Yes the machine in question is a 1992 mori seiki TL-40 that is sitting behind the Mazak 450m that i run daily. The mazak also has a "live" tailstock.
I have only used dead centers in it.
I have been at this company for a year and nobody has run the TL-40 (maintenence issues). Walking by i happened to notice the live center in the quill and thought it rather strange to have a live center in a tailstock with bearings.
Probably the last fellow who worked here had some strange reason for using it
Can the tailstock quill be locked to allow drilling?
No the quill cannot be locked to allow for drilling. But that would be sweet!
I believe there are some Mazaks that have that option but I have yet to see one or hear from anyone who has used one. Apparently besides drilling you can hone as well!