1. Basic introduction
A feeler gauge, also known as a thickness gauge, is made up of a set of overlapping thin steel sheets of different thicknesses and a section loosely riveted together, as shown in the figure. Each piece is engraved with its own thickness value. In the maintenance of thermal equipment, it is often used to detect the gap between fixed parts and rotating parts and check the degree of contact between mating surfaces. When checking whether the measured size is qualified, the pass-stop method can be used to judge, or the inspector can judge based on the tightness of the fit between the feeler gauge and the measured surface.
2. How to use
(1) Wipe the feeler gauge and measuring surface clean with a clean cloth before measuring.
(2) When measuring the gap, select a feeler gauge of appropriate thickness and insert it into the gap to be measured, and then pull the feeler gauge while adjusting. If the resistance is too large or too small when pulling, it means that the gap value is smaller or larger than the value marked on the feeler gauge; tighten the locking nut until you feel a slight resistance. At this time, the value marked on the feeler gauge is the measured gap value.
(3) If the thickness is not suitable, several pieces can be combined for measurement at the same time. It is generally controlled within the 3~4 pieces. If it exceeds 3, a correction value is usually added. According to experience, generally add 0.01mm correction value for each additional piece.
3. Precautions
(1) It is not allowed to bend the feeler gauge violently during the measurement process, or use a large force to insert the feeler gauge into the gap to be detected, otherwise the measurement surface of the feeler gauge or the accuracy of the part surface will be damaged.
(2) After use, wipe the feeler gauge clean, apply engine oil, and then fold the feeler gauge back into the clip frame. Do not place the feeler gauge under heavy objects to prevent damage from rust, bending, and deformation.
Source: Maintenance Circle