COOLANT FED DRILLS
TECHNICAL INFORMATION
WHY - WHEN - HOW
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)