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

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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@earthlink.net
 [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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