[simpits-tech] to MARV re: RP
Steve Wilson
simpits-tech@simpits.org
Wed, 2 Oct 2002 21:30:54 -0400
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<div><FONT FACE=3D"Arial" SIZE=3D2>Well, when it comes to the knobs -=
you remain our resident expert! :-)</FONT><br></div>
<div> </div>
<FONT FACE=3D"Arial" SIZE=3D2></FONT><div><FONT FACE=3D"Arial"=
SIZE=3D2>The only thing I've realized, though, in the meantime, is=
that I'm scrod when it comes to illuminating my knobs. =
There needs to be a ring around each knob mounting hole to let=
the knob backlighting work, and that is not featured in the Nova=
panels I'm using. </FONT>
I'll have to speak to Peter Cos about that for the next rev of=
his F-16 panels. This is probably not really that big of a=
loss, but it's definitely an FYI for anyone considering=
backlighting their knobs. Part of the prep for=
hacking into my Aimsworth consoles has been to lay out all the=
panels this week for measurements. Damn, Peter did a good=
job on those. <br></div>
<div> </div>
<div>Getting your knob making eagerness into a higher gear,=
Marv. ;-)))) <br></div>
<div> </div>
<div>Steve <br>
<FONT FACE=3D"Arial" SIZE=3D2>--
<br>
Steve Wilson, mafsix@attbi.com on 10/02/2002
<br>
</FONT><br>
<br>
On Wed, 02 Oct 2002 20:36:45 -0400, Marv De Beque wrote:<br>
::::<br>
<FONT COLOR=3D"#000080">:::: Interesting about the lead-free=
pewter.</FONT><br>
<FONT COLOR=3D"#000080">::::</FONT><br>
<FONT COLOR=3D"#000080">:::: I have tried some experiments=
with translucent plastics for</FONT><br>
<FONT COLOR=3D"#000080">:::: light plates and</FONT><br>
<FONT COLOR=3D"#000080">:::: I was very disappointed at the=
performance (almost nil).</FONT><br>
<FONT COLOR=3D"#000080">::::</FONT><br>
<FONT COLOR=3D"#000080">:::: Water clear plastic is the only=
way to go. That is what the</FONT><br>
<FONT COLOR=3D"#000080">:::: knob</FONT><br>
<FONT COLOR=3D"#000080">:::: manufactures use and I am sure=
that they put a lot of science</FONT><br>
<FONT COLOR=3D"#000080">:::: and</FONT><br>
<FONT COLOR=3D"#000080">:::: engineering into the designs.=
So I will take their lead since</FONT><br>
<FONT COLOR=3D"#000080">:::: I don't want</FONT><br>
<FONT COLOR=3D"#000080">:::: to reinvent the wheel (only=
borrow it to make a mold). ;-)</FONT><br>
<FONT COLOR=3D"#000080">::::</FONT><br>
<FONT COLOR=3D"#000080">:::: Marv</FONT><br>
<FONT COLOR=3D"#000080">:::: --</FONT><br>
<FONT COLOR=3D"#000080">::::</FONT><br>
<FONT COLOR=3D"#000080">::::</FONT><br>
<FONT COLOR=3D"#000080">:::: > From: Steve Wilson=
<mafsix@attbi.com></FONT><br>
<FONT COLOR=3D"#000080">:::: > Reply-To:=
simpits-tech@simpits.org</FONT><br>
<FONT COLOR=3D"#000080">:::: > Date: Wed, 2 Oct 2002=
18:24:32 -0400</FONT><br>
<FONT COLOR=3D"#000080">:::: > To:=
<simpits-tech@simpits.org></FONT><br>
<FONT COLOR=3D"#000080">:::: > Subject: Re:=
[simpits-tech] to MARV re: RP</FONT><br>
<FONT COLOR=3D"#000080">:::: ></FONT><br>
<FONT COLOR=3D"#000080">:::: > Lead is toxic.=
Lead-free pewter is not. Different=
pewter</FONT><br>
<FONT COLOR=3D"#000080">:::: alloys have</FONT><br>
<FONT COLOR=3D"#000080">:::: > different strengths,=
and the stronger variants can be used</FONT><br>
<FONT COLOR=3D"#000080">:::: for harness buckles</FONT><br>
<FONT COLOR=3D"#000080">:::: > and the like.=
Strong stuff, especially for knobs and small</FONT><br>
<FONT COLOR=3D"#000080">:::: mechanical parts.</FONT><br>
<FONT COLOR=3D"#000080">:::: ></FONT><br>
<FONT COLOR=3D"#000080">:::: > What you want to cast=
with, Marv, is a translucent white</FONT><br>
<FONT COLOR=3D"#000080">:::: epoxy resin that=
can</FONT><br>
<FONT COLOR=3D"#000080">:::: > be painted, then lit=
from underneath.</FONT><br>
<FONT COLOR=3D"#000080">:::: ></FONT><br>
<FONT COLOR=3D"#000080">:::: > RP would only be good=
for mold masters. Depending on the</FONT><br>
<FONT COLOR=3D"#000080">:::: quality and the</FONT><br>
<FONT COLOR=3D"#000080">:::: > material used,=
perhaps they'd need a bit of a polish, but</FONT><br>
<FONT COLOR=3D"#000080">:::: then they would=
need</FONT><br>
<FONT COLOR=3D"#000080">:::: > to be cast in=
resin.</FONT><br>
<FONT COLOR=3D"#000080">:::: > --</FONT><br>
<FONT COLOR=3D"#000080">:::: > Steve Wilson,=
mafsix@attbi.com on 10/02/2002</FONT><br>
<FONT COLOR=3D"#000080">:::: ></FONT><br>
<FONT COLOR=3D"#000080">:::: ></FONT><br>
<FONT COLOR=3D"#000080">:::: > On Wed, 02 Oct 2002=
18:02:52 -0400, Marv De Beque wrote:</FONT><br>
<FONT COLOR=3D"#000080">:::: > ::::</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: Lead and=
pewter are things to avoid. Not only are</FONT><br>
<FONT COLOR=3D"#000080">:::: they too</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: soft,=
they are</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: very=
toxic materials.</FONT><br>
<FONT COLOR=3D"#000080">:::: > ::::</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: For the=
home shop, two-part epoxies are probably the</FONT><br>
<FONT COLOR=3D"#000080">:::: way to go.</FONT><br>
