In　order　to　produce　a　special　machine　tool　for　manufacturing　high-quality　globoidal　cams,　this　paper　presents　a　systematic　approach　for　tolerance　analysis　and　tolerance　allocation　for　the　special　machine　tool.　Based　on　the　differential　geometry　and　conjugate　theory,　the　machined　surface　and　the　surface　deviation　of　a　globoidal　cam　are　derived　with　the　help　of　a　VS　software.　The　sensitivity　model　and　the　worst-case　method　are　applied　to　analyze　the　effects　of　machine　tool　errors　on　the　machined　surface　deviation.　Manufacture　easiness　index　which　can　evaluate　the　level　of　manufacture　difficulty　and　can　also　indirectly　imply　manufacture　cost　is　proposed.　Then,　the　optimization　problems　are　formulated　to　the　maximize　manufacture　easiness　index　subject　to　quality　target　of　cam　surface　and　manufacture　constraints.　The　optimization　results　are　obtained　by　using　MATLAB　implementation　of　linear　programming.　To　confirm　the　optimization　results,　they　are　applied　as　a　guideline　to　design　and　manufacture　this　special　machine　tool.　After　that,　a　globoidal　cam　is　manufactured　on　this　machine　tool　and　measured　on　a　coordinate　measuring　machine　(CMM).　The　measuring　results　demonstrate　the　effectiveness　of　the　proposed　approach.