gears may be used, the knurled knob on the front face of the gear is pushed away from the operator; this automatically withdraws the locking pin by means of a cam slant cut in the face of the plate gear; to re-engage for direct drive the knob is pulled towards the operator , when a spring action automatically returns the locking pin. This lock has thus the simplist motion possible, requiring the least time and trouble in its operation; no nuts, screws, spanners or pull-out pins are employed, and in the somewhat restricted space available it forms a very accessable and convenient arrangement. Just a push of the knob, forwards or backwards, and the cone is freed or locked.
The back gears work on an eccentric bearing spindle, and cast iron gears guards are fitted. The whole headstock is of massive design and of great length for the size of lathe.
The mandrel nose is provided with a square ground shoulder as register behind the thread; this ensures perfect running truth of face plate or chuck.
METHOD OF ADJUSTMENT OF BEARINGS
(See Fig.4).
The method of adjustment of the main bearings will show just how these are constructed. |
