Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 36 for “"SAWING"”.
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Evaluation of a direct processing system for converting no. 3 grade red oak logs into rough dimension parts
… estimated. A combination method of actual log sawing and simulated cutting was used to obtain the dimension yields. Two sawing patterns (live-sawing and five-part-sawing) and two cutting sequences (rip-first and crosscut-first) were tested for their effects on dimension yields, cutting lengths, …
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The effect of hydraulic linear positioners on the production efficiency of a hardwood sawmill
… of: 1) lumber grade yields; 2) log value; 3) sawing time; and 4) sawing variation attributed to the linear positioners, using Factory Grade No. 2 red oak logs sawn into lumber by full-infinite taper and conventional sawing patterns. The results of this study indicate: 1) Hydraulic linear …
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Size control of sawn timber by optical means in breakdown saw machines
… and presents a method to understand and reduce sawing variation by examination of sawn timber sizes. Continuous timber size control offers improved opportunities for analysing saw machines or even individual sawblades. The thesis is illustrated with seven saw machine case studies that relate to …
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A multiple period combined optimization approach to sawmill production planning systems
… or market demand by changing production policy, sawing policy, or log boom selection. Production periods are tied together by log and lumber inventory. The model was tested using four market scenarios on a large log mill producing export products. In general, it was shown that the model responded …
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A study of the performance of diamond wire in hard natural stone
… are described, pertaining to diamond wire sawing operating conditions. An equation of chip thickness in relation to the cutting action of a diamond segment is derived and chip thicknesses are determined for wire sawing operating parameters used in different stone types. The sawability and …
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Nucleation and solidification of silicon for photovoltaics
… by growing a large piece of silicon and then sawing it into ~200 pm wafers, a process which converts one-half of the high-purity silicon into waste sawdust. To bypass the sawing process, a new method for making high-quality multicrystalline wafers without sawing is under development. This …
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The cutting behavior of bandsaws
… the body of the blade and the sawn surfaces, the sawing accuracy is governed by the tooth-tip stiffness and the magnitude of the lateral cutting forces. When the clearance gap is small compared to the blade deflection, the contact forces dominate and poor cutting accuracy results because the blade …
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Analysis of Red Oak Timber Defects and Associated Internal Defect Area for the Generation of Simulated Logs
Log sawing simulation computer programs can be a valuable tool for training sawyers as well as for testing different sawing patterns. Most available simulation programs rely on databases from which to draw logs and can be very costly and time-consuming to develop. In this study, a computer program …
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Impact of Ellipticality on Lumber Grade and Volume Recovery For Red Oak Logs
… volume recovery for red oak logs under current sawing methods. Logs of low and high ellipticality were selected and processed at four Appalachian area sawmills. Processing variables and lumber output were tracked for all logs. It was determined that there was no significant difference in …
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A simulation and empirical study of cross-laminated timber from waney SA Pine timber
… widths were utilised. The investigation used a sawing study as well as computer simulations to evaluate the effect of increased wane on volume recovery in a sawmill. The simulation study was performed using the Simsaw 6 software program. Forty-five logs, diameters from 18.0-33.9cm, lengths from …
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New Field Testing Procedure For Measuring Residual Stress in Plain Concrete Pavements and Structures
… using cantilevered concrete beams by instead sawing a linear notch near one end of the strain gage and sawing two linear notches near both ends of the strain gage. Results for the doubly notched concrete beam proved to be a much improved method for measuring residual stresses when compared to …
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Geometry control of recrystallized silicon wafers for solar applications
… by eliminating the waste streams caused by sawing ingots into individual wafers. Professor Emanuel Sachs has developed a new method of manufacturing silicon wafers that consists of first, rapidly creating a low quality wafer, and then enhancing its electrical properties in a subsequent step. …
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The potential for short length lumber in the furniture and cabinet industries
… of parts produced per furniture rough mill sawing operation; the regression of board feet per sawing operation was significantly and negatively related to lumber length in 14 of the 18 cutting bill combinations tested. Regression results indicated that as crook decreases, total cutting …
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Simulating Optimal Part Yield from No. 3A Common Lumber
… lumber in a grade mix increases, part yields and sawing efficiencies decrease. The results also indicated that higher part yields will be obtained when processing short-length No. 3A Common lumber between 6 and 8 feet in length.
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Nondestructive evaluation of wooden logs using ground penetrating radar
… such as Ground Penetrating Radar (GPR) prior to sawing can greatly increase the productivity and yield of high value lumber. Currently GPR has been widely used for civil engineering applications for nondestructive testing of bridges and highways. GPR is also being used for geological and …
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Influence of Silane Penetrating Sealer on Deicer Scaling and Absorption of Concrete Highway Pavement
… of concrete produced using different aggregates, sawing techniques and equipment, and their performance after applying silane to the surface. In total 30 samples with and without silane coating were taken into consideration. Wisconsin limestone and granite were the two types of aggregates …
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Development of Residual Stress Measurement for Concrete Pavements through Cantilevered Beam Testing
… was most pronounced with the notch tests. Sawing a notch on both sides of a strain gage was able to relax all of the strain induced by the cantilever loading, making the residual stress calculation quite simple. A two-dimensional finite element analysis was used to parallel the testing and …
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Silicon cast wafer recrystallization for photovoltaic applications
… by a combination of grinding and abrasive wire sawing. While mature, these processes remain slow and wasteful of raw materials. As the PV industry scales to meet increasing global demand for renewable energy, new processes for creating wafers must be explored. This project sets out to enable …
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The effect of tooth geometry on power hacksaw blade performance.
… has developed a method for accurately predicting sawing rates from the single tooth data gathered. The information gathered from the single tooth tests has enabled the author to isolate the most important aspects of tooth geometry affecting blade performance, and as a result, a new tooth design …
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Robot arm control exploiting natural dynamics
… turning cranks, playing with a Slinky toy, sawing wood, throwing balls, hammering nails and drumming. For most of these tasks, the controllers at each joint are completely independent, being coupled by mechanical coupling through the physical arm of the robot. The thesis shows that this …
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