This is the tool maker microscope ppt for simplifying the metrology.

1. TOOL MAKERS
MICROSCOPE

2. Introduction
• A toolmakers microscope is a measuring devise 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.
• It need 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. Construction

4. Construction:
• 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

5. • 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.

6. Working:
• Object to be measured is placed on
glass table, illuminator is turned on.
• Let the object be a rectangle.
• It may look as shown through lens

7. Using the micrometer heads get it to a points as shown
Note down both micrometer readings

8. • Now turning micrometer heads we can get positions as shown above.
• After setting 2 nd position note down micrometer reading meant for X
movement.
• After setting 3 rd position note down micrometer reading meant for Y
movement.

9. Result:
• Difference in micrometre reading of X movement
gives us the length of the rectangle
• Similarly, the difference in micro-meter reading of Y
movement gives us the breadth of the rectangle

10. 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 the
shape of thread. (rounding, flattering, straightness of flanks)
• Comparison between centres and drawn patterns and
drawing of projected profiles.