap strap)

Step 2 Belt Material and were to get it!

i
http://www.grainger.com/Grainger/items/2M033http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step2/Belt-Material-and-were-to-get-it/http://www.instructables.com/file/FX8UIGGFOMYODTQ/http://www.grainger.com/Grainger/items/2M033http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step2/Belt-Material-and-were-to-get-it/http://www.instructables.com/file/FX8UIGGFOMYODTQ/


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I had several questions about the belt material, and its the most important piece to

the VDG next to the sphere.

What you need is 18 oz. Vinyl Coated Polyester

A very tough mesh fabric that is coated with vinyl making it waterproof with a high

resistance to dirt, mildew, oil, salt, chemicals and UV. Outstanding strength. Madeof top quality materials, will not tear, stretch, crack, rot or mildew. May be sewn or

glued with HH-66 vinyl cement.

Were you can get it!!!

They have a 42 oz. version but I have not tried it.

I got mine in white, almost all the black materials I tested didn't do so well.

Step 3 Tools needed (give or take again...)
http://www.seattlefabrics.com/vinyl.html#Clear%20Vinyl%20Laminated%20Polyesterhttp://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step3/Tools-needed-give-or-take-again/http://img.instructables.com/files/deriv/FGQ/OIXK/FOMYODTP/FGQOIXKFOMYODTP.THUMB.jpghttp://img.instructables.com/files/deriv/FX8/UIGG/FOMYODTQ/FX8UIGGFOMYODTQ.THUMB.jpghttp://www.seattlefabrics.com/vinyl.html#Clear%20Vinyl%20Laminated%20Polyesterhttp://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step3/Tools-needed-give-or-take-again/


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i

Drill with bits

Table saw or equivalent (skill saw)

Wrench's

Dremel toolscissors

Torch(optional but makes it work better)

screw driver for what ever screws you use...

Hole saw or jigsaw

hack saw

soldering iron w/solder

Step 4 Building the base Step 1
http://www.instructables.com/file/F1O0EJZFORZTFLL/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step4/Building-the-base-Step-1/http://www.instructables.com/file/F1O0EJZFORZTFLL/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step4/Building-the-base-Step-1/


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i

Cut out your plywood base like the pic, or as long as you keep the top and bottom

the same size you can make it whatever shape you want, it will be up to you to

determine if you can fit the motor in it.

The top piece is 12" square with the hole centered in it. I recommend laying the twopieces on top of each other and drilling the four support bolt holes at the same time

so they line up perfectly.

Step 5 Base step 2
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i

Cut a couple of 3/4" rings off of the PVC coupler and glue one of them to your main

PVC pipe using PVC glue about three inches up one end.

After it dries, fit it threw the hole in the top piece of plywood and glue the bottom

ring on to hold it in place.

Get it as tight as you can and it wont slip on you.

Step 6 Base, step 3
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i

Next cut the all thread to 9" lengths and assembly like in the pic.

The reason I made it this was was so that you can adjust the belt tension and level

the top roller to the bottom roller. You dont have to bolt the top on permanently just

yet, you need to add the motor and and comb.

Step 7 Base step 4
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i

look at the pics and cut the PVC sheet to make a small box for the roller to ride in. I

used the shaft and bearing from the sewing machine. I added a couple of screws to

hold in the comb.
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A note on the combs both of them the top and bottom ones are nothing more than

stick pins soldered in sheet copper. about 1/4" apart. the sharper the better. the

bottom one is wired directly to ground.

the top one is touching a spring that contacts the sphere.

Step 8 Base step 5

i

Next add the motor and pully, then the comb on the back side of the roller, later

when you put the belt on you can flex the soft copper of the comb to adjust the

space between the roller and the pins, the closser the more charge gets transferred.

Step 9 Base step 5 another view
http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step8/base-step-5/http://www.instructables.com/file/F571B8BFORZTFQK/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step9/base-step-5-another-view/http://img.instructables.com/files/deriv/FVZ/9IBW/FSK1E60V/FVZ9IBWFSK1E60V.THUMB.jpghttp://img.instructables.com/files/deriv/F57/1B8B/FORZTFQK/F571B8BFORZTFQK.THUMB.jpghttp://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step8/base-step-5/http://www.instructables.com/file/F571B8BFORZTFQK/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step9/base-step-5-another-view/


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i

Mechanical side of the base completed

Step 10 Base step 5 pic
http://www.instructables.com/file/FURN3A0FORZTFUY/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step10/Base-step-5-pic/http://www.instructables.com/file/FURN3A0FORZTFUY/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step10/Base-step-5-pic/


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i

Note: the motor and bottom pulley needs to turn counter clock wise in the pic

below.

