One of the most important facts about this standard is its international compatibility.
However, do not waste months searching for a "free" version that is likely broken or illegal. Consider the PDF purchase an insurance policy against manufacturing defects.
Inside the standard's tables, formulas use these variables to calculate the maximum allowable error in micrometers (
Page 1. JIS. JAPANESE. INDUSTRIAL. STANDARD. Translated and Published by. Japanese Standards Association. JIS B 1702-1. (JGMA/JSA) 日本規格協会 JSA GROUP Webdesk jis b 1702-1 pdf
: The standard includes informative annexes for advanced analysis, such as: Zone-based tolerance evaluation (Annex A).
The standard covers the following aspects:
| Deviation | Symbol | Description | Impact | | :--- | :--- | :--- | :--- | | | ( f_pt ) | The difference between the actual measured pitch value between any adjacent tooth surfaces and the theoretical circular pitch | Contributes to high-frequency vibration and noise. | | Total Cumulative Pitch Deviation | ( F_p ) | The difference between the theoretical summation over any number of teeth and the summation of actual pitch measurements over the same interval | Affects rotational accuracy and positioning precision. | | Total Profile Deviation | ( F_\alpha ) | The distance that the actual tooth profile chart lies between the upper and lower design charts | Impacts smoothness of motion and load distribution. | | Total Helix Deviation | ( F_\beta ) | The distance that the actual helix chart lies between the upper and lower helix charts | Causes concentrated contact, noise, and reduced load capacity. | | Runout (Fr) | ( F_r ) | The total variation in the position of a probe placed in each tooth space as the gear is rotated | Primary source of periodic noise and vibration. | One of the most important facts about this
Released under the authority of the Japanese Standards Association (JSA), this standard specifies:
Accuracy along the width of the gear tooth. 3. The Tolerance Classification System
When sourcing a PDF copy of JIS B 1702-1 for your engineering library, keep the following compliance rules in mind: Inside the standard's tables, formulas use these variables
Explain the .
: Focuses on single-flank tolerance classifications, definitions, and allowable deviation values.
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
: Lower numbers (e.g., Grade 0 or 1) indicate extremely high precision, used in aerospace or master gears.