Hi All, I haven't built my own generator yet, but I own the small and large generators from Science First (older large model). When the price of the belt for...
About gluing, rubber cement really produces curling. I got around the problem by gluing pieces of acrylic to the belt ends with a weak glue that could be...
Hello everyone; I'm a new member to the group. My 10 & 12 year old sons and I have been working on some science projects (solar concentrators and small ...
John, Welcome to the group. Your childhood is much like my own. One of my passions was for carbon arcs with heating-element ballasts. A favorite toy was a blob...
Hi John: Welcome! To start, your first few paragraphs ring very familiar. Not relative to your sons, because I have daughters, now 41 and 46 years old. The...
Don: I see we came up with different MCM cat #s. Could be that we have different catalog editions. Mine is several years old. John, the best way is to check ...
... motor. Induction (AC only) motors lock into the frequency of the power, and their speed cannot be controlled by varying the voltage with a Variac.... ...
John, It seems like you have things under control. I should have mentioned, for the benefit of others, that solid-state ac/dc motor speed controllers are not...
John, Don and the VDG group; My first and last experience with solid state speed control was a disaster. The voltage spikes induced in the AC mains when the...
... disaster.... That reminds me how surprised I was to see so many pictures of unshielded motors in home made VDGs. The case of the motor and the metal drive...
John and the Group: I don't think the susceptibility of motors is quite as dire as you suspect. My big VDG has a 36" sphere, six inch wide belt which runs at...
For those interested in the history of invention, I have permission to share an excerpt from the new book, "Much Ado About *Almost* Nothing," a history of...
Hi Voltage some of my fantafull ideas on hivoltage that we will experiment with can you please give me feed back if that wont work as link then www.alrart.net/...
Things are progressing a bit slower than expected but are finally coming together. I'd originally planned to use a small 12-24V motor with a 50W rheostat to...
Hi John: Since rehostats are basically a variable resistance in series with the load and source voltage, the result is a poorly regulated power source for the ...
John and Dick: I'm building a medium sized machine. I've not found any reasonably priced spheres yet. I've looked at gazing balls, but the best price I've...
John: My small VDG uses an 18" stainless gazing ball and if I recall correctly I paid around $75 plus shipping from a garden supply place in the south eastern...
... ... > I'm building a medium sized machine. I've not found any reasonably > priced spheres yet. I've looked at gazing balls, but the best price > I've found...
Hi all, I still haven't built any Van de Graaff, just a whimshurts in the past. What about using a long thin blade that you first make hot on fire to make a...
I've had good luck cutting the stuff by putting down masking tape, marking on the tape and then cutting with scissors. I believe the stuff is treated with...
Hi all , A very nice book is : Electrostatics Accelerators / Fundamentals and Applications by R. Hellborg ( Springer Ed.2005) Here is a fragment of chapter 6 :...
I hope that I'm not breaking VDG forum etiquette by adding these occasional progress updates as replies to my own thread. My VDG project has turned out to be...
Hi John: You said it in a nutshell. the learning experience is terrific and the fellowship on the forum is outstanding. There are some items, cylindrical in...
Post your questions on this FORUM. Lots of help here. There are just too many topics within the VDG framework to guess at what issues you want to discuss. ...
i've tried searching for a post that would answer my question; there are hundreds of posts and i haven't seen it. i was given a high rpm vaccume sweeper motor...
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