Book contents
- Frontmatter
- Contents
- Foreword by Graziano Curti
- Preface
- Acknowledgments
- 1 Coordinate Transformation
- 2 Relative Velocity
- 3 Centrodes, Axodes, and Operating Pitch Surfaces
- 4 Planar Curves
- 5 Surfaces
- 6 Conjugated Surfaces and Curves
- 7 Curvatures of Surfaces and Curves
- 8 Mating Surfaces: Curvature Relations, Contact Ellipse
- 9 Computerized Simulation of Meshing and Contact
- 10 Spur Involute Gears
- 11 Internal Involute Gears
- 12 Noncircular Gears
- 13 Cycloidal Gearing
- 14 Involute Helical Gears with Parallel Axes
- 15 Modified Involute Gears
- 16 Involute Helical Gears with Crossed Axes
- 17 New Version of Novikov–Wildhaber Helical Gears
- 18 Face-Gear Drives
- 19 Worm-Gear Drives with Cylindrical Worms
- 20 Double-Enveloping Worm-Gear Drives
- 21 Spiral Bevel Gears
- 22 Hypoid Gear Drives
- 23 Planetary Gear Trains
- 24 Generation of Helicoids
- 25 Design of Flyblades
- 26 Generation of Surfaces by CNC Machines
- 27 Overwire (Ball) Measurement
- 28 Minimization of Deviations of Gear Real Tooth Surfaces
- References
- Index
26 - Generation of Surfaces by CNC Machines
Published online by Cambridge University Press: 04 September 2009
- Frontmatter
- Contents
- Foreword by Graziano Curti
- Preface
- Acknowledgments
- 1 Coordinate Transformation
- 2 Relative Velocity
- 3 Centrodes, Axodes, and Operating Pitch Surfaces
- 4 Planar Curves
- 5 Surfaces
- 6 Conjugated Surfaces and Curves
- 7 Curvatures of Surfaces and Curves
- 8 Mating Surfaces: Curvature Relations, Contact Ellipse
- 9 Computerized Simulation of Meshing and Contact
- 10 Spur Involute Gears
- 11 Internal Involute Gears
- 12 Noncircular Gears
- 13 Cycloidal Gearing
- 14 Involute Helical Gears with Parallel Axes
- 15 Modified Involute Gears
- 16 Involute Helical Gears with Crossed Axes
- 17 New Version of Novikov–Wildhaber Helical Gears
- 18 Face-Gear Drives
- 19 Worm-Gear Drives with Cylindrical Worms
- 20 Double-Enveloping Worm-Gear Drives
- 21 Spiral Bevel Gears
- 22 Hypoid Gear Drives
- 23 Planetary Gear Trains
- 24 Generation of Helicoids
- 25 Design of Flyblades
- 26 Generation of Surfaces by CNC Machines
- 27 Overwire (Ball) Measurement
- 28 Minimization of Deviations of Gear Real Tooth Surfaces
- References
- Index
Summary
INTRODUCTION
The design of computer controlled machines extended the opportunity for the development of gears with a new topology of tooth surfaces. The new topology must provide the localization of the bearing contact, its stability even for misaligned gear drives, and the reduction of vibrations caused by transmission errors. The new topology of gear tooth surfaces can provide a predesigned function of transmission errors of a parabolic type that will be able to absorb piecewise linear functions of transmission errors caused by gear misalignment (see Section 9.2). The advantages of new surface topology can be achieved by application of generating tools of a simple enough shape just because the computer controlled machine is able to provide properly varied relations between the motions of the tool and the workpiece.
An additional advantage of application of a computer controlled machine is the possibility of increasing the precision of the installation of the machine-tool settings. In the most general case, a computer controlled machine for generation of gear tooth surfaces must have six degrees-of-freedom. Five of these degrees-of-freedom are necessary for the control of related motions of the tool and the workpiece. The sixth degree-of-freedom is required to provide the desired velocity of cutting (grinding) and is not related to the process of surface generation.
In the following sections of this chapter we consider three cases of generation of the workpiece surface Σp by the given tool surface Σt:
(i) Surfaces Σt and Σp are in continuous tangency and they contact each other at every instant at a point but not at a line.
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- Gear Geometry and Applied Theory , pp. 746 - 768Publisher: Cambridge University PressPrint publication year: 2004