The belt and matching pulleys came from the sewing machine.

The aluminum box I mounted the bottom pulley to is just a spacer, you don't have

to build yours that way.

I made my motor clamp out of a couple of bolts and a scrap piece of metal with two

holes drilled in it.

Step 11 Base (comb and bottom roller)
http://www.instructables.com/file/FXAM4S4FORZTFQL/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step11/Base-comb-and-bottom-roller/http://img.instructables.com/files/deriv/FVZ/9IBW/FSK1E60V/FVZ9IBWFSK1E60V.THUMB.jpghttp://img.instructables.com/files/deriv/FXA/M4S4/FORZTFQL/FXAM4S4FORZTFQL.THUMB.jpghttp://www.instructables.com/file/FXAM4S4FORZTFQL/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step11/Base-comb-and-bottom-roller/


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The bottom comb position in relation to the bottom roller is shown below.

Note that the roller will be turning counter clock wise and that the pins are just

above were the belt will leave the roller.

Step 12 Base step 6

i

Wire up the motor, power cable and switch, please shield everything and use a

three wire power cable so you can ground it.

I had a left over modem case that I put my power switch in, you can use whatever

you like as long as you shield it.

Note: after operation, if you dont discharge the sphere you can get a shock from the

power switch.

Step 13 Time for the top 1
http://www.instructables.com/file/FB07T1TFOMYOEDG/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step12/base-step-6/http://www.instructables.com/file/F9EHAA4FORZTFU4/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step13/Time-for-the-top-1/http://www.instructables.com/file/FB07T1TFOMYOEDG/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step12/base-step-6/http://www.instructables.com/file/F9EHAA4FORZTFU4/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step13/Time-for-the-top-1/


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i

Make the top comb as shown, its just a set of pins that need to be held next to the

side of the belt just before it touches the top roller. the long tale of copper is to

make a spring to touch the inside of the sphere as close the middle as possible.

I put to 4/40 bolts in the top of the machine for this assembly to sit on, this is a very

loose design, just get it close without touching the belt and it will grab a great

charge.

Step 14 Assemble The Belt
http://www.instructables.com/file/FVCRU9UFORZTFVW/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step14/Assemble-The-Belt/http://www.instructables.com/file/FVCRU9UFORZTFVW/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step14/Assemble-The-Belt/


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I used a piece of string to measure how long the belt needed to be, and I also left

the top deck lowered about an inch so I could tighten the belt up later.

I recommend cutting the belt as pictured below, then gluing a patch over it. I put

mine on some wax paper so I could use allot of glue and not stick it to my table. The

patch I made was "V" shaped and about 3/4" wider than the seam. See pic in step

15 as well.

Step 15 Top roller
http://www.instructables.com/file/F7WM4AUFOHXBMNJ/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step15/Top-roller/http://img.instructables.com/files/deriv/FD8/AD3I/FORZTFYE/FD8AD3IFORZTFYE.THUMB.jpghttp://img.instructables.com/files/deriv/F7W/M4AU/FOHXBMNJ/F7WM4AUFOHXBMNJ.THUMB.jpghttp://www.instructables.com/file/F7WM4AUFOHXBMNJ/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step15/Top-roller/


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I used the rest of the sheet PVC (you could also use Plexiglas) I made a slot for the

belt to come threw and used some scrap plastic to hold up the top roller.

Step 16 Top roller another view and belt construction.
http://www.instructables.com/file/F1DL187FORZTFXE/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step16/top-roller-another-view-and-belt-construction/http://www.instructables.com/file/F1DL187FORZTFXE/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step16/top-roller-another-view-and-belt-construction/


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NOTE the way I cut the belt in a "V" shape and used another piece to cover it, that

way you wont have a lump in the belt. I measured for the belt and made it as wide

as I could without it slapping the sides when its running. The teflon is so slick I didnt

use bearings on the top! its just a solid non turning shaft. The belt is 1.75" wide. Notsure how long.

