Vernier caliper in the application of the deep groove measurement

Vernier caliper in application of 2019 - deep groove measurement 11 - 22 ShiGuoWei ( Hangzhou advance gearbox group co. , LTD. ) In this paper, a homemade measuring head installed on ordinary vernier caliper, without destroying the premise of vernier caliper, can accurately measure the parts in all kinds of narrow groove, deep groove of the diameter of the solution. The company in parts manufacturing process, often encounter need to measure a narrow and deep inside and outside the ring groove parts ( See figure 1) , these parts groove structure caused the common measuring tool is difficult to obtain accurate measurements of problem, the standard of groove width vernier caliper, foot is too big, can't deep groove, so oneself to carry on the transformation of ordinary vernier caliper, design special detachable type measuring head, very good solve the problem. Design of figure 1 ring groove structure analysis of the parts, I choose quantity of 0 ~ 300 mm single claw vernier caliper, the vernier caliper card feet long, therefore modified measuring range is larger, suitable for measuring various deep inside and outside the ring groove. Figure 2 for I design a special measuring head, the measuring head is detachable structure, middle square hole effectively cooperate with foot, fit clearance in 0. 02 mm left and right symmetry requirement and control the square hole, square hole a design a 120 & deg; V-shaped surface, on the card feet in a convenient location, with a knurled copper screw clamp, measuring head head design into ball head shape, head requires hardness, to ensure that the wear-resisting, ball head shape measurement of measuring head can guarantee are in high position, in order to improve the accuracy of measurement. The diameter of the probe is 1. 8 mm, length control in 9 mm, on the basis of the guarantee strength, expand the measurement range. Method of use (2 1) Measuring the inner ring groove, the first with a homemade measuring head installed on the vernier caliper card feet, measuring ball head outwards when installation as shown in figure 3, keep the two measuring head in the same line, screw locking them with bronze. Then push the vernier caliper so far and no clearance together with outside micrometer to measure and close the distance of the two measuring head after A, at the same time record the reading on the vernier caliper C at this time, and then use the caliper to measure the inner ring groove, direct reading the reading on the vernier caliper B, so the bottom of the channel diameter size of D = B + A - C. （ 2) When measuring the outer ring groove, the first homemade measuring head reverse installation as shown in figure 4, the measuring head when adjusted to A line with copper screw locking, vernier caliper to measure head and tight position, directly on the caliper read reading A, then outer ring groove size is measured with vernier calipers, to measure the maximum when reading for B, then the groove of the outer ring groove bottom diameter is D = B - A. 3 epilogue to want to use a ordinary vernier caliper to measure the depth of the bottom of the channel size, design a simple measuring head, you can put it into a slot inside and outside general vernier caliper, solved the difficult to measure in production of narrow groove, deep groove, such a convenient and practical. Other removable measuring head design, and does not destroy the original vernier caliper, modification cost is low, in the machinery manufacturing industry has a great significance in promoting. Source: the metal processing ( Cold working) Magazine,