INSTRUMENT TO MEASURE ANGLES OF SAW BLADES Russian patent published in 2014 - IPC B27G23/00 

FIELD: process engineering.

SUBSTANCE: invention relates to woodworking and can be used for measurement of saw blade angles. Proposed instrument comprises base, twp turn sectors and cover. Said base has three scales to measure the rear, front, negative and cutting angles. First sector adjoining the base has sharpening angle scale, turn handles, rectilinear edge to read out the rear angle. Rectilinear edge extends to the other end from sector turn centre into contact jaw to be pressed to measured tooth rear side face. First sector has cut-out to view negative front angle on scale base. turn sleeve is rigidly secured to sector side surface at the centre of turn. Second sector adjoining the first one has front angle scale, turn handle, rectangular edge to read out the cutting angle, sharpening angle and front negative angle. Rectilinear edge extends to the other end from sector turn centre into contact jaw to be pressed to measured tooth rear side face. Contact jaw has the bulge for alignment with contact jaw of the first sector. Solid turn axle is rigidly secured to sector side surface at the centre of its turn and has diametric cut to the depth equal to sector thickness for alignment of measured tooth cutting edge with the sector turn axis centre. Cover is a sector secured to one side of the base so that one rectangular edge is perpendicular to the base symmetry lengthwise axis to make a locating surface. Locating surface is directed through said sector turn axis centre. Narrow rectilinear edge serves to read out the front negative angle.

EFFECT: fast simultaneous measurement of all angles.

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