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| Small bearings usually have thin raceway cross-sections
and radial play in the range of 0.0002 to 0.0008 inches. This means
that considerable care needs to be taken when bearings need to be
permanently mounted on shafts and/or housings. If bearings are press-fit
to their mating components, tolerances of these components will need
to be held tightly to avoid loss of radial play and bearing malfunction.
As an alternative, bearings are often bonded in place with adhesive.
This method also allows bearing pairs to be preloaded with a weight
to remove axial play while the adhesive is curing. With proper design
and handling, a bearing assembly using adhesive bonds can be extremely
strong. This section deals with some of the issues involved in adhesive
bonding. |
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ADHESIVE
TYPES |
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ADHESIVE
GROOVES |
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For maximum strength, there should be a gap between mating components of 0.002 to 0.005 inches. In order to reduce overall runout, it is usual to design an adhesive groove in the mating surfaces that gives sufficient clearance for bond strength and also provides a trap for excess adhesive. The other areas of the mating surfaces should be kept at a minimum clearance to improve runout characteristics.
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