Date: Thu, 24 Feb 2011 10:15:25

Author: Doug Johnson

Subject: Re: Best commercial VDG

Post:

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Urs,
If warming it up didn=B9t work and a new belt, put a charge on the dome
and see if it can hold a charge. Take off the belt if it doesn=B9t and try
again. If the dome doesn=B9t hold a charge, try cleaning the support tube
inside and out with alcohol again with some really clean rags. My last
failure was dirt on the inside of the tube holding the dome up.

...Doug J. =20


On 2/24/11 9:52 AM, "Tom Johnson" wrote:

> Try putting the belt in a ziplock bag with talc powder and shake it. Kno=
ck
> off the excess talc from the belt. It has helped in the past.
>=20
> At 09:43 AM 2/24/2011, you wrote:
>=20
>> Try warming it up with a hair dryer. ...Doug J.
>>=20
>>=20
>> On 2/24/11 9:16 AM, "Zani, Gerald" wrote:
>>=20
>> Urs,
>>=20
>> The culprit is often the belt. Try replacing it even if the one you hav=
e
>> looks good. Still replace it with a new belt and test it out.
>>=20
>> I do not like the belt on the the Winsco and the SF model VDG.
>>=20
>> I was blown away when I witnessed the fantastic silicone coated rubber b=
elt
>> on the new Japanese made VDG called the VDG Raijin.
>>=20
>> http://nadascientific.com/science_education/van-de-graaff-raijin.html
>>=20
>> In my opinion this Raijin VDG is the best one on the market today. I wa=
tched
>> it perform quite well here in RI in the summer where we suffer from extr=
eme
>> humidity in the summer because the humidity saturated hot air.
>>=20
>> If you're interested then talk with a fellow named Nouri Dassi. He is th=
e USA
>> representative. He can have the European rep contact you and visit you=
and
>> perform a demonstartion.
>>=20
>> Here is Nouri's contact info:
>>=20
>> Nouri Dassi, Vice President
>> NADA Scientific, Ltd.
>> 72 Lake Street
>> Rouses Point, NY 12979
>> Phone: 1-800-799-6232
>> Fax: 518-297-3524
>> nouri@nadascientific.com <
>> mailto:nouri@nadascientific.com >
>>=20
>>=20
>> Best,
>> - Jerry
>>=20
>>=20
>> On Thu, Feb 24, 2011 at 11:38 AM, Urs Lauterburg
>> wrote:
>> Dear Tap-lers,
>>=20
>> Year ago (approx. 2004), following a discussion on tap-l about the best
>> performance/prize VDG I did purchase the 400kV version from Science Firs=
t. It
>> worked quite well in the beginning but slowly degraded over the years of
>> moderate use for occasional lecture demonstrations and suddenly turned v=
ery
>> faint now when set up again for electrostatics.
>>=20
>> Once again I cleaned everything according to the Science First manual an=
d
>> according to tips from the William Beaty's VDG taming page (thanks Bill!=
)
>>=20
>> http://amasci.com/emotor/vdgtame.html
>>=20
>> This made it go a bit but performance somehow quickly deteriorated again=
. I
>> have no real clue to why this is. The belt, the combs, the pulleys, the
>> column?.. whatever.
>>=20
>> Maybe a fellow Tap-ler has the igniting idea based on a similar experien=
ce
>> with the SF-VDG. Are the ones SF sells actually made by Winsco? Are they=
the
>> same? What would be the best commercially available VDG that shows long
>> longevity with unproblematic performance with a clear and effective
>> maintenance scheme?
>>=20
>> I am aiming at consistent 10'' sparks in dry weather conditions.
>>=20
>> Thankful for any type of inputs
>>=20
>> Urs
>>=20
>> Urs Lauterburg
>> Physics demonstrator
>> Physikalisches Institut
>> University of Bern
>> Switzerland
>>=20
>> PS: I know Sam will tell me to grow my own ;-).
>>=20
>>=20
>>=20
>=20
> Later,
> Tom G. Johnson
> Dept. of Physics & Astronomy
> Washington State University
> Pullman, WA 99164-2814
> Phone: (509) 335-5097
> Email: johnstm@wsu.edu
> Web page: http://physics.wsu.edu/demos/default.htm
>



