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KITAI

KITAI develops and manufactures small hobbing machines and gear processing related equipment.

KITAI hero image

Machine Lineup

KITAI's Brand-New Machines

Specification Comparison Table

Max. Module

mn (DP)

2.0 (12)

0.75 (34)

0.75 (34)

2.5 (10)

2.5 (10)

2.5 (10)

2.5 (10)

1.0 (25)

Max. Diameter of gear

mm (inch)

160 (6.299)

30 (1.181)

30 (1.181)

100 (3.937)

100 (3.937)

100 (3.937)

100 (3.937)

60 (2.362)

Number of teeth

Z

3-999

3-999

6-100

3-999

3-999

5-100

3-999

-

Swivel angle of hob head

°

+160 ~ -20

±45

-

±45

+117 ~ -45

±45

+108° ~ -45°

-

Max. hob spindle speeds

rpm

3,000

6,000

4,000

4,000

4,000

1,500

1,500

-

Floor space

mm (inch)

1,215x1,460 (47.83x57.48)

1,379x1,376 (54.29x54.17)

1,070x930 (42.13x36.61)

1,680x1,750 (66.14x68.90)

1,680x1,750 (66.14x68.90)

1,545x1,275 (60.83x50.20)

1,755x1,350 (69.09x53.15)

1,000x1,370 (39.37x53.94)

Net Weight

kg (lb)

1,400 (3,086)

1,400 (3,086)

900 (1,984)

3,600 (7,936)

3,600 (7,936)

2,100 (4,630)

2,100 (4,640)

2,000n(4,409)

Cuttable Gears

Spur Gear

Helical Gear

Worm Wheel

Worm

Internal Gear

Stepped Gear

Technology

High Rigidity for Superior Precision and Long Service Life

KITAI hobbing machines are renowned for their high precision and rigidity. This is achieved through a combination of innovative technologies, including "Kisage" (hand scraping) for achieving high-precision metal contact on sliding surfaces, and a dual-axis drive method for enhanced rigidity.

Point 1

Traditional NC Synchronization vs. KITAI Dual-Axis Drive

Traditional NC Synchronization vs. KITAI Dual-Axis Drive hero Image

Conventional NC systems rely on separate motors for the hob spindle, main spindle (work spindle), and tailstock spindle. While NC control attempts to synchronize them, variations in workpiece material (hard vs. soft areas) can cause load fluctuations, leading to potential synchronization issues. To compensate, NC machines often use oversized motors (4-5 times the needed power) to handle these fluctuations, adding cost and complexity.

KITAI's innovative dual-axis drive method takes a different approach. A single powerful motor drives both the main and tailstock spindles through a precisely engineered gear train. This design ensures perfect synchronization, even under varying loads. By distributing the load evenly across both axes, the risk of synchronization loss is eliminated. This translates to several benefits:

  • Prevents center hole damage Consistent synchronization protects the workpiece's center hole from potential damage.
  • Ensures stable chucking Precise synchronization guarantees stable workpiece clamping, crucial for high machining accuracy.
  • Maintains high precision The even load distribution minimizes vibrations, allowing for precise hobbing operations.

This unique dual-axis drive system exemplifies KITAI's commitment to achieving superior machining accuracy and performance.

Point 2

Kisage: The Art of Hand Scraping Sliding Surfaces

Kisage: The Art of Hand Scraping Sliding Surfaces hero Image

Kisage, or hand scraping, is a traditional Japanese technique used to create a precise and uniform finish on the sliding surfaces of machine tools. This meticulous process involves the careful removal of material using specialized tools, resulting in a number of significant benefits:

  • Extremely High Mechanical Rigidity The high rigidity makes the machine more durable and extends its lifespan. Additionally, this allows for better performance in high-speed feed cutting, skiving, dry cutting, and machining of hard materials compared to point-contact linear guide methods.
  • Efficient Lubrication of Sliding Surfaces Scraped finishes by skilled craftsmen with years of experience improve the efficiency of lubricant supply to the sliding surfaces.
  • High Precision Cutting The increased contact area due to scraping allows for the absorption of fine vibrations at the hob's cutting edge during cutting, enabling high precision cutting.

Sample of Gears Cut by Hobbing Machines

Image of Automobile parts

Automobile parts

Speedometer

Meter

Power window

Power seat

etc.

Image of Motorcycle parts

Motorcycle parts

Chain-wheel

Speedometer

Starter-serration

etc.

Image of Camera

Camera

Autofocus (AF) mechanism

Aperture mechanism

Shutter

etc.

Image of Fishing reels

Fishing reels

Handle rotation mechanism

Spool rotation mechanism

Drag mechanism

etc.

Image of Pencil sharpener

Pencil sharpener

Edged tool

Gears for rotating parts

etc.

Others

Small motor

Small transmission / Reduction device

Industrial robot

Office-automatic equipment

Power tools

Computer-related parts

Timing pulleys

Sewing machine parts

Vending machines

etc.

Company

Company Overview

Name

KITAI SANGYO CO., LTD.

Founded

March, 1936

CEO

Masayuki Kitai

Capital

¥35,000,000

Business Description

Manufacture and sales of small gear hobbing machines and related gear products.

Location

860-1, Hoshikawabata, Shimoosaki, Shiraoka-city, Saitama, 349-0203, Japan

Official Website

https://kitaisangyo.jp/

History

Mar, 1936

Kitai Gear Factory was founded.

Jun, 1953

Developed HOBLON 1-A.

Mar, 1956

Renamed to Kitai Sangyo Co., Ltd.

Oct, 1962

Exhibited at the first Japan International Machine Tool Fair (JIMTOF).

Mar, 1965

Exhibited at JETRO Machine Tool Fair held in Hong Kong.

Aug, 1968

Developed HOBLON 8-F.

Feb, 1972

Developed HOBLON 8-FH.

May, 1978

Developed Hi-PRO 3A.

Jan, 1980

Exhibited at Machine Asia held in Singapore.

Mar, 1981

Exhibited at WESTEC held in LA, USA

Mar, 1983

Developed Hi-PRO 10A

Dec, 1991

Developed Hi-PRO 5A

Aug. 1996

Developed HOBLON 8-FN

Sep, 1996

Developed Hi-PRO 3U

Apr, 1997

Developed Hi-PRO 10AII

May, 1998

Relocated the factory to Shiraoka, Saitama

Jun, 1999

Developed KGT, a double-flank gear rolling tester.

Oct, 2000

Developed SKA, an automatic hob sharpening machine.

Oct, 2003

Developed Hi-PRO 10AIII.

Apr, 2003

Developed KN-1, a gear cutting machine.

Aug, 2004

Developed SK-A200, an ultrasonic wave grainding machine.

Nov, 2004

Developed Hi-PRO 2A.

Nov, 2006

Developed KS-6N, a gear shaping machine.

Jan, 2007

Developed SKA-H, an automatic hob sharpener.

Aug, 2008

Developed Hi-PRO 10N.

Oct, 2012

Developed HOBLON 8-NC.

Aug, 2014

Developed Hi-PRO 3N