Homebrew PCBs

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
>
>
>