What is a profile projector used for?
The profile projector is a precision optical instrument used in watchmaking for the inspection and measurement of the outlines of parts with complex profiles, such as gears. It makes it possible to observe complex profiles and quickly detect the slightest inaccuracy.
Function and use
The profile projector projects the magnified shadow of a part onto a screen, making visible, at a scale often several tens of times larger, the smallest details of its contour. This projection facilitates the comparison between the actual profile and a technical drawing to a scale corresponding to the magnification of the projector’s optics.
The plan printed on a transparency overlay is superimposed on the table or the projection screen and any defects (dimensions, concentricity, etc.) in the profile of the component are quickly and easily identified.
In watchmaking, this tool is used to analyze and check the geometry of parts such as wheels, cams, pinions, teeth, or components with a complex profile.
Characteristics
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Magnifying optics : The profile projector has a system of lenses and mirrors allowing magnification at different scales.
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Projection screen : A flat surface, often backlit, on which the shadow cast by the part is displayed, offering sharp contrast and facilitating analysis. A template of the plan of the component to be tested is superimposed on the projected shadow of the component under testing.
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Light source : A powerful lamp illuminates the component and projects its outline with precision.
Importance in watchmaking
The profile projector plays a key role in the quality testing of watch parts, whose shape accuracy determines the performance and lifespan of the Movement. It allows very detailed visual testing to be carried out quickly, complementing the quantitative measurements taken with instruments such as the Micrometre, the Caliper (vernier caliper) or other optical devices (such as lasers). It is simple and quick to use.
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