Carbide Tipped Drills Technical Information

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Drill Basics

  • Drills are end cutting tools used to produce holes when rapid removal of material is desired
  • Use shortest drill available for accurate hole location
    and minimum runout for maximum tool life
  • Non-coolant fed drills (conventional twist drills) are generally effective in holes up to 3 tool diameters deep. Peck cycles should be used for deeper holes to achieve better chip evacuation
  • Coolant fed drills should be used for production drilling of holes greater than 3 tool diameters deep
  • Coolant fed drills offer higher penetration rates, reduced cycle times, and straighter/rounder holes with better finishes
  • If non-centering drill is used, HANNIBAL recommends using a spotting drill for improved hole location
  • Spotting drill’s point angle should be greater than production drill’s point angle to prevent edge chipping and to ensure accurate hole location

Drill Selecting Guide

Twist Drills – Non-Coolant

  • Excellent up to 3 tool diameters deep
  • Use shortest length available
  • Excellent in non-ferrous materials and cast irons
  • Generally not recommended for drilling steels (use die drill or coolant drill instead)
  • See drill point selection

Die Drills

Coolant Fed Drills – Straight Flutes

  • Longer flutes for deep hole drilling
  • Produce straighter holes and better finishes
  • Excellent performance in many materials
  • See drill point selection

Coolant Fed Twist Drills

  • Better chip clearing ability in ductile materials and high density alloys
  • Spiral flutes permit higher feed rates
  • Excellent performance in most materials
  • See drill point selection

Core Drills

  • Used to enlarge cored, punched, or preformed holes
  • Capable of removing up to 30% of tool diameter
  • Produces near-reamed surface finish
  • Often eliminates need for final reaming or boring operation

Drill Tolerances

Tool Diameter Diameter Included Angle Lip Height T.I.V.
Plus Minus Plus Minus
Thru 1/8” .0000″ .0005″ 5° 5° .0020″
Over 1/8” thru 1/4” .0000″ .0007″ 5° 5° .0030″
Over 1/4” thru 1/2” .0000″ .0010″ 5° 5° .0040″
Over 1/2” thru 1″ .0000″ .0012″ 3° 3° .0050″
Over 1″ thru 1 1/2 ” .0000″ .0015″ 3° 3° .0060″

Drill Specifications

  • Carbide tip high temperature brazed to hardened tool steel body
    Smooth flutes for effective chip flow
  • Precision ground to insure concentricity of tip & body
  • Dimension & element tolerances conform to following standard, unless otherwise specified on selected styles: ASME/ANSIB94.11M * ISO * NAS 907 * USCTI
  • “Taper Shank No.” refers to American Standard taper series (formerly Morse taper series) per ASME/ANSI B5.10
  • Jobber length & taper length drills 1/2″ diameter and smaller are manufactured with an overall length tolerance of +1/4″, -1/8″

Drill Problem Solving Guide - Carbide Tipped

Avoid Problems By Careful Original Set-Up
MACHINE CONDITION Tool holder in good condition and secure part holding fixture
TOOL CONDITION Use cutting tool recommended for material being machined. Avoid excessive tool overhang.
FEEDS & SPEEDS Start with feeds and speeds recommended for material being machined
COOLANT Coolant flow must be adequate to avoid intermittent quenching and to flush chips promptly,
avoiding the recutting of hardened chips.
Drilling Problems Possible Causes Possible Solutions
1. CHIPPED CUTTING EDGE Excessive feed Reduce Feed
Excessive lip relief Reduce lip relief to provide smaller chisel angle
Vibration Frequently a worn drill bushing – Replace
Thermal cracking carbide Maintain adequate coolant flow at all times
2. SHORT TOOL LIFE Drill dwelling Maintain adequate feed at all times
Only one lip cutting Regrind with equal lip heights and chisel in center
3. DRILL WALKS OR DRIFTS Unequal lip heights Regrind with equal lip heights and chisel in center
Worn drill bushing Replace drill bushing
4. OVERSIZED HOLES Unequal lip heights Regrind with equal lip heights and chisel in center
Excessive lip relief Reduce lip relief to provide smaller chisel angle
Worn drill bushing Replace drill bushing
5. ROUGH FINISH Dull cutting edge Regrind with fine grit diamond wheel
Inadequate coolant Review type of coolant and maintain adequate flow

