Calipers

A vernier caliper

1 Definition: the use of a cursor on the principle of measuring surface relative movement of the two separate readings of the distance measurement apparatus.
2 structure type:
Divided into type Ⅰ, Ⅱ type, Ⅲ type vernier caliper
3 reading methods:
(1) to read an integer - see the cursor to the left of the zero line, foot line of the body closest to the value of a moment, read out the measured size of the integer part of the
(2) read decimal - see the cursor to the right of the zero line, read the first few trips marked groove groove aligned with the ruler, read out the measured size fraction (ie Vernier reading by the alignment groove sequence number);
(3) come to the measured size - the above two readings of the integer and fractional part of the sum, is the measured caliper dimensions.
4 to use a vernier caliper:
(1) measurement of external dimensions, it should first jaw opening slightly larger than the measured, then measure the claw and fixed by the measured surface, and then slowly push-foot box, make the activity measurement claws gently touch measured surface, and swim a little bit active measurement claws, in order to identify the minimum size of site, to obtain the correct measurements. Caliper measurement of two claws should be measured perpendicular to the surface. Similarly, after reading activities to measure claws removed first, then remove the caliper from the device under test; not release the claw in the activity measured before, does not allow caliper down violently.
(2) measure the bore diameter should be measured first open claw smaller than the measured size, and then fixed measuring jaw against the hole wall, then slowly pull the foot box, make the activity measured along the diameter direction of the claw gently touch the hole wall, then measure the swimming claw a little bit in the pore walls, in order to identify the maximum size of parts. Note that the hole should be placed on measuring the diameter of claw direction
(3) measuring the groove width, the caliper measurement of pore size and method of operation is similar to the location of measurement should also be put right claw to perpendicular to the groove wall.
(4) measurement of depth, should be under the caliper end of the ruler with the top surface of the device under test fit, push the depth of feet, so gently touch the underside of the measured,
(5) measurement of the hole center and measured the distance between the plane,
(6) measured from the center of two holes.
5 Notes on measurement
(1) measurement of force should be appropriate to use with a micro-device (measured force while the control) of the caliper
(2) selection of the appropriate parts of the claw measurements, the measurement should be avoided while using the blade-shaped measuring surface near ruler flat measuring surface.
(3) measurement of temperature should be appropriate, when the caliper and measured the temperature of the same pieces, measuring temperature and standard temperature tolerance may be relaxed.
(4) The appropriate increase in the number of measurements, taking the average.
6 Maintenance of use of vernier caliper vernier caliper, measuring instruments in addition to compliance with the general maintenance issues, but also note the following:
(1) does not allow the caliper measurement of two with a claw as a screw wrench, or the tip of the claw as a measurement crossed tools, compasses, etc.
(2) are not allowed to replace the caliper calipers, card board, sliding back and forth on the device under test.
(3) caliper size boxes and moving micro devices, do not forget to loosen the fastening screws; but do not loose too excessive, so as not to screw off the loss.
(4) caliper measurement should end flat, especially the large size of the caliper should note that the body will be bent or deformed feet.
(5) feet with a depth vernier caliper, after which, we should measure the claws close up, feet or smaller depth exposed on the outside, easily deformed or broken.
(6) calipers are used up, to wipe the oil, into the caliper box, careful not to rust or stain.

Two. Height vernier caliper

1 Definition: the principle is the use of the cursor in the foot box of the device on the dash jaw face, or measuring head and the base surface relative movement of the separation distance for reading a measurement apparatus. Can be used to measure the height of the workpiece size, relative position and precision crossed and so on.
2-foot height of the structure type:
3-foot height and caliper to use methods of operation and reading much the same.
(1) crossed, the test pieces should be placed on the plate, move the foot box to dash jaw size is close to the desired height, tighten the micro-screws on the device, and then rotate the micro-nut, crossed jaws aligned to the required size, then tighten the screws to secure the foot box. With one hand or two hands to hold the base and a little pressure evenly along the flat slide, the device under test needs to draw a horizontal line. Note: the base of the foot grip Shoujin highly uniform appropriate to make the base fit flat, smooth sliding, but should not jump to vibrate, when crossed to not allow the base tilt.
(2) foot height can be used for absolute measurements can also be used for relative measurement.
(3) lever dial indicator (or lever dial gauge) instead of zero indicates the amount of claw.
(4) foot height measurement or crossed to work in the plate (platform) on, so make flat, the device under test, a high degree of foot claw base surface and measuring the measurement surface so clean, can be measured or crossed.
(5) foot height after use to remove the claw measurements, the height of feet standing up, not lying down put. Moving foot height, the base should be single-handedly lift up one hand and held onto the ruler, horizontally or vertically and is not allowed to mention ruler, in order to avoid a high degree of foot drop or foot body deformation.

Third, the depth of the vernier caliper

1 Definition: the use of cursor-foot box on the principle of measuring the surface area and size measurement of relative movement of the body separated from the readings of the measuring apparatus. Hole can be measured (step holes, blind holes), and groove depth, step height and shoulder length.
2 structure type:
3-foot depth of the depth scale use of methods of operation and reading vernier caliper with roughly the same.
(1) foot box measuring surface is relatively large, should be checked prior to use if there are burrs, rust and other defects; to measure the surface of the oil clean, dust and chips and so on.
(2) Depth Gages can be used for absolute measurement and relative measurement. Measurement, to release the fastening screws, the foot frame measuring surface against the top surface of the device under test, the left hand a little pressure, do not tilt, right down to push the ruler, when the ruler and measured under the bottom end contact, you can read; or use screws to secure the ruler, to remove the depth gauge readings.
(3) feet deep used up, we should scale back the body in situ, with clamps to live, so as not to fall off.

Fourth, dial calipers

1 Definition: dial calipers and vernier caliper is similar to the shape, it is the use of mechanical transmission, the two measurements into a surface indication of the relative movement of the rotary table pointer movement, and with ruler ruler and measure the surface of the two tables indicate the relative movement The readings are separated from the measuring apparatus.
(2) Type: divided into Ⅰ, Ⅱ type two,
3 Use and readings:
1 dial calipers and vernier caliper uses the same measurement accuracy more.
(2) dial calipers and vernier caliper using the same method. Reading device is a ruler and instruction sheet composed of two parts, when the foot box on the activity measurement claw-foot body with a fixed measuring jaw lamination, foot box on the left line "reading area" and the ruler of the "0" groove on Qi, indicating pointer is located just above the table and refers to the "0", then the distance between the two measurement claws zero. Measured with the foot to move a box to the right location, then the activity measurement claws and fixed measurement is the distance measured between claw size. Measured size of the integer part from the "reading area" on the left of the ruler scale online reading, and the fractional part of the table pointer by reading the instructions.

Fifth, electronic digital calipers

1 Definition: is the use of electronic measurement and digital display principle, the relative movement of two surfaces separated by measuring the distance from the reading of the measuring apparatus.
2 structure type:
3 Use and readings: use the same with the corresponding calipers, the display can be read directly from the measured values.

Sixth, the depth of electronic digital caliper

1 Definition: is the use of electronic measurement and digital display principle of the foot box measuring ruler measuring the surface area and separated from the relative movement of the measuring apparatus for reading.
2 structure type:
3 Use and readings: use the same with the corresponding calipers, the display can be read directly from the measured values.

Seven, a high degree of electronic digital caliper

3 Definition: is the use of electronic measurement and digital display principle of the device in the foot box on the dash face and jaw relative to the mobile base surface separation distance for reading the measuring apparatus.
4 structure type:
3 Use and readings: use the same with the corresponding calipers, the display can be read directly from the measured values.