Rail Dimensional Drawing BM SR 20
Carriage Dimensional Drawing BM WR 20
Rigidity Diagram and Load Directions BM WR 20
Rail Types BM SR 20
Material: stainless steel.
Rail Type Description:
- ND = Standard type, top mounting, fully hardened
- NUD = Bottom tapped hole type, fully hardened
Rail Specifications BM SR 20
| Parameter | BM SR 20-ND | BM SR 20-NUD |
| Rail Width B1 (mm) | 20 | 20 |
| Rail Height J1 (mm) | 19 | 19 |
| Max Single Piece Length L3 (mm) | 3000 | 3000 |
| Mounting Hole Pitch L4 (mm) | 60 | 60 |
| First/Last Hole Position L5/L10 (mm) | 28.5 | 28.5 |
| Weight per Meter (kg/m) | 2.2 | 2.3 |
Carriage Specifications BM WR 20
| Parameter | BM WR 20-A | BM WR 20-B | BM WR 20-C | BM WR 20-D |
| System Height A (mm) | 30 | 30 | 30 | 30 |
| Carriage Width B (mm) | 63 | 63 | 44 | 44 |
| Reference Surface Distance B2 (mm) | 21.5 | 21.5 | 12 | 12 |
| Front Center Lube Port Position C1 (mm) | 5.2 | 5.2 | 5.2 | 5.2 |
| Side Lube Port Position C3 (mm) | 5.2 | 5.2 | 5.2 | 5.2 |
| Side Lube Port Position (2nd) C4 (mm) | 10.8 | 18.8 | 12.8 | 13.8 |
| Top Lube Port Position C7 (mm) | 10.3 | 18.3 | 12.3 | 13.3 |
| Carriage Height J (mm) | 25.5 | 25.5 | 25.5 | 25.5 |
| Carriage Length L (mm) | 72.5 | 88.5 | 72.5 | 88.5 |
| Outer Mounting Hole Pitch L1 (mm) | 40 | 40 | 36 | 50 |
| Inner Mounting Hole Pitch L2 (mm) | 35 | 35 | — | — |
| Body Length L6 (mm) | 51.5 | 65.5 | 49.5 | 65.5 |
| Lateral Mounting Hole Pitch N (mm) | 53 | 53 | 32 | 32 |
| Reference Surface Height O (mm) | 8.5 | 8.5 | 8.5 | 8.5 |
Capacities and Weights
| Parameter | BM WR 20-A | BM WR 20-B | BM WR 20-C | BM WR 20-D |
| Static Load Capacity C₀ (N) | 26690 | 34935 | 26690 | 34935 |
| Dynamic Load Capacity C₁₀₀ (N) | 12240 | 14790 | 12240 | 14790 |
| Static Cross Moment Capacity M₀Q (Nm) | 317 | 417 | 317 | 417 |
| Static Longitudinal Moment Capacity M₀L (Nm) | 248 | 421 | 248 | 421 |
| Dynamic Cross Moment Capacity MQ (Nm) | 145 | 175 | 145 | 175 |
| Dynamic Longitudinal Moment Capacity ML (Nm) | 114 | 177 | 114 | 177 |
| Carriage Weight (kg) | 0.5 | 0.6 | 0.4 | 0.5 |
Load Rating Description
- C0 = Static load capacity
- C100 = Dynamic load capacity - 100km travel life
- M0Q / MQ = Cross moment
- M0L / ML = Longitudinal moment
