DESCRIPTION OF GEAR INSPECTION SHEET PARAMETERS
Chart explanation
![](/-/media/www-nidec-com/machine-tool/knowledge/column/cutting-tool/gearchart/gearchart_1.jpg)
![](/-/media/www-nidec-com/machine-tool/knowledge/column/cutting-tool/gearchart/en_gearchart_2.png)
Profile
Profile | ISO・DIN | JIS |
---|---|---|
Profile angle deviation | fHα | FA |
Profile form deviation | ffα | FFA |
Total profile deviation | Fa | FF |
![](/-/media/www-nidec-com/machine-tool/knowledge/column/cutting-tool/gearchart/en_gearchart_3.jpg)
Lead
Lead | ISO・DIN | JIS |
---|---|---|
Lead angle deviation | fHβ | FH |
Lead form deviation | fβf | FQA |
Total Lead deviation | fβ | FQ |
![](/-/media/www-nidec-com/machine-tool/knowledge/column/cutting-tool/gearchart/en_gearchart_4.png)
JIS 1702-1 1998 ISO 1328-1 1995 DIN 3961 1978