Milling tool and a tool body

A tool body for a milling tool formed for hobbing of a workpiece having cylindrical cogs, the tool body comprising:

• a peripheral surface and two opposite ends between which a central rotation axis extends, the tool body being rotatable in a predetermined direction of rotation around the central rotation axis;
• a number of spaced-apart insert seats arranged in the peripheral surface, a front end set of said insert seats being arranged along a front end portion of an imaginary helix concentric with the central rotation axis, and a back end set of said insert seats being arranged along an adjacent back end portion of said helix, each insert seat being arranged to receive a replaceable cutting insert such that identical cutting inserts, when mounted, are arranged to engage the workpiece successively along the helix, starting with the cutting insert mounted in a foremost insert seat of the front end set, wherein each insert seat includes stopping means for fixing the respective cutting insert in a radial direction, wherein the back end set of insert seats includes at least three along the helix adjacent insert seats with respective stopping means arranged at an along the helix constant first radial distance from the central rotation axis, and wherein the front end set of insert seats includes at least two along the helix adjacent insert seats with respective stopping means arranged at an along the helix non-constant second radial distance from the central rotation axis, the second radial distance being smaller than the first radial distance and increasing successively along the helix from the foremost insert seat, wherein the second radial distance increases with a distance Δd of 0.02 h≤Δd≤0.1h mm per cutting tooth along the helix, wherein h is the tooth height of a cutting tooth of the back end set, the front end portion extending along less than one complete turn of the helix.