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Holiday project!

rjenkinsgb

Well-Known Member
Most Helpful Member
Hi all,

I've just finished another of my long term parts-collection projects - my first Van de Graaff generator:

TheMachine.jpg


The mechanism is built around a glass guitar slide for the bottom roller, a bit of 25mm PVC conduit sleeved with some silicone rubber tube at the top, and neoprene strip for the belt.
Plus various 3D printed parts & mechanical bits.

The dome is made up from some kind of jelly mould I saw by chance on ebay, plus a stainless steel bowl; it works, though there is some arcing and occasional streamers from the joint, as the mould has a small rolled edge. The kapton tape wrap over the joint made a massive difference and the arcs increased from under an inch to near a foot at times - though still some strays and leakage under the tape.

The acrylic tube is 1m tall and 90mm o/d.

These images are stills screengrabbed from video, so the quality is not brilliant, but they show the results!


Arcs_1.png
Arcs_2.png
Arcs_3.png
 

shortbus=

Well-Known Member
Most Helpful Member
Looks good! I need to get busy and finish making mine, bought the stuff years ago and it just is sitting in a box in the attic. I really like static electric spark making stuff.
 

Nigel Goodwin

Super Moderator
Most Helpful Member
Long ago, when I was back at school, the Physics teacher set up the Van De Graff generator on the edge of a bench, placed a wooden stool on the floor nearby, and stood a long haired pupil on the stool, with their hand placed on top of the dome.

He then switch the generator ON, and (as you would expect) the pupils hair stuck out in a nice large 'ball'.

The teacher then explained what was happening, and why - all the time walking round and gesturing with his arms.

Unfortunately he got too close to the pupil, and a huge spark leapt from the pupils nose to the teachers fingers :D
 

picbits

Well-Known Member
I used to work on a machine that made rolls of toilet paper and paper hand towels. The papers went over a series of rollers coated in plastic .....

Once you'd rolled a couple of hundred metres of capacitor, you needed to be rather cautious approaching the rolls of paper !
 

Musicmanager

Well-Known Member
I'm very impressed with this RJ, very impressed !

All you need now is a tall chap with a flat top head and a bolt through his neck; hook him up and you'd have Albert Einstein's brother, Frank !

I haven't seen AG for several days .. .. .. .. . :)

MM
 

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