Gear Equipment

Gear Hobs - CNC Gear Hobbing Machines - CNC Gear Finishers - Kashifuji Hobbers

Gear Hobbing Machines by Kashifuji

Involute Gear and Machine is the authorized distributor of Kashifuji gear hobbing machines in North America with complete sales, service, and support.

Hard Hobbing - The New Gear Process Alternative to Costly Gear Grinding

Hard hobbing removes the heat distortion in hardened gears by using carbide hobs.

Methods - There are two kinds of Hard Hobbing processes that use carbide hobs. One is "Finish Hobbing" which finish hobs hardened gears after the initial tooth cutting. The other is "Solid Gear Hobbing" which directly hobs hardened solid gear blanks. Kashifuji has developed an Auto Part Orientation Device utilizing a special noncontact sensor that quickly and accurately orientates gear teeth to the hob tool.

Model KT50

6 Axis-CNC Hobbing Machine

Suitable for Hobbing Small Sized Planetary Pinions

A Compact and Complete Dry Cut Hobbing Machine

(Wet Cut Hobbing Machine is optionally available)

Max. Workpiece Diameter : 50 mm

Max. Module : 2

Kashifuji KT50 - CNC Hobbing Machine
  • Features
  • Specification

    Machine Capacity

    Max. Workpiece Diameter
    Max. Module
    Max. Axial Feed Travel
    Max. Hob Head Swivel
    Min.-Max. No. of Teeth
    Max. RPM of Hob Spindle
    Max. RPM of Work Table
    50 mm
    150 mm
    3 ~ 500
    500 ~ 2,000 min-1
    500 min-1

    Working Range

    Center Distance from Hob to Work Table
    Distance from Table Top to Tailstock Center
    35 ~ 120 mm
    250 ~ 500 mm


    Total Power
    Main Motor, AC Spindle Motor
    18 kVA
    5.5 kW

    Floor Space and Weight

    Floor Space: Length x Width x Height
    2,510 X 1,360 X 2,200 mm
    4,000 kg
  • Dimensions

    Front View

    Side View

    Top View

  • Vertical Hob Machine

    Vertical Hob Machine

    Changing Fixtures, Hob Cutters or Workpieces (manual loading) is far simpler and faster than in a horizontal hobber as compared to a vertical hobber. As the workpiece /fixture are positioned vertically, they are very easy to exchange and accurately mount. The Hob Head of a vertical hobber allows great accessibility to the work table/tooling area and peripheral equipment (auto loader, transfer unit etc.) can be added without reducing operability!

  • Zero Backlash Table

  • Hand Scraped Guideways

    Hand Scraped Guideways

    Kashifuji hand scrapes the guideways on all its hobbing machines to create a platform that dampens and absorbs the intermittent cutting forces that are inherent to hobbing process. This feature allows many years of use while still maintaining superb hobbing accuracies.

    Generally, machining has limited achievable accuracies due to friction created distortions and/or internal stress relief produced during the machining process. Variations of temperature and humidity during the machine process can also reduce accuracy. Kashifuji utilizes a hand scraped surface finish to assure highly accurate guideways that are not possible by any machining/grinding process.

    Hand Scraping is a finish processing method that makes the guideways extremely accurate with an ideal flatness and straightness by manually removing metal in extremely small amount (1~3 micro meters) by the use of a hand tool called a "Scraper". This hand tool has a carbide tipped single edge blade with a blunt angle. This tool is used to relieve the surface tension (create numerous, evenly distributed small, shallow dips or reliefs) in the guideway surfaces. Scraping produces a very flat surface, and the "shallow divots" retain oil which creates smooth sliding surfaces while reducing wear.

    Hand scraping is a labor intensive process. The guideway surfaces are painted with a dye then rubbed with a reference straight edge, the dye collects on the highspots. The highspots are then removed by hand scrapping. This process (applying dye, rubbing & scrapping) is continually repeated until approximately 30% of the guideway surface is relieved producing ~70% bearing surface. This process produces an extreme flatness.

    Hand scraping is referred to as a "Master's Skill". Kashifuji's skilled craftsmen are able to make accurate micro-meter scraping marks compensating for variations caused by material or temperatures changes. The "scraping pattern" produced, is often referred to as an "art form", and is unique to each craftsman. It takes many years of tedious, difficult work to acquire the experience & skill to become an accomplished Kashifuji "Scraper"

  • Hard Hobbing

  • Program- ming


    Programs are created by only inputting part gear data, hob data and cutting conditions. After the completion of the programs, hobbing will be automatically performed by selecting the part number.

