Monday, September 17, 2007


Finishing the extruder barrel

I finished up the painting of the extruder barrel about dark yesterday and let the six coats cure most of today. Late this afternoon I designed a 2 amp heating coil of #32 glass fibre and Teflon insulated Nichrome 80 wire. It is rated at 0.32 ohms/foot. Using Ohm's law...

R = V/I = 11.5v (measured off of the power transistor)/2 amps = 5.75 ohms

LENGTH (inches) = (5.75 ohms/10.32 ohms/ft)(12 inches/ft) = 6.686 inches

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