Now, in locking the tail spindle to obviate these difficulties, it is desirable that the locking device shall hold that spindle axially true with the live spindle of the lathe, notwithstanding any wear that may have taken place.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose
First, to have the lathe centres axially true with the work when grinding tapers, so that the lathe centres shall not wear and gradually throw the work out of true from the causes explained in the remarks on turning tapers in a lathe of ordinary construction.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose
The lathe centres should, for parallel work, stand axially true one with the other, and this can only be the case when the live centre runs true.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose