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Given a passage and a query based on the passage, generate an unambiguous, concise and simple answer to the query from information in the passage. Note that the answer may not be present in exact form.

Cell machines have large tool magazines to carry enough tools to do all of the various operations on each of the different parts, large worktables or the ability to change worktables, and special provisions in the controller for data inputs from other CNC machines. Attached to the side of the machine is a magazine of different tools. A transfer arm, sometimes called the tool bar, removes a tool from the machine, places it into the magazine, selects a different tool from the magazine, and returns it to the machine through instructions in the program. The fourth category covers modern machine tools and processes for machining ultrahard metals not machinable by older methods. 1 Machine tools that form parts by removing metal chips from a workpiece include lathes, shapers and planers, drilling machines, milling machines, grinders, and power saws. Modern machine tools cut or form parts to tolerances of plus or minus one ten-thousandth of an inch (0.0025 millimetre). In special applications, precision lapping machines can produce parts that are within plus or minus two millionths of an inch (0.00005 millimetre). The motions that are used in machine tools are called axis, and are referred to as X (usually left to right), Y (usually front to back), and Z (up and down). The work-table may also be rotated in the horizontal or vertical plane, creating a fourth axis of motion. After the advent of the steam engine, material goods were produced by power-driven machines that could only be manufactured by machine tools. Machine tools (capable of producing dimensionally accurate parts in large quantities) and jigs and fixtures (for holding the work and guiding the tool) were the indispensable innovations that made mass production and interchangeable parts realities in the 19th century. Machine tool: Machine tool, any stationary power-driven machine that is used to shape or form parts made of metal or other materials. The shaping is accomplished in four general ways: (1) by cutting excess material in the form of chips from the part; (2) by shearing the material; (3) by squeezing metallic parts to the desired shape; and (4) by applying electricity, ultrasound, or corrosive chemicals to the material. Welding the base. 1 1 The base of the machine is either cast or welded together. It is then heat treated to remove casting or welding stresses and to normalize the metal for machining. 2 2 The ways are ground flat, bolted, and pinned to the base. The controller. 1 5 The computer, or controller, is an electronic assembly separate from the rest of the machine. It has a climate-controlled enclosure mounted on the side of the frame or in an operator's console. 2 6 The assembled machine is test run for accuracy. In particular, machine-driven tools became necessary to manufacture the parts for the machines that now made goods formerly produced by hand. Most common machine tools were designed by the middle of the 19th century. Query: how is made machine tools
Output:
Machine tools that form parts by removing metal chips from a workpiece include lathes, shapers and planers, drilling machines, milling machines, grinders, and power saws.