How do you calibrate an optical comparator?

The correct way to calibrate the screen with a master glass scale on the stage, magnify it on the screen and measure the image projected by another glass reading scale. If an overlay is not used or magnified, the image on the screen is never measured. In this case, the magnified accuracy should not be a problem.

How accurate are optical comparators?

As stated before, the accuracy of an optical comparator is approximately 0.0005” while a vision systems capabilities are double that at approximately 0.0002”.

How do you use an optical comparator?

Measurement by Optical Comparator Place the object to be measured on the screen and adjust the height of the table to focus. Next, align the orientation of the side you want to measure on the projected image with the orientation of the screen reference line, and adjust the value of the XY stage to 0.

What is the working principle of an optical comparator?

The optical comparator uses the reflection of light as its basic working principle. The optical comparator projects the magnified image of the workpiece in the display screen to compare with the standard parameter. This device is contactless with a workpiece while projecting its image on the screen for magnification.

What do optical comparators measure?

Comparators inspect, measure, and compare the dimensions of manufactured parts. These measurement tools function using the principles of optics by utilizing illumination, lenses, and mirrors to project a magnified silhouette of a part upon a screen. Doing this compares the part to its prescribed limits.

Is an optical comparator a CMM?

An optical CMM, similar to optical comparators and measuring microscopes, is a non-contact instrument that uses images to perform measurements. Optical CMMs are also known as CNC image measuring machines, where “CNC” is an abbreviation of Computer Numerical Control.

Which is an advantage of the optical comparator?

Advantages of Optical Comparator High accuracy will be achieved as it has very few moving parts. Less weight than other comparators because of fewer parts. The parallax error will be avoided. Due to the high magnification, very suitable for accurate measurement can be obtained.

Which is a disadvantage of an optical comparator?

more moving parts, the friction is more and ultimately the accuracy is less. (ii) Any slackness in moving parts reduces the accuracy considerably.

What are the advantages of optical comparator?

What is line standard and end standard?

The most common line standard is the division marked meter rule. When the distance between two parallel surfaces is used as the standard for measuring length, it is known as end standard or end measurement. The end standard is primarily used in the workshop for precision measurement.