CONSTRUCTION
RGP ball transfer units are composed of a large precision ball rolling
on a bed of small precision balls seated in a hardened hemispheric cup. All
the balls are ground and heat treated in order to develop the highest load
carrying capacity and lowest torque. The construction allows the large ball
to rotate freely and immediately in any direction. Friction is extremely reduced
and a smooth movement is provided at speed 2m/sec. Very heavy loads can be
easily moved with low effort. Machined Heavy Duty units are studied for heavy
shock loads and long life applications. Pressed Light Duty units are suitable
for light loads. The manufacturing range includes ball transfer units with
main supporting balls from 8mm (5/16") up to 90mm (3 1/2" Diameter)
in steel, stainless steel or polyacetal material and loading capacities up
to 2.000 KGS (4.500 pounds). The housings of the units are bright metal zinc
plated or completely in stainless steel and they are incorporating self cleaning
bottom holes and oiled felt sealing system (except SP 8/12/15). This is available
on request on SP 15 & 25 series only.
APPLICATIONS
RGP ball transfer units are widely used in all industries to allow
freely conveying in any direction of heavy loads with low stress. Most popular
applications include aircraft transport cargo rolling decks, sheetmetalworking
machines, folding presses, balltransfer tables, lifting equipment & platforms,
conveyors, marble working machines, ceramic tiles and bricks machines, transporters
for containers & pallets, sliding walls, doors & windows, robotics,
electronics.
HOW TO DETERMINE THE TYPE. NUMBER & DISTANCE
TYPE & NUMBER = Ball size loading capacity & the loading placed
on each ball transfer unit is normally provided by the weight of charge divided
by 3. The result gives the highest load which any individual ball transfer
unit may have to support. A suitable security charge margin is suggested It
is important that the load must be supported through the centre line of the
unit. Downwards & sideways applications will affect relative loading capacities.
DISTANCE = In order to determine the distance between the ball transfer units
divide the shortest horizontal distance by 2,50. For example, for a weight
measuring across the base 500mm x 1.000mm the recommended distance will be
200mm (500mm: 2,50). TEMPERATURE RESISTANCE= Generally 30°C + 100°C (212 F),
+70° continues and + 100°C intermittent, do not affect the running and quality.
Without sealing, temperatures up to + 150°/200°C are possible. Higher or lower
temperatures will affect loading capacities. FRICTION = At speed of 1m/sec
, friction will be around 0,005y. However this is subjected to considerable
deviations according to the specifical applications of the ball transfer units.
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