I'm using a 0.7mm bit.I think that at 35k the bit would overheat in no time, but the "right" speed depends on the bit size you´re using.
And if it's sharp or not..I think that at 35k the bit would overheat in no time, but the "right" speed depends on the bit size you´re using.
Valid points.. The runout/bearing fit/finish on Dremels is horrible (but to be expected for the cost)Technically a really small diameter drill should run at really high speeds like 25-35k.
BUT, based on my Dremel experience, the Dremel buzzes really bad at high RPM, and that shakes the tiny drill around and causes other problems like really irritating noise and reduced brushes and bearings life, ozone you breathe in from the brush arcing etc etc.
Personally I drill with a small drill stand for stability, and fairly low RPM maybe 10-15k. It takes a fraction longer to drill each hole but everything else is much better.
Technically a really small diameter drill should run at really high speeds like 25-35k.
BUT, based on my Dremel experience, the Dremel buzzes really bad at high RPM, and that shakes the tiny drill around and causes other problems like really irritating noise and reduced brushes and bearings life, ozone you breathe in from the brush arcing etc etc.
Personally I drill with a small drill stand for stability, and fairly low RPM maybe 10-15k. It takes a fraction longer to drill each hole but everything else is much better.
theres some info here:
http://www.pcbsupplies.co.uk/index.php?option=com_content&view=article&id=140&Itemid=124
I cant remember where i read it, but im sure the relationship of speed is related to diameter.. in that the larger diameter means using a slower rpm as the rotational velocity of the flutes increases.. (that said i might be completely off base, but the theory is sound)