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  1. C0lson

    3/4" Holes in 3" thick rubber

    I am new to Eng-Tips so pardon me if this is not the correct forum. I must devise a method to drill or punch 3/4" holes through 3" diameter hard rubber spheres (ShoreA durometer ~80.) Fabricating the spheres with the whole in place is not an option. I've tried drilling with hole saws at low rpm...

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