Blog

Bearings are probably the more complex designed component of any rotating equipment; yet, they are the most misunderstood by the maintenance practitioners who handle them on a daily basis.” —Holcombe Baird, Reliability Center, Inc.

If experiencing premature bearing failures, you should not only look at bearing lubrication practices but also at bearing installation practices. When using an induction heater it is important to make sure that the heating is steady and even; fast is not always good, especially if you do not know what is happening with the temperature of the OD of your bearing. Remember that the inner race heats faster than the outer race. Precision bearings are prime candidates.

In the picture above, on the left you see a single temperature probe, placed on the ID of the bearing, and by the time the temperature of the ID reaches 110° C, the temperature of the OD is only 60° C. This could be a huge problem if the clearance between the ball or roller bearings and the raceways of the ID and OD is not enough to handle the temperature difference. In these cases the bearing balls or rollers get squeezed between the OD and ID damaging the bearing before it is even installed.

Read my entire article at Reliable Plant

Many thanks to Rick Trichka with TM Induction Heating and to Robert “Bob” Latino and Holcome Baird at Reliability Center, Inc. for their input.

by Ana Maria Delgado, CRL

  1. Make sure the surfaces of the vertical posts are clean.
  2. Improve the contact between the vertical post and the crossbar by applying a light coat of Vaseline or grease to the contact surface of the vertical post.
  3. The temperature probe should always be placed on or as close as possible to the inner race or ID of the workpiece being heated.
  4. When possible make sure a second probe is placed on the outer race or OD of the workpiece being heated to also track the temperature of the OD, in line with the ID probe.
  5. For the most efficient heating, always use the largest possible crossbar that will fit through the ID of the workpiece being heated. Stacking of multiple crossbars is permissible.
  6. It is not a requirement that the workpiece must touch the crossbar(s). Just so long as the bar goes through the bore (ID) someplace.
  7. Most important of all is that the workpiece being heated always be automatically demagnetized. Any induction heater that does not do this automatically COSTS you money instead of saving it.

by Bernd Seidenthal CRL


LUDECA is proud to announce that effective October 20,  2017, LUDECA is certified as an authorized TM Induction Heating Service and Repair Center for the United States.
Our factory trained technicians are highly experienced, and committed to providing our customers with excellent service.
We look forward to servicing your TM Induction Heating products at our Doral, Florida location.
For more information, visit our website.

by Ana Maria Delgado, CRL

It seems that every maintenance department has a hard time installing bearings because of the problems inherent in conventional heating methods.

Applying care, good technique and heating methods is better. Over 90% of rotating equipment has defects at startup that can result in equipment failure.

One reason bearing installation is often a herculean task is not using proper heating methods. Excessive heat applied to the bearing during installation can introduce defects that lead to premature equipment failure.  Instead, heating a bearing up on an induction heater, automatically demagnetizing it, and then slipping it on the shaft free of stresses is the way it should be done. The results of overheating a bearing are increased maintenance cost, increased safety risks, and more equipment downtime.

Proper heating methods and best practices should be applied to correctly install bearings.  Induction heaters such as SURETHERM can help eliminate induced bearing defects due to poor fitting and improper mounting techniques.  Induction bearing heaters provide increased safety, increased efficiency and reduce the risk of bearing contamination and damage that can result from using brute strength, oil baths, blow torches or other improper methods of heating bearings for proper installation.

Here are some conventional methods that are used in Industry and why they are not the way to install bearings:

Blow Torch
 – No temperature control
– Risk of over heating
– Grease leaks out of bearing
– Tension in material

Hot Plate
– No temperature control
– Risk of over heating
– Grease leaks out of bearing
– Tension in material
– Dangerous (plate stays hot)
Oil Bath
– Slow heating process
– New grease cooks out of bearing
– Dangerous (hot oil)
– Environmentally unfriendly
Oven
– Slow heating process
– High energy consumption
– Grease leaks out of bearing

by Bernd Seidenthal CRL

It seems that every maintenance department has at least one Hercules that uses more muscle than technique to complete maintenance activities.  Brute force and strength are occasionally required to complete a task.  Having Hercules around is important when those moments arise.

However,  applying care and good technique are usually better. Over 90% of rotating equipment has defects at startup that result in equipment failure.  One of the reasons arises from making bearing installation a herculean task and not using proper technique.  Excessive force applied during bearing installation can introduce defects that lead to premature equipment failure.  Instead of beating the bearing on with a sledge hammer, gently heat it up on an induction heater, automatically demagnetize it, and then slip it on. If Hercules did the job, then the bearing and equipment are doomed to failure from the moment of startup.  This results in increased maintenance cost, increased risks, increased equipment downtime.

Installing equipment bearings should not be a herculean task.  Instead, proper technique and best practice should be applied to correctly install bearings.  Induction bearing heaters like SURETHERM can help eliminate induced bearing defects due to poor fitting and improper mounting techniques.  Induction bearing heaters provide increased safety, increased efficiency and reduce the risk of bearing contamination and damage that can result from using brute strength, oil baths, blow torches or other improper methods to heat bearings for proper installation.

by Trent Phillips