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by Marshall Brain

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Brain, Marshall.  "How Gear Ratios Work"  20 November 2000.  HowStuffWorks.com. <http://science.howstuffworks.com/transport/engines-equipment/gear-ratio.htm>  11 February 2012.
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Josh &amp; Chuck explore zombies, mirror neurons and more »
Josh & Chuck explore zombies, mirror neurons and more »
Inside this Article
  1. Introduction to How Gear Ratios Work
  2. Putting Gears to Work
  3. Understanding the Concept of Gear Ratio
  1. Gear Trains
  2. Other Uses for Gears
  3. An Example
  4. See more »
    1. Lots More Information
    2. See all Engines & Equipment articles

Lots More Information

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Inside this Article
  1. Introduction to How Gear Ratios Work
  2. Putting Gears to Work
  3. Understanding the Concept of Gear Ratio
  4. Gear Trains
  1. Other Uses for Gears
  2. An Example
  3. Lots More Information
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Prices: Gear Motors

  • Jancy 4x4 Portable Magnetic-Base Drill, 120V, 11.7 Amp Motor, 4&quot; Diameter x 3&quot; Depth Capacity
    Jancy 4x4 Portable Magnetic-Base Drill, 120V, 11.7 Amp Motor, 4" Diameter x 3" Depth Capacity

    The Jancy 4x4 120V, 11.7 amp portable magnetic-base drill press has a four-speed gear box that can be set to 100, 150, 200, or 310 RPMs. It has a 4” maximum cutting diameter, a 3” maximum cutting depth, an external coolant chamber that delivers coolant through the arbor, and an electromagnet with a dead lift of 4833 lb. and a drill point breakaway of 1934 lb. on 1” thick steel when drilling holes 1-1/16” diameter and larger. Safety features prevent the drill from turning on if the magnetic field is not strong enough to hold the drill, turn on a warning light when the magnetic field drops to an unsafe level or when the feed is too fast, and turn the motor off if the press breaks free from the surface to which it is attached. A safety strap is designed to prevent the drill from falling if power to the magnet is interrupted, and a chip guard controls chips. For customization, a 3-spoke handle can be mounted on either side of the press. The drill press accommodates annular cutters with a 3/4" shank, and can be converted to accommodate a 1-1/4” twist drill (all sold separately). The Jancy 4x4 120V portable magnetic-base drill has a 1.8 horsepower (HP) 1400 watt single-phase motor. The drill is 31-1/2 x 9-1/2 x 16 inches (H x W x D) and it weighs 73 lb. (H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.) Magnetic drill presses are used in steel fabrication industries to drill holes in steel where it is necessary to move the drill to the workpiece, such as ship and bridge building. They are portable and have a magnetic base that secures the drill to the steel workpiece, allowing the drill to be mounted vertically, from either the top or bottom of the workpiece, or horizontally on the side of the workpiece. They are usually used with annular cutters, though some can be converted to hold a chuck with drill bits or with threading taps. Magnetic drill presses are given two numbers that signify the strength of the magnetic field. Magnet deadlift signifies the amount of force it takes to lift the drill off 1” thick steel when the magnet is turned on. Drill point breakaway is the amount of force it takes the drill bit to push the drill off 1” thick steel when the drill is in operation. Generally, higher numbers indicate that the press can exert more force on the workpiece. Jancy Engineering manufactures Slugger portable magnetic drills and annular cutters, as well as metal working equipment for the fabrication trade. The company, founded in 1957 and headquartered in Davenport, IA, makes tools that meet American National Standards Institute (ANSI) standards. What’s in the Box? Jancy 4x4 120V magnetic drill press Carrying Case Safety strap Knob and spoke handle Hex keys: 2.5, 4, 5, 6, and 10 mm 5 mm T-handle hex key 8 mm combination wrench Knock-out wedge Coolant bottle assembly Instructional DVD Instructions

    $1882.23

  • Jancy 4x4 Portable Magnetic-Base Drill, 240V, 5.8 Amp Motor, 4&quot; Diameter x 3&quot; Depth Capacity
    Jancy 4x4 Portable Magnetic-Base Drill, 240V, 5.8 Amp Motor, 4" Diameter x 3" Depth Capacity

    The Jancy 4x4 240V, 5.8 amp portable magnetic-base drill press has a four-speed gear box that can be set to 100, 150, 200, or 310 RPMs. It has a 4” maximum cutting diameter, a 3” maximum cutting depth, an external coolant chamber that delivers coolant through the arbor, and an electromagnet with a dead lift of 4833 lb. and a drill point breakaway of 1934 lb. on 1” thick steel when drilling holes 1-1/16” diameter and larger. Safety features prevent the drill from turning on if the magnetic field is not strong enough to hold the drill, turn on a warning light when the magnetic field drops to an unsafe level or when the feed is too fast, and turns the motor off if the press breaks free from the surface to which it is attached. A safety strap is designed to prevent the drill from falling when power to the magnet is interrupted, and a chip guard controls chips. For customization, a 3-spoke handle can be mounted on either side of the press. The drill press accommodates annular cutters with a 3/4" shank, and can be converted to accommodate a 1-1/4” twist drill (all sold separately). The Jancy 4x4 240V portable magnetic-base drill has a 1.8 horsepower (HP) 1400 watt single-phase motor. The drill is 31-1/2 x 9-1/2 x 16 inches (H x W x D) and it weighs 73 lb. (H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.) Magnetic drill presses are used in steel fabrication industries to drill holes in steel where it is necessary to move the drill to the workpiece, such as ship and bridge building. They are portable and have a magnetic base that secures the drill to the steel workpiece, allowing the drill to be mounted vertically, from either the top or bottom of the workpiece, or horizontally on the side of the workpiece. They are usually used with annular cutters, though some can be converted to hold a chuck with drill bits or with threading taps. Magnetic drill presses are given two numbers that signify the strength of the magnetic field. Magnet deadlift signifies the amount of force it takes to lift the drill off 1” thick steel when the magnet is turned on. Drill point breakaway is the amount of force it takes the drill bit to push the drill off 1” thick steel when the drill is in operation. Generally, higher numbers indicate that the press can exert more force on the workpiece. Jancy Engineering manufactures Slugger portable magnetic drills and annular cutters, as well as metal working equipment for the fabrication trade. The company, founded in 1957 and headquartered in Davenport, IA, makes tools that meet American National Standards Institute (ANSI) standards. What’s in the Box? Jancy 4x4 240V magnetic drill press Carrying Case Safety strap Knob and spoke handle Hex keys: 2.5, 4, 5, 6, and 10 mm 5 mm T-handle hex key 8 mm combination wrench Knock-out wedge Coolant bottle assembly Instructional DVD Instructions

    $2041.03

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