Page 146 - HOLE MAKING CATALOG p001-148

MULTIFUNCTION TOOLS USER GUIDE

User guide for DRG-MF User Guide for Turn-Mill Machines

Coolant Pressure Insert Positioning
• Apply above 6 Bar in 2.25xD tools (optimal pressure
For drilling, cutting edge should be positioned in the center
is above 10 Bar). of tool body.

Radial Adjustment (off-center drilling) Correct Correct Wrong
• Radial adjustment is dependent on drill diameter Cutting edge

for drilling

Optimization of Chip Shape

• Apply high-speed machining on low carbon steel Setup Cutting edge
• Produce thin chips, as most problems for drilling

are caused by thick chips
• Regulate chips produced by machining

medium-to-high carbon steel
• If too tight, either increase speed and reduce

feed, or reduce speed and increase feed
• If too long, reduce speed and increase feed

Tool Drill Dia. Dmin Dmax Core Ø Ø/2
DRG-MF-10 10 9.82 10.60
DRG-MF-12 12 11.82 12.60 Check formation of core and its size after drilling 3 mm to
DRG-MF-14 14 13.80 14.60 6 mm depth. The diameter of the core should be within
DRG-MF-16 16 15.76 16.50 0.15-0.45 mm.
DRG-MF-20 20 19.80 20.60 Adjust Y-axis of the tool body by using the new adjustable
DRG-MF-25 25 24.80 25.80 clamping unit (if available) or rotate the tool body 180°
DRG-MF-32 32 31.80 33.00 and secure it into a turret. Check the core again.

Troubleshooting Important: If a core does not appear, this can cause
breakage of insert vibration when drilling or turning.
Problem Solution If the size of the core is over the recommended
Chipping size, it will cause overload and vibration.
caused by • Increase cutting speed
built-up edge • Reduce feed Angular error
• Check tool and workpiece rigidity
Excessive • Reduce tool and workpiece overhang Warning: As the drill
flank wear goes all the way through
• Reduce cutting speed a workpiece, it ejects a
Edge • Use a harder grade (special) disc. For worker safety,
deformation • Increase coolant flow guards should be used.
• Check cutting edge height
Poor surface
quality • Reduce cutting speed
• Use a harder grade (special)
Long chips • Increase coolant flow
Tight chips • Reduce feed

Vibrations • Reduce feed
• Increase coolant flow
• Check tool and workpiece rigidity
• Increase cutting speed

• Increase feed
• Reduce cutting speed
• Increase coolant flow

• Reduce feed

• Check tool and workpiece rigidity
• Reduce tool and workpiece overhang
• Reduce cutting speed
• Increase feed
• Check cutting edge height
• Reduce feed and increase cutting

speed on very soft materials

144 ISCAR