What Is a Dial Gauge?

The dial indicator is a length measuring instrument that converts a general linear displacement (linear motion) into a rotary motion of a pointer by a gear or a lever, and then performs a reading on a dial. The dial indicator is a widely used indicator gage in precision measurement. It is a comparative measuring tool. It can only measure relative values, not absolute values. It is mainly used to check the shape and position error of the workpiece. (Such as roundness, flatness, perpendicularity, round runout, etc.), also often used for precision alignment of the workpiece.

Universal table type using precision rack and pinion mechanism

1.Dial dial indicator Dial indicator with a scale of 0.01mm

Movement of the measuring axis by 1mm is equivalent to one rotation of the long axis, and the measuring range ranges from 5mm to 10mm.

Dial gauge with 0.001mm scale

(3) The movement of the measuring axis by 0.2mm is equivalent to one rotation of the long axis, and the measuring range ranges from 1mm, 2mm, and 5mm.

2.Dial dial indicator

In the dial indicator of dial type, there are generally dial indicators according to 0.01mm, with measuring ranges of 0.5mm and 0.8mm, and dial indicators according to 0.002mm, with measuring ranges of 0.2mm and 0.28mm.

3. Electronic digital dial indicator.

4. Digital display thickness gauge.

5. Digital indicator dial indicator.

The structure of the dial indicator is relatively simple, the transmission mechanism is a gear train, the outline size is small, the weight is light, the transmission mechanism is small inertia, and the transmission ratio

When the measuring rod moves by 1 millimeter, this amount of movement is amplified by the rack, shaft gear 1, gear and shaft gear 2 and transmitted to the pointer mounted on the shaft gear 2 to make the pointer rotate once. If the circle scale is printed with 100 equal divisions along the circumference, each division value is equivalent to the amount

1. Fix the watch on the base or stand, which is stable and reliable. When clamping the indicator, the clamping force should not be too large, so as not to deform the sleeve and jam the measuring rod.

2. The axis of the measuring rod of the adjustment table is perpendicular to the plane to be measured. For cylindrical workpieces, the axis of the measuring rod should be perpendicular to the axis of the workpiece. Otherwise, a large error will occur and the indicator will be damaged.

3. Zero position before measurement. A flat plate is used as the zero reference for absolute measurement, and a comparison object (gauge block) is used as the zero reference for comparative measurement. When adjusting the zero position, first make the probe contact the reference surface, press the probe to rotate the large pointer more than one turn, turn the dial to align the 0 line with the large pointer, then lift the upper end of the measuring rod 1-2mm and let it fall After repeated 2-3 times, check whether the pointer is still aligned with the 0 line, and readjust if it is not uniform.

4. When measuring, gently lift the measuring rod with your hand and place the workpiece under the measuring head for measurement. Do not force the workpiece under the measuring head. Significantly uneven workpieces need not be measured with an indicator.

5. Do not make the measuring rod suddenly hit the workpiece, and do not shake or hit the indicator.

6. Pay attention to the measuring range of the meter when measuring. Do not move the probe beyond the measuring range to avoid overstretching the spring and damaging the indicator.

7. Do not make the probe and the rod do too much invalid movement, otherwise it will accelerate the wear of the parts and make the meter lose its due accuracy.

8. When the movement of the measuring rod is blocked, the probe cannot be pushed strongly, but must be sent to the measuring room for processing.

The above is an introduction to dial gauge tools in commonly used gauges. Dial gauges, as a high-precision measuring instrument in mechanical length measuring tools, have been widely used. When we use dial gauges, we must follow Use the correct method to operate, so as to ensure the accuracy and service life of the instrument's measurement data.

1. Appearance: The dial of the dial indicator should be transparent and clean, without air bubbles and obvious scratches; the dial engraved lines should be clear and straight, broken lines and uneven thickness without visible eyes; there should be no touch on the probe Bruises, rust, spots and visible scratches. There should be no paint removal, chrome removal, and

When taking the reading, first take the end surface of the differential tube as the guideline, read the graduation value of the scale line under the fixed sleeve (read only the integer in millimeters), and then use the horizontal horizontal line on the fixed sleeve as the reading standard. Line, read out the division value on the movable scale. When reading, you should estimate to read one-tenth of the minimum scale, that is, 0.001 mm. If there is no upper scale line between the end surface of the differential cylinder and the lower scale line of the fixed scale, the measurement result is the value of the lower scale line plus the value of the movable scale; for example, there is an upper scale line between the end surface of the differential cylinder and the lower scale line. , The measurement result should be the value of the lower scale line plus 0.5 mm, plus the value of the movable scale,

Some micrometers have a movable scale of 100 equal divisions and a pitch of 1 mm. The fixed scale does not require a half-millimeter scale. Each division of the movable scale still represents 0.01 mm. Some micrometers have a movable scale of 50 equal divisions, but there is no half-millimeter scale on the fixed scale, which can only be estimated by the eye. For eliminated

Keep the watch away from liquids and avoid contact with coolant, cutting fluid, water or oil.

When not using the indicator, release all loads and leave the measuring rod in a free state.

Except for long-term use, do not apply any grease on the measuring rod to avoid sticking.

Do not knock, bump or hit.

Do not make the measuring rod suddenly hit the workpiece, and do not shake or strike the indicator.

Pay attention to the measuring range of the meter when measuring. Do not move the probe beyond the measuring range to avoid overstretching the spring and damaging the indicator.

Do not make the probe and rod do too much invalid movement, otherwise it will accelerate the wear of parts and make the meter lose its due accuracy.

When the movement of the measuring rod is blocked, the probe cannot be pushed strongly, but must be sent to the measuring room for processing.