A precise method for selecting linear modules that balances accuracy, speed, and cost, helping you avoid
common selection pitfalls:
I. First, identify core selection dimensions. Break down your operating requirements into four key metrics to
directly determine the appropriate module type:
Accuracy Requirements: If repeatability accuracy is ≤ ±0.01mm, prioritize ball screw modules; for ultra-pre
cision scenarios requiring ±0.001~±0.005mm, directly select linear motor modules.
Speed and Stroke: For speed requirements >2m/s and stroke exceeding 4m, prioritize synchronous belt mo
dules; for stroke exceeding 10m and heavy loads, choose rack and pinion modules that can be infinitely splic
ed.
Load Capacity: For loads exceeding 500kg or even tons, directly select rack and pinion modules; for medium
to high loads up to 500kg, ball screw modules are perfectly adequate.
Cost Budget: Based on a ball screw module cost of 1x, the synchronous belt module costs only 0.5-0.8x, the
gear and rack module costs 1.5-2x, and the linear motor has the highest cost, reaching 3-5x.
II. Precise Adaptation Scenarios for Four Major Modules
Table: Module Type | Core Adapted Scenarios | Typical Pitfalls to Avoid
Ball Screw | Medium-to-high precision, medium-to-low speed scenarios such as 3C assembly, dispensing,
and testing. Prone to resonance and sagging when the stroke is >3m. Do not force the selection of a long
single screw to avoid high-speed vibration.
Synchronous Belt | Long-distance, high-speed, low-precision scenarios such as logistics handling and large
-size transfer. Do not use in Z-axis vertical load scenarios; belt creep and springback will cause positioning
drift.
Linear Motor | Extremely precise dynamic scenarios such as semiconductors and ultra-high-speed Patch p
anel installation. Must be equipped with a high-performance grating ruler and heat dissipation design; othe
rwise, heat generation and thrust fluctuations will directly ruin performance.
Gear and Rack | Heavy-duty, long-distance scenarios such as laser cutting and heavy-duty machine tools.
Must select a double-thin-plate backlash-eliminating structure; otherwise, backlash will directly affect posi
tioning accuracy. Forced lubrication and noise reduction are also necessary.
III. General Selection Rules
Accuracy ≤ ±0.01mm and speed <1m/s → Prioritize high-performance, cost-effective ball screws. There is
absolutely no need to spend a lot of money on linear motors to avoid performance overkill.
Speed > 2 m/s or acceleration > 2g → A linear motor solution must be evaluated, as the critical speed of the
lead screw simply cannot support such dynamic demands.
Limited budget, long stroke, and accuracy tolerance ≥ ±0.05 mm → A synchronous belt is the optimal solu
tion, requiring no maintenance and saving costs.
