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 #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
Does anyone know how well(or disastrously) the machining of a ferrite core would go using a carbide end mill? I've tried sanding and fringing them before, and to some degree it worked, but the nature of such techniques are crude and inaccurate. I think I'll try to mill out the air gap with my end mill, but not if it's going to shred my bit
If anything its going to be a spark show. Any points? I would just find some machining forum or something, but I don't think most people other than ee's and magnetics experts know much about the material.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
I've seen machinable ceramics advertised, but then as you say, that's more mechanical than ee material.
"Mill out the airgap"? Does that mean put a gap into a flush core, or make a gapped core flush?
Either way, you might be better off with the grinding route. Get a SiC wheel ("Green Grit" in some juristictions) rather than Alli oxide, and rig up a holder for the core, or a holder for a light weight spindle, so you can manouvre the core and wheel with some precision. I bolted my grinding spindle into a table saw, bath-sealanted my cores to a flat board, and then passed them over repeatedly, removing packing as I approached the thickness. Note that ordinary printer paper stock is about 100um thick, and Rizlas are 1 thou.
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
Definitely go with the grinding wheel. One thing I've noticed when doing this my self was that the outer surface was noticeably harder than the inside.
Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
2Spoons wrote ...
Definitely go with the grinding wheel. One thing I've noticed when doing this my self was that the outer surface was noticeably harder than the inside.
Yes, from my experienced with a core and a dremmel cuttoff wheel, I can second that. It doesn't matter so muh anymore because the guy at the recycling center let my friend and I sit in the box with all the tvs and gather flybacks XD. I found 4 that where gapped with plastic shunts on both sides, so it's not much of an issue anymore. Plus I found a good lot of huge heatsinks from an old Sony projector!
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.
Machinability of ferrite materials
