Published by the Japanese Standards Association (JSA) and directly harmonized with the international ISO 1328-1 framework, this standard establishes a unified technical language for gear geometry deviations. It provides the mandatory calculations required by mechanical engineers and gear manufacturers globally to specify pitch, profile, and helix tolerances. 1. Evolution and Technical Scope
: New standard grades are often prefixed with an "N" (e.g., Grade N5) to distinguish them from the old 0-8 scale.
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): The maximum total variance between any two flanks over the full 360∘360 raised to the composed with power rotation of the gear wheel. Profile Deviations jis b 1702-1 pdf
These grades allow designers to specify the required precision based on the application. For instance, high-precision applications like robotics or medical machinery might require grades 0-4, while general-purpose machinery might use grades 7-9. 2. Deviations Covered
Engineers use JIS B 1702-1 to specify the required precision for gears based on their end-use. For example: High-speed turbines typically require Class 4 or 5. General industrial machinery often utilizes Class 8 or 9. Automotive transmissions
If you cannot purchase the standard, the most to read is any comparative analysis between ISO 6336 and JIS B 1702-1 . Published by the Japanese Standards Association (JSA) and
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Engineers reviewing technical blueprints often encounter a mix of old and new notations. Understanding how the standard evolved is vital when cross-referencing values inside a downloaded PDF document: Former Standard (JIS B 1702:1976) Modern Standard (JIS B 1702-1:1998 / 2016) Numeric alone (e.g., Grade 0, Grade 4) Prefixed with "N" or "IT" (e.g., Grade N5, Grade N7) Number of Grades 9 grades (0 to 8) 13 grades (0 to 12) Accuracy Scale 0 is the highest precision; 8 is the lowest 0 is the highest precision; 12 is the lowest ISO Alignment Independent Japanese metrics Fully harmonized with ISO 1328-1
Understanding JIS B 1702-1: The Standard for Gear Accuracy The standard is the primary Japanese Industrial Standard for classifying the accuracy of cylindrical involute gears. Established by the Japanese Standards Association (JSA), it provides the technical definitions and allowable deviation values for tooth flanks, ensuring precision in mechanical systems ranging from heavy industrial machinery to high-precision robotics. Overview of JIS B 1702-1:2016 Evolution and Technical Scope : New standard grades
One of the most useful "papers" you will find is actually the technical manual for the gear rating software.
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To properly utilize a JIS B 1702-1 PDF or reference manual, you must understand the primary elemental deviations it regulates. Quality control departments use specialized Gear Measuring Machines (GMMs) to extract these specific metrics. 1. Pitch Deviations (Fp, fpt) Single Pitch Deviation ( fptf sub p t end-sub