Cast iron V-frame is divided into cast iron or marble material Accuracy: divided into high-precision, two kinds of ordinary precision, cast iron V-frame specifications introduced: V-frame Uses: mainly used for shaft parts of the test, calibration, draw line, the workpiece can be used to test the vertical, parallel. A cast iron V-frame by JB / T8047-95 standards for manufacturing, also known as V-frame, commonly used three v-shaped iron, single-port V-iron and five V-shaped iron. V-iron HT200-250 using high quality materials, paired supply, primarily for the detection precision shaft parts, dash, instrument and fixed clamping machining. Two, V-frame accuracy: into one, two, three. Three, V-shaped frame is mainly used to place a circular piece shafts, sleeves, discs, etc., in order to find the center line and draw the centerline. A pair of generally V-shaped frame is two, two plane and the V-groove is milled in a single installation. Precise dimensions of the surface parallel to each other between the V-shaped frame, the vertical error within 0.01 mm, the center line of the V-grooves must be within the plane of symmetry V-frame and parallel to the bottom surface, concentricity, parallelism error also within 0.01 mm of, V-groove half-angle error is within ± 30 ~ ± 1 range. Precision V-frame also can be crossed, V-shaped frame with a frame holding the bow, cylindrical workpieces can be clamped firmly in a V-rack, flip to various locations crossed.