electricpete
Electrical
AFBMA 9 defines dynamic/rotating quantities (no subscript), and static/stationary quantities distinguished by a subscript o.
In particular:
dynamic quantities: Pr=XFr + Yfa and rating C
static quantities: Por = XoFr + YoFa, and rating Co
Paragraph 5.3.2 of AFBMA9 (1990) states: "The life formula [based on dynamic load and dynamic rating] gives satisfactory results for a broad range of bearing loads. However, extra-heavy loads may cause detrimental plastic deformations at the rolling element/raceway contact. The user should therefore consult the bearing manufacturer to establish the applicability of the life formula in cases where Pr exceeds Cor or 0.5Cr, whichever is smaller."
* My question: shouldn't Pr be Por in the above quote?
If not, is there any purpose to calculating Por=XoFr + YoFa…. I don't see any of these quantities used anywhere else in the guide.
In particular:
dynamic quantities: Pr=XFr + Yfa and rating C
static quantities: Por = XoFr + YoFa, and rating Co
Paragraph 5.3.2 of AFBMA9 (1990) states: "The life formula [based on dynamic load and dynamic rating] gives satisfactory results for a broad range of bearing loads. However, extra-heavy loads may cause detrimental plastic deformations at the rolling element/raceway contact. The user should therefore consult the bearing manufacturer to establish the applicability of the life formula in cases where Pr exceeds Cor or 0.5Cr, whichever is smaller."
* My question: shouldn't Pr be Por in the above quote?
If not, is there any purpose to calculating Por=XoFr + YoFa…. I don't see any of these quantities used anywhere else in the guide.