Owning a vintage slot machine is one of those fun yet daunting ideas. Many old school one-armed bandits are beautifully designed and instant conversation pieces. Plus slot fans who own a machine don’t ever have to worry about losing money to the house.

The 20th Century coin-operated Slot Machine by Mills Novelty Co. (circa 1900), and it's history and background, photos, repair help, manuals, for sale and wanted lists, and census survey is brought to you by The International Arcade Museum at the Museum of the Game.

Charles August Fey, a Bavaria-born inventor, was living in San Francisco when he invented his first gambling machine in 1984. His games grew to be so popular at local bars, he quit his day job and opened a factory to start mass producing them, most notably the Liberty Bell machines in 1899. A lot of the functionality from that early game remained in place through much of the 20th century. Watch this video to see the seven mechanical actions set into motion when you pull back the bandit’s arm. The inner workings are probably a little more complex than you expect.

Given that a lot of old slot machines are hand built, it isn’t surprising that coins can get jammed on their way through the mechanism. Big warning: If your machine jams, don’t force the arm or you can break, twist or damage a part inside. Different models and makes tend to have common jam points. The Mills model shown in the above video can have coins stuck in the “elevator” section that displays the last five coins dropped into the machine. Getting the slot working again can be as simple as cleaning the gunk off of an old part. You just need to be smart when you’re disassembling and reassembling the machinery.

Okay, there are plenty of more places where a coin can get stuck and the above video demonstrates how to fix a variety of jams. It also explains how to disassemble the major parts of the machine and where common problem areas are.

Curious how an antique slot machine knows how much money a winner gets? This video shows the punch-card like communication that trips payouts and how. If you ever need to replace the reel symbols or calibrate the machine you’ll need to understand how these work. Even if you don’t ever plan on owning a machine, the metallic “circuitry” is interesting to see.

Want to own a modern slot machine? New ones have plenty more bells, whistles and dings, and also a lot more advanced parts. If you plan on getting one, you may want to have an idea of what’s inside. In addition to the classic reels, there are speakers, motherboards filled with programming chips and plenty of wires. Unless you have a way with a soldering iron you probably won’t try and fix it. But in case you do, here’s a clip from Discovery showing what’s inside.

Did you know newer slot machines are smart enough to test themselves when a problem happens? This video shows you the procedure for having the machine check its own system. The host’s desert dry delivery is also enough to make this vid worth a watch.

• Cutting tools
  • Tool materials
• Basic machine tools
• Modifications of basic machines
• Special-purpose machines
• Automatic control
• Computer-aided machining
  • Computer numerical control (CNC)
• Nonconventional methods of machining
  • Electrical methods of machining
  • Other methods of machining

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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. The fourth category covers modern machine tools and processes for machining ultrahard metals not machinable by older methods.

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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. The cold forming of metal parts, such as cooking utensils, automobile bodies, and similar items, is done on punch presses, while the hot forming of white-hot blanks into appropriately shaped dies is done on forging presses.

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). Because of the precise dimensional requirements of the parts and the heavy cutting forces exerted on the cutting tool, machine tools combine weight and rigidity with delicate accuracy.

History

Before the Industrial Revolution of the 18th century, hand tools were used to cut and shape materials for the production of goods such as cooking utensils, wagons, ships, furniture, and other products. 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.

The earliest steam engines suffered from the imprecision of early machine tools, and the large cast cylinders of the engines often were bored inaccurately by machines powered by waterwheels and originally designed to bore cannon. Within 50 years of the first steam engines, the basic machine tools, with all the fundamental features required for machining heavy metal parts, were designed and developed. Some of them were adaptations of earlier woodworking machines; the metal lathe derived from woodcutting lathes used in France as early as the 16th century. In 1775 John Wilkinson of England built a precision machine for boring engine cylinders. In 1797 Henry Maudslay, also of England and one of the great inventive geniuses of his day, designed and built a screw-cutting engine lathe. The outstanding feature of Maudslay’s lathe was a lead screw for driving the carriage. Geared to the spindle of the lathe, the lead screw advanced the tool at a constant rate of speed and guaranteed accurate screw threads. By 1800 Maudslay had equipped his lathe with 28 change gears that cut threads of various pitches by controlling the ratio of the lead-screw speed to the spindle speed.

The shaper was invented by James Nasmyth, who had worked in Henry Maudslay’s shop in London. In Nasmyth’s machine, a workpiece could be clamped horizontally to a table and worked by a cutter using a reciprocating motion to plane small surfaces, cut keyways, or machine other straight-line surfaces. A few years later, in 1839, Nasmyth invented the steam hammer for forging heavy pieces. Another disciple of Maudslay, Joseph Whitworth, invented or improved a great number of machine tools and came to dominate the field; at the International Exhibition of 1862, his firm’s exhibits took up a quarter of all the space devoted to machine tools.

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Britain tried to keep its lead in machine-tool development by prohibiting exports, but the attempt was foredoomed by industrial development elsewhere. British tools were exported to continental Europe and to the United States despite the prohibition, and new tools were developed outside Britain. Notable among these was the milling machine invented by Eli Whitney, produced in the United States in 1818, and used by Simeon North to manufacture firearms. The first fully universal milling machine was built in 1862 by J.R. Brown of the United States and was used to cut helical flutes in twist drills. The turret lathe, also developed in the United States in the middle of the 19th century, was fully automatic in some operations, such as making screws, and it presaged the momentous developments of the 20th century. Various gear-cutting machines reached their full development in 1896 when F.W. Fellows, an American, designed a gear shaper that could rapidly turn out almost any type of gear.

The production of artificial abrasives in the late 19th century opened up a new field of machine tools, that of grinding machines. C.H. Norton of Massachusetts dramatically illustrated the potential of the grinding machine by making one that could grind an automobile crankshaft in 15 minutes, a process that previously had required five hours.

By the end of the 19th century a complete revolution had taken place in the working and shaping of metals that created the basis for mass production and an industrialized society. The 20th century has witnessed the introduction of numerous refinements of machine tools, such as multiple-point cutters for milling machines, the development of automated operations governed by electronic and fluid-control systems, and nonconventional techniques, such as electrochemical and ultrasonic machining. Yet even today the basic machine tools remain largely the legacy of the 19th century.

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Machine-tool characteristics

All machine tools must provide work-holding and tool-holding devices and means for accurately controlling the depth of the cut. The relative motion between the cutting edge of the tool and the work is called the cutting speed; the speed in which uncut material is brought into contact with the tool is called the feed motion. Means must be provided for varying both.

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Because an overheated tool may lose its cutting ability, temperatures must be controlled. The amount of heat that is generated depends on the shearing force and the cutting speed. Because the shearing force varies with the material being cut and the tool material varies in its tolerance for high temperatures, the optimum cutting speed depends both on the material being cut and the cutting-tool material. It is also influenced by the rigidity of the machine, the shape of the workpiece, and the depth of the cut.

Slot Machines In Early 20th Century Artists

Cutting tools

Metal-cutting tools are classified as single point or multiple point. A single-point cutting tool can be used for increasing the size of holes, or boring. Turning and boring are performed on lathes and boring mills. Multiple-point cutting tools have two or more cutting edges and include milling cutters, drills, and broaches.

There are two types of operation; either the tool is moving on a straight path against the stationary workpiece, as on a shaper, or the workpiece is moving against the stationary tool, as on a planer. Relief or clearance angles must be provided to prevent the tool surface below the cutting edge from rubbing against the workpiece. Rake angles are often provided on cutting tools to cause a wedging action in the formation of chips and to reduce friction and heat.

Early 20th Century Poetry

Early 20th Century History