Tuesday, January 25, 2011

Now that's what I call a heat sink

I finally got the Linistepper driver boards and the parallel port breakout board soldered. The Linisteppers require a large heat sink and this one should hopefully fit the bill- it measures about 7" square by 3" thick. I'm using the Linisteppers to handle the CNC machining using EMCEventually I hope to add another driver board for a four axis milling setup.

Thursday, January 6, 2011

Got a radiator

I obtained a small heater core for use as a radiator for the cooling system for the extruder and the high speed milling spindle. It measures about 9.5" x 6.375" x 2". I modified the heater core by cutting the ends off the tubes and fitting hose barbs to the inlet and outlet. I'm going to run coolant lines to the extruder and spindle using quick disconnect fittings so I can easily swap them. 

After reading multiple discussions on the CNC forum it looks like cooling fans probably will not be necessary since I really do not plan on using anything more than a 1.3kW maximum spindle. I still need to find an inexpensive pump...

Sunday, January 2, 2011

Liquid cooled extruder revisited

I'm finally getting back to working on this- seems like it's been forever! I realized there were some problems with my previous liquid cooled extruder design so I designed a new version. The new extruder has a delrin liner and a removable nozzle similar to my original concept. The heater element is a simple power resistor but I'm going to try a vitreous enamel resistor in a small aluminum block as well. 
power resistor version

enamel resistor version