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# Toolmaker’s microscope(tmm)

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a small working about tool makers micro scope

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### Toolmaker’s microscope(tmm)

1. 1.  A toolmakers microscope is a measuring device that can be used to measure up to 1/100th of an mm. It works on the principle of a screw gauge, but a few changes were added to it to make its operation more easier.
2. 2.  It needs application of optics too. A light focuses on the object and through lens we can see the shadow of the object, which resembles the object. More clear shadow would be enhance the accuracy of measurement
3. 3.  TMM (toolmakers microscope) has got a robust and strong base such that it can bear and withstand sudden loads. A column with a track is present to carry lens, along with illuminating source in certain TMM’s. Lens has two perpendicular straight lines marked that act as reference lines. Object to be measured is placed on glass table. Glass table is provided with 3 scales on it
4. 4.  Two scales are meant for measuring in X and Y directions and the movement of table the respective direction. The other scale is meant for measuring rotation as well as rotation of table.
5. 5.  Object to be measured is placed on glass table, illuminator is turned on. Let the object be a rectangle. It may look as shown if seen through lens
6. 6. Using the micrometer heads get it to a definable point as shownNote down both micrometer readings
7. 7. Now turning micrometer heads we can getpositions as shown above.After setting 2nd position note down micrometerreading meant for X movementAfter setting 3rd position note down micrometerreading meant for Y movement
8. 8.  Difference in micrometer reading of X movement gives us the length of the rectangle Similarly, the difference in micrometer reading of Y movement gives us the breadth of the rectangle
9. 9. The large tool maker’s microscope is suitable for the following fields of applications; Length measurement in Cartesian and polar co- ordinates. Angle measurements of tools; threading tools punches and gauges, templates etc. Thread measurements i.e., profile major and minor diameters, height of lead, thread angle, profile position with respect to the thread axis and the shape of thread. (rounding, flattering, straightness of flanks) Comparison between centers and drawn patterns and drawing of projected profiles.