By　using　electronic　generative　metrology,　an　hourglass　hob　measuring　machine　is　developed　based　on　the　measuring　principle　of　cylindrical-coordinate　system.　In　the　control　of　three　moving　axes,　the　machine　allows　a　probe　to　move　along　the　measuring　path　controlled　by　a　closed　loop　system　to　obtain　the　data　and　implement　the　measurement.　The　working　principle　and　constitution　of　the　machine　are　introduced.　The　machine　is　based　on　a　horizontal　structure　and　consists　of　a　granite　base,　a　precision　spindle,　sliding　guides　and　a　closed-loop　control　system.　An　hourglass　hob　measuring　software　is　developed　to　measure　each　deviation　of　the　hourglass　hob　precisely.　The　practical　measurement　results　indicate　that　the　machine　can　inspect　the　cutting　edge　helix　deviation,　cutting　edge　tooth　profile　deviation　and　the　circular　pitch　deviation,　and　the　measurement　uncertainties　are　2.35　μm,　2.45　μm　and　2.94　μm,　less　than　one　third　of　the　tolerances　of　the　deviations　in　GB/T6084-2001,　respectively.　It　satisfies　the　requirement　of　hourglass　hobs　with　accuracy　class　AA　for　high　precision　measuring　of　each　deviation　and　verifies　the　function　and　stabilization　of　the　measuring　machine.　The　machine　can　measure　the　hourglass　worm,　cylindrical　worm　and　the　cylindrical　hob　as　well.　©　2015,　SCIENCE　PRESS.　All　right　reserved.