Linear Module LM3/LM4
RACO’s LM Linear Modules are lightweight positioning elements, which can be easily configured into a wide variety of multiple axis motion systems. Possible configurations include single axis driven / idler, parallel linked single axis, XY and XYZ systems. The LM is engineered for carriage speeds up to 200 inches per second, single module load capacities of up to 800 lbs. and a stroke range of approximately 20 feet with a single extrusion.
| LM3 | LM4 | ||
| Repeatability +/-0.003" | x | x | |
| Temperature Range -5 to +185 F | x | x | |
| Coefficient of Friction 0.009 – 0.02 | x | x | |
| Efficiency 95% | x | x | |
| Materials: | |||
| Structure 6063 Aluminum Alloy | x | x | |
| Belt Polyurethane / steel reinforced | x | x | |
| Wheel Treads Delrin 150 SA | x | x | |
| Link shaft Solid or Tubular | x | x | |
| Weights for complete LM- Modules: | |||
| Un-driven Idler | |||
| N type | 6.82 lb +0.317 lb / in | 12.0 lb +0.6 lb / in | |
| L type | 9.42 lb +0.317 lb / in | 16.88 lb +0.6 lb / in | |
| X type | 13.2 lb +0.317 lb / in | 23.5 lb +0.6 lb / in | |
| Single LM Drive | |||
| N type | 7.41 lb +0.325 lb / in | 14.1 lb + 0.617 lb / in | |
| L type | 9.01 lb +0.325 lb / in | 16.8 lb + 0.617 lb / in | |
| X type | 11.41 lb +0.325 lb / in | 25.4 lb + 0.617 lb / in | |
| Moving Beam | |||
| Z Drive | 17.40 lb +0.325 lb / in | 28.7 lb + 0.617 lb / in | |
| Sub-components | |||
| Link Shaft Assembly | 4.32 lb + 0.125 lb / inch | 4.32 lb + 0.125 lb / inch | |
| Belt | 0.09 lb / ft | 0.128 lb / in | |
| Profile | 0.317 lb / in | 0.6 lb / in | |
| Profile Tolerances: | |||
| Flatness | 0.012" 0.016" | 0.012" 0.016" | |
| Straightness | .0125" per ft | .0125" per ft | |
| Twist | 0.25 degree per ft (3 degree max.) | 0.25 degree per ft (3 degree max.) | |
| Max. stroke – single extrusion: | |||
| (1" allowance for switches) | |||
| N | 238" | 236" | |
| L | 235" | 233" | |
| X | 230" | 228" | |
| Z Beam | 36" | 48" | |
| Drive Pitch | 7.48 in / rev | 10.232 in / rev | |
| Pulley Diameter | 2.38" | 3.258" | |
| Traction Force Limits | 562 lb | 843 lb | |
| Belt Tension (torque setting): | |||
| 0" to 120" stroke | 90 lb ( 6 lb-in ) | 110 lb ( 9 lb-in ) | |
| 120" to 240" stroke | 180 lb ( 12 lb-in ) | 210 lb ( 15 lb-in ) | |
| 240" to 360" stroke | 225 lb ( 16 lb-in ) | 260 lb ( 20 lb-in ) | |
| Reflected Inertia: | |||
| Pulley | 1.2 lb-in2 | 1.2 lb-in2 | |
| Carriage | |||
| N | 5 lb-in2 | 14.3 lb-in2 | |
| L | 7.3 lb-in2 | 21.2 lb-in2 | |
| X | 10.8 lb-in2 | 30.9 lb-in2 | |
| Link Shaft Assembly | 3.44 + (0.125) * length lb-in2 | 3.44 + (0.125) * length lb-in2 |