| 摘要 |
A fixture for holding a spade drill on a reciprocable grinder table during the sharpening thereof comprises a base for resting on the grinder table, a rocker supported on the base and pivotable to various fixed positions for providing a selected dip angle, and means for supporting the spade drill on the upper side of the rocker in a predetermined angular relation with respect to the horizontal table surface, such angular relation providing the rake angle for enabling grinding the top-rake flat of the drill. The base can be tilted to rest on a rear support surface which is disposed in a predetermined angular relation to enable grinding of the clearance portion of the spade drill at a proper angle. Selection of skew angle is also provided as a feature. The fixture can accommodate an entire series of spade drills to be ground to various dimensional specifications. |