    Optional crowning, relieving and/or taper hobbing cycles are easily performed. Simple and easy-to-operate hobbing programs are available for a wide variety of production situations, from mass production to special prototype hobbing.

  • Auto- mation


    Numerous styles and types of auto loaders, conveyors or part stockers are available for automatic part transfer. All loader design are labor saving and increase efficiency.

    Basic 2-Arm Auto Loader(KN80, KN152) Basic Ring Loader (KA200E, KE201/251, KA220/400)
    Examples of Automation Transfer Example for Flat Gears
    Examples of Automation Transfer Example for Flat Gears
    Transfer Example for Shaft Gears Transfer Example for Shaft Gears

Typical Parts Hobbed on the KT50

Planetary Pinion and Sun Gear for Automotive Automatic Transmission

Production/Hobbing Video

Compact Size

The KT50 has similar hobbing capability as the KN80. However, it has a 40% smaller foot print, volume reduction of 50% and weight reduction of 30% as compared to the KN80.

Stable Hobbing Package

The integrated bed column and tailstock column combined with a closed-loop designed over-arm create a highly rigid machine, despite its compact size. This design allows excellent O.B.D. consistency.

Integrated Bed Column

Closed-Loop Designed Over-Arm
(Bed Column and Tailstock Column)

High Speed Work Table Rotation

The Work Table is driven by cylindrical gears allowing 500 rpm Table speed. The Work Table Master Gear diameter is more than 6 times larger than the max. part diameter. This ratio creates a highly accurate hobbing process. Additionally, the Work Table is designed to allow great accessibility to the hob head.

High Speed Auto Loader

The special High Speed Loader reduces cycle time. The NC controlled 2 arm loader smoothly indexes in less than 0.3 seconds.

2 Station Auto Loader

3 Station Auto Loader

Model KA220-KA400

6 Axis-CNC Hobbing Machine

Designed for Heavy Duty Hobbing of Medium Sized Gears

An Extremely Rigid Hobbing Machine

– Max. Workpiece Diameter : 250/400 mm
– Max. Module : 8

Model KA1200

6 Axis-CNC Hobbing Machine

Ideally Suited for Large Sized Gears

A Substantial, Accurate and Extremely Rigid Hobbing Machine

– Max. Workpiece Diameter : 1200 mm
– Max. Module : 20

Model KL451

4 Axis-CNC Hobbing Machine

An Extremely Versatile Hobber Covering a Wide Range of Parts

Ideal for Hobbing of Small and Medium Sized Gears

– Max. Workpiece Diameter : 450 mm

– Max. Module : 5

Model KE201-251

6 Axis-CNC Hobbing Machine

Increased Rigidity with a Compact Design

A Complete Dry Cut Hobbing Machine

(Wet Cut Hobbing Machine or Wet/Dry Cut Hobbing Machine is optionally available)

– Max. Workpiece Diameter : 200/250 mm
– Max. Module : 6

Model KN152

6 Axis-CNC Hobbing Machine

Ideally Suited for Hobbing Long Shaft Parts

A Complete Dry Cut Hobbing Machine

(Wet Cut Hobbing Machine or Wet/Dry Cut Hobbing Machine is optionally available)

– Max. Workpiece Diameter : 150 mm
– Max. Module : 4

Model KN80

6 Axis-CNC Hobbing Machine

Ideal for Hobbing Small Gears

An Energy-Saving and Complete Dry Cut Hobbing Machine

(Wet Cut Hobbing machine or Wet/Dry Cut Hobbing Machine is optionally available.)

– Max. Workpiece Diameter : 80 mm
– Max. Module : 4

Model KD1

Gear Duburring Machine

High Speed Gear Chamfering/Deburring

A Deburring Machine with Years of Proven Acceptability

Model KG253

4 or 6 Axis-CNC Hob Sharpening Machine

A Precision Hob Sharpener

Model KL1000

6 Axis-CNC Hobbing Machine

A Versatile Hobbing Machine Suited for Large Sized Gears

– Max. Workpiece Diameter : 1000 mm
– Max. Module : 12

Model KPS20 Pinion Skiving Machine


Equipped with a Rotary Chamfering Device



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