Caliper Features Caliper Specifications 1 x Electronic Digital Caliper. Motorcycle Parts. Easy read visibility: extra large LCD screen for easy and clear reading.
Read the measurement as shown above. To read the measurement note the main scale measurement immediately preceding the zero line on vernier scale. The zero of the vernier scale immediately preceding 28mm. To this (28mm) must be added the decimal reading on the vernier scale. Note the line on the vernier scale which is coincident with a line on the main scale. 30th line concides with a line on the main scale.
So the reading is 28mm plus 30 divisions of 0,02mm TOTAL: 28mm + 30. 0,02 = 28,6mm MEASURING WITH IMPERIAL VERNIER CALIPER TO WITHIN 0,001in The main scale on the vernier is graduated and numbered in inches with each inch graduated and numbered in tenths (0,1in). Each tenth is divided into four giving 0,1in.
Divided by 4 = 0,025in. On the vernier scale 0,6in is divided into 25 parts.
Each of these has a length of 0,6in divided by 25 = 0,024in. The difference in length between a small division on the main scale and the vernier scale is 0,025- 0,024 = 0,001in. Read the measurement as shown above. To read a measurement note the position of the zero line on the vernier scale in relation to the main scale.
This is shown as 3,00in plus 0,300in plus 2.0,025in which equals 3,35in. To this must be added the number of divisions from the zero line on the vernier scale to the line which is coincident witha line on the main scale, in this case 15 divisions which equals 0,015in the total reading is therefore: Main scale = 3,35in Vernier scale = 0,015in So the reading is 3,35in + 0,015 = 3,365in The vernier caliper should not be used to measure the outside diameter of a cylinder having a radius greater than the depth of the caliper opening.
DIGITAL VERNIER CALIPERS Digital vernier caliper is very accurate and does involve the computations needed by a standard vernier caliper. When the jaws come in contact with the workpiece, the measurement can be read directly from a digital display. CARE OF CALIPERS: 1. Store calipers in separate containers provided. Keep graduations and markings on all calipers clean and legible.
Do not drop any caliper. Small nicks or scratches can cause inaccurate measurements.
Protect caliper points from damage.
Introduction A vernier caliper, as the name suggests, is a type of caliper used for taking measurements with acute precision. Also know as a precision instrument, vernier caliper is used to measure both internal and external distances with utmost accuracy and least error. Vernier calipers are both of manual and digital types.
The manual vernier calipers are the traditional ones and are still used extensively. However, unlike manual calipers, digital calipers display reading on their LCD, instantaneously and without the use of any kind of interpretation by the user. Construction and Main Parts A manual or traditional vernier caliper is an L-shaped measuring instrument with a movable arm. The movable arm is slid to adjust the object in between or around the jaws.
![Vernier Vernier](http://www.craftsmanspace.com/sites/default/files/free-knowledge-articles/vernier_caliper_parts.jpg)
A Vernier caliper has total of four jaws, with two upper jaws used for measuring the internal distances and two lower jaws for measuring the internal distances of objects. The two upper jaws are the smaller jaws of the vernier that are used to measure the internal distances between two parallel sides of an object or an internal diameter.
They are also known as the internal jaws. Whereas the lower jaws are the longer jaws that are used for measuring external diameters or overall length of objects and are known as the external jaws.
A Vernier is also provided with an additional attachment called as the depth probe, a slender stick like structure used for measuring depths inside of an object. The depth probe is attached to the movable arm and moves along with it. The movable arm is also known as the sliding arm and carries the vernier scale, whereas the fixed arm is the main arm and carries the main scale. A Vernier is also provided with a locking scew for holding the arms at a particular place while taking measurement. Thus, the main parts of a vernier caliper are:.
Internal jaws. External jaws. Main arm. Sliding arm. Depth measuring probe.
Locking Screw. Scales A vernier caliper has two main scales – one is known as the main scale and the other is the secondary scale, also known as the vernier scale. The secondary scale is the sliding scale, which moves over the main scale whenever the adjustable arm is moved.
Both metric and inch measurements are provided on both of these scales. Also, each scale is divided into 10 equal divisions and therefore has a least count of 0.1 mm each. While taking measurement, the movable arm is adjusted so as to fit the jaws around or inside of the object. Readings of both, main and vernier scales are important for making the final measurement. However, it is to note that readings in both the scales are taken in a different manner. The main scale reading is taken by looking where the mark, which is just on the left of 0, coincides on the vernier scale, whereas the secondary reading is taken by looking at that mark on the vernier scale which coincides or comes extremely close to a mark on the main scale.
(Click the image below for an enlarged view of a reading.) Reading a vernier caliper is easy and can be learned quickly. However, it requires sound concentration for reaching accurate measurement. Vernier calipers also have a locking nut provided right above the main scale. This helps in locking the movable arm at one particular place for attaining higher accurate measurement and for reducing the error rate. It is also to note that vernier calipers are delicate instruments and utmost care should be taken while handling them.
It is also important that a vernier caliper is well calibrated before use. This means that when the movable arm is brought to its original or closed position, the zero on the main scale should exactly coincide with the zero on the vernier scale. This is extremely important as the caliper measures even the slightest deviation and thus might provide an inappropriate final reading.