Blade feet Uses: mainly used in light-gap method for straightness measurement and flatness measurement, together with the gauge block used to test the plane accuracy. It has a simple structure, light weight, no rust, easy to operate. The measurement of high efficiency, which is a commonly used measurement tool for machining. 

 Blade foot Material: magnesium alloy and steel are divided into customer demand. Magnesium alloy blade foot light weight, easy to use, easy to distort, not rust, easy to custody. 
 Blade foot Usage: mainly used for the detection of flat, flat feet, machine table, rails and precision of the workpiece flatness, straightness 
 Blade foot Specifications: 
 Specifications (mm) 
 5006007501000 
 1500 2000 3000 4000 
 Knife-edge ruler test methods: 
 The length of not less than the check blade-shaped ruler measuring the surface length L of the flat-foot light-gap method for detection. Detection, flat feet with two high-point support, support and resistance anomaly feet at both ends of 2/9 length of the light box placed in flat-foot rear. Then check blade-shaped ruler measuring surface in contact with flat feet, measured along the blade-shaped ruler surface arc self-test surface perpendicular to the square foot measurement surface location within the scope of the 22.5 ° rotation to both sides of the observation of the blade-shaped straight transmittance gap between the ruler measuring surface and flat feet, and with the standard optical gap compared to determine the gap value of light transmittance. 

 Standard optical gap gauge block peace crystal composition; 0 gauge block for straightness tolerances 0.5um of the blade-shaped ruler, greater than 0.5um, less than or equal to 1.0um, a gauge block is greater than 1.0 um of two gauge blocks. 

 Blade foot test workpiece flatness: 

 1) blade-foot vertical close to the workpiece surface, and vertical, horizontal and diagonal direction of successive checks. 

 2) test, if the knife-edge ruler and the workpiece plane transmittance weak and uniform flatness of the workpiece qualified; to varying light intensity, then the workpiece flat uneven. With a feeler in the knife-edge ruler and workpiece close at insertion, according to the thickness of the feeler gauge to determine the flatness of the errors.