518-283-8002

Email Newsletter icon, E-mail Newsletter icon, Email List icon, E-mail List icon Sign up for our Email Newsletter

Translate This Page

PKB Blogs

Get PKB RSS Feed

Newsletter Facebook LinkedIn Twitter YouTube RSS
ISO 9001:2000 Certified Quality Management System

How To Guide: Measuring PKB Ball Bearing Dimensions With A Micrometer

Posted By: Nancy Cogliandro, Marketing Director, PKB (Nancy, pacamor at msn dot com)   08/03/2017

 

How To Guide: Using a Handheld Micrometer to Measure PKB Miniature and Instrument Ball Bearings

Pacamor Kubar Bearings (PKB) is continuing our HOW TO GUIDE series with a guide for using a Handheld Micrometer to measure Miniature and Instrument Ball Bearings.   

For the most accurate measurements, Miniature and Instrument Ball Bearing dimensions should be measured with a calibrated Air Gauge.  A good second option is a calibrated Optical Comparator.  On occasion, it may be necessary to use a calibrated Handheld Micrometer to double check a measurement or for simple verification while working in the field.   

While PKB strongly recommends the use of an Air Gauge or an Optical Comparator, we also understand the usefulness of a Handheld Micrometer in certain situations.  We hope that you and your inspection department will find this tutorial helpful.

How To Guide: Using a Handheld Micrometer to measure Miniature and Instrument Ball Bearings

micometer_135_01
 

Using a micrometer on a delicate object, like miniature and instrument ball bearings, is very different from using a micrometer on a solid object.  The reason for this is miniature and instrument ball bearing rings are usually quite thin and flexible. 

Improper micrometer use allows for ring deformation and inaccurate micrometer readings. 

To measure a miniature or instrument ball bearing ring without damaging or deforming the ring, it is advisable to use the micrometer as a GO/NOGO gauge.    

CHECK THE MINIMUM TOLERANCE OF THE DIMENSION BY USING THE MICROMETER AS A GO/NO GO GAUGE 

1) Twist the ratchet just until the micrometer gauge reads the minimum tolerance for the dimension to be measured.  

   a. Do not adjust the micrometer while the bearing is in between the anvil and spindle.

   b. Do not squeeze the bearing in between the anvil and spindle head as that may distort the ring.

2) Lock the micrometer.

3) Using proper bearing handling practices, place the bearing between the anvil and spindle of the micrometer.

4) Do not force the bearing into the micrometer. 

5) If the bearing does not fit easily into the micrometer, then the bearing exceeds the minimum tolerance for the dimension.

6) If the bearing fits easily into the micrometer, at the preselected minimum tolerance setting, then the bearing is under / less than the minimum tolerance for the dimension.

7) Remove the bearing from the micrometer and set it aside using proper handling techniques.  

CHECK THE MAXIMUM TOLERANCE OF THE DIMENSION BY USING THE MICROMETER AS A GO/NOGO GAUGE 

1) Twist the ratchet just until the micrometer gauge reads the maximum tolerance for the dimension to be measured.  

   a. Do not adjust the micrometer while the bearing is in between the anvil and spindle.

   b. Do not squeeze the bearing in between the anvil and spindle head as that may distort the ring.

2) Lock the micrometer.

3) Using proper bearing handling practices, place the bearing between the anvil and spindle of the micrometer.

4) Do not force the bearing into the micrometer. 

5) If the bearing does not fit easily into the micrometer, then the bearing is larger than the maximum tolerance for the dimension.

6) If the bearing fits easily into the micrometer, at the preselected maximum tolerance setting, then the ring is within the maximum tolerance for the dimension.

7) Remove the bearing from the micrometer and set it aside using proper handling techniques.  

See our Bearing Handling Practices and PKB Bearing Installation Guide for more information about proper handling and installation of PKB bearings.  

For further assistance with bearing selection and design, please feel free to contact our engineering team or look at our online catalog.

Pacamor Kubar Bearings manufactures DFARS approved FAA TSO-C149 Aircraft Bearings in our ISO 9001:2008 & AS9100 Rev C certified factory in Troy, NY.   

We look forward to working with you. 

 

Bookmark and Share

Post a Comment

 

 

Posted by: Bradley Irwin, Bearings Inc., www.bearingsinc.net (brad.irwin@bearingsinc.net), 2013-12-01 22:19:48

What makes a calibrated air gauge better than a calibrated Optical Comparator? And can you please tell me where I can get those? Thank you in advance. Hi Brad, Thank you for commenting on this blog. One recognized brand, of air gauges, is Federal. You can find out more information from many of the companies that sell these gauges. We refer you to their expertise as PKB does not manufacture or sell gauges. Admin response 4-28-15

 

 

Posted by: peter barnett, pres, mmb bearing (pbarnett@mmbbearings.com), 2013-10-07 11:31:08

what about measuring the bore? Hi Peter, Thank you for your comment. There are external and internal micrometer types, depending on your requirements. Admin response 11-18-13

 

Post a Comment