Jis B 1702-1 Pdf Guide
Here's an informative review of the standard:
(Profile Deviation): How the actual tooth shape deviates from the perfect involute curve. fβf sub beta
Replaces the 1998 version, focusing on flank tolerance classification. JIS B 1702-1:1998 (Historical):
Understanding JIS B 1702-1: A Guide to Gear Accuracy Standards (PDF & Basics) jis b 1702-1 pdf
): The maximum total variance when summing up all individual pitch errors over a complete 360-degree rotation. It reflects the indexing accuracy of the production machinery. 2. Tooth Profile Deviation ( Fαcap F sub alpha
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): The difference between the actual measured distance of adjacent tooth flanks and the theoretical circular pitch. High fptf sub p t end-sub Here's an informative review of the standard: (Profile
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The standard, officially titled "Cylindrical gears — ISO system of flank tolerance classification — Part 1: Definitions and allowable values of deviations relevant to flanks of gear teeth", is a critical document in the world of mechanical engineering. Published by the Japanese Standards Association (JSA) , it defines a comprehensive tolerance classification system for the tooth flanks of individual cylindrical involute gears.
: The 1998 revision and the current 2016 version were specifically designed to match ISO system of flank tolerance to facilitate international trade. 4. Technical Resources and Compliance It reflects the indexing accuracy of the production
The standard provides allowable values for several critical gear metrics: Single Pitch Deviation (
The old JIS B 1702:1976 standard categorized gear quality into 9 distinct grades, labeled from Grade 0 (highest precision) down to Grade 8 (lowest precision).
(Single Pitch Deviation): The deviation between actual measured pitch and theoretical pitch. Fpcap F sub p
However, as global trade expanded, Japan moved to harmonize its national standards with international ones. Consequently, JIS B 1702:1976 was withdrawn and replaced by a new, multi-part standard based on the international standard . As a result, the 1998 version of JIS B 1702-1 was introduced, and it was a direct adoption (MOD) of ISO 1328-1:1995 .
For spur and helical gears, the standard establishes a series of accuracy grades, from (highest accuracy) to N12 (lowest accuracy). The 'N' prefix (e.g., N7, N8, N9) explicitly denotes that the gear is classified under the 1998 or newer revision of the standard. This helps to prevent confusion with the older grades from the superseded JIS B 1702:1976 standard.