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the bearing without risking damage to the shaft (if done correctly and within tolerances).
■
Always heat to the temperature specified by the bearing manufacturer and consult the
technical specifications. It is important to define what the temperature differential shall
be for mounting a specific bearing safely. This will usually depend on the diameter of the
bearing.
■
Use a pyrometer (such as the Model HH11 provided by BESSEY
®
, which includes a good
surface probe) to measure bearing temperature accurately.
■
Use the largest bar that will pass through the inner diameter (I.D.) of the bearing and
ensure that crossbar/yoke is fitted over upright posts. Center bearing between the
posts. Do not allow bearing to touch upright posts when heating.
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Models SC110V, BC & BCS also have optional raising blocks for larger sized bearings.
Adding a level of raising blocks will increase time to heat by approximately 20%.
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For models SC110V, BC & BCS, plug the bearing heater in, turn the On/Off switch to
“On.” NOTE SC110D has specific and separate instructions. See page 5.
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When the pyrometer shows the desired and proper temperature, turn the bearing
heater On/Off switch to “Off”, remove the now-heated bearing and install in a timely
manner. Use gloves – it’s now “hot”.
■
Bearing Heaters may also be used to heat metal sleeves, gears, sprockets, etc.
■
Bearing Heaters should not be used on metal floors, platforms or benches or near
machines, steel columns, reinforcing bars or other metal objects, the heating process
will be slower.
Make sure heater is turned off when not in use. Do not operate crossbar/yoke without crossbar/
yoke in place. Bearing Heaters also demagnetize bearings: simply remove bar, turn heater on
and pass bearing several times between the two upright columns without contacting them.
Bearing heaters SC, BC and BCS have a 20 minute duty cycle and should be turned off
after and allowed to cool before being re-started.
CAUTION!
■
Bearings generally should only be heated up to a maximum temperature of 120°C
(248°F).
■
Precision bearings should only be heated up to a maximum temperature of 70°C (158°F).
■
Normally a temperature differential of 150° F between the shaft and the bearing
provides sufficient expansion to effectively mount a bearing. Bearings should not be
overheated as it will affect the metallurgical properties and dimensional stability of the
bearing unit and may change the absolute size permanently. Standard ball bearings
fitted with seals or shields should not be heated in excess of 210° F because of the
grease and oil sealants.
■
Do not use induction heaters for bearings or workpieces, which are outside the
minimum, or maximum dimensions as specified in the sales data sheet.
