Start your homebuilt grinder project off with a rock solid tooling arm! 1.5"x1.5" solid aircraft aluminum tooling arm, 20" long. It has 2 threaded holes on the one side & 2 unthreaded holes on the side perpendicular to the threaded holes. The threaded holes are for attaching a D-shape backing plate, the unthreaded holes are for attaching a tool rest. -The front threaded hole is 1.34" from its center to the front edge of the bar, it's tapped 1/2-13 straight through the bar -The second threaded hole is 1.8125" center to center behind the front threaded hole, it's tapped 3/8-16 at least 1" in, enough for the capture bolt -The front unthreaded hole is .66" from its center to the front edge of the bar, it's drilled 3/8" straight through the bar -The second unthreaded hole is 1.7" center to center behind the front hole, it's drilled 3/8" straight through the bar We use these tooling arms on the high quality belt grinders that we manufacture. They work very well with our D-shaped flat platten backing plates & also our tool rests, listed elsewhere. The finish is industrial, we do not paint, polish or anodize these. You can polish them up with a buffing pad if you want a shiny look.
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