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Dial Indicators are measuring devices used in mechanical and industrial applications. They are designed to measure in vertical or horizontal positions and typically used to measure clearances, tolerance, and variation in tolerance of machined parts to ensure accuracy.
How does a dial test indicator work?
Dial test indicators are used to test parts for runout and surface distortion. Each mark around the dial face of an indicator represents 1/1000 of an inch. When the hand falls between two marks, it is ok to average between the two or to round up or round down depending on your regulations.
What are dial gauges or dial test indicators used for MCQ?
Explanation: A revolution counter is present in dial gauge, if the pointer makes more than one revolution, it will correctly indicate the number of revolutions and enable a complete reading to be made when the indicator is used for direct measurement.
What are the types of dial indicators?
Types of Dial Indicators: Balanced reading dial indicator. Continuous Dial Indicators. Reversed Balanced Dial Indicators. Reversed Continuous Dial Indicators. Plunger Dial Indicator. Lever Dial Indicator.
What is the difference between test indicators and dial indicators?
In general, the two tools are used in different applications: Test indicators are utilized for layout work on surface plates or aiding in part setup during the machining process while dial indicators are used for comparative measurements with gages and fixtures.
Where are dial gauges used?
Dial indicators are one of the primary measuring tools used in precision engine building. They are typically used to measure deck clearances, crankshaft thrust and straightness, lifter travel and other measurements that involve the distance between two surfaces or small amounts of component travel.
What should be avoided while using a dial indicator?
Don’t clamp indicator against the stem with a set screw. Too much pressure will make the rack spindle bind, causing the indicator to become sluggish and sticky. Don’t lock the indicator in position until you’ve set it carefully under proper gaging tension, that is, at least a quarter turn from its “at rest” position.
Why revolution counter is used in dial gauge?
Long range dial indicators will almost always have a revolution counter. It is used to keep track of the number of times the indicator hand has moved past zero, much better than your eye could. With a combination of the revolution count and the graduation count, a measurement can be determined.
What is the use of telescopic gauge?
Telescoping gauges are indirect measuring devices used to measure the internal diameter of a bore, hole, groove, slot, etc. This T-shaped tool consists of a handle, two telescopic rods and a locking screw.
What are 2 types of dial indicators?
Types of Dial Indicators Balanced Reading Dial Indicators. Balanced reading dial indicators are so named for the way that information is arranged upon the dial’s face. Reversed Balanced Dial Indicators. Test Dial Indicators. Lever Dial Indicators.
What is dial indicator magnification?
The amount of magnification of an indicator depends on its use and desired resolution. Dial indicators can have gear trains that amplify the movement anywhere from 40:1 to 1,500:1. This can give a dial indicator a discrimination, or resolution, of 0.001 inch to 0.00005 inch.
How do you use dial indicator to align shafts?
For shaft alignment, we typically use dial indicators with 0.250″ – 0.300” total travel. The plunger moves a needle clockwise when pushed in and counter clockwise when let out. The face can be rotated so that the needle points to zero.
What is dial indicator in metrology?
Dial indicators are instruments used for making and checking linear measurements. Most of the dial indicators take the form of a circular or semicircular scale upon which a pointer gives a direct indication of the movements of a contact arm or spindle.
Can you oil a dial indicator?
Only individuals trained in the proper methods should open up the case to oil the jeweled movement. Dial indicators that have been cared for properly will rarely require this. Use a soft, lint-free cloth to remove dirt and oil from the spindle.
How do you zero a dial indicator?
Rotate the face of the indicator until the “0” marking aligns with the dial. Tighten the knob afterward to lock the face in position. Twist the zero adjustment knob if your dial indicator does not feature a rotating face. Continue twisting the knob until the dial aligns with the “0” marking.
What should be avoided while using a dial indicator * sudden contact with the workpiece surface over tightening of the contact points side pressure all of these?
As the lever moves the mechanical indicator starts traveling. an indicator shows relevant results with respect to lever movement. The user should avoid sudden contact with the workpiece surface, over-tightening of contact points, and side pressure.
Which of the following is provided in dial gauge to raise the plunger?
Explanation: The dial gauge instrument is used in such a way that plunger move sharply in either direction. So the instrument should be made so that by such movement, it will not be damaged and its accuracy and setting will not be spoiled. A knob or finger lever is provided for raising the plunger. 3.
Which of the following is used to calibrate dial gauge?
Explanation: Zeiss interferometer is a compact instrument which is used for absolute comparative measurement of slip gauges.
What is a balanced dial indicator?
On a balanced dial indicator, the dial reading runs in two opposing directions away from the zero point in the center. These are typically used when the tolerances of a measurement are bilateral, for example ±0.002 inch, because the dial is similarly balanced in either direction.
How do telescoping gauges perform and report measurement telescoping gages report measurement?
How do telescoping gages perform and report measurement? Telescoping gages report measurement: NOT Through three points of contact. NOT Through directly measuring the hole span.
What is telescopic feeler gauge?
DESCRIPTION. Telescoping Gage has a measuring range of 2-1/4 to 3-1/2″. Equipped with a spring-loaded plunger that expands within the bore or groove, allowing determination of the internal diameter or groove width and has a knurled clamp.
How accurate is a dial indicator?
The dial indication should be accurate to within + 1 graduation, at any point with 2.3 turns, i.e. the variation of the actual object size in relation to the setting master must be displayed by the pointer position on the dial with a maximum error of ± 1 graduation, at any position within 2.3 turns for effective.
