Drilling holes on cnc

[dfox1787]

dfox1787,

Perhaps I missed something, but I don't see any reference to the material you want to drill. That is very important in my opinion. The fact that you have ER collet is not a problem, you just need to buy a set of collets since those are not like a drill chuck, you need a number of those. I have ER11 so I can't drill anything larger than 7mm with drill bits, which is OK for my needs, but of course, even I must have a large number of collets. I am drilling holes from 0.3mm up to 6mm with different drill bits, depending on the material I need to drill in, which can be PCB, aluminium or plastic. Of course, wood and similar is also OK. I also don't know why you feel you are limited to 10k rpm. The recommended lowest rpm for high speed 24k rpm spindles is 6k rpm but I have absolutely no problems to go below that as well.

Drilling starts at 2,5 minute mark.




In that clip I am drilling with different, standard (I think Cobalt) spiral drill bits, from 1.5mm to 5mm and in that video the lowest rpm is 5800rpm, but in aluminium I went as low as 3800 rpm also and that caused no issues at all. What is important is to use sharp and good quality bits. I use no liquid cooling at all and have no issues with welding, but if I have to drill many holes I let the bit to cool now and then.

Drill aluminium mainly. However i would need collets that would fit say 2.5mm drill bits so the hole can be tapped. Myabe i just need some high quality bits for the cnc. Its just the high speed of the spindle that concerns me.