Thursday, January 18, 2007
2 amp extruder barrel complete
I wondered why I was able to do the winding so well and finally remembered that when I was about 4 years old my father, an avid fisherman, taught me how to set guide loops on new fishing rods with thread and then set the thread windings with fingernail polish.
I've loaded most of the heating capacity up by the orifice and only a little further back. I also made the extruder barrel a bit longer. The theory is that the rear end of the extruder barrel will stay cooler and not cause the filament to melt at the entry to the barrel, something I'd seen happening when I tried to extrude polycapralactone at too high a temperature.
This evening or this weekend I plan to trim the threaded rod for the polymer pump and then assemble the Mk 2.1 for testing.
also... new tools arrived today! reciprocating saw, vice grips, and a nice digital caliper ($15)
i <3 harbor freight!
What I bought is black Krylon BBQ & Stove Paint in a spray can. It's rated up to 1200 degrees F.
There doesn't seem to be anything complicated about getting it, unlike a lot of the stuff we have to track down.
This minor detail may not matter much. One could always wrap an extruder that is too cold in a layer of aluminium foil after painting.
I suppose it could be tested with an IR diode and sensor pair, if it's very reflective compared to some other surfaces... :)
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