3-2-1 locating principle, modular fixturing and workholding methods for CNC
3 pins on primary datum (Z), 2 on secondary (Y), 1 on tertiary (X). Constrains 6 DOF. For cylinders: V-block + end stop.
DIN 6300 base plates, locating elements, clamps. Reconfigurable. T-slot and dowel pin. Accuracy ±0.01-0.02mm.
| Type | Force | Best For |
|---|---|---|
| Vise | 5-30 kN | Prismatic parts |
| Hydraulic | 10-100 kN | High-volume, automated |
| Magnetic | 5-50 kN | Thin parts, grinding |
| Vacuum | 0.7-0.9 bar | Non-magnetic thin |
Locate from machined surfaces. Support near cutting forces. Clamp force 2-3× cutting force. Chip clearance: 3-5mm.