Linear guide systems - Nadella - #39

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XPR_Objektbroschuere_020209.indd table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:5.00pt "Trebuchet MS", sans-serif; } .font1 { font:7.00pt "Trebuchet MS", sans-serif; } .font2 { font:8.00pt "Trebuchet MS", sans-serif; } .font3 { font:10.00pt "Trebuchet MS", sans-serif; } .font4 { font:12.00pt "Trebuchet MS", sans-serif; } .font5 { font:19.00pt "Trebuchet MS", sans-serif; } .font6 { font:23.00pt "Trebuchet MS", sans-serif; } Rolbloc Rolbloc system The carriages based on Rolbloc's system are recommended for applications with heavy loads, high frequency of work and aggressive environment (dust, abrasive). For the profiled guide rollers, the contact beween the rollers and the rail takes place on the ground raceways, which are inclined respect the rotation axis of the guide roller. Due to this inclination angle in the contact area there is a dragging proportional to the dimension of the contact area and to the value of the inclination angle. In the ROLBLOC system the rotation axes of the roller guides are parallel to the raceways of the rail, with the following pure rolling. The pure rolling recudes the superficial stress and the effects of the dust between the surfaces. MBL(R^ 335-1 "0/Fixing side I Main load MBL(R) 335-2 MBL components are checked with the same method used for ROLBLOC BL, but it is very important to consider the exact bearing ratings that must be correct for the load direction. When the axial load (perpendicular to the fixing side of the carriage, or parallel to the fixing side of the rail) is in the direction of the two coupled guide rollers, as for the sketch above, you must use the coefficient with the suffix 2 (Fa2, Y2), otherwise with the suffix 1 (Fai, Yi). Technical features ROLBLOC carriages BL2.. and BL4.. are composed by a body in burnished steel on which are mounted two or four roller guides equipped wi th tapered rollers (similar to flat roller guides type PK..C). The final part of the code (that can be 52, 75 or 115) shows the external diameter of the roller guides. MBL carriages are composed by an alluminium body provided, on one side, with four threaded screws that allow the direct mounting on the fixing plate. Besides, in order to facilitate the aligning, there are also two pin screws. The body is equipped with guide rollers with a double row angular contact ball bearing. On the body are mounted three guide rollers according to the following combinations: • MBL 335-1: three concentric guide rollers, of which one on the fixing side; • MBL 335-2: three concentric guide rollers, of which two on the fixing side; • MBLR 335-1: three concentric guide rollers, of which one on the fixing side; • MBLR 335-2: three concentric guide rollers, of which two on the fixing side. Mounting instructions For the mounting of the carriages BL or MBL, with two, three and four guide rollers, are necessary at least two carriages on every rail. A slider realised with only two carriages for rail is not steady (see sketch below). Ix 1 ^ lqife*l ^ ^ YES NO Pay the maximum attention during the setting of the eccentricity of the eccentric guide rollers in order to avoid excessive preloads that can reduce the lifetime of the system. Setting the eccentric guide rollers by rotating the stud anticlockwise (respect the head side of the guide roller). MBL 335-.. carriages are dissymmetrical components. In order to fully utilize the load capacity of the carriages it is necessary to consider the main load direction and than put the two coupled guide rollers in that direction. 38