[QuinnSjoblom]

ive run into a limitation with my 2.2kw spindle. Yesterday i was milling some aluminum mounts for my vise which needed 30mm deep 8mm diameter holes for the bolts. At 6k rpm the surface speed is just way too high. i got through it eventually by starting small and going through 4 drill sizes so the larger drills didnt need to remove much material but it still wasnt happy at all drilling 8mm at 6k. If the hole wasnt so deep i might just drill once with something smaller and then helical down with an endmill, but its just too far. Even if i had a long enough endmill, i dont think the chips would find their way down the smaller hole. Any of you guys with these 6k rpm minimum spindles have a good strategy for drilling large deep holes in aluminum?

[ger21]

I use a short 1/8" bit in the router to drill a 1/4" deep hole, then take it to the drill press.

[CNCMAN172]

If you try carbide drill bits you will see they will drill that deep with no issue at 6K. It is night and day difference drilling aluminum with Carbide bits or standard steel drill bits, you will shocked.

Russ