If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Hazmatt_(The Underdog) wrote ...
Here's mine, using a little sewing machine motor, gets hot but it works pretty good.
The real trouble is it has no optical tracking and the inertia of the gap is a lot for this little motor so regulation is not really possible. This would need a PID controller to maintain speed properly.
That is a nice little rsg. I have a little sewing machine motor, about the same size, but the problem is that it does not have a screw shaft, and i cannot think of anything to make it work but a few pulleys. But it does have a flat milled onto the shaft. Sears kenmore, 25/60hz(says cycles, but same freaking thing) and 1.2 amps. It runs with ac/dc cause it is universal motor. I say all this, cause i am wondering if it is anything like yours. If so i might get some small pulleys and bearings and something to clamp the bearings down and make a nice little arsg. Since it is universal, i can adjust speed with variable voltage, or PWM easily.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
You order the shaft adapter .. an arbor.. from Grainger or McMaster Carr. The only trouble with this is that the washers you get with the arbor kit usually are not symmetrical or flat enough, so you have to make adjustments until the arbor and your disks are perpendicular. Other then that it works pretty well.
The rotary is mounted vertically to keep the motor from plunging in and out as much as it would in horizontal position, that way you can close the gap further. It also allows more storage space on the base of the TC, an extra bonus if you need to situate more NST's.
I came up with soldering the pipe nipples onto a pcb and gapping them, but adjusting it is tricky and I gave that up a while ago. I liked it's style better then the drawer pulls, but that's how it goes sometimes.
The gap works pretty well at about 65V from a variac, that's the approximate sync voltage, but bare in mind I haven't had a chance to strobe tach it yet, the strobe needs fixing.
I have thrown tungsten once so far, but that's because an upper set screw loosened, so care must be taken with this stuff still. Plastic disk would not have survived in my opinion because not only did the flying electrode chip the end off the tungsten rod.... it literally bent the electrode! There's a lot of force in those flying electrodes and if the disk cracks or gets out of balance for only an instant, the inertia will tear itself apart and cause an explosion. I really wouldn't go for plastic, go for something that's reinforced.
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
Rotary spark gaps.
