Mechanical Processing Technician: How to Machine Parts with Higher Precision? Fellow practitioners, come and share your insights.
1. Pre-Operation Safety Checks
Inspect circuit/switch buttons for normal function, verify spindle concentricity, and check for collision-induced axial deviation.
2. Spindle Concentricity & Precision Inspection
Use a dial indicator (0.001–0.005 mm accuracy; our company uses Mitutoyo) for testing.
3. Spindle Distance Error Measurement
Handle the dial indicator carefully (avoid head collisions). Attach its magnetic base to the magnetic table, adjust the head direction, and gently press against the spindle to measure.
4. Concentricity Inspection Operation
Touch the spindle with the indicator head (slight pointer rotation is normal). Set the pointer to a fixed reading, turn on the grinder at low speed. Steady pointer = intact spindle; left-right swing = faulty (call professional maintenance).
5. Grinder Use & Wheel Selection
After passing inspections, select a grinding wheel (46K/60K/80K...100K+) based on the part's machining requirements.
6. Grinding Wheel Selection Principles
Machine per drawings. Common materials: S45/S50/P20/NAK80 (soft) and DH31/SKD61/S136 (hard). Reserve machining allowance (e.g., 0.5 mm for each dimension). Use 46K wheel for rough grinding (coarse grains for excess material removal).
7. Machining Allowance & Finishing
- Soft materials (20–40 HRC): Easy to machine, low heat, no deformation—suitable for novices.
- Hard materials (52–54 HRC): Control heat during rough grinding (cool with alcohol/heat transfer to avoid dimensional shrinkage). Leave a small allowance for precision finishing to meet drawing requirements.