G-Series High Speed Hard Cutting Hobs
Finishing hardened gears doesn’t always require expensive grinding machines. The Nobeve G-Series is engineered to cut steels up to 62 HRC, delivering DIN AAA quality directly after heat treatment. By combining high-toughness carbide with negative rake geometry, we turn your hobbing machine into a finishing powerhouse.
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INTRODUCTION
Is Gear Grinding Slowing Down Your Production?
For decades, the only way to finish hardened gears was grinding—a process known for high capital costs, slow cycle times, and risk of grinding burns.
But modern metallurgy has changed the game. If you are producing automotive transmission gears or hydraulic pump gears, G-Series Hard Hobbing offers a faster, more economical alternative.
Ultra-Stable Substrate
Anchored by Konrad Friedrichs sub-micron carbide, this material delivers exceptional Transverse Rupture Strength (TRS), resisting micro-chipping even when machining hardened steels (up to HRC 62) under high load.
Compressive Geometry
Features a specific negative rake angle (-10° to -15°) and reinforced K-Land. This design redirects cutting forces into the chip mass, protecting the cutting edge from crumbling during hard skiving.
G-SERIES SPOTLIGHT
Thermal Shield
Coated with Oerlikon Balzers BALINIT® ALTENSA for extreme hot hardness. It enables aggressive speeds (Vc up to 220 m/min) by acting as a barrier that forces heat into the chips, not the tool.
Superior Cost-Per-Part
The G-Series features a thermal barrier optimized for HRC 45-62 materials to maximize durability. Fewer tool changes and longer production runs directly lower your consumable cost per part.
PRODUCT SPECIFICATION
Our G-Series is purpose-built to withstand the extreme mechanics of cutting post-heat-treat materials (up to HRC 62). It transforms your rigid hobbing machines into finishing centers, ensuring stability and precision where standard tools would fail
| Specifications-Overall Dimensions | Surface Treatment | ||
|---|---|---|---|
| External Diameter | Internal Diamete | Length | |
| Unit(mm) | Unit(mm) | Unit(mm) | |
| ≤φ25 | φ8 | ≤L30 | Cleaning-Sandblasting Edge Passivation PVD Coating |
| ≤φ25 | φ10、φ13 | ≤L50 | |
| ≤φ40 | φ13 | ≤L60 | |
| ≤φ40 | φ16 | ≤L80 | |
| ≤φ70 | φ22、φ27 | ≤L100 | |
| ≤φ95 | φ27、φ32、φ40 | ≤L100 | |
- Recommended Cutting Speed: 120–220 m/min
- Recommended Feed Rate: 0.15–0.35 mm/rev
- Machining Environment: Suitable for wet (oil-cooled) cutting.
- Workpiece Hardness:HRC 45-62 (Note: A secondary finishing cut is recommended for the HRC 56 – 62 range.)
- Accuracy Class: DIN AA, DIN AAA
- Customization: Custom sizes available for batch orders.
Not the right fit for your current application? Explore other gear cutting tools from Nobeve.
WHY CHOOES OUR G-SERIES HOBS
Reduced Inventory Overhead
The extended tool life in HRC 62 steel significantly lowers tool change frequency. This reduces your need for large safety stocks, freeing up working capital and simplifying your monthly procurement cycles.
Superior Surface Integrity
Optimized micro-geometry minimizes cutting vibration and transmission error. This delivers exceptional surface finish and reduced noise levels, ensuring compliance with strict standards
Safe Unattended Operation
High structural stability prevents unexpected edge failure during hard skiving. This reliability allows you to run automated safely, maximizing daily throughput.
Testimonials
Our Customers
Feedback
"As a mid-sized shop, we don't have a grinding machine. The G-Series lets us finish hardened prototype gears (HRC 60) on our existing hobber. It solves a huge investment problem for us."
"We use these for pump gears. The main advantage is the toughness—the cutting edge doesn't chip easily on 20CrMnTi materials. Delivery and technical support were also very responsive."
"We produce motorcycle transmission gears in high volume. Switching to the G-Series allowed us to replace expensive Japanese tools while maintaining the same noise standards."
FREQUENTLY ASKED QUESTIONS
AThe G-Series is engineered to process steels up to HRC 62 (e.g., case-hardened 20CrMnTi or 8620H) . Unlike standard carbide hobs that wear rapidly above HRC 48, the G-Series utilizes a specific Fine-Grain High-Toughness Substrate combined with a zero rake geometry or negative rake geometry to withstand high compressive loads without catastrophic breakage.
A
For gears requiring DIN 6 to DIN 7 quality and surface roughness of Ra ≥ 0.4µm, the answer is YES. Hard hobbing with the G-Series removes heat-treatment distortion significantly faster than grinding—reducing cycle time by 50-70%. However, for extreme precision (DIN 4-5) or profiles requiring Ra < 0.3µm, grinding remains the standard.
A
We strictly recommend Oil Cooling (Wet Cutting) for the G-Series. While our K-Series is for dry cutting, the G-Series utilizes a zero rake angle or negative rake angle to “push” hard material. High-quality cutting oil is essential here to:
Lubricate the cutting edge to reduce friction heat.
Flush away the abrasive hard chips immediately to prevent re-cutting.
Achieve a superior “grinding-like” surface finish (Ra) that dry cutting cannot easily match on hard steel.
A
Chipping usually occurs because standard hobs have a positive rake angle (sharp but brittle). The G-Series features a Zero Rake Angle or Negative Rake Angle (0° to -15°) and a reinforced K-Land (Edge Honing). Instead of “shearing” the metal aggressively, this geometry directs the cutting force into the solid body of the tool, massively improving edge stability during interrupted cuts.
A
Hard hobbing generates cutting forces 2.5x higher than soft hobbing. You cannot run G-Series on older manual machines with backlash. We recommend rigid CNC Hobbing Machines (Direct Drive spindles preferred) with a rigid tailstock. The use of oil cooling also requires the machine to have an adequate filtration system to keep the cutting fluid clean from fine hard chips.
A
We use Oerlikon Balzers BALINIT® ALTENSA (or equivalent AlCrN-based coatings) . Even with oil cooling, the temperature at the cutting tip is extreme. This coating offers high hot hardness and excellent oxidation resistance, ensuring the substrate remains protected even under the heavy load of hard machining.
ATo save you shipping time and customs costs, we do not recommend sending hobs back to us. Instead, Nobeve provides a full “Refurbishment Technical Data Package” with every G-Series order. This includes the exact DXF profile, Edge Preparation (Honing) parameters, and Coating specs. You can simply provide this data to your local tool service center (e.g., a local Balzers or coating center) to restore the hob to Nobeve factory standards.
A
For external gears, Hard Hobbing with the G-Series is significantly more cost-effective. A solid carbide hob costs a fraction of a complex Skiving cutter and is easier to maintain. Power Skiving is superior for internal gears. But for standard external shafts/gears, G-Series Hard Hobbing offers the lowest Cost Per Part (CPP) and leverages your existing hobbing machines without needing expensive Skiving options.
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