Precision Machine Design. Topic 2. Assessment of errors in precision machines. Purpose: This lecture defines types of errors and discusses methods for. All subsequent chapters cover specific aspects of precision machine design. The Precision Machine Design, and later encouraged Layton to. Precision Machine. Design. Alexander H. Slocum. Massachusetts Institute of There are many fine texts on the design of machine elements, and this book.

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Precision Design Principles. 2. The Eleven Principles and Techniques for the Design of. High Precision Machines (McKeown, ). 1. Structure: symmetry. Precision Machine Design - Download as PDF File .pdf), Text File .txt) or read online. Precision Machine Design - Ebook download as PDF File .pdf) or read book online. precision mechanical, electrical. electronics, optical design of machinery.

The chapter concludes with very enlightening case studies of the design processes for a high-speed machining center and a coordinate-measuring machine. Chapter 2 discusses the performance issues of accuracy, repeatability, and resolution.

Precision machine design

The error budget is introduced as an excellent tool for the preconstruction estimation of machine and environmental errors. The homogeneous transformation matrix is presented as a method for modeling the effects of various machine errors. Typical error sources are identified e. Chapter 2 ends with a case study of leadscrew-induced carriage straightness-of-motion errors.

Slocum devotes three chapters to the discussion of sensor issues. Chapter 3 defines various terms used in the discussion of sensors e.

Chapter 3 also discusses the operation, typical performance characteristics, and applications of nonoptical sensors such as capacitance probes, hall effect sensors, inductive sensors, LVDTs, and so forth.

Chapter 4 is a discussion of operating principles, performance characteristics, and applications for various optical sensors, including autocollimators, optical encoders, and interferometric sensors.

Chapter 5 presents sensorrelated issues, such as sensor location, alignment, mounting, and environment. The concept of the metrology frame is introduced as a means of achieving a reference that is unaf- fected by the machine process. Sensor calibration issues e. Finally, a case study of the design of a laser telemetric system is presented. Chapter 6 is a detailed case study of machine error compensation. This case study discusses the construction of a homogeneous transformation matrix for a turning center, the mapping of the machine's geometric and thermal errors, and the development and implementation of a real-time error compensation scheme.

Various design considerations are discussed in Chapter 7. These issues range from manufacturability and material selection to structural design and support system requirements. The chapter begins with a discussion of the available fabrication, heat treating, and plating techniques. Next is an examination of material selection issues e.

The sections on structural and joint design focus on issues such as minimizing vibration transmission and distortion and maximizing damping and thermal stability. Bolted joints, pinned joints, adhesive joints, etc.

The section on support systems emphasizes the importance of systems and components such as safety systems, coolant system equipment, sealing systems, and tooling and fixturing hardware. Chapters 8 and 9 discuss contacting and noncontacting bearings, respectively. If they are mounted on the ceiling, monorail style, they are very expensive. However, if robots were to take advantage of simpler designs and gravity its free!

Magnabots use magnetic wheels to hold themselves to an iron roadway on the ceiling.

The goal of this project is to design, build, install, and demonstrate a radio controlled MagnaBot material transport system in CIMIT's operating room of the future in University Park. Catheter Robots Catheters are commonly used to image inside the body, and their tips are directed by applying tension to an internal cable, or torsion to the entire catheter. Can several be bundled to form a robotic hand for laperospcopic surgery?

What new tools and procedures would result if this concept proves viable? The goal of this project is to evaluate existing catheters and develop methods for increasing their force and stiffness capabilities at the tip. Flextester II In 2. This prototype was designed for proof of concept and it has limitations in terms of adjustability, level of automation, user friendliness….

The goal of this project is to design a new and much more elegant version of the instrument "F-2 with enhanced capabilities, for example it is desired to be able to measure not only in the wafer plane, but also out of plane, which requires a additional metrology axes. A vision system and a better wafer chuck should be added as well. The project is a straightforward one with a well defined set of functional requirements.

There is a lot to learn about precision machine design, flexures, and precision calibration procedures. Low-Cost, High-Repeatability Kinematic Couplings Kinematic Couplings are commonly used throughout industry to create interfaces with extremely high repeatability. In addition, the effects of coatings, such as Titanitum Nitride, on kinematic coupling surfaces will also be studied.

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The goal of this project is to develop design methodology for low-cost precision interfaces using these concepts, then build and repeatability-test prototypes of each concept. These prototypes would be compared to a standard canoe ball-groove configuration in a test setup built by the group.

This project is straightforward and would provide experience on kinematic couplings and high-precision e. Bike Shifter: Are you an avid biker?

Can't wait to hit the trails after work? Then this project might be for you!!! Current shifter mechanisms for both mountain and road bikes change the gear by shifting the the chain between 3 chain rings in the front, and 5 to 8 sprockets in the rear, resulting in anywhere from 10 to 27 gears.

In practice, however, many of the resulting gear ratios overlap. In addition, some of the gear combinations may not be usable because the chain would experience too much shear stress due to angular misalignment.

To solve this, a new type of shifter mechanism is proposed that would synchronize the shifting of the front and rear derailleur, resulting in a range of gears with continuously increasing gear ratios. The new mechanism would eliminate the need for having two separate shifter mechanisms at the handle bar through the new shifter that can be mounted either to the right handle bar for right handers or left handle bar for left handers.

The goal of this project is to design, build and patent a product that would hit a niche in a very competitive, yet lucrative market: sports equipment.

Precision Machine Design

For this purpose, a device that stretches material samples 20 mm long, mm wide, 0. The goal of this project is to supply researchers in the Mechanical and Materials Departments of MIT with a versatile, accurate, yet easy to use materials testing device for a novel type of composite called NanoComposites. Designing and building this device will require good knowledge of power transmission systems, bearings, grippers, force and displacement sensors, and controls.

However to obtain a reasonable cross section, many many parallel curved plates must be assembled. An early attempt to use a diamond machined reference flat to align the edges of the curved plates demnstrated feasability, but structural deformations from bolts etc redcued accuracy. This project will create the "final" production-ready system to create the assemblies to be used in the next generation space telescope.

Low Cost Eyeglasses Over one billion people need glasses but do not own them. People who have correctable vision problems are often handicapped as a result as the lack of correction. Without glasses, simple tasks become more difficult or impossible, productivity slows, and accidents occur more frequently.

Based purely on the lack of productivity and enjoyment, the lack of eyeglasses is one of the largest solvable problems in the developing world. In fact, it is significantly more common than often cited problems such as cataracts or glaucoma.For a controller with N bits of digital to analog resolution. Slocum Epoxy granite structures Can be cast with intricate passages and inserts.

Ferdi Zhelara Bernardino. If they are mounted on the ceiling, monorail style, they are very expensive. Static stiffness requirements can be predicted. Includes bibliographical references and index. There is a lot to learn about precision machine design, flexures, and precision calibration procedures.

Some of the possible projects already have significant background work accomplished. Project 1.

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