Hello Sandancer,
free hand drilling or in a machine, if the former then it's very easy to snap small drills.
Alec
drilling small holes by hand or pedestal drill requires a fast speed and light steady pressureIt is if you try too hard, don't press on too hard, let the drill do the work, use some lube and keep the speed down.
http://www.ollivier.nl/html/drillspeedchart.htm smaller the drill higher the speed apart from cutting hard material . larger the drill slower the speed . but as long as your happy with what suits u bestSmall drill bits don't need high speed, in reality. I've never understood why that is said so often and by so many, to be honest. Any size drill bit can be used very well at extremely slow speed. The sharpness of the bit is key. Everything from 3mm to 10mm I frequently use in a hand powered drill on everything from wood to metal, so I'm likely going a maximum of 60RPM, and never once has slow speed been detrimental to cutting. If anything, the drill bit will stay sharp far longer than when being run at higher speed.
Plus, I can only ever recall snapping a couple of drill bits, they were around 1.5mm bits, and that was through inadvertently putting sideways pressure on the bit. It wasn't due to the speed or material being cut.
http://www.ollivier.nl/html/drillspeedchart.htm smaller the drill higher the speed apart from cutting hard material . larger the drill slower the speed . but as long as your happy with what suits u best
Do you not grab too thick a shaving at too slow a speed ......no?
Suppose you don't if the pressure is light?
Wasn't arguing the point or such for the sake of arguing. I know that it is the recommended norm, but the thing is I've no idea why. It makes absolutely naff all difference to effectiveness of cut. The only thing higher speed does is dull the tip more quickly and generate excess heat.
Small drill bits don't need high speed, in reality. I've never understood why that is said so often and by so many, to be honest. Any size drill bit can be used very well at extremely slow speed. The sharpness of the bit is key. Everything from 3mm to 10mm I frequently use in a hand powered drill on everything from wood to metal, so I'm likely going a maximum of 60RPM, and never once has slow speed been detrimental to cutting. If anything, the drill bit will stay sharp far longer than when being run at higher speed.
Plus, I can only ever recall snapping a couple of drill bits, they were around 1.5mm bits, and that was through inadvertently putting sideways pressure on the bit. It wasn't due to the speed or material being cut.
If you find it a bit more difficult than a lot of us to work with what is the norm and has been the norm for ermmmmmmm scores of years, then there could well be something wrong with the way you are going about it.
The whole point of this is efficiency. My last job before Christmas involved drilling in excess of 400 off 1mm holes. Now why would want to use a lower rpm and take 6 seconds per hole when i could drill each one in two seconds? That's the difference of 1 hour to complete the job or 3 hours. It goes without saying all i would doing is costing myself money. The drill is still crispy sharp under an eye glass and will most likely do another few bathes of parts.