Drilling a rocker shaft

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pete.v said:
I can kind of see where JLM is coming from. Like, "what wrong with the old stuff" and " if it ain't broke, why fix it". It's neither a sin to think forward nor to keep old school in your heart.
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It's strange, as I would've expected JML to be the first to condemn the original flimsy external plastic cross-over pipe design (that's been known to chafe through, blow off the spigots and occasionally melt :shock: ) as extremely "piss-poor" engineering with the usual scathing attack directed toward the "idiots" responsible, but on this occasion it seems not! :lol: :wink:
 
L.A.B. said:
pete.v said:
I can kind of see where JLM is coming from. Like, "what wrong with the old stuff" and " if it ain't broke, why fix it". It's neither a sin to think forward nor to keep old school in your heart.
Click to expand...

It's strange, as I would've expected JML to be the first to condemn the original flimsy external plastic cross-over pipe design (that's been known to chafe through, blow off the spigots and occasionally melt :shock: ) as extremely "piss-poor" engineering with the usual scathing attack directed toward the "idiots" responsible, but on this occasion it seems not! :lol: :wink:
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Yes, I see your point. If I may be so bold to say, your affinity for JML is scant at best. :p
 
comnoz said:
Cheesy said:
When I did mine I used a small ball end carbide bit with the lathe making scary turbine like noises as it got upto speed, then used compressed air to keep it cool while cutting. The hardening on mine is quite deep, over 1mm.
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Yeah, many years ago I used to use a drill press with a ball nosed carbide burr mounted in the vise and the shaft mounted in the spindle. It works fine- just not as fast as an end mill in the lathe. Jim
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Unless you have a well maintained and stiff drill press, I would imagine a drill press would chatter pretty bad for something like this, regardless of whether one was chucking up the cutter or work piece.
 
With a view to carrying out this mod, could I just grind through the hardness layer on the end of the spindle with an offhand grinder prior to drilling?
 
gripper said:
With a view to carrying out this mod, could I just grind through the hardness layer on the end of the spindle with an offhand grinder prior to drilling?
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YES! - MUCH EASIER THAT WAY.

The surface hardness is not very thick.
 
gripper said:
With a view to carrying out this mod, could I just grind through the hardness layer on the end of the spindle with an offhand grinder prior to drilling?
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I'm sure it's possible. You don't want to shorten the shaft length but as long as you used a stone and can grind in at least 1/16th inch -more or less in the center -it would be fine.
Be careful when you drill it. If the bit hits hardened metal as it is going through the end -it will break it off. Jim
 
I like to do as much as possible myself-making parts, painting, assembly and setup. But when it comes to something that takes precision tools AND experience, it's best left to experts who have the right equipment and get paid for their good work. Trying to get by cheap will put your ass in a jam every time.
 
You are right Danno but hardened steel lends itself to grinding rather than cutting. I've got a lathe, small milling machine and some 45 year old knowledge from my engineering days. Once I've ground through the end hardening which doesn't need to be there, a HSS drill will go though pretty easily. One less banjo/place for oil to get out.
 
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