Indexable　carbide　inserted　blade　cutting　hob　can　provide　increased　productivity　and　quality.　Due　to　the　increased　requirements　for　large-scale　gears　applied　in　mining,　wind　turbine　and　other　fields,　there　has　been　an　intensive　demand　for　the　design　of　indexable　carbide　inserted　blade　cutting　hob.　This　paper　proposes　a　novel　indexable　carbide　inserted　blade　cutting　hob　for　the　planar　double-enveloping　circular　worm　drive.　The　proposed　cutting　hob　consists　of　a　cutter　body　and　6　radically　uniform　distributed　segments　including　cutter　pads,　blades,　end　covers　and　connecting　screws.　Based　on　the　axial　tooth　profile　data,　a　digital　modeling　method　for　the　planar　double-enveloping　worm　hob　is　put　forward.　Then,　the　3D　solid　model　of　the　inserted　blade　indexable　worm　hob　is　established.　The　design　process　for　the　cutting　hob　is　investigated　and　the　machining　simulation　is　further　performed.　Finally,　a　prototype　of　the　cutting　hob　is　manufactured　according　to　the　theoretical　analysis.　©　2017　Taylor　&　Francis　Group,　London.