was that the outlets 40 would clog with debris which could overheat or simply just stall the mill in a tangle of cuttings another issue with the former design was that the blades 42 come short of the center 104 leaving just an array of ground carbide particles in that region when milling out a packer for example the effect was uneven milling mills that simply used a central bore to accept reverse circulation flow when milling suffered from having no milling going on near their centers so as to leave a core of un milled tool as the cutting progressed the mill of the present invention in fig8 has a main bore 106 preferably centrally located with a bend 108 so that the entrance for cuttings 110 is near the circumference 112 a network of passages 114 directs the cuttings from the action of the carbide particle arrays 116 to the entrance 110 the passages 114 also direct reverse circulating fluid coming down outside the tool into the entrance 110 there are two main advantages of this design one is that the entrance 110 is close to or even larger than the bore 106 to reduce if not eliminate the problem of balling up of cuttings.