Cross Roller and Ball Rail Load Calculations
The load ratings are based on each roller/ball bearing element. When calculating actual rating, the number of rolling elements must be determined.
Roller/Ball Bearing Capacity The max usable load per rolling element.
Basic Dynamic Load Used when calculating life for each rolling element. Based on 50Km of travel.
Basic Static Load Rating Maximum impact load prior to causing permanent deformation for each rolling element.
STROKE AND ROLLER ⁄ BALL QUANTITY CALCULATIONS
When selecting Cross Roller or Ball Rails, several considerations must be made:
- Stoke Length
- Quantity of rolling elements (Roller or Ball)
- Load capacity
Calculation of retainer length and roller quantity
The number of rolling elements is dependent on the retainer length. To calculate the number of rolling elements you must first calculate the retainer length. Retainer Length is the length of engagement between both side of the rail when fully extended.
Calculating the number of rolling elements
CROSS ROLLER / BALL RAIL ASSEMBLY LOAD CALCULATIONSCalculating Cross Roller / Ball Rail assembly load rating
Selecting the correct travel length
When selecting the appropriate rail assembly, the expected travel should be 80% of catalog Max Travel.
Basic dynamic load rating is based on 50km of travel. Use the formulas below to calculate equivalent life in given applications.
When using cross roller side by side, which specification should be chosen?
Loading.............P = 4000N
Stroke length.....SW = 120mm
LOAD CAPACITY & LOADING DIRECTION SAFETY FACTOR