After you have cut and glued the belt, you can put it on, you simply use the four

support bolts to tighten it up, don't go to far you just want it tight enough to spin,

and not slap the side of the column when its up to speed, this will kill your charge. If

your belt does not track right you can fix that by moving one side of the supports up

a little at a time, go slow and make the belt center in the rollers. You can also

"crown" one of your rollers, that is to make it "keg" shaped. The downside to this is

that you lose a little surface contact and in turn a little recharge power.

Optional: you can make the top roller adjustable as well to help center the belt.

Step 17 Sphere

i

Use a Dremel tool with a good cutting disk and cut a 4.5 inch hole your sphere and

make sure it fits.

Take your time and cut slowly, the woven carbide disks worked best.
http://www.instructables.com/file/FD8AD3IFORZTFYE/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step17/Sphere/http://www.instructables.com/file/FP7PBW2FORZTG1M/http://www.instructables.com/file/FD8AD3IFORZTFYE/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step17/Sphere/http://www.instructables.com/file/FP7PBW2FORZTG1M/


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The first time I fired mine up it worked but had allot of sparks jumping from the

bottom of the sphere, to solve or help this problem I fitted a copper ring for the

sphere to sit on. This will fold the charge back up to it. If you dont have a pipe

bender tape one end of the pipe shut, fill it with water and freeze it that way you

wont kink it wile hand bending it.

After I got the copper ring bent in a circle I cut it and clamped it, so it could be

soldered with the torch

I also cut several more 1/2 inch tall rings off the coupler and put them on the

column, this keeps the voltage from creeping down.

Also make the sphere sit as high on the column as you can without losing contact

with the comb inside, my sphere is around 4" down the column.

Step 18 Diagram
http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step18/diagram/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step18/diagram/


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1= dome

2= collector comb

3= top teflon roller

4=upward side of belt positive charge

5-downward side of belt, negative charge

6=bottom nylon roller

7=bottom comb

8=grounded ball

9= SPARK!!!!!!!!!

Step 19 Time to play

i

Make sure the subject, in this case me, is standing on something insulated and have

them touch the sphere, then turn on the machine, hair will stand.

You will also get a great effect on a humid summer night out side in total darkness,

you can view the plasma coming from you and the sphere.
http://www.instructables.com/file/FUULIGWFORZTG2Q/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step19/Time-to-play/http://www.instructables.com/file/FR25ZDHFORZTG30/http://www.instructables.com/file/FUULIGWFORZTG2Q/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step19/Time-to-play/http://www.instructables.com/file/FR25ZDHFORZTG30/


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Also once its running good, tape a thumb tack with the point out to the top of the

sphere, watch the plasma jet from it.

take five pie pans and stack them on top of the sphere and turn it on, one by one

they will float up and fly off the machine.

Hold a florecent tube in your hand near it, it will glow! (you will get a few sparks to

you doing this be ready and dont drop the bulb)

I would build a discharge wand to, or stick with a metal ball on the end that's

grounded to the machine. You can use a large tin foil ball and a good insulated wire.

You can take it a step further with a leyden jar like the one here:

Leyden jar of DOOM!

Just be careful with any leyden jar they let you store enough current to cause you

serious harm.

Also it will hold a charge for sometime after you turn it off. So discharge it before

your curious cat looks at his reflection and gets popped in the nose like mine.....

Step 20 In action

i
http://www.instructables.com/id/Leyden_jar_of_DOOM/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step20/In-action/http://www.instructables.com/file/FCIKZNUFORZTG43/http://www.instructables.com/id/Leyden_jar_of_DOOM/http://www.instructables.com/id/900000-volt-Van-de-Graaff-Generator-using-cheap-p/step20/In-action/http://www.instructables.com/file/FCIKZNUFORZTG43/


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3 min, exposure in a dark room, the other ball is grounded and attached to a stick.

See it and other photos that I have taken here:

http://www.flickr.com/photos/22560053@N04/

Nickademusss Photo Stream

Most of the best visuals with a Van De Graaff are in a dark room, the light is subtle.

Enjoy email with questions :)
http://www.flickr.com/photos/22560053@N04/http://www.flickr.com/photos/22560053@N04/http://img.instructables.com/files/deriv/FWF/5HIN/FQ6EBCI6/FWF5HINFQ6EBCI6.THUMB.jpghttp://img.instructables.com/files/deriv/FCI/KZNU/FORZTG43/FCIKZNUFORZTG43.THUMB.jpghttp://www.flickr.com/photos/22560053@N04/http://www.flickr.com/photos/22560053@N04/

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