T-A Pro Assembly
T-A Pro Insert
Plunger Assembly: T-A Pro Drill 
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The Challenge

Quiet the Noise.

Sometimes you just need some peace and quiet. Our customer who machines plunger assemblies was previously running a competitor high penetration drill that was extremely loud, causing their machine operators to have to wear hearing protection while running the job, in addition to the Z-axis load on the machine always being over 100%.

Needing to elimate the loud drill noise, the customer tested Allied’s T-A Pro drill. Using the “P” ISO-specific steel insert geometry—designed to provide increased penetration rates and tool life—they were able to increase their speed and feed while decreasing the noise made.

On top of the success of reducing the drill noise, the T-A Pro had an increased tool life and decreased cycle time, which lowered the cost per hole by 55%. The sweet harmony of the T-A Pro in this application just shows why our customer was singing its praises.

If you are looking to quiet the noise, we will help you find the right solution.


Product: T-A Pro drill
Objective: Reduce drill noise
Industry: Oil & gas/Petrochemical
Part: Plunger assembly
Material: 4140 steel
Hole Ø: 1.125" (28.58 mm)
Hole Depth: 5.750" (146.05 mm)
Tolerance: +/- 0.005" (0.13 mm)


The Solution
T-A Pro High Penetration Replaceable Insert Drill
  • Drill holder, 5xD length:  HTA2C05-125F
  • Drill inserts, P geometry (steel):  TAP2-28.58
Measure Competitor Drill T-A Pro Drill
RPM 882 1188
Speed 260 SFM (79.25 M/min) 350 SFM (106.68 M/min)
Feed Rate 0.0060 IPR (0.15 mm/rev) 0.0100 IPR (0.25 mm/rev)
Penetration Rate 5.30 IPM (134.6 mm/min) 11.88 IPM (301.8 mm/min)
Total Part Cycle Time 65 sec 29 sec
Tool Life 203 holes 455 holes
T-A Pro offered 55% cost per hole savings over the competitor tooling.

The Advantages

The AM300 coated T-A Pro insert for use in steel provided:

  • 124% tool life increase
  • Reduced drill noise
  • Decreased cycle time
  • Decreased cost per hole
  • Increased penetration rate