NSK Ball Screw, Standard Inventory
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1 Maintenance-free Series NSK Ball Screw, Standard Inventory W Series Environment-friendly maintenance-free ball screws. Low-cost and standard inventory for quick delivery. Compatible with stringent environmental concerns. Standard Inventory vailable
2 NSK K1 W Series Overview, NSK K1 Equipped Maintenancefree Series Ball Screw The W series ball screw is a new member of the highly regarded NSK maintenance-free series ball screw product line, incorporating the NSK K1 lubrication unit. 1. eatures Ball screw with NSK K1, a new compact and efficient lubricating unit, exhibits excellent performance. 1. Long-term, maintenance-free usage In mechanical environments where lubrication is difficult to apply, long-term running efficiency is maintained by using the NSK K1 in combination with grease. 2. Short lead time Maintained in standard inventory to ensure fast delivery. 3. Low Cost Costs the same as the series, a conventional standard inventory item. The low-cost series provides improved cost performance through long-term maintenance-free operation. 4. Prevention of oil-related environmental pollution In locations where oil adversely affects the environment, or in mechanisms with severe hygienic restrictions, sufficient lubrication is provided using the NSK K1 in combination with minimal grease.. Effective in environments where the lubricant is washed away In facilities where mechanisms are washed down with water, or subject to severe weather conditions, long service life is ensured by using the NSK K1 in combination with grease. 6. Maintains efficiency in dusty environments In environments where oil and grease-absorbing dust is produced, long-term lubrication efficiency is maintained by using the NSK K1 in combination with grease Performance Comparative endurance test of ball screw with/without NSK K1 Test material and conditions Ball screw 2 mm shaft diameter, 2 mm lead Lubrication Comparison of unit with/without NSK K1 Speed 4, rpm (8 m/min) Stroke 6 mm Test results Without lubrication, operation is no longer possible at 8. km, while with lubrication by NSK K1, operation is possible beyond 21, km. Lubrication NSK K1 Without lubrication , 1, 1, Running distance (km) igure 1 Results of endurance test without lubrication NSK also conducts various tests under other conditions. Please contact NSK for details.
3 Maintenance-free Series NSK Ball Screw, Standard Inventory W Series 3. Specifications In the standard specification, K1 is equipped between the ball screw nut and the labyrinth seal; therefore, the overall nut length is slightly longer conventional length. In the standard specification, lubrication is achieved with a combination of NSK standard grease, which fills the nut, and Lubricating Unit NSK K1. ccuracy, clearance, and preload are the same specifications as with conventional units; torque is slightly increased due to the equipped NSK K1. ccuracy and preload specification ccuracy grade Preload symbol JIS C Z (Clearance ) * Dynamic frictional torque increases slightly due to the equipped NSK K1. (Please refer to the ball screw specification notes, p. 4-1.) 4. Sample: W 1 4 C Z 23 K1 Series code Screw shaft diameter (mm) Lead (mm) ccuracy grade code NSK K1 equipped code Screw shaft length (mm) xial play code * s to nut type code and reference number, K1 is added to the end of a conventional code and number.. Examples of applications NSK K1 Equipped Ball Screws are maintenance-free over a longer period of time and support a wide variety of applications. Semiconductor and LCD fabricationrelated equipment Robot-related equipment Woodworking machines Machine tools utomobile-related manufacturing facilities Handling instructions To maintain the high efficiency of NSK K1 over a long period of time, please follow these instructions. 1. Permissible temperature range Max. operating temperature: C Max. peak temperature: 8 C 2. Use of chemicals Never leave the ball screw in close proximity to grease-removing organic solvents such as hexane, thinners, etc. Never immerse the ball screw in kerosene or rust preventative oils which contain kerosene. Note: The following oils are compatible for use with NSK K1: water-based cutting oil, oil-based cutting oil, grease (mineral oil-v2, ester-ps2). 2
