Which is a disadvantage of an optical comparator?
Disadvantages of Optical Comparator It is not suitable for continuous use due to the scale to be view through the eyepiece. It is suitable to use in a dark room only. Optical instruments are expensive.
What does an optical comparator do?
Optical comparators are a type of optical measuring instrument. The measurement principle is similar to that of optical microscopes. The target is placed on the stage, and a light is shined on the target from underneath. This causes the target’s profile, or shadow, to be projected on the screen.
Which is an advantage of the optical comparator?
Just the versatile measuring capabilities of the optical comparator are a huge advantage of this precision measurement device. Additionally, optical comparators offer more than just dimensions by providing length and width measurements as well as revealing possible imperfections along the surface of a part.
What is a digital optical comparator?
An optical comparator or profile projector machine is a comparator that uses optics to test products for defects and a lack of conformity. The digital optical comparator machine handles this process electronically, which saves time and can remove the need to gather data manually.
What are drawbacks of comparator?
Disadvantages
- (i) The mechanical comparators have got more moving parts than other types.
- (ii) Any slackness in moving parts reduces the accuracy considerably.
- (iii) The mechanism has more inertia and this may cause the instruments to be sensitive.
How do I calibrate my 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 is an optical comparator?
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 measure angles on an optical comparator?
To measure the angle, bring the staggered or hairline—depending on personal preference—on one edge and move the protractor until the line matches up with the other. Then read the angle scale.
Who invented the optical comparator?
James Hartness
Is it even possible to improve upon a workhorse that’s hardly changed in 80 years? This article attempts to answer these questions. The optical comparator is invented by James Hartness, president of J&L Machine Co., in 1922.
What are the types of comparator?
Types of Comparators
- Mechanical Comparator.
- Mechanical-Optical Comparator.
- Reed Type Comparator.
- Electrical-Electronic Comparator.
- Pneumatic Comparator.