Tungaloy has expanded its DrillMeister exchangeable-head drill system, adding 24 DMH drill heads that are designed to resist fracture damage. This addition is for hole diameters ranging from 6.0 to 9.9 mm (0.236″ to 0.390″) and from 20.0 to 25.9 mm (0.787″ to 1.020″).
The drill heads are optimized for cutting solid carbide drills and designed for ease of use. A single drill body can hold five different styles of drill heads, which are available in general purpose DMP style, DMC for high-precision holes, DMF with flat edges well suited to counterboring, DMN for nonferrous applications and DMH with enhanced drill corner geometry for drilling thin plates.
The DMH drill head geometry is designed to protect drill corners and provide effective chip evacuation, making the drill head suited for applications that involve drilling holes through thin plates. The increased cutting edge strength is said to resist thin-plate snapback and wear from exit burrs. The strong cutting edge also makes the DMH drill head suitable for drilling extremely hard metals.
Tungaloy says AH9130 grade provides DMH drill heads with a good balance of wear and fracture resistance, designed to improve tool life performance and wear predictability, particularly in carbon steel and alloy steel.
