Types of Feed Gearboxes a. Feed gearbox with sleep gears : One of its advantages is the small axial dimension. It is possible to design for a large number of feed rates, if kept within the limits of the upper and the lower transmission ratios. Such gearboxes are used, where feed changes are less frequent. The machines are automatic, semi automatic, special purpose and single purpose machine tools. b. Feed gearbox with slip gear quadrants : Slip gear fitted to shaft having fixed center distance does not give very accurate output speed. It here have a large number of very finely stepped spindle speeds is required and the actual speeds are to be very accurate. The arrangement of the slip gear is changed. Between the fixed axes of the driving shaft and the driven shaft is placed on a carrier. The intermediate shaft can be adjusted by its linear displacement along the slot in the quardant by swiveling it round axis.
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