>
> 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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