Comments on: Heater barrel failures http://www.CodeErrors.com/blog/a/117/heater-barrel-failures Nick McCoy Sat, 21 Aug 2010 04:16:01 +0000 http://wordpress.org/?v=2.8.4 hourly 1 By: mccoyn http://www.CodeErrors.com/blog/a/117/heater-barrel-failures/comment-page-1#comment-463 mccoyn Fri, 01 Jan 2010 15:58:31 +0000 http://www.CodeErrors.com/blog/?p=117#comment-463 What is the resistance of your heater? I don't think my 8 Ohm heater could maintain the temperature if there was a heat sink cooling one end What is the resistance of your heater? I don’t think my 8 Ohm heater could maintain the temperature if there was a heat sink cooling one end

]]> By: Frank Davies http://www.CodeErrors.com/blog/a/117/heater-barrel-failures/comment-page-1#comment-462 Frank Davies Fri, 01 Jan 2010 05:04:43 +0000 http://www.CodeErrors.com/blog/?p=117#comment-462 I use a hollow threaded stainless steel tube as you appear to be doing. I do not have it screwed into a PTFE barrel at the top. I have it attached to an aluminum heatsink so that one end is held hot by the heater, and the other end cooled by the heatsink. This way the temperature drop is in the tube wall, and I do not need any PTFE. I used to use a TO-220 resistor. The first one worked very well (100 hours). The second and third were erratic (resistance would increase when it got hot, like there was a crack inside). I now use one of those Dale resistors with an aluminum body screwed to a little plate like you have. This heated is working very reliably. Frank Davies I use a hollow threaded stainless steel tube as you appear to be doing. I do not have it screwed into a PTFE barrel at the top. I have it attached to an aluminum heatsink so that one end is held hot by the heater, and the other end cooled by the heatsink. This way the temperature drop is in the tube wall, and I do not need any PTFE. I used to use a TO-220 resistor. The first one worked very well (100 hours). The second and third were erratic (resistance would increase when it got hot, like there was a crack inside). I now use one of those Dale resistors with an aluminum body screwed to a little plate like you have. This heated is working very reliably.

Frank Davies

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