332 TECHNICAL INFORMATION RLubrication (grease inspection and replenishment) The grease forms an oil film on the ball screw's screw shaft, rolling surface inside the nut, and surface of the balls and acts to reduce friction and prevent heat damage. MISUMI ball screws are filled with grease before shipping, however after commencing use, it is necessary to perform regular and appropriate inspection and grease replenishment. When adding grease, use the same grease that was used at shipment and do not mix with other greases. t (VJEFT GPS JOTQFDUJPO BOE HSFBTF SFQMFOJTINFOU After 2~ 3 months of operation, if the grease is very dirty, we recommend to remove the old grease and fill with new grease. Subsequent inspection intervals are recommended to be every 6 months, however, we recommend this timing be adjusted to an interval appropriate for the usage environment. RDesign of Ball Screws and Peripherals, Caution when Assembling Ball screws are parts that receive only axial load, when a radial load or moment load is received, it could cause sliding failure, vibration/abnormal noise and reduction in lifespan. To prevent parallelism error and misalignment of peripherals that causes radial load and moment load on ball screws, it is important to appropriately design and assemble peripherals. t Misalignment of Ball Screw and Support Unit (Figure 1) - Misalignment occurs when the shaft center of the ball screw fixed to the fixed-side support unit is misaligned with the center of the shaft bearing of the support unit on the support side. - Misalignment allowance value (reference) t 20μ or Less t When there is high precision usage criteria or when using preloaded ball screws, keep the value as low as possible. t Parallelism of ball screw and linear guide (Figure 2) - Parallelism error is where the ball screw is tilting toward up/down or left/right with respect to the linear guide or other references. - Tilting allowable value (reference) (Figure 3) t 1/2000 or Less t When there is high precision usage criteria or when using preloaded ball screws, keep the value as low as possible. t Caution During Design Design/machining precision of ball screw peripherals can be factors that cause misalignment and tilting. Particularly be cautious of the following two points. t Flatness of base plate t Dimensional precision from edge of support unit to shaft center t Precautions on Installation t Mounting/assembly of ball screw peripherals can cause misalignments and tilting. Particularly be cautious of the following four points. - Error in left/right direction of support unit (Figure 1) - Parallelism error of linear guide and ball screw (Figure 2) - Fixing of table and nut bracket - Fixing of ball screw nut and nut bracket t If abnormal noise/sliding is being caused by the ball screw movement after assembly, loosen each of the fastened parts again and reassemble while ensuring smooth sliding. 2Available Grease Ball screw products are shipped with grease filled. If not otherwise indicated, lithium soap based grease (Alvania Grease S2 made by Showa Shell Sekiyu K.K) is the standard type that is used. (BSX0601, BSX0801, and BSX0802 are filled with Multemp Grease PS2 made by Kyodo Yushi Co., Ltd.) Grease type can be changed from the standard to the following types. &Usage temperature is for grease performance and not the usable temperature of the ball screw. 9Avoid using Ball Screws at a temperature of more than 0~80°C. Part Number Product Name Main Features L Type ET-100K (Made by Kyodo Yushi) Excels in heat resistance, oxidation stability, adhesion and adhesive power. In addition, splash or leakage is little. G Type LG2 (Made by NSK Ltd.) Special grease for linear guides, ball screws and etc. for clean-room use. Item Condition Unit Measurement Method Standard L Type G Type Grease Performance Thickener - - - Lithium Type Aromatic Diurea Lithium Type Base Oil - - - Mineral Oil Ether Synthetic Oil Mineral Oil + Synthetic Hydrocarbon Oil Base Oil Viscosity 40°C mm2/s JIS K2220 5.19 131 103 30 100°C 12.2 12.8 - Worked Penetration - - JIS K2220 5.3 283 280 207 Dropping Point - °C JIS K2220 5.4 181 <260 200 Evaporation Amount 99°Cx22h wt% - - 0.15% 1.40% Oil Separation Rate 100°Cx24h wt% JIS K2220 514 2.8% 1.2% 0.8% Operating Temp. In Air °C - -25~+135 -40~200 -10~80 Part Number - L BSS2010L - 700 (L Type Greased) BSS2010G - 700 (G Type Greased) & Please add L or G after the part number of standard type when placing an order. 2Available Ball Screws and Grease Types Type Accuracy Grade Type Unit Price (Add to the price of Standard Type) L≤1000 L>1000 Precision Ball Screws C 5 BSS L Type G Type L Type G Type C 7 BSSE Rolled Ball Screws C 7 BSST C10 BSSR BSSZ BSSRK BSSZK 9 Not applicable to Precision Ball Screw BSX, C-BSS, Rolled Ball Screw BSSC and C-BSSC. Fixed Side Support Side Figure 1 Misalignment of Ball Screw and Support Unit Misalignment Figure 2 Parallelism Error of Linear Guide and Ball Screw Figure 3 Tilt of Ball Screw and Nut Bracket Tilt Ball Screws Lubrication, Grease Measures, Cautions on Designing and Assembling Peripherals
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