Drill Point Selection Guide:
Twist Drills, Die Drills, & Coolant Fed Drills

For Higher Penetration Rates, Longer Tool Life, & More Accurate Holes

TWIST DRILLS (NON-COOLANT) AVAILABILITY POINT GEOMETRY & USE ADVANTAGES
90º Included point (not spotting type) Special Order Cam relieved. Produces thinner chips for very ductile, soft materials (Chip Class 20 & 40). High lip relief for faster penetration. Less abrasive wear at corners.
118º Standard point Standard Cam relieved. For variety of materials Easily resharpened on standard equipment
118º Split point Modified Standard Cam relieved. Excellent web thinned point. Self centering. Split point acts as chipbreaker.
118º x 45º Double angle point Modified Standard Both angles cam relieved. For cast irons and abrasive materials. Reduces corner wear at point Reduces breakthrough burrs.
135º Split point Standard Cam relieved and split to NAS 907 standard. Excellent web thinned point. Self centering. Split point acts as chipbreaker.
135º x 45º Double angle point Modified Standard Both angles cam relieved. For cast irons and abrasive materials. Reduces corner wear at point. Reduces breakthrough burrs.
DIE DRILLS FOR HARD STEELS AVAILABILITY POINT GEOMETRY & USE ADVANTAGES
118º Negative edge point Standard For verry hard materials (50 Rc to 65 Rc). Longer tool life.
118º Positive edge point Standard For less hard materials (35 Rc to 50 Rc). Permits higher feed rates.
140º Negative edge point Standard For extremely tough materials (50 Rc to 65 Rc). Longer tool life
140º Positive edge point Standard For less hard materials (35 Rc to 50 Rc). Permits higher feed rates.
COOLANT FED DRILLS – STRAIGHT FLUTES AVAILABILITY POINT GEOMETRY & USE ADVANTAGES
125º Four facet point Standard Flat relieved point. Self centering – free cutting. Permits higher feed rates. Longer tool life. Closer hole tolerance.
125º x 45º Double angle, Four facet point Modified Standard Both angles flat relieved. Self centering – free cutting Reduces corner wear at point. Reduces breakthrough burrs.
COOLANT FED TWIST DRILLS AVAILABILITY POINT GEOMETRY & USE ADVANTAGES
125º Four facet point Standard Flat relieved point. Self centering – free cutting Permits higher feed rates. Longer tool life. Closer hole tolerances.
125º x 45º Double angle, Four facet point Modified Standard Both angles flat relieved. Self centering – free cutting Reduces corner wear at point. Reduces breakthrough burrs.
135º Split point Standard Cam relieved point. Excellent web thinned point. Self centering. Split point acts as chipbreaker.
135º x 45º Double angle, Split point Modified Standard Both angles cam relieved. Excellent web thinned point. Reduces corner wear at point. Reduces breakthrough burrs.

Coolant Fed Drills Technical Information

Why Use Carbide Tipped Coolant Fed Drills?

  • Deep hole capability
  • Higher feeds & speeds result in reduced drilling cycle times
  • Increased tool life versus non-coolant carbide or coolant high speed steel
  • Better quality holes – straighter, rounder & better finish
  • More efficient chip evacuation
  • Superior to solid carbide drills because tough tool steel bodies absorb shock loads

When To Use Carbide Tipped Coolant Fed Drills

  • Especially effective for holes greater than three tool diameters deep
  • Use on non-ferrous materials (chip classes 20 & 40), cast irons (chip class 60), medium & high strength steels (chip classes 100 & 120), and some high temp alloys (chip class 140) & stainless steels
  • When improved hole size & finish could eliminate secondary finishing operations (reaming or boring)

