[Fwd: [Fwd: JPOR: Used gear set questions]]

[samfans <samfans@xxxxxxxxx>]

Jeff,

I asked my Dad, a mech. eng. about the used gears, and here's what he said:


> Bill
> Wouldn't touch them with a barge pole.
> Tooth face loadings in gear sets are high in any case, but in hypoid
> gears not only is the face loading high but there is a very high sliding
> component as well. So if there are any imperfections on the surfaces
> there will be stress concentrations and accelerated wear.
> Magnafluxing will certainly tell you the length of the crack but will
> not give you detail of the depth of the crack, you would probably have
> to go to destructive testing to learn that - not a good move?
> Sounds like these gears either had faulty heat treatment, improper set
> up and/or lubrication.
> Fundamentally cracked gears are scrap.
> Love
> R