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28-04-2010 #1
Don't bother centre drilling, centre drills are a throw back to when you used dead centres in a lathe and the pip is to hold white lead as a lubricant.
Unless you actually need a centre hole for a lathe, use spotting drills then the size drill or even better is to buy a few good quality stub drills and just use these to start and finish the holes, saves hours of time and being short and stubby they are hard to breakJohn S -
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28-04-2010 #2
Only used centre drill to pre-chamfer the holes before drilling and tapping, just happen to have one next to the machine that was the right size.
Seemed like a good idea at the time!
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28-04-2010 #3
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28-04-2010 #6
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