Page 120 - Demo

118 ISCAR GENERAL PURPOSE DRILLINGTroubleshootingIrregular Conditions for DR DrillsIf surface slope exceeds 5%u00ba, reduce feed by 50% during penetration or when exiting. It is preferred to pre-face the surface to eliminate slope.1 Drilling into a pre-hole reduces feed to eliminate deflection(1) of the drill body.2 Drilling an interrupted cut reduces feed during crossing to eliminate deflection(1) of the drill body.3 Insufficient stability of workpiece requires additional support. Reduce feed.(1) Deflection may be observed by a mark on the drill body.Note: For irregular applications, use DR drills with XOMT inserts as a first priority.Stacked PlatesDrilling operation is not recommended, but may be done by specially designed drills in 16-60 mm range. Apply standard cutting data.Note: For irregular applications, use DR drills with XOMT inserts as a first priority. Indexable Insert Drills - Troubleshooting DR Chips Chip Jamming due to Long Chips1 Increase feed. If drilling a very soft material, reduce feed and increase speed.2 Choose a geometry with a tighter chipbreaker for lower feeds (GF).3 Long chips that rotate around the drill are problematic. If chip formation can not be improved by changing the machining conditions, use a pecking cycle.Chip Jamming despite Short Chips1 Increase coolant pressure/volume.2 Reduce cutting speed.