The selection of the accuracy grade of a dual-axis linear guide depends on the user's actual application. The general principle is that for applications with large guide rail specifications, heavy loads, impacts, and high precision, a higher preload grade can be selected, and vice versa.
Dual-axis linear guides are made of aluminum profiles and mainly consist of guide rails, optical shafts, and bearing components. The repeatability is 0.03mm, but the straightness is slightly worse. The longer the guide rail, the worse the straightness. It is less straight than ball bearings because it is made of aluminum profiles. However, it is lightweight and more suitable for use in light-load equipment.
Standard precision is sufficient for most requirements; for higher precision, choose H grade; P grade is commonly used for CNC machine tools and similar equipment; and SP (super precision) and UP (top precision) are recommended for other ultra-precision machinery. The latter three grades require stringent installation and usage conditions to demonstrate their performance. Guide rail precision grades are divided into (parallelism, using a 100mm guide rail as an example): Standard (no marking/C) 5μm, High (H) 3μm, Precision (P) 2μm, Super Precision (SP) 1.5μm, and Ultra-Super Precision (UP) 1μm.
Linear guide rail accuracy is classified according to parallelism over a distance of 100mm, and can be divided into: ordinary grade (no marking/C) 5μm, high grade (H) 3μm, precision grade (P) 2μm, ultra-precision grade (SP) 1.5μm, and ultra-ultra-precision grade (UP) 1μm.
Dual-axis linear guides are made of aluminum profiles and mainly consist of guide rails, optical shafts, and bearing components. The repeatability is 0.03mm, but the straightness is slightly worse. The longer the guide rail, the worse the straightness. It is less straight than ball linear guides because it is made of aluminum profiles. However, it is lightweight and more suitable for use in equipment with light loads and low precision requirements.
