DuAl EX Hob● Suitable for both dry and wet hobbing● Supports a wide range of machining

environments and methods● Exhibits the best performance in conventional

cutting range (Cutting speed 60 to 160m/min)

● Specifications for re-grinding (no coating on cutting face)

Select coating according to application

Wet hobbing

Hyper DuAl SP

Hyper DuAl GP

DuAl EX

50 100 200 300

Hyper DuAl SP(For re-coating)

Hyper DuAl GP(For re-coating)DuAl EX

(For re-grinding)

（m

m/re

v）➡

Dry hobbing

Standard efficiency High efficiency Hyper efficiency

For re-grinding/re-coating

For re-grinding

Feed

Hyper efficiency

High efficiencyStandard

efficiency

Cutting Speed (m/min)

Comparison of wear without coating on cutting face

Test conditions• Workpiece specifications: m1.7 × PA18°× NT49, SCr420H • Hob specifications: O.D. 70mm × NT16 × 4TH No coating on cutting face

• Cutting conditions: V=150m/min, f=1.8mm/rev, climb cutting, dry condition, 2,000 operations 　

0.14

0.12

0.1

0.08

0.06

0.04

0.02

0

DuAl EX Competitor Coated hob for dry cutting Hyper DuAl GP

Wea

r (m

m)

VB wear on top tooth

VB wear on bottom tooth

No coating on cutting face With coating on cutting face (re-ground and re-coated)

Same tool life as other brand re-coated hob

· DuAl EX Hob without coating on cutting face after re-grinding has same tool life as other brand Hob after re-grinding and re-coating.· This eliminates re-coating fees and reduces inventory, providing a significant advantage in tooling costs