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Dressing and Truing 230

Abrasives Training

Class Information

Tooling U classes are offered at the beginner, intermediate, and advanced levels. The typical class consists of 12 to 25 lessons and typically requires at least two hours of instruction time.

Class Name:	Dressing and Truing 230
Description:	This class describes the common methods used to balance, true, and dress a standard grinding wheel.
Prerequisites:	250110
Difficulty:	Intermediate
Number of Lessons:	16

Class Outline
Objectives Grinding Wheel Preparation Detecting Cracks Grinding Wheel Mounting Wheel Balance Detecting Wheel Imbalance Factory Balancing Balancing Methods Wheel Truing Diamond Dressers Truing Process Dressing Simultaneous Truing and Dressing Dressing and Truing Tools Pros and Cons of Stationary and Rotary Tools Summary

Class Objectives

Name the steps required for grinding wheel preparation.
Indicate the spots on the wheel that may be tapped during a ring test.
Identify common grinding wheel mounting components.
Explain the importance of wheel balancing.
Identify proper wheel balance.
Describe how grinding wheel manufacturers ensure that grinding wheels remain balanced.
Describe various balancing methods.
Distinguish between truing and dressing.
Name the tool that is most frequently used to true a wheel.
Identify the correct positioning of a diamond dresser during truing.
Describe the main purpose of wheel dressing.
Understand how dressing and truing can be performed simultaneously.
Name the two types of dressing tools.
Distinguish between the advantages of stationary and rotary dressers.
Describe proper methods for maintaining accuracy during the truing process.

Class Vocabulary
automated system	Any system that does not require human intervention. An automated dresser would be part of the machine setup and would require little in-process attention.
automatic balancer	A device that uses one of several methods, including gasses and fluids, to detect vibration.
balancing	The process of making a wheel round or concentric. Balancing may be accomplished through several methods, including truing with a diamond dresser.
balancing stand	A frame-like device on which a grinding wheel is placed to check for balance. The grinding wheel is first mounted on a mandrel.
blotter	A paper ring that helps buffer mounting pressures between the wheel and the flange.
chatter mark	An irregular mark left on a workpiece that has been ground with a wheel that is out of true.
concentric	Similarity between two circles, both having a common center, such as the center hole on a grinding wheel and its outside edge.
crush roll	A hard grinding wheel used under pressure to improve the face of another grinding wheel and usually to add a special shape.
diamond disc	A type of grinding wheel with diamonds projecting from its periphery. Used for wheel dressing.
diamond dresser	A tool containing one or more diamonds used to remove material from the surface of a grinding wheel.
dressing	The removal of swarf, dull grains, and bonding material from a grinding wheel. Dressing sharpens the wheel.
dynamic balance	The ability of a grinding wheel to come to rest only when it loses momentum. The wheel is mounted on a mandrel and rolled along a balancing stand.
flange	A flat or raised metal disk that helps deflect mounting stresses from the wheel's hole.
glazing	The unwanted formation of a smooth surface on a grinding wheel. Glazing occurs when the heat from grinding reacts with a loaded wheel.
lock nut	A type of nut that screws down on top of another nut to hold the first one in place. The lock nut is usually thinner than the nut it is holding.
magnetic chuck	The moveable surface on a grinding machine that holds the workpiece or dresser in place.
mandrel	The spindle or post on which a wheel is mounted.
mounting	The attaching of the wheel to the grinding machine. Often involves placing the wheel on a spindle.
profile	A specialized edge that is added to the face of a wheel to help it conform to a particular grinding operation or part shape.
ring test	A manual test used to detect damage in bonded grinding wheels. Operators suspend a wheel loosely and tap it with a tool. Wheels that emit a ringing sound are likely undamaged.
rotary dresser	A dressing tool that turns as it dresses, such as a wheel with diamond abrasive.
self-dressing	A method of wheel dressing that uses increased pressure or feed to force material from the face of a grinding wheel while it is in use.
shaping	The changing of the profile of a grinding wheel.
single-point diamond	In grinding, it is one industrial-grade diamond embedded in the end of a wheel-dressing tool.
sleeve	A type of flange that fits together with two differently shaped parts and a lock nut.
static balance	The ability of a grinding wheel to remain at rest in any position when placed on a balancing stand.
stationary dresser	A dressing tool that has a point or points that are fixed. A single-point diamond is the best example of a stationary dresser.
swarf	The gritty combination of chips, abrasive grains, and worn bonding material that is produced during grinding.
truing	The dressing of a wheel in order to return the wheel to its original shape. Truing is also a method of wheel balancing.
wheel balance	A wheel that has equal weight and shape throughout, making it completely concentric. A balanced wheel does not vibrate.