Hello people
I have a little problem…
I have to drill a 5mm borehole 75mm deep in an aluminum plate.
We tried to do it with a VHM borer with IKZ and with straight span channel. But it lubricates.
We made it at Hermle U1130 with 40 bar IKZ. But it doesn’t look, as it should.

Could anyone suggest anything? It would be great!!!

Thanks a lot…

Flubber