Monday, June 11, 2007
Stepper Board Videos!
Stepper Motor Action from Zach 'Iowa' Hoeken on Vimeo
I measured them at about >150 Celsius. They seemed quite happy to run that hot without problems. The only problem with doing that is that if you mistakenly touch the chip to see if it's warm you burn your fingerprint off.
I blogged that quite some time ago. I may have recorded the temperature then, too.
I generally pick heatsinks to run about 60C. It's quite conservative but I don't like to burn my fingers!
Strangely the data sheet quotes max dissipation as 25W with case at 75C but junction case is 3C/W so that would be 150C junction which is 30C above the junction limit, am I missing something here?
Of course, that still leaves the question of what to use for corner brackets, if you're going to meld a reprap with an oven.
What about attaching a CPU coolant fan to one?
What about attaching a CPU water jacket to one? In the latter case, you could run the tubing to the extruder, but you'd still need a heating element...that is unless you want to idle your motors for several minutes before you could start melting plastic.
Also, the tubes would lose some heat, and you'd have to make room for all of them. Two tubes per motor, or perhaps just one axis, (the one that moves most of the time. Maybe x and y) Either two tubes, or all the tubes, for the extruder.
I have a feeling it'd be less effective than complex, however.
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