4 Maintenance-free Series NSK Ball Screw, Standard Inventory W Series 6. s for stroke and shaft diameter lead combination Shaft dia. lead (page) Nominal Stroke stroke limit (4) () (6) (7) (8) (9) (1) 83 W1CZ-23K WCZ-23K1 98. WCZ-23K WCZ-33K1 2 W2CZ-371K W1CZ-371K W1CZ-38K1 244 WCZ-38K WCZ-43K W21CZ-99K W1CZ-8K1 444 WCZ-8K1 6 W2CZ-771K W1CZ-771K1 626 W22CZ-82K W21CZ-899K1 W2CZ-1171K W1CZ-1171K1 6 W22CZ-2K1 11 W21CZ-1399K1 26 W22CZ-162K1 s for recommended support unit (fixed side) WBK1-1 WBK1-1 WBK-1 WBK-11 WBK-1 WBK-11 K1 Kit NSK provides the K1 Kit a lubrication unit which can be equipped onto the standard inventory NSK ball screw. Only series specification numbers containing, as shown below, are applicable. Sample: W27 3P CZ2 The K1 Kit must be equipped by NSK. Please consult NSK for details. 3
5 7. Dimensions Screw shaft 1, lead E M6 1. tap drill thru g h6 C.2 1 M C C. C. 42 PCD 36 C. R () R.2 E E M1 1. (1) 3 28 Cross-section Shaft diameter Lead/Direction of turn 1 4/Right Ball diameter 2. Effective turns of balls 2. 1 ccuracy grade/xial play code C/Z Basic dynamic load rating N (kgf) 173 (17) Basic static load rating N (kgf) 223 (22) Stroke Screw shaft length Lead accuracy Shaft runout WCZ-23K WCZ-33K WCZ-43K xial play Dynamic friction torque N cm.2 3.3* (kgf cm) (.2.34) actory-packed grease NSK grease PS2 adds approximately. N cm torque. 4
6 C.. C R E.7.2 3g M () C.2 R.2 E E 1 M h6 C. (1) 3 4 Stroke Screw shaft length Lead accuracy Shaft runout WCZ-23K WCZ-38K WCZ-8K C. 4 Screw shaft, lead M6 1. tap Cross-section drill thru PCD 4 Shaft diameter Lead/Direction of turn /Right Ball diameter (3/32) Effective turns of balls 2. 1 ccuracy grade/xial play code C/Z Basic dynamic load rating N (kgf) 237 (24) Basic static load rating N (kgf) 316 (32) xial play Dynamic friction torque N cm.4 4.9* (kgf cm) (.4.) actory-packed grease NSK grease PS2 adds approximately.6 N cm torque. Maintenance-free Series NSK Ball Screw, Standard Inventory W Series
7 Screw shaft, lead E.2 M6 1. tap drill thru.7.2 3g h6 C.2 M 28. C C. C. 4 PCD 4 C R.2 () R.2 E E M1 1. (1) 3 32 Cross-section Shaft diameter Lead/Direction of turn 1/Right Ball diameter (3/32) Effective turns of balls 2. 1 ccuracy grade/xial play code C/Z Basic dynamic load rating N (kgf) 236 (24) Basic static load rating N (kgf) 324 (33) xial play Stroke Screw shaft length Lead accuracy Shaft runout W1CZ-23K W1CZ-38K W1CZ-8K Dynamic friction torque N cm.4 4.9* (kgf cm) (.4.) actory-packed grease NSK grease LR3 adds approximately.6 N cm torque. 6
8 C. M.8 Tap depth C. R g M () C R.2 E. E.18 1 M h6 C. (1) 3 4 Stroke Screw shaft length Lead accuracy Shaft runout W1CZ-371K W1CZ-771K W1CZ-1171K M6 1. tap.11 E C. Screw shaft, lead Cross-section drill thru PCD 4 Shaft diameter Lead/Direction of turn 1/Right Ball diameter 3.17 (1/8) Effective turns of balls 2. 1 ccuracy grade/xial play code C/Z Basic dynamic load rating N (kgf) 44 (4) Basic static load rating N (kgf) 638 (6) xial play Dynamic friction torque N cm.9.4* (kgf cm) (.9.) actory-packed grease NSK grease LR3 adds approximately.7 N cm torque. Maintenance-free Series NSK Ball Screw, Standard Inventory W Series
9 Screw shaft, lead g h6.11E M6 1. tap drill thru C C. C.2 C. C. PCD M R () R.2 E 1 M.8 Tap depth E M 1. 8 (1) Cross-section - Shaft diameter Lead/Direction of turn 2/Right End cap Ball diameter 3.17 (1/8) Effective turns of balls ccuracy grade/xial play code C/Z Basic dynamic load rating N (kgf) 387 (39) Basic static load rating N (kgf) 28 (9) Stroke Screw shaft length Lead accuracy Shaft runout W2CZ-371K W2CZ-771K W2CZ-1171K xial play Dynamic friction torque N cm * (kgf cm) (.16.7) actory-packed grease NSK grease LR3 adds approximately.7 N cm torque. 8
10 9.4. M6 1. Tap depth C C.3 2. R g M 4 74 C () C.3.4. R.2 E. E.18 M C. h6 1 () Stroke Screw shaft length Lead accuracy Shaft runout W21CZ-99K W21CZ-899K W21CZ-1399K E C. 66 Screw shaft 2, lead 1 M6 1. tap Cross-section drill thru PCD 9 Shaft diameter Lead/Direction of turn 2 1/Right Ball diameter (/32) Effective turns of balls 2. 1 ccuracy grade/xial play code C/Z Basic dynamic load rating N (kgf) 688 (7) Basic static load rating N (kgf) 18 (11) xial play Dynamic friction torque N cm * (kgf cm) (.2.8) actory-packed grease NSK grease LR3 adds approximately 1. N cm torque. Maintenance-free Series NSK Ball Screw, Standard Inventory W Series
11 Screw shaft 2, lead E M6 1. tap drill thru C C g6 C. C.3 PCD C. h6 C..4. M R.2 () R.2 E M6 1. Tap depth E M 1. 1 () Cross-section (Unit:mm) Shaft diameter Lead/Direction of turn 2 2/Right Ball diameter (/32) Effective turns of balls 1. 1 ccuracy grade/xial play code C/Z Basic dynamic load rating N (kgf) 37 () Basic static load rating N (kgf) 84 (86) Stroke Screw shaft length Lead accuracy Shaft runout xial play Dynamic friction torque N cm * (kgf cm) (.24 1.) W22CZ-82K W22CZ-2K W22CZ-162K actory-packed grease NSK grease LR3 adds approximately 1. N cm torque. 1
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