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      • LOAD, LENGTH AND PITCH
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Type, Length and Pitch.

RollerType

The Following points are very important in the selection of a Roller Type:
  • dimensions and weight of the product to be transported;
  • the kind of packaging around the product to be transported (box, case, crate, pallet, loose etc);
  • contact surface of the packaging or the product to be transported (hard, soft, straight, round, etc);
  • environmental conditions (moisture, dust, temperature, etc);
  • special requirements (antistatic, low noise, etc);
  • transport conveyor type (gravity conveyor, powered conveyor, belt conveyor, etc).
Selection of Roller Length

Roller Lengths greater than 1.25 to 1.3 times the width of the product are not generally used.  This is to prevent an unacceptable point load.  The load capacity at the point is 60% of the values given in the diagram above.
Selection of Pitch

To transport a product without any problems, there should be at least three load rollers under the load-bearing surface of the product: the maximum pitch is the product length divided by three.  If the load in the box, case or crate is unevenly distributed, a smaller pitch must be chosen.  The same is true if the height of the product is more than twice its length.

If the contact surfaces are soft and slack and the pitch is too large, then the product will tend to droop down either side of the roller tube, which will increase the drag forces.  This can largely be prevented by reducing the pitch.
Picture
Picture
Picture
L = Length of the Product Transported
H = Height of the Product Transported
S = Pitch or operation between the rollers
Load Capacity

The maximum load capacity of a Roller is determined by:
  • bearing cases (side A + B);
  • the tube and spindle diameter;
  • the spindle type;
  • the partial length under the load;
  • the load pattern (evenly distributed or point load).

The weight of the product to be transported must not be greater than the total load capacity of the load-bearing rollers.  If the product or its packaging have hard, stiff and irregular contact surfaces, a situation may occur in which the rollers directly beneath the product are not taking the whole weight.  This can mean that only two or three rollers may be carrying the total weight of the product.  In practice this may lead to more rollers having to be placed than theoretically calculated, or that stronger rollers have to be used.
STANDARDS &
​TOLERANCES
MATERIAL
​SPECIFICATIONS
COVERINGS
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  • Home
  • About
  • ROLLERS
    • CHOOSING A ROLLER >
      • LOAD, LENGTH AND PITCH
      • STANDARDS AND TOLERANCES
      • MATERIAL SPECIFICATIONS >
        • TUBES
        • SPINDLES
        • Order Examples
      • COVERINGS >
        • PVC
        • RUBBER
      • GROOVED BEARINGS
    • PRODUCTS >
      • BALL BEARING ROLLERS
      • GRAVITY AND SLIDE BEARING ROLLERS
      • POWERED ROLLERS
      • TROUGHED IDLERS AND DRUMS >
        • Troughed Idlers
        • Drum Rollers
      • CONICAL ROLLERS
      • 24v MOTOR ROLLERS >
        • Driven Rollers
        • Control Cards
        • 24v MOTOR EXPLAINED
      • Accessories
  • Contact
    • NDW NL
    • ALSO Group BE
  • NEWS