How To Select Coolant Pressure

  • Inadequate coolant pressure or volume can lead to tool failure – contact HANNIBAL for recommendations
  • High coolant pressure results in higher stock removal rates & longer tool life
  • High coolant pressure required to break through point vapor barrier created by chip forming heat at drill point
  • High coolant pressure required to effectively evacuate the high volume of chips produced by faster feeds & speeds
  • Coolant pressure requirement decreases with increase in drill diameter but requires more volume of coolant
  • Coolant pressure requirement increases with decrease in drill diameter but requires less- volume of coolant
  • Strongly recommend automatic drilling operation shutdown if coolant flow is interrupted
  • Use continuous coolant pressure system (non-pulsating

Drill Section Index and Comparison Chart

DESCRIPTION HANNIBAL CJT CLEV- ELAND FULL- ERTON GREEN- FIELD/ RTW IMCO MORSE NYTP PTD UNION
FRAC. PAGE METRIC PAGE TOOL TYPE
AIRCRAFT EXTENSION DRILLS
6″ Length, 135° Split Point 35 610
12″ Length, 135° Split Point 35 611 129
COOLANT FEEDING DRILLS
Short Length, Straight, 125° 4 Facet Pt. 20 20 652 171 2758
Long Length, Straight, 125° 4 Facet Pt. 21 21 650 170
Extra Long, Straight, 125° 4 Facet Pt. 19 658 172
Short Length, Twist, 125° 4 Facet Pt. 22 22 654 295
Short Length, Twist, 135° Split Pt. 22 22 655 296
Long Length, Twist, 125° 4 Facet Pt. 23 656 290
Long Length, Twist, 135° Split Pt. 23 657
CORE DRILLS
Straight Shank 40 41 620 5456
Taper Shank 40 41 622 410 2738 CD 8850 5454 5592
Straight Shank – For Steels 42 43 621
Taper Shank – For Steels 42 43 623
GLASS AND TILE DRILLS 44 680 162 761 GD 5467 PG6
HARD STEEL DIE DRILLS
Negative Cutting Edge, 118° Point 36 36 670 HD 5423 D000
Negative Cutting Edge, 140° Point 36 671
Positive Cutting Edge, 118° Point 36 36 672 150 760 40HD 4850 4041 5241
Positive Cutting Edge, 140° Point 36 673
Solide Carbide, 140° Point 37 893 155 50 1805
Spade Type, 120° Point 37 674 152 5420
Spade Type, 140° Point 37 675
JOBBERS LENGTH DRILLS
118° Standard Point 26 27 600 120 2727 40CT CTD 2850 5330 4011 D444 5249
135°Split Point 26 27 601 125
118°Standard Point- Tanged 28 29 690
135°Split Point- Tanged 28 29 691
MASONRY DRILLS 44 681-4 Yes Yes Yes Yes Yes Yes
REDUCED SHANK DIAMETER DRILLS
Hard Steel Die 38 670/672
Jobbers Length 38 600/601
Stub Length 38 640/641
Silver & Deming, 118° Std. Pt. 39 616 163
Silver & Deming, 135° Split Pt. 39 618
SPOTTING/CENTERING (CNC) DRILLS
90° Short or Rectangular Length 39 646/647
120° Short or Rectangular Length 39 648/678
140° Short or Rectangular Length 39 649/679
STUB LENGTH (CNC) DRILLS
118° Standard Point 24 25 640 110 5850
135°Split Point 24 25 641 115
TAPER LENGTH DRILLS
118°Standard Point 30 31 630 130 2745 40TL TLD 3850 5314 4013 D555 5520
135°Split Point 30 31 631
TAPER SHANK DRILLS
118° Standard Point 32 33 660 140 2740 40TLT TSD 6850 5302 4451 D999 5380
135° Split Point 32 33 661
Smaller Taper Shank, 118° Std. Point 33 668
8″ Extra Long Flute, 118° Std. Point 34 664
11″ Extra Long Flute,, 118° Std. Point 34 665
CENTERS
Brown & Sharpe- Half or Full 45 593/596 5293/6
Jarno- Half or Full 45 594/597 5294/7
Morse- Half or Full 45 592/595 790 5292/5 5800
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