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Surface Grinder Operation 240

Abrasives Department

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	Surface Grinder Operation 240
Description	This class discusses the steps involved in grinding horizontal and vertical surfaces with a horizontal-spindle, reciprocating-table grinding machine.
Prerequisites	250110 250120
Difficulty	Intermediate
Number of Lessons	17

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Class Outline

Class Objectives

Objectives

Horizontal-Spindle, Reciprocating Table Surface Grinding

Components of the Machine

Workholding Components

Workholding Accessories

Mounting the Workpiece

Settings and Roughing

Grinding Flat Surfaces

Grinding Parallel Sides

Finishing Parallel Sides

Grinding Edges

Mounting the Workpiece on a Fixture

Grinding the Edges of a Workpiece

Squaring the Fifth and Sixth Edges

Mounting the Workpiece for Vertical Grinding

Grinding a Vertical Surface

Summary

Describe grinding on a HSRT surface grinder.

Describe components of the HSRT surface grinder.

Describe common workholding components.

Describe accessories for workholding.

Describe how to mount a workpiece.

Describe the process of roughing a workpiece surface.

Identify settings for finishing a workpiece.

Describe grinding parallel sides.

Describe grinding the second side.

Describe edge grinding considerations.

Describe mounting a small, thin workpiece to a fixture.

Identify the steps necessary to grind the edges of a workpiece.

Describe squaring the fifth and sixth edges.

Describe mounting a workpiece for grinding a vertical surface.

Describe grinding a vertical surface.

Class Vocabulary

Term	Definition
adapter plate	A flat steel and brass component used to improve the hold on thinner workpieces. The angle plate converts the larger and widely spaced flux to smaller and closely spaced flux, which better grasps thinner workpieces.
angle plate	A workholding component used to establish an accurate 90° vertical surface. Angle plates are used to grind edges.
balance	The process of making a wheel round or concentric. Balancing may be accomplished through several methods, including truing with a diamond dresser.
base	The foundation of a grinding machine that supports all the other machine components.
column	A component at the top of the grinding machine that supports the spindle and vertical ways, and controls vertical motion of the grinding wheel.
crossfeed handwheel	A grinding machine component that controls movement along the saddle ways.
dress	To remove swarf, dull grains, and bonding material from a grinding wheel. Dressing sharpens the wheel.
electromagnetic chuck	A type of magnetic workholding device that produces a variable magnetic pull. When turned "on," the electromagnetic chuck can hold a variety of workpieces depending on the amount of direct current.
finishing	The final grinding operation intended to obtain the desired tolerance and surface finish.
fixture	A device that is used to position and hold a workpiece in place during grinding. Fixtures are normally used to hold smaller workpieces.
flux	Invisible lines of magnetic force produced by a magnet.
horizontal spindle	A grinding spindle with an axis that is oriented parallel to the table.
HSRT	Horizontal-spindle, reciprocating table. A type of surface grinding machine characterized by a spindle with an axis oriented parallel to a table that moves back-and-forth.
laminated V-block	A magnetic workholding component with a V-shaped groove down the middle of its body designed to hold round workpieces for light grinding. The laminated V-block sits on the magnetic chuck and extends flux while providing physical support.
magna-vise clamp	A two-piece magnetic clamping system with flexible fingers designed to hold nonferrous or very small workpieces during grinding.
magnetic chuck	A workholding device that is used to hold ferrous parts during grinding. Magnetic chucks can be permanent or electromagnetic.
magnetic chuck block	A magnetic workholding component that sits on the magnetic chuck and holds oddly shaped workpieces by extending flux and providing physical support.
magnetic parallel	A magnetic workholding device used to support warped or otherwise oddly shaped workpieces that would otherwise flatten out when magnetically chucked.
magnetic V-block	An electromagnetic workholding component with a V-shaped groove down the middle of its body designed to hold round, square, or rectangular workpieces.
nonmagnetic chuck	A workholding device that is used to hold nonferrous parts for grinding, usually with two jaws that grip and hold a workpiece in place.
oilstone	A fine-grained sharpening device that is typically lubricated with oil. Oilstones are used to remove minor abnormalities from workpieces and workholding devices.
permanent magnetic chuck	A type of magnetic workholding device consisting of a series of long magnetic inserts arranged side-by-side and interconnected within a grid of conductive material. The chuck is turned "on" by moving magnetic inserts inline with a conductive grid.
polarity	The direction of magnetic force. A line of polarity is a line of magnetic force, which must travel through a workpiece for the workpiece to be immobilized by a magnetic chuck.
reciprocating table	The grinding machine work surface characterized by the ability to move back-and-forth. Workholding devices hold the part on the reciprocating table.
relieved	Providing a clearance for subsequent machining operations.
roughing	An initial grinding operation that removes stock without regard to surface finish.
saddle	The component of a grinding machine that is attached to the ways of the base and through its own ways, allows motion in a third axis perpendicular to the axes of the other ways.
shim	A thin tapered metal component used to support a workpiece by filling small gaps or abnormal shapes.
spindle housing	A grinding machine component that contains the spindle.
surface grinding	A common grinding process that involves feeding the flat surface of a workpiece beneath a rotating grinding wheel as the workpiece reciprocates on a table.
surface grinding machine	A machine that grinds flat surfaces by feeding a workpiece beneath a rotating grinding wheel with the part held on a reciprocating table.
table handwheel	A grinding machine component that controls motion of the table along the base ways.
table reverse dogs	A control component of a grinding machine that reverses the direction of table movement at the end of a stroke.
true	To restore a grinding wheel to its original shape. Truing is also a method of wheel balancing.
vacuum vise	A workholding device used when grinding certain types of nonferrous workpieces. A vacuum vise uses air suction to immobilize the workpiece.
ways	Two precisely measured, parallel tracks that support and guide the movement of the grinding machine components, such as the reciprocating table and spindle housing.
wheel feed handwheel	A grinding wheel component that controls the incremental vertical motion of the wheelhead along the column ways.
wheelhead	A grinding machine component that is attached to the column ways and contains the spindle housing.