How to tell what MT tailstock taper is?

If you had a largish lathe (18"x72") but didnt know the MT # of the tailstock, how would you go about figuring out what it is? I need to get a
new live center, want to get the right MT.
Thanks for any info.
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Table on page 906 of Machinery Handbook has the specs. If you don't have this, give us the diameter at the small end of the taper, diameter at large end, and distance between the two diameters.
Karl

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wrote:

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXx
Hey Greg,
Scott Logan has some good stuff at
<http://loganact.com
and in particular
<http://loganact.com/tips/ or closer at <http://loganact.com/tips/tapers.htm
The following is an excerpt from that last site
Taper Name        Large    Taper/    Taper/    Angle    Small    Length             End    Foot    Inch    From    End                         Center ----------------------------------------------------------------------- #0 Morse        0.3561    .6246    .0521    1.4908    0.2520    2.00 #1 Morse        0.4750    .5986    .0499    1.4287    0.3690    2.13 #2 Morse        0.7000    .5994    .0500    1.4307    0.5720    2.56 #3 Morse        0.9380    .6024    .0502    1.4377    0.7780    3.19 #4 Morse        1.2310    .6233    .0519    1.4876    1.0200    4.06 #4-1/2 Morse        1.5000    .6240    .0520    1.4894    1.2660    4.50 #5 Morse        1.7480    .6315    .0526    1.5073    1.4750    5.19 #6 Morse        2.4940    .6257    .0521    1.4933    2.1160    7.25 #7 Morse        3.2700    .6240    .0520    1.4894    2.7500    10.00 -----------------------------------------------------------------------
I would measure just the diameter of the visible opening of the tailstock quill, and pick the closest one form the column "Large End".
18" lathe is at least a MT-4, and probably an MT-5
Take care.
Brian Lawson, Bothwell, Ontario.
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Its a #4 of course. Steve

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