SU1366860A1 - Micrometric instrument - Google Patents

Abstract

The invention relates to the field of instrumentation technology, in particular for measuring linear dimensions in mechanical engineering. The aim of the invention is to increase the accuracy of reading the measurement results. The micrometric instrument consists of a stem 4 with an outer cylindrical surface on which a linear scale and two rows of screw lines 12 opposite in direction are applied, a smooth measuring rod 3 with a locking device consisting of a sleeve 8 and a screw 9, and movable relative to the rod 3 and 4. stem drum 5 with a dial. The transfer function of the screw pair is performed by the helix lines I2 in the readout device, which makes it possible to improve the accuracy of reading the measurement results. 3 il. with

Description

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measurement technology, in particular, to the means of measuring linear dimensions in mechanical engineering.

The aim of the invention is to increase the accuracy of reading the measurement results by depositing on the stems of a known micrometer two rows of additional screw lines of the left and right directions and making the drum turnable around an axis.

Figure 1 shows the assembled micrometric instrument; figure 2 is a section aa in figure 1; Fig. 3 shows the counting device.

A micrometric instrument consists of a stitch 1, reproducing a fixed measuring surface and 20 fixed in bracket 2, measuring rod 3, stem 4 fixed in bracket 2 and movable relative; rod 3, the drum 5, movable relative to the rod 3 and the stem 4, the spring 6, fixing the axial position of the drum 5, the locking cap 7 and the locking device of the rod 3, consisting of the sleeve 8 and screw 9. Connecting the rod 3 to the drum 30 5 and the stem 3 with the stem 4 are movable around the axis. Readout device. It consists of a linear scale 10 stem 4 and a dial 11 drum 5. On the surface of the stem 4 there are two rows of screw lines 12 opposite, right and left, of directions having a pitch equal to twice the price of dividing the linear scale 10, the interaction of which; with the axially movable and circular directions of the scale 11 of the drum 5, it is possible to realize the function of strengthening the measured quantity with greater efficiency:

The rod 3 is brought into contact with the test piece and stops in this position; the drum 5 is rotated so that the zero division of the dial scale 11 is aligned with the lower, left in the direction of the helix, and in this position the drum 5 can be fixed by turning the cap 7.

The measurement result is the sum of the readings of the linear and circular scales 10 and 11. In this case, the indicator of the linear scale 10 is the edge of the drum 5, and the indicator of the dial scale 11 is upper, right in the direction of the screw line

In the general case, the indication x of the measuring instrument is related to the cost of dividing C, the linear scale, the spacing S of the helical lines and the number n of divisions of the circular scale by the following expression:

P

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c, + n J --- (mm),

where P | - counting of whole divisions according to the longitudinal scale 10; Hjj is a reading on a circular scale 11. For example, with values of с, 2 mm, S 4 mm, and n 50 divisions, the reading on the reading device is 8.32 mm (Fig. 3).

Claims (1)

Invention Formula A micrometric instrument containing a measuring rod, mounted on it with the possibility of translational movement of the stem with a linear scale and helix applied on its outer cylindrical surface and a dial drum, characterized in that, in order to improve the accuracy of reading the measurement results, 40 the outer cylindrical surface moving the rod 3, the distance between the interstitial, 45 stem is caused by two additional ones starting and ending points of the spindle of the screw lines of the right and left counts, representing a direction signal with a step equal to twice the output of the measuring instrument, two the cost of dividing the linear scale, with times greater than with a single screw this, each pair is opposite along the line, since the starting point of the spiral lines begins to move in the opposite direction of course th point of reference. In this case, the measurement and counting is performed at each elevation of the linear scale and ends at the intersection point of the same lines, and the drum is mounted on the measuring rod with the possible procedure as follows. 0 R 20 30 The rod 3 is brought into contact with the test piece and stops in this position; the drum 5 is rotated so that the zero division of the dial scale 11 is aligned with the lower, left in the direction of the helix, and in this position the drum 5 can be fixed by turning the cap 7. The measurement result is the sum of the readings of the linear and circular scales 10 and 11. In this case, the indicator of the linear scale 10 is the edge of the drum 5, and the indicator of the dial scale 11 is upper, right in the direction of the screw line In the general case, the indication x of the measuring instrument is related to the cost of dividing C, the linear scale, the spacing S of the helical lines and the number n of divisions of the circular scale by the following expression: P c, + n J --- (mm), where P | - counting of whole divisions according to the longitudinal scale 10; Hjj is a reading on a circular scale 11. For example, with values of с, 2 mm, S 4 mm, and n 50 divisions, the reading on the reading device is 8.32 mm (Fig. 3). Invention Formula A micrometric instrument containing a measuring rod, installed therewith with the possibility of translational movement of the stem with a linear scale and helix applied to its outer cylindrical surface and a dial drum, characterized in that, in order to improve the accuracy of reading the measurement results, the outer cylindrical surface of the stem has two additional rows of screw lines of the right and left directions with a step equal to twice the price of dividing the linear scale, each pair of screw lines opposite in direction begins- in each elevation of the linear scale ends at the intersection of the same lines, and the drum is mounted on the measuring rod with the possibility of rotation around its axis. Aa FIG. 2 sried