General Catalog - NB - #29

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LINEAR SYSTEM Eng-39 Eng-40 LUBRICATION The objective of lubrication includes the reduction of friction among the rolling elements as well as between the rolling elements and the raceway, prevention of sintering, reduction of wear, and the prevention of rust by forming a film over the surfaces. To maximize the performance of a linear system, the lubricant type and a lubrication method appropriate for the operating environment should be selected. There are two types of lubrication; oil lubrication and grease lubrication. For oil lubrication, turbine oil conforming to ISO standard VG32 to 68 is recommended. For grease lubrication, lithium soap based grease No.2 is recommended. For slide bush and some other products, anti-rust oil that does not adversely affect the lubricant is applied prior to shipment. Please apply lubricant before using these products. (see Table 1-37) Products with raceway grooves, such as slide guide, are delivered pre-lubricated with grease for immediate use. Please relubricate with a similar type of grease periodically depending on the operating conditions. The recommended relubrication period is about 6 months or 1,000km of travel distance under normal conditions. Table 1-38 Main Property appearance base oil kinematic viscosity of base oil (mm2/s, 40�Ž ) thickening agent mixture viscosity drop point (�Ž ) copper plate corrosion (100�Ž , 24hrs) evaporation (mass%) oil separation (mass% 100�Ž , 24hrs) oxidation stability (MPa99�Ž , 100hrs) bearing corrosion prevention (52�Ž , 48hrs) operating temperature range (�Ž ) KGU Grease light brown synthetic oil and refined oil mixed approx. 85 urea 246 250 or higher passed 0.61 (150�Ž 22h) 0.1 0.015 passed -20�`150 KGL Grease light yellowish-white synthetic oil and refined oil mixed 32 lithium soap 237 201 passed 0.8 (99�Ž 22h) 0.9 0.04 passed -20�`120 item grease name 1 0 10 20 30 40 50 time 60 70 80 90 100 10 100 1000 10000 amount (per 1 CF/10 min.) commercially available lithium-type grease commercially available fluorine-type grease KGU grease KGL grease Figure 1-19 Dust Level Measurement Data Amount of Dust Generated measurement conditions / work: SEBS9B; stroke: 200 mm; velocity: 700 mm/s airflow: 3m3/min; particle diameter: 0.3ìm or larger 100 200 300 400 500 600 velocity (mm/s) 700 800 900 1000 1100 5 10 15 20 dynamic frictional resistance (N) clean grease A by another company clean grease B by another company fluorine-type grease KGL Grease KGU Grease Figure 1-20 Dynamic Frictional Resistance Measurement Data Dynamic Frictional Resistance of Low Dust Generation Greases SGL15TE without seals, normal preload, no load, grease volume: 1cc NB provides the following optional greases. Please select one in accordance with the use conditions of your linear system. �œKGL Grease (Low Dust Generation Grease) KGL Grease has an excellent property of low dust generation with a lithium-type thickening agent used. It is ideal for use in a clean room. �œKGU Grease (Low Dust Generation Grease) With urea-type thickening agent used, KGU Grease has features including a superior low dust generation property and the reduced dynamic frictional resistance during low-speed operation. type Slide Guide Ball Spline Rotary Ball Spline Slide Bush Stroke Bush Slide Rotary Bush Slide Way Slide Table Miniature Slide Table 1-37 Grease and Anti-rust oil grease application grease pre-applied grease pre-applied grease pre-applied anti-rust oil only anti-rust oil only anti-rust oil only grease pre-applied grease pre-applied grease pre-applied