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 #2848
Joined: Tue May 04 2010, 05:19AM
Location:
Posts: 44
wow that looked like it worked really well! (or it could have been that the projectile still tumbled and luckily hit the foam in the orientation it did. any idea how much rpm it was spinning at?
Registered Member #1805
Joined: Sat Nov 08 2008, 06:29AM
Location:
Posts: 67
I wish i could tell the RPM... Its a motor from a fixed speed engraver that had 3.6 volt batteries running it. In the video I'm running it at 12v. So its spinning really fast in my eyes... and yeah I'm going to do a test with 5 or so sheets of paper equally spaced to see whether the projectile flies straight or not.
Registered Member #1525
Joined: Mon Jun 09 2008, 12:16AM
Location: America
Posts: 294
If you have a pot with a free-spinning wiper you can mount the pot shaft to the motor shaft and then put a low voltage across the pot (with a current limiting resistor in series). If you have a multimeter that can measure frequency, just measure between ground and the wiper lead and the frequency will equal motor rounds per second.
I did it this way on a school project (see schematic below, ignore all of it but the actuator part with the pot mounted on top of the gear shaft) but instead of a meter on the pot wiper, it fed into a DAC/computer. Worked great!
Registered Member #1805
Joined: Sat Nov 08 2008, 06:29AM
Location:
Posts: 67
I decided to give the magnetic rotation another go, what do you guys think of this? I made this little animation that shows what the electromagnets would look like around the barrel.
If a voltage was constant through all of those coils, do you think it would influence the projectile to spin when it passes through them?
The pieces of steel in the animation are the same length as the projectile.
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.
Inducing spin on coil gun projectiles!
