Face gears have a unique advantage in intersected axis transmission, that is, it is insensitivity to the existence of the axis misalignment of pinion. Worms are widely used for continuously generated face gears due to their high efficiency. Existence of the offsets between the machine's translational and rotational axes will affect the gear grinding accuracy. This work analyzes the effects of the machine offsets on the face gear flank deviations. Firstly, the face gear tooth flank is developed considering the dressing and grinding processes on the grinder. Secondly, the offsets of the generator are divided into proprietary and nonproprietary offsets, and the sum of squared errors (SSE) of deviations arising from these offsets is discussed and compared. The nonproprietary offsets have more effect on the gear flank than the proprietary offsets. The offsets in the x-direction have little effect on flank deviation. The offsets in the z-direction have a bigger influence on the flank deviations than those in the y-direction, especially in the dressing process. Flank deviations associated with the nonproprietary offsets and z-direction offsets in the dressing process are distributed in the direction of tooth height. Arising from the offsets during grinding process and the y-direction offsets during dressing process, flank deviations are distributed along the tooth width direction.