Oil holes

Objective

To reduce the often very long machining time of the deep holes in small diameters with no diameter tolerance (in oil connector holes). In many cases, HSS deep hole drills are still used.

Result

Solid carbide drills with C7 coating ensure increased speed and feed and reduce the cycle time considerably while giving increased lifetime. Very narrow hole tolerances and a completely safe process.

Machining process

Step 1: Pilot drill

Drawing no. 289411.0400, N = 9550 rpm, Fn = 0.2 mm/rev. 

Step 2A: Carbide gun drill

Drawing no. 89502.99.00, N = 8000 rpm, Fn = 0.04 mm/rev.  

Step 2B: Solid carbide deep hole drill

N = 6000 rpm, Fn = 0.3 mm/rev.