Technical Information
Drill Breakage Analysis
1. Check the tip geometry 2. Check the flute lengths is at least longer than drilling depth +1.5XD
3. Recondition promptly 4. Add pilot hole drilling 5. Improve system rigidity (Work piece / tool)
Drilling Wear and Trouble Shooting
Burr on the hole exit
Bad surface finish
● Blunt cutting edge ● Drill tip outer corner chipped or worn
● Check edge wear ● Overcoated
Entry position out of tolerance
Oversized holes
● Check edge geometry ● Check tool's cutting edge & chisel edge
● Check edge geometry ● Overcoated ● Check tool's chisel edge
Check Coolant Supply
For solid carbide drills, internal coolant is always recommended. When the drill length is over 5xDc, internal coolant is essential. Ensure the coolant is with sufficient pressure and aiming to the correct position.
Bad coolant supply
Good coolant supply
Good
Better
Three coolant pipes should be directly towards the drill tip when it's possible.
479
Made with FlippingBook - Online Brochure Maker