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Old 05-14-2019, 11:42 AM   #10 (permalink)
freebeard
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That's the reason I don't like fiberglass. Instead of a rasp, use a Nichrome wire. This one (doesn't) work on D-cell batteries.



My parents used this very Lionel transformer to cut Styrofoam in a rig like a jig saw. A coping saw handle would be more portable.



The rasp leaves a shredded surface.
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We are operating at an overall mechanical efficiency of only four percent… Therefore, we find that if we increase the overall mechanical efficiency to only twelve percent we can take care of everybody. That three-fold increase in the overall efficiency can only be accomplished by redesign. – R. Buckminster Fuller

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