4TEX® Drill
Machine Gun Bolt Switch: 4TEX® Drill 
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The Challenge

Do you need performance in extreme machining conditions?

Tooling is only a sliver of the pie when it comes to productivity. It doesn’t matter what your tooling is capable of if your machine conditions restrict those capabilities. Our customer, who drills holes for machine gun bolt switches, utilizes a machine with oil coolant that creates more extreme drilling conditions than water-based coolant.

Because oil coolant doesn’t dissipate heat fast enough, the customer’s tooling only lasted for 160 holes per insert, and the tool experienced sporadic failure. They also needed to run a peck cycle for chip control.

The customer decided to test the 4TEX Indexable Carbide Drill using the “P” geometry with AM480 coating designed specifically for wear-resistance in steel material applications. The 4TEX “P” geometry allowed for the speed and feed to be altered and accommodated the machine’s oil coolant. The 4TEX penetration rate was able to decrease cycle time and also double the tool life to 320 holes per insert. The 4TEX geometry also improved chip formation and eliminated the peck cycle.

The 4TEX provided the stable and repeatable process the customer was looking for while increasing tool life by 100%. With all their objectives met, the customer was thrilled with the solution that optimized their machine’s limitations. Are you using the solution that best optimizes your machine’s limitations?

Find an Allied tooling distributor near you.

Product: 4TEX Drill
Objectives: (1) Exceed 160 parts per insert
(2) Eliminate peck cycle
(3) Provide stable/repeatable process
Industry: Firearms
Part: Machine gun bolt switch
Material: 4340 steel
Hole Ø: 0.937" (23.8mm)
Hole Depth: 0.590" (14.99mm)

The Solution
4TEX Indexable Carbide Insert Drill
  • Drill holder, 2xD length:  D2070937I-100F
  • Drill inserts, P geometry (steel):  4T-070305-P
Measure Replaceable Insert Drill 4TEX Drill
RPM 2075 1223
Speed Rate 509 SFM (155.14 M/min) 300 SFM (91.44 M/min)
Feed Rate 0.0015 IPR (0.038 mm/rev) 0.003 IPR (0.076 mm/rev)
Penetration Rate 3.11 IPM (78.99 mm/min) 3.67 IPM (93.22 mm/min)
Peck Cycle Yes No
Cycle Time 16 sec 9 sec
Tool Life 160 holes per insert 320 holes per insert

The Advantages
The 4-sided indexable inserts with wear-resistant coating provided:
  • 100% tool life increase
  • Decreased cycle time
  • Worry-free machining