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Urs,<=
BR>
If warming it up didn’t work and a new belt, =
put a charge on the dome and see if it can hold a charge. Take o=
ff the belt if it doesn’t and try again. If the dome doesn’=
;t hold a charge, try cleaning the support tube inside and out with alcohol =
again with some really clean rags. My last failure was dirt on the ins=
ide of the tube holding the dome up.

...Doug J.


On 2/24/11 9:52 AM, "Tom Johnson" wrote:<=
BR>

Try putting the belt in a ziplock bag with talc powder =
and shake it. Knock off the excess talc from the belt. It has he=
lped in the past.

At 09:43 AM 2/24/2011, you wrote:

Try warming it up with a hair dryer. ...Doug J.


On 2/24/11 9:16 AM, "Zani, Gerald" =
wrote:

Urs,

The culprit is often the belt. Try replacing it even if the one you h=
ave looks good. Still replace it with a new belt and test it out.

I do not like the belt on the the Winsco and the SF model VDG.

I was blown away when I witnessed the fantastic silicone coated rubber belt=
on the new Japanese made VDG called the VDG Raijin.

http://nadascientific.com/science_education/van-de-graaff-raijin.html

In my opinion this Raijin VDG is the best one on the market today. I =
watched it perform quite well here in RI in the summer where we suffer from =
extreme humidity in the summer because the humidity saturated hot air.

If you're interested then talk with a fellow named Nouri Dassi. He is the U=
SA representative. He can have the European rep contact you and =
visit you and perform a demonstartion.

Here is Nouri's contact info:

Nouri Dassi, Vice President
NADA Scientific, Ltd.
72 Lake Street
Rouses Point, NY 12979
Phone: 1-800-799-6232
Fax: 518-297-3524
nouri@nadascientific.com < <=
;mailto:nouri@nadascientific.com> mailto:nouri@nadascientific.com >


Best,
- Jerry


On Thu, Feb 24, 2011 at 11:38 AM, Urs Lauterburg nibe.ch> wrote:
Dear Tap-lers,

Year ago (approx. 2004), following a discussion on tap-l about the best per=
formance/prize VDG I did purchase the 400kV version from Science First. It w=
orked quite well in the beginning but slowly degraded over the years of mode=
rate use for occasional lecture demonstrations and suddenly turned very fain=
t now when set up again for electrostatics.

Once again I cleaned everything according to the Science First manual and a=
ccording to tips from the William Beaty's VDG taming page (thanks Bill!)

http://amasci.com/emotor/vd=
gtame.html

This made it go a bit but performance somehow quickly deteriorated again. I=
have no real clue to why this is. The belt, the combs, the pulleys, the col=
umn?.. whatever.

Maybe a fellow Tap-ler has the igniting idea based on a similar experience =
with the SF-VDG. Are the ones SF sells actually made by Winsco? Are they the=
same? What would be the best commercially available VDG that shows long lon=
gevity with unproblematic performance with a clear and effective maintenance=
scheme?

I am aiming at consistent 10'' sparks in dry weather conditions.

Thankful for any type of inputs

Urs

Urs Lauterburg
Physics demonstrator
Physikalisches Institut
University of Bern
Switzerland

PS: I know Sam will tell me to grow my own ;-).




Later,
Tom G. Johnson
Dept. of Physics & Astr=
onomy
Washington State University=

Pullman, WA 99164-281=
4
Phone: (509) 335-5097=

Email: johnstm@wsu.edu
Web page: http://physics.wsu.edu/demos/default.htm
.wsu.edu/demos/default.htm>






--B_3381387326_5314668--



From tap-l-owner@lists.ncsu.edu Thu Feb 24 16:30:14 2011

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