- Joined
- Dec 3, 2012
- Messages
- 3,672
Has anyone drilled the current replacement Andover Norton rocker spindles ? (To eliminate the overhead rocker oil line)
I don't mind a challenge but these seem hard all the way, even a ARTU drill failed starting down the drilled bore (it wouldn't start) as did a cobalt drill.
A test on an old spindle starting down the bore worked fine with a basic HSS drill.
Admit defeat before even starting ?
I even watched the JC video again but even with that fresh charge of optimism, not a microscopic swarf to be seen.
Spark eroding them seems a little over the top.
I don't mind a challenge but these seem hard all the way, even a ARTU drill failed starting down the drilled bore (it wouldn't start) as did a cobalt drill.
A test on an old spindle starting down the bore worked fine with a basic HSS drill.
Admit defeat before even starting ?
I even watched the JC video again but even with that fresh charge of optimism, not a microscopic swarf to be seen.
Spark eroding them seems a little over the top.