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22-08-2010 #1
I think the main problem is drilling thro the hardened surface, lots of heat etc. and possible distortion. If it was me I would slow grind the surface with water or oil and then slowly drill with lots of coolant.
its only the heat that will bugger them up
Huumm didnt read the other post on stress relief, could be a problem, needs somone to try it....... how did you get on john?????Last edited by Ross77; 22-08-2010 at 01:32 AM.
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