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Gear ratio of longitudinal power feed
Power feed along the length of the bed as a fraction of thread pitch, often about one third. (Longitudinal feed, sometimes known as sliding).
Gear ratio of cross-slide power feed
Cross-slide power feed as a fraction of thread pitch
(Used for 'facing' or 'surfacing'. Usually about 0.1)
Changeable Stud Gear or Spindle Gear?
Can the stud or spindle gear be removed and changed? Some Asian lathes have the stud gear machined as part of the spindle shaft, so that it cannot be changed. This is the first gear in the gear train.
The first gear in the train, or "stud gear", CAN be changed.
It is assumed that the plain change gears are used here. South Bend clones such as the Boxford A, B, C use this system.
The first gear in the train cannot be changed. Enter the number of teeth below:
How many teeth are on the first gear in the train ?
Boxford and most other lathes allow you to change it. Often Chinese mini-lathes do not allow it to be changed and do not mention it in their gear charts. Most mini-lathes have 40 teeth machined into the spindle. If it cannot be changed, enter the size of the first gear in the chain here. This may be the stud gear or a gear machined into the spindle shaft (which has the chuck mounted on the other end).
Changeable gear on the leadscrew or gearbox?
Can the leadscrew gear be removed and changed?
On some lathes the last gear in the train cannot be changed. This gear is mounted on the lead screw or gearbox input and is referred to as the "Leadscrew Gear (LSG). It is assumed that the plain change gears are used. They can be changed on South Bend clones such as Boxford lathes.
The leadscrew gear, CAN be changed.
eg South Bend / Boxford and most other lathes allow you to change it
The leadscrew gear CANNOT be changed.
How many teeth are on the leadscrew gear?
Only required if the gear is not changeable.
Change the lead-screw pitch or TPI
Enter leadscrew pitch in mm or TPI.
The leadscrew pitch has been set as part of the lathe specifications eg South Bend 9" clone metric lathes have a 3mm leadscrew, while imperial lathes have 8 Threads Per Inch, unless changed here.
Does the lathe have a lead-screw gearbox for cutting threads?
Yes, it has a gearbox
No gearbox fitted
Is the lead-screw imperial or metric?
If the lead-screw is metric the lathe is defined as a metric lathe.
Metric Lead-screw (mm pitch)
Imperial Lead-screw (TPI)
Primary Ratio of the gearbox
Alter the primary ratio
If your gearbox is similar to one of the gearboxes provided in the list, but the standard gears are different you can adjust the primary ratio of the gearbox here.
Click the help button (?) and then 'Return...' for a detailed explanation.
Enter a Fudge Factor
This is normally blank. A few rare and unusual lathes may need to have the calculated pitch or TPI adjusted by multiplying the primary ratio by a 'Fudge Factor'.
Click the help button (?) for a detailed explanation.