Grinding Processes 120

This class identifies the major types of grinding operations and explains how they are performed on the machine. Includes an Interactive Lab.

Class Details

Class Name:
Grinding Processes 120
This class identifies the major types of grinding operations and explains how they are performed on the machine. Includes an Interactive Lab.
Number of Lessons:
Additional Language:
Spanish, Chinese
Related 2.0 Class:
Grinding Processes 201

Class Outline

  • Objectives
  • The Importance of Grinding
  • Grinding Machine Characteristics
  • Surface Grinding
  • Center-Type Cylindrical Grinding
  • Chucking-Type Cylindrical Grinding
  • Centerless Grinding
  • Internal Centerless Grinding
  • Creep Feed Grinding
  • Snagging and Offhand Grinding
  • Tool Grinding
  • Cutoff Operations
  • Summary


  • Describe the benefits of grinding.
  • Name some characteristics of grinding machines.
  • Describe surface grinding.
  • Describe center-type cylindrical grinding.
  • Describe chucking-type cylindrical grinding.
  • Describe centerless grinding.
  • Describe internal centerless grinding.
  • Describe creep feed grinding.
  • Identify common methods of imprecise grinding.
  • Describe tool grinding.
  • Describe cutoff grinding.



Vocabulary Term Definition
center A hardened, pointed, cylindrical component used to hold the end of a workpiece by inserting its tip into a matching hole in the part. Centers are generally used in pairs.
centerless grinding A type of grinding in which cylindrical parts are not held between centers but are supported on a work rest blade and rotated.
center-type cylindrical grinding A type of cylindrical grinding in which each end of the workpiece is mounted on a pointed bar, or center. It is similar to a lathe.
chuck A device that holds a workpiece in place as it rotates. The chuck commonly has three or four jaws that can be adjusted to fit various sizes.
chucking-type cylindrical grinding A form of cylindrical grinding that uses a workholding device to hold and steady the work at one end.
coated abrasive belt A grinding tool in the form of a loop of fabric or other material that has been layered with adhesives and abrasive grains.
collet A slitted device that holds a workpiece in place as it rotates. A collet has a hole through which the workpiece passes, and it is designed to hold specific dimensions.
computer numerical control A type of programmable automation, directed by mathematical data, which uses microcomputers to carry out various machining operations. Usually referred to as CNC, the computer controls the steps in an operation.
concentricity The degree to which a given dimension resembles a perfectly round circle or cylinder.
creep feed grinding A grinding method in which the depth of cut is increased while the feed rate is decreased compared with normal grinding practices. It is used for large amounts of material removal.
cutoff To separate a workpiece into two or more parts.
cutting tool A device with one or more edges used to create chips and remove metal. Cutting tools are either single point or multi-point tools.
cylindrical grinding A grinding process used to make cylindrical parts concentric. It is generally used on long, cylindrical bars and is similar to a lathe.
depth of cut In grinding, it is how far into the workpiece a grinding wheel plunges.
feed The rate at which the grinding wheel and the workpiece move in relation to one another.
formed grinding wheel An abrasive wheel with a distinct profile that is used to grind shapes or contours into a workpiece.
grade In grinding, it is the way in which the hardness of the bond in an abrasive wheel is classified.
grinding The use of an abrasive to wear away at the surface of a workpiece and change its shape.
grinding machine A mechanical device that rotates an abrasive wheel. Grinding machines are available in a variety of arrangements.
internal centerless grinding A form of centerless grinding in which the grinding wheel contacts and grinds the internal surface of the work. It uses two support rolls and a drive wheel.
milling A machining operation that uses a multi-point horizontal or vertical cutter to remove metal from the surface of a workpiece.
offhand grinding A form of rough grinding used to remove excess material without regard to surface finish. The workpiece is generally held in the operator's hand and placed against a moving abrasive tool.
reciprocate To move back and forth repeatedly.
regulating wheel A wheel, usually made of plastic or rubber bond, used during centerless grinding to rotate the workpiece and pull it through the operation.
snagging A form of rough grinding used to remove excess material without regard to surface finish.
spindle A rotating component of a machine tool. Grinding wheels are typically mounted in a spindle.
stock The raw material that most shops use to construct workpieces. It may come in the form of bars, sheets, rolls, and other shapes.
straight wheel A common type of abrasive tool used in grinding and cutoff operations. Straight wheels generally appear as flat disks.
support roll A component used in internal centerless grinding to position and hold the workpiece against the regulating wheel.
surface grinding A method of grinding generally used on flat surfaces that feeds a workpiece beneath a rotating grinding wheel.
surface grinding machine A machine that grinds material by feeding a workpiece beneath a rotating grinding wheel. It is generally used on flat surfaces.
swarf The gritty combination of chips, abrasive grains, and worn bonding material that is produced during grinding.
table The surface on which the workpiece rests during grinding.
through feed In grinding, it is the movement of a workpiece as it travels through an operation.
tolerance The unwanted but acceptable deviation from the desired dimension.
tool grinding A common grinding method of reshaping and sharpening shop tools.
tool steel A type of steel designed with wear resistance, toughness, and high strength. Tool steels are typically high-carbon steels.
universal tool and cutter grinder A specialized grinding machine used to sharpen and reshape cutting tools. Both the grinding wheel and the workholder may be positioned in multiple ways for efficient sharpening of oddly shaped tools.
welding The joining together of two or more pieces of metal by application of heat.
work rest blade A device, usually with an angled edge, that supports cylindrical parts during centerless grinding.
workholding device A device used to support, locate, and hold a workpiece. The workholder references the tool performing the operation on the part being held.