分度圆柱面的英文

• reference cylinder

• 分度:    scale division; scale mark; ...
• 分度圆柱导程角:    lead angle at reference cylinder
• 分度圆柱螺旋角:    helix angle at reference cylinder
• 分度圆:    divided circle; pitch line; reference circle; standard (cutting) pitch circle; reference circle; standard pitch circle; standard pitch circle
• 分度圆半径:    reference radius