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)
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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)
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