of the figure the lock 10 has been positioned opposite the cutout 8 by sliding the assembly consisting of the blades and the lock in the peripheral groove 4 the root 5 of the blade 1 is positioned to bear against a lateral wall 11 b of the upper block 11 and covers the segments 12 c and 12 d of the base 12 of the lock 10 the platform 6 of the blade covers the assembly and rests in abutment against the external face of the hub 3 the mounting of a set of blades on a compressor hub comprising a cutout using a device for locking the blades in translation will now be disclosed according to an embodiment of the invention each blade 1 is initially shown in an inclined manner opposite the cutout 8 formed in the open shoulder 7 with the end of its platform 6 which is opposite the cutout positioned to bear against the shoulder 7 u2032 which is not open by maintaining contact of this end on the shoulder 7 u2032 the blade 1 is tilted in the direction indicated by the arrow a of fig3 so as to pass the root 5 between the two faces 9 a and 9 b of the cutout 8 until the other end of the platform 6 comes in turn to bear against the external face of the hub 3 this time in the region of the open shoulder 7 once the root 5 of the blade is introduced and the platform 6 rests on the two shoulders of the external face of the hub 3 the blade 1 is free to circulate in the peripheral groove 4.