Thesis (Ph.D.)--Technische Universität Darmstadt, 2000. / Title from title screen. "Taken from URL: http://elib.tu-darmstadt.de/diss/000143"--Disc label. "The CD-ROM features the dissertation adding more metadata and technical notes"--Disc label. "CD-ROM made 8/2001"--Disc label. Includes bibliographical references and index.

Thesis--Technische Hochschule Carolo-Wilhelmina zu Braunschweig. / eContent provider-neutral record in process. Description based on print version record. Bibliography: p. 93-97.

The friction sawing of wood by a high speed rotating disk has been studied. The present experiments were carried out by sawing two commonly used timbers; namely, Douglas fir and Western red cedar of different moisture Contents. A 14 inch diameter, 14 gauge steel disk with a smooth edge, driven at a rotating speed of 4,620 rpm was used for the research. A theoretical analysis of heat transmission characteristics and temperature distribution in the sawing disk is presented. Experimental results showed that the frictional forces, power consumed and cutting temperatures increased as feed speeds increased. The results also showed that the moisture content of the wood had no noticeable influence on the sawing action. A narrow kerf, straight, smooth and polished cut surfaces are some of the advantageous features of the process. At low feed speeds the calculated cutting edge temperatures were well below the ignition temperature of the wood specimen. However at high feed speeds the experimental horse power values increased and high calculated cutting edge temperatures consequently obtained. Excessive power consumption and high cutting edge temperatures were believed to be related to the difficulty of disposition of cut material with a smooth edge disk. Reasonably high feed speeds were evident in cutting plywood and veneer. For these materials clean, smooth and polished cut surfaces were evident. The method may be advantageous in the cutting of plastic sheets. When cutting thicker lumber with this method the feed speed was confined to an impractical low level and power consumed was far higher than that required for ordinary sawing. Thus, whether this method of sawing can be put into practical use or not is determined by the possibility of having an effective means to dispose of cut material. In this connection several methods of modifying the disk for more efficient cutting and waste disposal are presented. / Applied Science, Faculty of / Mechanical Engineering, Department of / Graduate

The purpose of this study is to determine the condition of the power woodworking equipment used for instructional purposes in the high schools of Texas, the amount of money needed to repair and maintain the equipment now in use, the various policies followed by the schools in regard to the purchasing and maintenance of this equipment, the makes of machinery most frequently found, the average age of the equipment, and the makes and types of woodworking machines preferred by the instructors for instructional purposes.

This thesis deals primary with design of a woodworking machine focused on woodworking technology by cutting – rip saw. The introduction to the work is get to acquainted with the material to be processed – wood, and also the search of associated machines with the same technology of workpiece processing. Next part is focused on the safety of machining on woodworking machines and the individual safety features that the machines must contain are also analyzed. From this survey, a saw model with all the necessary features is created. The conclusion of the thesis is devoted to the risk analysis of the proposed machinery and their reduction.

This thesis deals with designing woodworking piece of machinery for thicknessing technology, surfacing planer, cutting and mortising, which are combined by changeable adapters. Thesis cointains a survey of selected woodworking machinery and technologies. It also provides an overview of safety rules for manipulation with woodworking machines and also safety features the machinery must comprise. The technical evaluation is included.