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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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 Posted: Sun Mar 18, 2012 9:12 am Post subject: Materials notes: |
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Bob is right-on regarding Bakelite. Nylon, acrylic, or glass-epoxy will usually do.
When I have time I would like to write an article about the fine art of choosing materials. This is not as simple as it sounds, but you get a whole lot smarter if your choices are limited.
Some materials become fashionably and then fade: Viz--Teflon. It was once the wunderstuff, now engineers would furrow their brows if one uses it. The DC-10 that crashed in Chicago years ago had some teflon bearings. The investigating engineer commented, "There's no place for teflon on an aircraft..." There are only two or three legitimate uses for it, and that's it....and forget it because the thing you're designing isn't one of them.
There are many people who can hardly believe they build airplanes from wood! When I was in school I build camera lensboards from paper and glue and india ink. They were still in service until I got rid of all my film-based cameras.
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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net |
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rd2(at)dejazzd.com
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| Posted: Sun Mar 18, 2012 9:41 am Post subject: Materials notes: |
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Eric,
There are STC's I've come across for teflon bushings for controls (e.g. for the yoke stem). Just curious if there could be any material problems and why.
Rumen
---- "Eric M. Jones" <emjones(at)charter.net> wrote:
| Quote: |
Bob is right-on regarding Bakelite. Nylon, acrylic, or glass-epoxy will usually do.
When I have time I would like to write an article about the fine art of choosing materials. This is not as simple as it sounds, but you get a whole lot smarter if your choices are limited.
Some materials become fashionably and then fade: Viz--Teflon. It was once the wunderstuff, now engineers would furrow their brows if one uses it. The DC-10 that crashed in Chicago years ago had some teflon bearings. The investigating engineer commented, "There's no place for teflon on an aircraft..." There are only two or three legitimate uses for it, and that's it....and forget it because the thing you're designing isn't one of them.
There are many people who can hardly believe they build airplanes from wood! When I was in school I build camera lensboards from paper and glue and india ink. They were still in service until I got rid of all my film-based cameras.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=368817#368817
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nuckolls.bob(at)aeroelect
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| Posted: Sun Mar 18, 2012 12:43 pm Post subject: Materials notes: |
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At 12:12 PM 3/18/2012, you wrote:
--> AeroElectric-List message posted by: "Eric M. Jones" <emjones(at)charter.net>
When I have time I would like to write an article about the fine art of choosing materials. This is not as simple as it sounds, but you get a whole lot smarter if your choices are limited.
I would be pleased to mirror its publication on aeroelectric.com . . . Some materials become fashionably and then fade: Viz--Teflon. It was once the wunderstuff, now engineers would furrow their brows if one uses it. The DC-10 that crashed in Chicago years ago had some teflon bearings. The investigating engineer commented, "There's no place for teflon on an aircraft..." There are only two or three legitimate uses for it, and that's it....and forget it because the thing you're designing isn't one of them.
Some members on the List may recall some discussions about Teflon insulated wire here on the List about 9 years ago. Use the search engine on the front page at AeroElectric.com to find references to Teflon.
It's a neat material that is unparalleled for a few applications . . . but as you've stated . . . very few.
Bob . . . [quote][b]
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jimw_btg(at)earthlink.net
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| Posted: Sun Mar 18, 2012 3:26 pm Post subject: Materials notes: |
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Some of the best non-metallic bearing materials are made by IGUS. I have
used then in many industrial designs and they are very economical in small
qty.
Jim Wickert
Vision #159
Tel 920-467-0219
Cell 920-912-1014
Vision Some will have it some will not!!!
--
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millner(at)me.com
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| Posted: Sun Mar 18, 2012 4:12 pm Post subject: Materials notes: |
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IGUS? What's that?
Paul
Sent from my iPhone
On Mar 18, 2012, at 4:25 PM, Jim Wickert <jimw_btg(at)earthlink.net> wrote:
[quote]
Some of the best non-metallic bearing materials are made by IGUS. I have
used then in many industrial designs and they are very economical in small
qty.
Jim Wickert
Vision #159
Tel 920-467-0219
Cell 920-912-1014
Vision Some will have it some will not!!!
--
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jimw_btg(at)earthlink.net
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| Posted: Sun Mar 18, 2012 5:43 pm Post subject: Materials notes: |
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Hello Paul,
IGUS is a non metallic bearing manufacturer the produces everything from
bushings to bearings, rails etc. I have been using them on applications
from my Engineering company. Extremely great products and people to work
with, very price competitive and a product for just about every application.
Right now I have several projects taking place one a Government Hydrofoil
that will have a compensating or rather changing shape during operation
relative to load, speed, etc. Salt water application very abusive
atmosphere. The product has tested out fantastic, another project extremely
high speed pharm packaging machine, high speed, high load rapid direction
changes. Another is the New Side Stick Dual Control for the Vision EX
aircraft.
I have been using them for over 15 years now.
Here is their website.
http://www.igus.com/default.asp?WT.srch=1&WT.mc_id=gadUS75&c=US&L=en&gclid=C
M6Sl5Po8a4CFcVdTAodIx_OIA
Any additional question please feel free to contact me anytime, I can help
and have an account with them.
Jim Wickert
Vision #159
Tel 920-467-0219
Cell 920-912-1014
"Vision some will have it some will not"
--
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dsvs(at)ca.rr.com
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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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| Posted: Mon Mar 19, 2012 5:18 am Post subject: Re: Materials notes: |
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Rumen, et al.
Teflon "cold flows", so if you squeeze it, it will change its shape. But the
main issue is that other materials have taken the jobs that Teflon once
presumed to do. There are very few jobs where Teflon is still king:
Plumbers tape,
Some insulation and dielectrics,
Some few high-voltage parts,
Some chemically-resistant lab wear and tubing.
They used to use Teflon for artificial joints...but they all failed.
Teflon bearings and o-rings had their day, but Nylon (or one of its hundreds of its cousins like Celcon, Delrin, etc.) now fills those jobs.
Oh yes, there are many modified TFE polymers, too. ETFE is Tefzel, but I am referring to the white TFE stuff here.
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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net |
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nuckolls.bob(at)aeroelect
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| Posted: Mon Mar 19, 2012 5:24 am Post subject: Materials notes: |
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I have been using them for over 15 years now.
Here is their website.
http://www.igus.com
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| Quote: | Any additional question please feel free to contact me anytime, I can help
and have an account with them.
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Interesting find! I've forwarded the
link to my compadres in the grey matter
consortium.
Bob . . .
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