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First, structural characteristics
The main body of the guide rail is a circular arc curve structure, which can realize arc motion at any angle from 0 ° to 360 °
Common forms: arc sliding guide, arc rolling guide, arc linear slide
Drive with slider, roller, rack and pinion or timing belt
It can be spliced into a whole circle in a single section, or it can be made into a small arc to achieve steering and indexing
II. Main types
1. Curved rolling guide
· The ball/roller rolls in the arc raceway, with little friction and smooth movement
· High positioning accuracy, smooth movement, suitable for high speed, light medium load
· Mostly used for precision turntables, indexing mechanisms, and automated production lines
2. Curved sliding guide
· Direct sliding contact of the guide surface, high rigidity and large load
· Good damping, impact resistance, suitable for heavy-duty, low-speed rotating tables
· Common in machine tool rotary table, indexing disc, heavy rotating device
III. Core performance
Arc radius: customizable, common R50~ R2000mm
Movement angle: 0 °~ 360 °, can be operated in sections
Carrying capacity: from light loads of a few kilograms to heavy loads of several tons
Positioning accuracy: ordinary grade ± 0.1mm, precision grade up to ± 0.01mm
High repetitive positioning accuracy, smooth operation without obvious jitter
IV. Materials and processes
Bearing steel GCr15, 45 steel, cast iron HT300
Surface quenching, intermediate frequency quenching, hardness HRC58~ 62
Precision grinding to ensure roundness and surface finish
Application scenarios
· Automatic circular production line, circular assembly line
· Numerical control turntable, indexing plate, rotary table
· Robot seventh axis arc track
· Rotating stations for packaging, testing, and welding equipment
· Arc feed mechanism for machine tools, grinders and milling machines
Advantages
· Realize accurate circular motion, replacing complex multi-axis linkage
· Compact structure saves installation space
· Stable operation and low noise
· Can achieve continuous rotation or indexing positioning
· Wide bearing range, can meet the light load precision to heavy load conditions
VII. Disadvantages
The trajectory is fixed and can only move along a circular arc
The processing difficulty is higher than that of linear guide rails, and the cost is slightly higher
The support structure needs to be strengthened when the radius is large and the load is large
