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 -

FI Test- und Messtechnik GmbH
a small high-tech company. We are focused on non-destructive measurement.

449 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


    
 
 
Godfrey Hands
Engineering,
PRI Nadcap, United Kingdom, Joined Nov 1998, 291

Godfrey Hands

Engineering,
PRI Nadcap,
United Kingdom,
Joined Nov 1998
291
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



    
 
 

Product Spotlight

Exertus Dual 120

The Exertus Dual 120 Projector has the ability to accept Iridium 192 sources or Selenium 75 source
...
s. This projector incorporates design and safety features that make it flexible, compact and lightweight. The Projector is lighter than most of its competitors. It incorporates an improved source channel, based on a new helicoidal design, which makes maintenance easier. The helicoidal design also allows smoother movement of the source assembly inside the device, making it easier for the operator and improving safety. The Projector also has a unique safety feature not found in competitive products. The source assembly locking mechanism is triggered by the source holder capsule at the front of the source assembly, thereby always assuring the operator that the source has returned to the safe position. The Exertus Dual 120 is ISO3999:2004 compliant.
>

High-performance Linear Phased Array Probes

Available to order from stock in a range of 5MHz – 7.5MHz and from 16 to 64 elements. Designed w
...
ith piezo-composite elements, Phoenix phased array probes provide high-resolution imaging to maximise sensitivity; accurate ultrasonic detection and sizing of defects in welds; and effective corrosion mapping. Housed in a rugged stainless steel case for on-site industrial NDT applications.
>

GUL QSR1® Scanning

How do you measure pipe wall thickness without direct access to the area? QSR® Scanning - Guide Wav
...
e Quantitative Short Range Scanning.
>

Swift & Scorpion2 - a state-of-the-art remote-control ultrasonic crawler

The Swift and Scorpion2 dry-coupled, remote-access ultrasonic crawler bring major efficiency and d
...
ata improvements to tank shell inspections and other structures such as vessels and offshore installations.
>

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