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美国的布伦科(Brencor)公司宣称,在测量60°槽精度中已使用一种中心千分尺。该千分尺在测量60°槽时,可直接读出槽底深度的数值。其深度值与锥度值的换算关系是:每0.001英寸深度等于一秒锥度。在使用这种量具时,先将装有承载弹簧的测量柱头压在被测零件上的60°槽上,然后旋千分尺的旋套,直到旋不动为止。此时,就可以象使用其它千分尺那样读出槽深的数值。用淬火工具钢制成的测量柱头设计成自动定中心的式样。为了使测量者能换一个位置读到数值,
Brencor, the U.S. company, claims that a center micrometer has been used to measure the accuracy of 60 ° troughs. The micrometer in the measurement of 60 ° slot, the groove bottom can be directly read the value of the depth. The relationship between depth and taper values is: one second per 0.001 inch depth. When using this gauge, first press the load-bearing measuring stud against the 60 ° slot on the part under test, and then screw the micrometer screw until it stops. In this case, it is possible to read the groove depth as with other micrometers. The stigma made of hardened tool steel is designed as a self-centering style. In order for the surveyor to read a value for a position,