Welcome to the forum, Jeremy.
How old are the cutters? I have heard that bearings do not have a long life.
Are the cutters from Gifkins or the very early cutters?
I do not use my cutters very often and in fact have used the bearings on other 1/2" shank cutters.
When I have seen Roger Gifkin using the jigs, he seems to to be running at high speed, so I doubt that is an issue.
You say this is the second bearing, so I am assuming you are using a third party bearing, not the original?
I don't mind if other members disagree with my comments.
I don't profess to know everything, and I may learn something new.
"Never attribute to malice that which is adequately explained by stupidity."
Last edited by jw2170; 06-05-2014 at 06:51 PM.