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About Tridex Indexable Drills

Coolant Thru Indexable Drills

  • 100% Compatible with inserts for KOMET® KUB-IT™ drills & Kennametal® DFT-_ _ 84° Trigon drill inserts.
  • Black oxide surface to prevent against rust and corrosion.
  • Length to diameter ratios are kept optimal tool overhang is minimized and tool rigidity, accuracy and deflection are minimized even in deeper holes.
  • Spiral flutes to improve chip evacuation while keeping tool strength intact.
  • Insert pockets are precisely positioned to keep cutting forces low and evenly distributed thus -lower axial pressures are realized. The net result of this is minimal tool deflection which in turn produces straighter holes regardless of whether the surface being drilled is concave, convex or is a low angle surface.
  • Trigon Inserts - our unique 84° nose angle Trigon inserts provide the strength of a square insert with the versatility of a triangular insert. The 8° positive relief angle provides for easier cutting by using positive cutting action. The 156° angle between cutting edges - provides twofold benefits - eliminates the need for spotfacing or pre-centering before drilling and can be indexed 3 times.
  • 100% Guaranteed against defects and backed by our Industry Famous guarantee.
  • Manufactured from H13 steel for superior tool toughness and strength.
  • 3 Methods Of Coolant Entry: Rear Entry, coolant supply through the back of the shank. Side entry, coolant supply through the side of the tool. Through the holder, for Mori-Seiki and other machines, coolant supply through the slot on the shank.

Indexable drills are designed strictly for roughing and as not meant to be used for finishing. Tolerances of +- .005” and finishes of 250 rms are normal.

FIXTURE RIGIDITY is extremely important when using indexable drills. Workpieces should be of adequate strength – flimsy workpieces will cause drills to be rendered almost ineffective due to high horsepower requirements.

RUNOUT must be checked with the drill in the toolholder. Position the drill such that the inboard station is positioned below center radially. This allows the inboard insert to cut past the center. Using a dial indicator check the drill for location – if the location varies more than .002” at the holder and/or .006” at the cutting edge of the drill then the drill and/holder must be repositioned or the TIR of the holder must be checked/adjusted.

ADEQUATE COOLANT is essential when using indexable drills. Maximum heat is produced in a small area at the bottom of the hole being drilled. In general 10-20gpm at 45psi of coolant is required during drilling. When drilling deeper than 1X drill diameter, coolant through the drill is essential - flood coolant cannot perform satisfactorily at depths beyond 1X drill diameter.

PROPER CHIP CONTROL is absolutely necessary to remove chips, this improves hole tolerance and finish and also improves tool life. Adjust speed and feed to produce “figure 9” chips for optimal chip removal – longer chips will lead to chip buildup in the drill flutes and chip recutting and eventual drill failure. Increase speed (within limits) if chips are too short. If chips are still unsatisfactory, reduce feed.Decrease speed or increase feed if chips are too long.

OFFSETTING DRILLS with 2.5:1 length to diameter ratios, in a positive direction, has proven to beneficial when using indexable drills on machines with inadequate coolant supply. Offsetting will reduce chatter and improve surface finish. Offsetting is also useful when drilling a slightly oversized hole. This allows for drilling a larger range of hole diameters with a minimum of drill diameter.

HORSEPOWER A machine with at least seven horsepower is required to run an indexable drill.

SBM Indexable drills are not designed to be used with stacked materials or laminates – severe tool damage and loss will occur if used with such materials. On some CNC machines, the rapid rate of tool positioning does not allow enough time for coolant flow to begin prior to drill contact with the workpiece. If the drill begins cutting without coolant, even for a second or two, insert life can be greatly reduced. Adding a short dwell in the program, to assure coolant flow BEFORE workpiece contact, will considerably increase insert life and drill performance. The slug produced by drilling through a workpiece can sometimes become jammed between the drill and workholding device. To minimize the likelihood of this happening, provide ample clearance in this area.

To help insure the proper placement of the insert you should hold the insert in place with your thumb and index finder while tightening the torx screw with your other hand.
*KOMET®, Kub-It™ and Kennametal® are trademarks of their respective companies.