Abstract: The instrument to be ground is positioned lying on the brackets of a support, with its longitudinal axis horizontal and parallel to the plane of a base plate of the apparatus. A grinding stone, mounted on a carrier arranged in such manner as to be able to slide on the base plate is moved opposite the end of the blade of the instrument while rubbing lightly against the cutting face of this blade, thus acting to grind that face. The inclination of the grinding stone is adjustable according to the configuration of the instrument, a dial clinometer enabling this inclination to be checked and to determine it as a function of indications which will be furnished, to this end, by the manufacturer of the instrument.