Welcome
Username or Email:

Password:


Missing Code




[ ]
[ ]
Online
  • Guests: 84
  • Members: 0
  • Newest Member: omjtest
  • Most ever online: 396
    Guests: 396, Members: 0 on 12 Jan : 12:51
Members Birthdays:
All today's birthdays', congrats!
Mathias (41)
slash128v6 (52)


Next birthdays
02/01 Barry (70)
02/01 Snowcat (37)
02/01 wylie (43)
Contact
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.
Forums
4hv.org :: Forums :: Tesla Coils
« Previous topic | Next topic »   

Rotary spark gap help.

1 2 
Move Thread LAN_403
the mad scientist
Sat Mar 16 2013, 05:20PM Print
the mad scientist Registered Member #3768 Joined: Tue Mar 22 2011, 12:46AM
Location:
Posts: 107
I am wondering what would I use to mount electrodes onto the rotating disk...
Back to top
HV Enthusiast
Sun Mar 17 2013, 12:37AM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Generally, i've seen them where they press fit the tungsten rods directly into the rotor disk and then use set screws on the outside edge of the rotor for added security.
Back to top
the mad scientist
Sun Mar 17 2013, 04:28PM
the mad scientist Registered Member #3768 Joined: Tue Mar 22 2011, 12:46AM
Location:
Posts: 107
You see I don't have access to those type of tools. I don't even know how I am going to make the disk...
Back to top
HV Enthusiast
Sun Mar 17 2013, 05:36PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Check out the two rotary spark gap variants that Terry Blake made about 10 years ago. These work great - i've built the second type for an ASRG gap 10 years ago following his design and it worked great for up to 3kW operation.

Link2

Just be sure to put these in shielded (lexan for example) enclosures as if the rods to hit each other, you could have flying tungsten which is very brittle and sharp.
Back to top
the mad scientist
Sun Mar 17 2013, 06:54PM
the mad scientist Registered Member #3768 Joined: Tue Mar 22 2011, 12:46AM
Location:
Posts: 107
What should I make the disc out of though?
Back to top
HV Enthusiast
Mon Mar 18 2013, 01:14PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
the mad scientist wrote ...

What should I make the disc out of though?

If you go the Terry Blake route, then you don't need a disk. You can just just square polyethylene plastic which is what he used.

For a conventional rotary spark gap, the materials commonly used are Phenolic (easy to machine) or G-10 (difficult to machine)
Back to top
the mad scientist
Mon Mar 18 2013, 06:25PM
the mad scientist Registered Member #3768 Joined: Tue Mar 22 2011, 12:46AM
Location:
Posts: 107
Ok sounds good, I have another question, I have 4 pure tungsten electrodes for me to do the Terry Blake rotary spark gap. But for the propeller peice would it be alright if I just used brass?
Back to top
HV Enthusiast
Mon Mar 18 2013, 10:18PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
For propellar, use tungsten as well. I believe Terry used 1/8" diameter tungsten rods.
Back to top
the mad scientist
Tue Mar 19 2013, 01:36AM
the mad scientist Registered Member #3768 Joined: Tue Mar 22 2011, 12:46AM
Location:
Posts: 107
Is that a must because I don't think I can get my hands on any more pure tungsten in time, are you sure brass wont suffice?
Back to top
HV Enthusiast
Tue Mar 19 2013, 03:05PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
mcmaster-carr sells the 1/8" tungsten rods.
Back to top
1 2 

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob

Go to:

Powered by e107 Forum System
 
Legal Information
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.