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Drilling Technique for Optimal Performance

Drilling Technique for Optimal Performance. SIGN Conference 2009. Joel Gillard Karsten Zuendel Randy Huebner Portland, Oregon USA. Drilling Performance Factors. Cutting Edge. Cutting edge geometry for material drilling into: bone vs metal Cutting edge retention: hardness vs. toughness.

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Drilling Technique for Optimal Performance

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  1. Drilling Technique for Optimal Performance SIGN Conference 2009 Joel Gillard Karsten Zuendel Randy Huebner Portland, Oregon USA

  2. Drilling Performance Factors Cutting Edge Cutting edge geometry for material drilling into: bone vs metal Cutting edge retention: hardness vs. toughness Wood Bone Metal

  3. Drilling Performance Factors

  4. Drilling Performance Factors Drilling technique: feed & speed Tool life & Bone temperature Above 47oC for over 1 minute bone necrosis Eriksson et al 1984 Scand J PlastReconstrSurg 18:261–268

  5. Drill Testing Outcomes • Feed & Speed for 3.5mm SIGN drill • Tool Life & Temp • Practical drilling techniques • Ideas for improving SIGN drill

  6. Methods • 2 speeds: 400 & 1100 RPM • 2 feeds: 7 lbs (3 kg) & 17 lbs (8 kg) • Synthetic bone & pig femur • 3.5mm SIGN drill • Commercial general purpose 3.5mm drill • Record time & temperature • Note wear of cutting edge

  7. Results

  8. Results New 400 - 7 1100 - 7 400 - 17 1100 - 17 Bullet

  9. SIGN Key article comparison Bullet

  10. Discussion Highest temperature 96oC recorded for the highest speed lowest force 2900 RPM / 2 Kg

  11. Discussion

  12. Discussion

  13. Discussion RPM = 800 Bullet drill performs better than ortho equivalent drills, producing significantly less temperatures

  14. Higher Temp with Higher RPMs (1100 – 1400) • Lower Temp with Higher Feed Rates

  15. Conclusion Push on the drill (17 lbs / 8 kg): more is better than less Faster RPM (1100) cuts quicker, but only if you push hard (17 lbs, 8 Kg), otherwise temp drill dulls Pulse or Peck every 2 – 3 sec Clears debris Reminder to push

  16. Conclusion Some irrigation is better than none Drill a small (2mm) hole first followed by 3.5mm All drills will eventually become dull, but the can be resharpened, find a craftsman Drills need to be properly used, cared for and maintain to have a long life

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