<FONT COLOR=3D"#000080">:::: > ::::</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: There are=
a lot of good quality silicon molding</FONT><br>
<FONT COLOR=3D"#000080">:::: rubbers that</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: can be=
used to</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: make a=
mold from. That would be my bet.</FONT><br>
<FONT COLOR=3D"#000080">:::: > ::::</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: As for=
making RP parts, they are simply not strong</FONT><br>
<FONT COLOR=3D"#000080">:::: enough for</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: real=
world</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
use.</FONT><br>
<FONT COLOR=3D"#000080">:::: > ::::</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: Where=
they shine is for making example parts to check</FONT><br>
<FONT COLOR=3D"#000080">:::: theory</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: or, if=
high</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: enough=
quality, as masters for making rubber molds.</FONT><br>
<FONT COLOR=3D"#000080">:::: I think</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: the=
latter</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: holds=
some promise. That is where my money is at.</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
--</FONT><br>
<FONT COLOR=3D"#000080">:::: > ::::</FONT><br>
<FONT COLOR=3D"#000080">:::: > ::::</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> From: "Jim K."=
<JimK@sisna.com></FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> Reply-To: simpits-tech@simpits.org</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> Date: Wed, 02 Oct 2002 13:28:09 -0600</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> To: Simpits=
<simpits-tech@simpits.org></FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> Subject: [simpits-tech] to MARV re: RP</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
></FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> Marv,</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> The quality of RP prototypes seems to rely on=
the</FONT><br>
<FONT COLOR=3D"#000080">:::: machine</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: being=
used and</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> what type of RP is being used. There are=
several</FONT><br>
<FONT COLOR=3D"#000080">:::: different</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: RP=
methods and</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> they do produce different results. I think you=
can</FONT><br>
<FONT COLOR=3D"#000080">:::: change</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: the=
quality</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> outcome of a part via your drawing and/or=
the</FONT><br>
<FONT COLOR=3D"#000080">:::: settings in</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: the RP=
machine</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> itself and the way you make the part is critical=
as</FONT><br>
<FONT COLOR=3D"#000080">:::: well.</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: I.E., you=
have</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> to choose the correct orientation of the part=
from</FONT><br>
<FONT COLOR=3D"#000080">:::: which to</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: start.=
I have</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> some RP parts here and the top final surface=
that</FONT><br>
<FONT COLOR=3D"#000080">:::: was</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: generated=
is as</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> smooth as glass but the sides have that=
"grain" to</FONT><br>
<FONT COLOR=3D"#000080">:::: it. I</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: don't=
think FDM</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> parts have this grain to it but I'd have to=
check.</FONT><br>
<FONT COLOR=3D"#000080">:::: I just</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: brought=
this all</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> up as an option.</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
></FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> hmmmmmm, thinking here: What if you made a mold=
of</FONT><br>
<FONT COLOR=3D"#000080">:::: the part</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: via a=
CNC</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> machine and then melted lead or some type=
of</FONT><br>
<FONT COLOR=3D"#000080">:::: plastic into</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: the mold=
to make</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> your own parts???</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
></FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> Jim</FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
></FONT><br>
<FONT COLOR=3D"#000080">:::: > :::: =
> _______________________________________________</FONT>=
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