down reaching chip surfaces 10 which protect the deburring pistons 4 against beard chips and scale in order to influence the deburring force requirements in a positive way by a wedge shaped cutting blade 8 this wedge includes a working angle u03c3 composed of chip angle u03b1 and wedge angle u03b2 which should be as small as possible and a smallest clearance angle u03b3 which should help to prevent significant friction against the deburring tool fig3 a shows the conventional wear and break resistant angle relations on a deburring cap 6 wherein u03b1 u2266 90 u00b0 u03b2 90 u00b0 and a clearance angle u03b3 u2267 0 u00b0 results in a working angle of u03c3 u2266 90 u00b0 fig3 b shows the angle relations on a chisel 7 here the angles amount to u03b1 as chip angle 91 u00b0 to 145 u00b0 u03b2 as wedge angle 30 u00b0 to 89 u00b0 and u03b3 as clearance angle 0 u00b0 5 u00b0 and result in a working angle u03c3 of 30 u00b0 to 89 u00b0 preferably 40 u00b0 to 55 u00b0 according to the hardness of the cutting beard 1 as corresponding tests have shown those tests also revealed that there exist favorable force relations when the cutting blade 8 does not hook in the surface of the slab 2 favorable short chisels 7 do only have those working angles u03c3 near the slab 2 in the following they are guided to the deburring body 3 as a protecting chip surface 10 with a chip angle u03b1 increased to 90 u00b0 fig4 a and 4b show a chisel 7 which is especially suitable for very long and hard cutting beards 1 as they arise i e on the occasion of horizontal torch cutting of vertically case strands with.