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 #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Ive been figuring on the best way to replace Styrofoam and Balsa wood from my drones.
First, the balsa wood would warp by itself, and of course shred apart in just normal storage. When fiberglassed, it was heavy an flexable. Second, using a Styrofoam table, the Fiber glass or carbon would peel from the edge, and epoxy wont stick to Depron at all.
So, needing a strong but light material, and having a machine to do the tedious work, I went back to thinking about "I" beams and second moment inertia. This drove me towards the trusty honeycomb shear web. I couldn't afford the typical material sold on Ebay. So I went at it my self and here are the results.
Registered Member #509
Joined: Sat Feb 10 2007, 07:02AM
Location:
Posts: 329
Finally got around to fixing my printer after being down for a while, and much to my pleasure the local microcenter has a good selection of filaments. Long story short, PETG filament is pretty awesome stuff, very good inter-layer bonding. Check out some video reviews for an idea of how it behaves. as an example
Obviously the Taulman stuff in the video will be top quality but even the cheaper ($24/kg) stuff I picked up is quite strong. Stiff, but with just enough flex to be tough and not have a brittle failure. In a thin sheet (3 layers) its quite flexible and feels pretty strong. Ive had luck with it on a kapton bed as long as you keep the first layer close and the bed around the glass transistion temperature (1st 3 layer 90C, then ease off to 80C for my Flashforge creator X)
As far as gluing, still not as easy as ABS, I'm seeing people suggesting IPS weld-on variants, havent glued any myself. Eastman (resin OEM) suggests a few different solvents, but most of them qualify as either "The good shit" or "Nasty stuff" depending on your perspective.
MEK, Tetrahydrofuran, cyclohexanone, Methylene Chloride, Ethyl Acetate. IPS weldon #3, and #16 both look heavy on the methylene chloride, with #3 being mostly straight MCL, and #16 having MCL, MEK, and methyl acetate, both with a hint of super-glue for good measure.
Registered Member #2529
Joined: Thu Dec 10 2009, 02:43AM
Location:
Posts: 600
Patrick wrote ...
First, the balsa wood would warp by itself, and of course shred apart in just normal storage. When fiberglassed, it was heavy an flexable.
Did you try laminating it, like plywood? Plywood is very dimensionally stable.
I did wonder whether you could get laser cut balsa sheets with hexagonal cutouts, then you could layer them at 60 degrees, obviously haven't tried that, sounds good on paper at the very least. Could well be insanely light, rigid, stable and strong.
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.
Honeycomb for Structural Purposes.
