Originally Posted by
Dan S
I just finished reading this entire thread.
Would filling steel tubing with epoxy and lead shot produce a rigid machine that doesn’t ring?
I wat thinking something like 2”x6”x1/4” tube would create really stiff uprights etc, and then filling them with epoxy and small lead show would serve to dampen any vibrations.
Opinions?
Welcome and well done Dan. If only everyone would follow your example.
I'm not certain, but I would suspect that any mix of sand/gravel/epoxy would give you a better absorber. Though the lead shot has a higher density, and the greater difference in density between the epoxy and the lead is good, you will only get a ~62% maximum packing if you use only one size of shot.
The variable size of the ag mix will both broaden the frequency spectrum absorbed and the much higher packing with the right mix will increase the absorption by virtue of increasing the number of internal reflections/refractions that occur each time the sound waves pass from one medium(the epoxy) into another(the aggregate).
Regards
John
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