Re: 3D Printing

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Ron Thompson <ron@...> wrote:
>
> On 12/19/2012 2:02 AM, Tony Smith wrote:
> > DIY temperature control isn't worth the effort these days. I mean:
> > https://www.sparkfun.com/products/306, sheesh.
> >
> > Tony
> In keeping with the subject, the Reprap extruder and the heated build
> platform don't even use PID. I expected PWM modulation, but it is just
> sensed with a 100K thermistor and turned off and on.
> The Arduino does it, but a simple dedicated circuit would do it just as
> well.
> It uses a cheap MOSFET as a current amplifier (can be thought of as a
> solid state relay) to switch the power using the small logic signal from
> the Arduino.
> I have seen electric skillets modified to use as heated build beds.
>
> --
>
>
> Ron Thompson
> On the Beautiful Florida Space Coast, right beside the Kennedy Space Center, USA
>
> Think, Draw, Print. 3D printers ROCK!
>
> http://www.plansandprojects.com/My%20Machines/PrusaMendel2012-1/
>
> http://www.plansandprojects.com My hobby pages are here:
> http://www.plansandprojects.com/My%20Machines/
>
> Visit the castinghobby FAQ:
> http://castinghobbyfaq.bareboogerhost.com/
>