The correct orientation for the keyway slot in a 3PDT is

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As illustrated in the figure, it is possible to execute a keyway inside a workpiece, even without a relief groove, using the REV BROACHING TOOL Broac

Design of Square Key and Keyway Stress, Shear and Torque Equations and Calculator Tight Fit Key Key slot Ks = Ka Kd Kf Slide Fit Key Key A Key is used on a shaft keyway to retain mechanical power transmission components such as gear drives and pulleys to transmit power

fairy garden slot png keyway tolerances define the acceptable variation in the dimensions of the keyway slot, crucial for transmitting torque between shafts and components  B5032 high precision keyway slotting machine suitable for key slot,spline,blind hole,internal keyway processing Specification Specification, B5032 Max