Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

 

Not epoxy glass, but making epoxy carbonm fibre gears. New end plates to be made from laminated (2 layers FR4, without copper.)
Just now making the gear cutter blanks, not difficult if you have a lathe and a mill. A £10 ($14) laminator being butchered. Arduino temperature and synchronous motor speed control. The total cost will be about £25, less my time.

Malcolm

I don't suffer from insanity I enjoy it!
Mene, mene, tekel, upharsin
The writing is on the wall.
Ha-ktovet al ha-kir

--------------------------------------------
On Mon, 12/26/16, Rob roomberg@... [Homebrew_PCBs] <Homebrew_PCBs@yahoogroups.com> wrote:

Subject: [Homebrew_PCBs] Re: Metal laminator gears..... anybody making epoxy gears?
To: Homebrew_PCBs@yahoogroups.com
Date: Monday, December 26, 2016, 11:48 AM


 












Anybody making epoxy composite gears?

Sure would like to see an example of that some day.







On 12/26/2016 03:34 AM,
craigl2@...
[Homebrew_PCBs] wrote:


 


Forget
about the melting point. You need to be
looking at the
heat deflection temperature. Most of the
plastics usable
in this temperature range are very expensive,
Teflon
(PTFE) is probably the cheapest. A high
temperature epoxy
(such as EpoxAcast 670 HT from Smooth-On) with
the
addition of glass fibers or powdered metal
fillers to
further increase the heat resistance might
also work.



Craig




---In Homebrew_PCBs@yahoogroups.com,
<roomberg@...>
wrote :




There are two issues
here.

First is the folks who want to change the
speed of the
rollers to
slow it down to do

just one pass.

The laminators that have two sizes of
gears can have
them swapped
to have the bigger where the smaller

was and it will slow down.

BUT

if your laminator does not reach 340
degrees then
swapping gears
does not get you anywhere.



Issue two is US melting nylon plastic
gears when we
raise the 290
degree standard photo pouch

laminators to 340 degrees... and higher
370 degrees to
match toner
melt temperatures.



FROM WIKI:

 The 428 °F (220 °C) melting point of
nylon 6 is lower
than the
509 °F (265 °C) melting point of nylon
66.



SO

here lies our problem.

Cheap gear motors pushing cheap gears are
fine in a
laminator that
is supposed to never reach

300 degrees.

And then

we cook them up with a laminator hack

and

if we go a little too far.... melt our
gears:



http://www.learnmorsecode.com/laminator/royalmods9.jpg



and nobody has been able to identify the
correct metal
gears to
replace some of our gears.



So look into making them:



http://www.learnmorsecode.com/laminator/gearteeth.gif




























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