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Thread: Live center in live tailstock?
12-01-2011, 11:21 AM #1
Live center in live tailstock?
Does anybody have any thoughts on using a live center in a tailstock that has a bearing? Good? Bad? No big deal?
Lathe came with a dead center in the tailstock.
Thanks for your thoughts.
12-01-2011, 11:27 AM #2
?????Sorry you've lost me there, more info or possibly a sketch / pic would help.
i_r_machinist liked this post
12-01-2011, 11:47 AM #3
Glad I'm not the only one who doesn't follow that. A live center has bearings, but I've never seen or heard of a tailstock with with bearings.
12-01-2011, 11:47 AM #4I've never seen or heard of a tailstock with with bearings.
as far as putting a live center in a live tailstock
i seen it done many times to bypass a locked up live tail stock bearing
not sure why else you would do it
12-01-2011, 11:55 AM #5
So the tailstock quill rotates???
Hmm....learn something new every day...
12-01-2011, 12:11 PM #6
Can the tailstock quill be locked to allow drilling?
12-01-2011, 12:37 PM #7
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
12-01-2011, 01:03 PM #8
12-01-2011, 01:11 PM #9
I have a big one like that - and the big bearings would git hot. This one has interchangeble heads on it. No MT at all.
I removed the cartridge and made a plug with a taper in it and stuffed a smaller (#5 MT) center in it. Works better for smaller D / higher speed apps IMO.
Think Snow Eh!
12-01-2011, 01:22 PM #10
Lodge and Shipley lathes
Lodge and Shipley long bed lathes used to have roller bearing morse
sleeves built into the tail stock to take either a dead center, or drill.
These spindle centers had real heavy duty bearings.
There was a keyed locking collar that fit over the tail stock spindle
with a slotted hole to lock the sleeve which had flats.
Live centers introduce a lot of overhang for large heavy shafting
leading to chatter and other problems.
A live center failure will real quick lead to a catastrophic
If both sets of bearings are good the effects will be minimal.
Two poor bearings rotating at random will induce various finish problems.