If you would like to try an alternative to the LMS gear train program, you could try my program called RideTheGearTrain.com. You would choose a lathe without a gearbox and leadscrew 16 TPI. Choose a gear train setup with one compound gear (this will include your 63 tooth gear). Choose automatic compound gears. Enter your own list of change gears including your 63 tooth gear. Enter the pitch/TPI of the thread you want to cut. It will list all the possible gear combinations that produce the thread you wanted.
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Evan
Lathe: 1955 Boxford Model A with screw cutting gearbox, power feed with several accessories, hand tools and a pillar drill press.
Try my Free Online Gear train Software:
You enter a thread pitch or TPI and it shows you a range of gear trains and gearbox setting to use and even a scale drawing of the gear train.
It also includes calculations for taper turning by the tailstock offset method, and cutting speeds.
It includes the specifications for many thread types eg metric, UNC, BSW, and BA.
Displays drill sizes for tapping threads at any percent thread depth (with full explanations).
My YouTube Channel and Playlist about using an engineers lathe: ?
Project to build a Greek Hero steam engine and measure its power output:?
Evan