where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

508 views
Technical Discussions
xander
xander
05:22 Jul-20-2004
defects on bearingraceways

Hello,
Does anyone have a suggestion where to find criteria for rejection or approval of defects like nicks, dents or scratches on hardened carbonized raceway surfaces.
I already have ANSI B3.2-1992

thanks
xander


 
 Reply 
 
Godfrey Hands
Consultant,
PRI Nadcap, United Kingdom, Joined Nov 1998, 307

Godfrey Hands

Consultant,
PRI Nadcap,
United Kingdom,
Joined Nov 1998
307
05:05 Jul-22-2004
Re: defects on bearingraceways
----------- Start Original Message -----------
: Hello,
: Does anyone have a suggestion where to find criteria for rejection or approval of defects like nicks, dents or scratches on hardened carbonized raceway surfaces.
: I already have ANSI B3.2-1992
: thanks
: xander
------------ End Original Message ------------

Hi Xander,

Many bearing manufacturers will have their own specification for acceptance of nicks, dents and scratches on bearing raceways.
They keep this information proprietary, so it will be very difficult to get information from them.

The main cause of failure from surface breaking features such as you describe are the effect of the hydraulic pressure that the lubricant applies on the raceway as the feature is overrolled. This holds valid also for raceway surface breaking cracks.

For slightly sub-surface defects, a different failure mechanism comes in to play. This is the effect of compressive stresses on the Hertzian zone, and depending on the rolling element diameter can be between several hundredths of a millimetre to a small number of millimetres deep. This means that inclusions in this region are not recommended, and may shorten the bearing life.

I suggest that you request some information from a bearing manufacturer, and offer to hold the information obtained as confidential.

Regards,

Godfrey Hands



 
 Reply 
 

Product Spotlight

Customized Probes and Transducers

With a strong development department and our own piezocomposite production, we accompany you from th
...
e first product idea to serial production. Our scientists are continuously researching new methods in the field of ultrasonic measurement technology. The progress achieved enables us to offer you optimal solutions.
>

Echomac® PA Tube Weld Tester

The new robotic Echomac® PA TW is an operator friendly test system for detecting weld zone defects
...
in tube and pipe caused by scarfing or welding processes. Electronic scanning ensures that the entire weld zone is covered without the need for mechanical movement or operator adjustment.
>

GUL Subsea Solutions - Screeening & Monitoring

To inspect new and existing subsea lines, you need proven technology and experience. GUL offers it's
...
technology to solve this challenge: GUL Subsea and gMAT Transducer Rings.
>

Portable Ground Penetrating Radar - Proceq GP8000

The Proceq GP8000 portable ground penetrating radar instrument is the beginning of a new era in ND
...
T. The outstanding, patented ultra- wideband technology combined with a compact wireless probe delivers unmatched industry performance. Proceq GP8000 is the world’s first large-scale inspection solution that utilizes Augmented Reality in industrial applications.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window