Drilling out a wheel hub

Joined
Jun 24, 2022
Messages
5
Hey, any thoughts on drilling out a wheel hub, super hardened steel. Special drill bit? grinding?
 
Joined
Jan 16, 2011
Messages
545
Location
Vilvoorde / Flanders / Belgium
Normaly, the hub itself ain't ultra hard. It's the bearing races. And there, grinding is the only decent DIY solution.
If you have acces to a spark erosion machine, that's better of course.
 
Joined
Jun 24, 2022
Messages
5
Yes, it is the bearings races I'm after, I just want to enlarge the hole (7/16 I think) to 1/2"
Thanks for the reply
 
Joined
Mar 2, 2022
Messages
21
Location
Nottinghamshire. UK
Not that I've tried, but would a tungsten drill at slow rev and slow feed work? Would have to be dismantled in a lathe to stand a chance. If you don't have a lathe or a carbide drill forget the words of unproven wisdom.
 
Joined
Feb 7, 2008
Messages
3,762
Location
Nottinghamshire England
I tried to enlarge the hole in a bearing insert, drill and grinding stones , I didn't succeed.

However it did easily reduce the stones to dust ?

Paul
 
Joined
Mar 2, 2022
Messages
21
Location
Nottinghamshire. UK
While at Dale engineering we did enlarge holes in spherical bearings, (dismantled) in a cylindrical grinder, no bother. I've just sold my cylindrical grinder earlier this year!
 
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