The Flat Turret Lathe, like all other lathes, consists of the three important parts: (1) The head stock, having the work-holding spindle, the pulley for receiving the power for driving spindle and the necessary intermediate gears for obtaining requisite reduction and variations of speed of spindle; (2) the tool-holding carriage; and (3) a frame or bed with guideways for carriage.
It differs from all other lathes and turret lathes in the construction of these parts as follows:
First - The head stock is mounted on guideways running across the machine instead of being affixed to the bed. It contains the necessary gears and clutches for producing all the changes of speed.
Second - The carriage carries a flat circular plate-shaped tool holder, from which the lathe takes its name of Flat Turret.
Third - The frame or bed is one single casting formed with guideways which run lengthwise for the carriage and crosswise for the head stock. The lower part of the bed casting serves as a receptacle for chips and oil.
The reasons for departing from the well-established form of lathe have been set forth in the chapter on Evolution. The advantages will be readily understood after glancing at the following pages, which show the working range and details of construction, the whole combination resulting in a machine that is always in absolute readiness any hour of any day to make any piece of work of any shape quickly and accurately and to turn out work in lots of from two or three to a thousand pieces of a kind with turret lathe speed and accuracy of a well-handled engine lathe.
Turret lathe efficiency and engine lathe accuracy are our best terms, but to one who has carefully considered this subject these terms are unsatisfactory.
Front View of the 2 x 24-inch Hartness Flat Turret Lathe with Cross Sliding Head, Equipped for Bar Work
The Hartness Flat Turret Lathe with cross sliding head is made in two sizes, and may be furnished with an equipment of tools for either bar work or chuck work, or a double equipment for both bar and chuck work.
The smaller machine (above shown) is called the 2 x 24, and when equipped with the automatic die outfit of tools it turns out the same work as the original 2 x 24, excepting that the hole through the spindle is now made 2 3/8 inches instead of 2 1/8 inches. For various details of working range and outfit for bar work, see pages 84 to 93.
Itemized outfit, pages 190 to 193.
This machine, equipped for chuck work, is described on pages 88 to 93. See also pages 132 to 189.
The machine may be ordered with either the chucking or bar outfit, and supplied later with the other outfit, if for any reason the machine should be changed from bar to chuck work, or vice versa. Since the chucking outfit is comparatively inexpensive, it is frequently ordered with the bar outfit of one or more machines of a lot, so that at least one machine may be used on short notice for chuck work.
Front of 3 x 36-inch Flat Turret Lathe with Cross Sliding Head, Equipped for Bar Work
The machine shown above, and on opposite page, is the 3 x 36-inch size. It is shown in these three views arranged to handle full bars of stock up to 3 inches in diameter, turning pieces up to 36 inches in length of the class of work shown on the following pages. It may also be equipped for chuck work up to 14 inches in diameter, and is illustrated and described as a chucking machine on pages 132 to 189.
Itemized outfits on pages 194 to 197.
This machine may be ordered with either the chucking or bar-working outfit of tools, and supplied later with the other outfit. Since the chucking outfit is comparatively inexpensive it should be ordered with the bar.
Rack of 3 x 36-inch Flat Turret Lathe with Cross Sliding Head, Equipped for Bar Work 3 x 36-inch Lathe with Motor Drive. It may be driven from countershaft overhead if desired