Optimization of the cutting action of a spring supported sash saw through computer simulated tooth trace analysis

Large, E. S.(Edward Sean) (1986) Optimization of the cutting action of a spring supported sash saw through computer simulated tooth trace analysis. Masters thesis, Memorial University of Newfoundland.

[English] PDF (Migrated (PDF/A Conversion) from original format: (application/pdf)) - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Download (11MB) [English] PDF - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. (Original Version)

Abstract

The influences of various factors on the mechanics of wood cutting by a spring-supported, vertically oscillating frame saw are examined. These include saw tooth pitch, tooth gullet depth and capacity, saw blade overhang, oscillation frequency and amplitude, and log feed speed. -- The efficiency and effectiveness of the cutting process are dependent primarily on the relative path of motion taken by each tooth through the wood during sawing; thus it is the tooth traces upon which the attention of this study is focused. The factors listed above govern the shapes of these traces, and thus it is the determination of optimum values for some of these factors which is the main objective here. -- For the purpose of tooth trace analyses, a computer program has been developed which, when coupled with plotting facilities, allows the user to view a set of simulated relative tooth paths. The program incorporates features which accommodate the other than normal kinematic characteristics of the plate spring supported sash, and combines these influences with those of the factors listed above. Most importantly it allows for the introduction of a non-constant log feed speed function, specifically one which combines a constant with a sinusoidal portion. -- A detailed analysis of the produced plots with a view to solution to inherent sash saw problems comprises the final portion of this paper. From specific observations and assumptions with respect to the mechanics of cutting of the saw teeth, simultaneous equations are developed and solved for three system variables. Finally, conclusions are drawn and recommendations made with respect to the development of a more efficient MUN (Memorial University of Newfoundland) Sash Saw design.

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