ADO Advanced Performance Coolant–Through Carbide Drill
Stable Drilling with Long Drills
The runout of a gripped cutting tool increases with the speed, as shown in the graph on the right. To ensure a higher level of work stability, OSG recommends making +0.0008”-0.0031” (+0.02- 0.08mm) pilot holes and inserting long drills stopped or at low speeds. The reason for this is made evident in the graph on the right. Increasing the speed increases the dynamic runout, posing a higher risk of the drill not fitting properly in the pilot hole. Therefore, reducing the speed and minimizing static runout is the recommended drilling method for long drills.
0.0393
0.0031
0.0023
0.0007 0.0011 0.0015
0.0007 0.0015 0.0003 0
0
1,000
3,000
5,000
(min -1 )
RPM
Static runout
0”
0.0003” 0.0007” 0.0015”
RPM (min -1 )
1,000 0.0001 0.0005 0.0009 0.0018 3,000 0.0005 0.0010 0.0014 0.0025 5,000 0.0012 0.0015 0.0019 0.0034 Dynamic runout values for Ø6mm 30xD drill.
311
osgtool.com
Drilling Technical
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