GRW20-S Standard

♦   Preload selection and applications

– Light (L)

* Machine Requirements：Equipments with small vibration and small thrust, load in one fixed direction. High accuracy is not required. Reduction of frictional force.

* Application Examples：Laser welder, small CNCmill machine, cutter, welder, automatic tool changer, packing machine, material supply equipment.

– Medium (M)

* Machine Requirements：Equipments with load on a post. Equipments with a torque acting on it. Equipments working in one direction. Equipments with low load. Equipments with high accuracy.

* Application Examples：Automated feeder, linear feeder, automatedpainting machine, precision slide table, Z-axis control on machines, PC board punch machine. Industrial robot, EDM machine, NC lathe.

– Heavy (H)

* Machine Requirements：High rigidity, high vibration, high thrust equipments. High load, high torque equipments.

* Application Examples：Machining center spindle, NC lathe, Z-axis spindle of the machinery, milling machine, grinding wheel feeding of grinding machine.

♦  Pre-Loaded Description

– Purpose：1. Increase the rotational accuracy of axle

2. Increase the rigidity of axle

3. Reduce unwanted clearance

4. Reduce vibration and noise while bearing stops.

– What is bearing preload?：The preload describes the process wherein a permenant thrust road is applied to the bearing, so that the bearing is secure in the groove and has no axial clearence. Apply normal force (N). Measure value of L of a pair of bearings. L=L1+L2. Press these pair of bearings on the covers to apply preload and bring these bearings together

♦   Selection Notes

– [ Model ]：Pick up the model according to assembly method.

Assembly：

1. Plane mounting：GAK、GBK、GEK、GAF、GBF、GEF、GSW、GSWE、GUN、GTN。

2. Suspension and spindle mount：GFK、GFF、GRW、GRWE、GUR、GTR。

– [ Size ]：Decide the size according to the ballscrew shaft O.D., and the center height.

– [ Grade ]：Standard and economic types for options.

– [ Pre-loaded ]：Decide pre-loaded of the bearing per needs.

– [ Surface Finish ]：

Black dyed – Regular environment use, low humidity.

Nickel plating – Clean room use.

– [ Bearing category ]：Available Japanese series and Taiwanese series.