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Ball Screw Support Bearings - 6 Pages

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Catalogue excerpts

Ball Screw Support Bearings Assembly Manual

 Open the catalogue to page 1

Assembly Procedures 1 Preparations prior to Assembly First choose a clean location. And all of the necessary tools and equipment should be on hand before beginning any bearing mounting procedure. 2 Checking the Shaft and Housing The shaft and housing should not have dirt or chips. Then measure and record the values to confirm correct size, roundness, taper, and surface roughness, as well as shoulder squareness and corner radii for the shaft and housing to ensure they are within the designed specifications. Recommended shaft fit and housing fit are shown in Tables 1.1 and 1.2. Shaft 1 3 Grease...

 Open the catalogue to page 2

A continuation of Procedure 4 (Mounting a Bearing). Bolt the press-fit cover to the housing. The bolts are tightened in a diagonal and several times. The Example of Methods for Adjustment of the Outer Ring Clearance Reduction Gap (Δ) 1. Measure the depth (a) of a housing. 2. After piling the bearings in the same direction on a press-fit cover, measure the height (b) from the end face of a press-fit cover. Because exact height cannot be measured if an oil film is between bearings when piling the bearings, push bearings strongly. When measuring the height, always pile the bearings in the same direction,...

 Open the catalogue to page 3

Table 1.1 Shafts and Recommended Fit Unit: ym Thread nominal diameter (mm) Lead angle Thread surface friction angle Mean diameter of nut bearing surfce (mm) Coefficient of friction of nut bearing surface (»0.15) Coefficient of friction of thread surface («0.15)

 Open the catalogue to page 4

Ball Screw Support Bearing TAB Series Boundary dimensions (mm) Bearing no. Rotation speed limit (3) (rpm) Axial limiting load (2) (kN) Grease lubrication Note (1) Minimum r for inner ring bore is 0.6. (2) When the axial load is on a 2-row or 3-row arrangement, the values in the table should be multiplied by 2 and 3 respectively. (3) Rotation speed limit for medium preload (preload code GM). Bearing Number Designation Non-mark Open Type NACHI LR : Contact Seal, NK : Non-Contact Seal NSK DDG : Contact Seal FAG RS : Contact Seal Accuracy Bearing Bore Diameter Bearing Type Code Single Universal (Combination...

 Open the catalogue to page 5

Tokyo Head Office URL:http://www.nachi-fujikoshi.co.jp E-mail:webmaster@nachi-fujikoshi.co.jp : Shiodome Sumitomo Bldg. 17F 1-9-2 Higashi-shinbashi, Minato-ku, Tokyo 105-0021, JAPAN Tel: +81-(0)3-5568-5111 Fax: +81-(0)3-5568-5206 Toyama Head Office : 1-1-1 Fujikoshi-Honmachi, Toyama 930-8511, JAPAN Overseas Companies ASIA and OCEANIA Sales NACHI SINGAPORE PTE. LTD. No.2 Joo Koon Way, Jurong Town, Singapore 628943, SINGAPORE Tel: +65-65587393 Fax: +65-65587371 VIETNAM REPRESENTATIVE OFFICE, HO CHI MINH 4Fl., Yoco Bld., 41 Nguyen Thi Minh Khai St., Dist.1, Ho Chi Minh, VIETNAM Tel: +84-8-3822-3919...

 Open the catalogue to page 6

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