Abstract: A gas rotary screw compressor (1), in particular, for cooling gas suitable for low-power systems, the compressor having a casing (1a) having an intake conduit (6) and a delivery conduit (7); and the casing (1a) having, internally, a three-dimensional region shaped to follow the outer profile of the helical teeth (11b) of a male rotor (11) and the helical teeth (12b) of a female rotor (12), so as to define a first intake chamber (45) to minimize the load losses of the gas stream and so fill the casing (1a) with a maximum quantity of gas.

Abstract: A method of chamfering and deburring the teeth of a gear having first teeth, each of the first teeth having a first and a second side and respective end faces; the method providing for meshing the gear with at least one tool having a ring gear meshing with the first teeth at edges formed between the first and second sides and the end faces; exerting compression between the first teeth of the gear and the ring gear; effecting a first permanent deformation of the edges to form first chamfer faces; and effecting at least a second permanent deformation between the first and second sides and the respective end faces; the first and the second permanent deformation being effected by means of enbloc tools having a first number of teeth and a second number of teeth.

Abstract: In an apparatus for mutually positioning a toothed chamfering/deburring tool and a gear to be worked, the gear rolls along an inclined rack until engagement with a stop disposed therealong in a predetermined position of the gear relative to the tool, which is formed with a first rotary detent member engageable with a second detent member for locating the tool in a predetermined angular position in which teeth of the tool and the gear can mesh when the tool and the gear are moved into engagement, the tool being rotated by a nozzle directing a stream of liquid against at least one tooth of the tool until the engagement of the first and second detent members.

Abstract: A tool for bevelling and deburring gears comprising a deburring tool having profiled teeth which are straight with a taper decreasing from the periphery towards the center and a pair of deburring discs operatively connected to the toothed member.