It may be a rolled drill bit (generally black finish) or a ground bit ( generally bright finish) It may have a thin web or a thick web, it may have light or heavy lands. Look at a humble twist drilldrill, it may be 118 or 135 deg point angle, it may be split point or conventional point or one of many variations ~ Racon point anyone? So, given we are using small machines, at least compared to industrial ones, Drilling is your friend in terms of time saved machining.ĭrill to remove material whenever possible one might say.ĭrilling may not be a precise opperation, but it certainly seems to be a mature & vast one. "Drilling is the most efficient metal removal opperation"~ another internet quote. Try as i might, on my mini lathe or mciro mill an X mm sized hole always seems to come out about 4 thou (0.1mm oversize) I now have various "point 9" drills for the common mm sizes. Oft times a drilled hole is 'good enough.' Seems on further inspection if you want a precisely round, precisely sized hole you need to bore or ream it.īut we still want drilled holes as precise as we can make them? "Drilling is not a precision opperation"~ one quote i found on the internet which deflated me somewhat. Turned out my headstock/tailstock alignment was poor.if your having problems drilling on your lathe then start there.but i'm jumping ahead of myself,Īs a novice i just didn't know.this lead to many hours internet research in search of the truth & a solution. Small bits flexed alarmingly, mid sized bits seemed ok.ish, larger bits wanted to waggle the tailstock quill! I had much trouble drilling with the mini lathe when i started out. I'm definitely OCD regards drill bits.I've probably acquired way too many, but still crave more.
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