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TECHNICAL INFORMATION

Castor Wheel Guide


Choosing the right Wheel


To select the wheel, the load and the surface of floor are the major factors to be considered. The larger the wheel dia, the greater the load that can be carried. Rough surfaces or high impact loads halve the loads carrying capacity. Bearings permit higher wheel loads, lower friction losses. While selecting the material of wheel the other major factor is the flooring of the factory, in case of soft floor like asphalt or epoxy, the surface deformation causes the hard tread wheels to set in small ruts & cause not only extra effort to over come the resistance but may also cause damage to flooring, on the other hand when a soft tread wheel is used, the wheel flattens under load and the wheel moves more easily our obstruction as they deform and roll over the obstruction instead of climbing. Therefore a judicious decision is required to be taken  considering the above factors for selection of diameter & tread hardness. We will be pleased to suggest the right wheel but an accurate assessment can be made by the end user making his own tests considering floor conditions, hardness, wheel dia, tread profile etc.

The load carrying capacity of SUTRAN wheels is given based on normal working conditions on reasonably level floor free from pot holes, breaks, non leveled entrances, floor litter or other obstacles.

The load capacity for a four wheel trolley can be calculated as per:

Weight of Trolley (Transport equipment) + load
                        4 ( No. of Wheels)



In case of uneven floor the divider should be 3, as only three wheels are in contact with the floor. Further adequate safety margin or allowance has to taken for uneven distribution of load, rough uneven surface which causes high impact load, as well for mechanical towing.

Castors

Fixed Castors


These have the top plate rigidly fastened to the fork legs. The wheels move forward or backward.

Swivel Castors


The fork & wheel rotate 360 degrees when the top plate is fixed.

Off set


Horizontal difference between center line of Swivel & Wheel. The offset causes the castor to swivel in line and the wheel trail in the opposite direction in which the equipment is being moved.

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CHOOSING THE RIGHT CASTOR

  DIRECTION OF TRAVEL MANOEUVRABILITY STABILITY STEERING COMMENTS
DIRECTION OF TRAVEL - 2 Swivel 2 Rigid Good except in confined spaces Very stable, most practical combination for industrial use Accurate, even on long straight runs, to be pushed with rigid castor loading. For more open spaces or long runs
DIRECTION OF TRAVEL - 4 Swivel Exceptional, suitable for winding runs where side ways action is required Good except on narrow trolley Erratic and hard to guide especially over bumpy terrain and when heavily loaded Equipping two castors with direction locks makes the trolley very versatile & suitable for long straight runs
DIRECTION OF TRAVEL - 2 Swivel 2 Rigid Excellent and ideal for confined spaces Fair Excellent if ¾ packing provided on fixed castor The entire load rests on the 2 central fixed castor wheels and the swivel castors are subjected to extreme shock loads
DIRECTION OF TRAVEL - 4 Swivel 2 Rigid Excellent, can be turned in own length, but not moved at right angles Most stable, ideal for long trolleys destroyed to carry heavy loads Best for long wheel bases and straight lines Packing of 1” on fixed castors can be provided to improve the maneuverability, but at the cost of reduced load carrying capacity per wheel as only four wheels remain in contact with the floor & SW castors being subjected to high shock load

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