With our handy dandy tramming tool still in the quill lower the head (not the quill) so the dial indicator has a good reading. Record this number.

• 这鬼文没有看明白，他旋转的什么（怀疑应该是旋主轴）太多名词不认识，要测什么，图6，图7读出的差值说明什么?