Cylinders: BT-A 
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The Challenge

The customer machines cylinders made from 1045 steel using a Technidrill BTA machine operating at 900 PSI (62 bar) with semi-synthetic coolant.

The Ingersoll tools had difficulty drilling a straight hole, and the customer produced few parts that had the drill actually come out the side of the cylinder.

The BT-A Drill delivered a much straighter hole with less than 0.010” (0.254 mm) variance in cylinder wall thickness.

Product: BT-A
Objectives: Improve process
Industry: General machining
Part: Cylinders
Material: 1045 steel
Hole Ø: 1.375" (34.925mm)
Hole Depth: 17.7" blind hole (449.58mm)

The Solution
The BT-A Drill
  • BT-A Drill head: 1.375" 807 series
  • GEN2 T-A insert: 4C12H-0112-HE
Measure Competitor BT-A
RPM 800 750
Feed Rate 0.0074 IPR (0.190 mm/rev) 0.0118 IPR (0.299 mm/rev)
Penetration Rate 5.9 IPM (149.86 mm/min) 8.85 IPM (224.79 mm/min)
Cycle Time 2 min 43 sec 1 min 59 sec
Tool Life 750 linear inches (19.05M) 900 linear inches (22.86M)
BT-A offered 15% cost per hole savings compared to competitor tooling.

The Advantages
The BT-A Drill provided:
  • 20% tool life increase
  • Decreased cycle time
  • Decreased cost per hole