On Fri, Aug 9, 2013 at 11:06 AM, Troy Jacobson <t...@thismuch.net> wrote:
> Changing to a thermcouple is a near future project for me, too. The MAX > chip looks better for this application, especially since I'm looking at > nylon and maybe PC printing (300-320C range). > > For this, the AD595 has a couple of issues. First, the output for the > termperature range I'm looking at is 3 to 3.5v, which is over twice the > range of the BBB's ADC. The voltage divider is easy, but by the time I've > added in a safety zone and add something to limit the voltage into the ADC, > it becomes more complex and results in lost resolution. Also, the max chip > can run on 3.3v that the rest of my BBB uses. The AD595 would probably > require something above 5v to measure the temps I'm looking for. > > What I haven't decided upon is where to mount the converter. Can the > thermcouple wire withstand the repetitive motion if the extruder were to > move relative to the converter (on the X and Z axis), or should it be > mounted near the extruder so that the thermocouple wire doesn't get flexed > at all? > You should use thermocouple extension wire rather than thermocouple wire in between the thermocouple and your convertor. Thermocouple wire is solid, not braided, and generally won't stand up well to repeated flexing. McMaster-Carr carries both thermocouple wire and thermocouple extension wire. Mark ------------------------------------------------------------------------------ Get 100% visibility into Java/.NET code with AppDynamics Lite! It's a free troubleshooting tool designed for production. Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
