raceway profile
raceway profile
(OP)
Hello,
I've a cylindrical bearing raceway for nine loose 0.2500" bearing balls that matches 7/32" radius gauge. My question is that whether that is correct and why? Is there a specification for designing such raceways?
Thank you
Pete
I've a cylindrical bearing raceway for nine loose 0.2500" bearing balls that matches 7/32" radius gauge. My question is that whether that is correct and why? Is there a specification for designing such raceways?
Thank you
Pete





RE: raceway profile
The internal dimensions are not, and may be regarded as proprietary by each of the multitude of manufacturers.
A radius gage may not tell you all there is to know,
- because it's a relatively imprecise tool,
- and the geometry of the race section may not be exactly circular.
Example: Kaydon 'X' ball bearings have ogival grooves, making them sort of equivalent to a pair of angular contact bearings, because that's how they are used; in a single installation to resist radial loads, axial loads, and moments produced by overhung radial loads.
I think the relatively large groove radius you report is intended to make the bearing relatively insensitive to misalignment, but that of course interacts with the actual major/minor diameter of the grooves and the ball size and the parallelism of the groove center to the bearing faces.
... and I am guessing, too. I know less than what you can find in the 'engineering' section of any bearing maker's thickest catalog.
Mike Halloran
Pembroke Pines, FL, USA
RE: raceway profile
The bearing described in the OP seems a bit unusual. There are single row self-aligning ball bearings, but they would typically have a much larger outer race profile radius than what the OP describes. The drawback of self-aligning ball bearings is that they have very limited load capacity, so it is more common to see two row self-aligning ball bearings.