1) Due to vibration in machining the chatter mark formed on the part as there was no support to resist the vibration and reached the customer without identification.|2) Due to the machining constrain the tool length selected was high but the chattering formed was less which was cleared by manual rework, but during this time the chattering marks formed was high and got moved to the next operation.|3) During the final inspection the inspector identified the chattering and sent the part back to rework but did not re-inspected the part after the rework.|4) Inspector thought that the Chattering mark would be cleared by the fitter during rework.