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The cutting forces generated in metal cutting have a direct influence on tool wear or failure, quality of machined surface and accuracy of the work piece. In this paper, a turning dynamometer that can measure static and dynamic cutting forces has been designed and constructed, we put Fiber Bragg Grating sensor into cutting force. In order to reduce interference of the test data, we designed an octagonal ring as sensitive element. We used strain gauges and Fiber Bragg Grating sensor to detect surface strain of the elastic rings and get different sensor's data. Contrast the data to optimization the fiber grating mounted places. Finally, experiments with different sensors to show that the Fiber Bragg Grating sensor could be used reliably to measure cutting forces.