Marking-Out & Datum Setup Set up rough castings (up to 25 MT) on the surface plate / marking table using angle plates, V-blocks, jacks andpacking, and establish reference planes and datums for marking. Mark machining lines, centre lines, bore and hole centres, spot faces and reference points accurately fromengineering drawings.Machining Allowance & Casting Soundness Verify that castings carry adequate and even machining allowance on all machined surfaces and will clean upwithin available stock. Detect core shift, mismatch, distortion or insufficient stock, and flag non-conforming castings to foundry /methoding / quality before machining begins.Drawing & GD&T Interpretation Read engineering drawings and interpret dimensions, datums and GD&T to plan the marking scheme.Instruments & Documentation Use and maintain marking instruments - height gauge, surface plate, scriber, squares, protractors, levels,marking media and punches; ensure instruments are within calibration. Record marking observations and allowance reports and communicate marked references clearly to machiningoperators.Coordination & Team Guide and develop junior markers; allocate marking work and check their layouts. Coordinate with the machine shop (boring / VTL / VMC / HMC), planning and quality to keep castings movingand support first-off verification.