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Its an expensive lesson for me Damaged 2 x Carbide 4mm end mill to realise that the caliper is harden steel. I can mill the rivet w/o prob but when comes to the jaw, the carbide end mill barely cut. 2 Carbide end mill just sufficient to cut off 1 side of the jaw
Did some testing on the caliper few days back, the hardness of caliper jaw is 54 HRC The only cutter able to mill is those with special coating S$70++ each
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