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If so, I think you need a tilt of 54.7 deg.

Arbalest:You mean to tilt the tool and grind flat? Something like a "diamond" tool holder also for square HSS blanks? If so, I think you need a tilt of 54.7 deg.Hugh

Pretty close to what I got: sin(angle) = sqrt(0.5) / sqrt(1.5) (assuming bar has thickness of 1 unit) = 35.26deg: (90 - 35.26 = 54.74).Simon