1)Thread no go answering and dent observed during the first off part proving time.|2)Due to wrong Z-offset the tool crashed over the part during the first thread pass and due to which the part got bend and resulted in thread no go answering.|3)Operator was not aware of how to take the offset for this part.|4) Usually the offset were taken from the cutting edge of the threading insert but for this part the offset had to be taken from the face of the threading insert as there is very less space for relief after the end of the thread and the operator was not aware of that.