When we process the threaded bottom hole on the brake disc of the car in batch, because of the high precision of the hole position, the three-point centering drilling jig that started to be used has insufficient three-point expansion force and slight displacement during drilling. As a result, the hole position does not meet the pattern requirements. Later, we improved and designed a disc-shaped expansion-type centering drilling jig to better solve the above quality problems.
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Shaoxing Biaoyi Hardware Products Co., Ltd. , https://www.byeob.com