GENERAL CATALOGUE81. Diamond plate for glass surface grinding. 81. SAFETY IN GRINDING. General rules. 82. Grinding on portable grinding machines. 83. Safety guards. 83.portable surface grinding machine,Portable Grinder Operating ProceduresLike all power tools, portable grinders can present . "internal grinding" is defined as "the precision grinding of the inside surface of the hole in a work piece.ANSI B7.1 -4 - Jowitt & Rodgersguards for use with cutting-off wheels on portable electric grinders. A. B. A. B. 1/4 inch or ... guards used on surface grinding machines where grinding is done.
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