The article describes the dynamics of drill bits, drilling modes, distribution resistance forces when with bits. theory a well arbitrary shape, possible shapes contacting figures at bottom hole and type bit operating in rotation pair mode are considered. This has properties double center rotation, which results attrition drilling. At same time, during drilling, load on will be located throughou...

Drilling a deep vertical well at low cost is very important for accelerating the exploration and development of oil gas resources. Vertical drilling BHA design key to drill well, however still an art not science in some formation. In this paper, new mechanical model bent-housing motor established, build rate prediction method considering formation properties presented uncertainties proposed. Th...

The fast monitoring of tool wears by using various Cutting signals and the prediction models developed rapidly in recent years. Comparatively, various wear forecast models based on artificial neural networks (ANN) perform much better in accuracy and speediness than the conventional prediction models. Combining the prominent dynamic properties of back propagation neural network (BPNN) with the e...

Composite materials are continuously replacing the conventional and alloys owing to their weight reduction. Biodegradable fiber-reinforced composite one of prime attractions researcher due easy availability low cost. During drilling these Natural Fiber Reinforced Plastic composites (NFRP), delamination surface roughness problems encountered, which be minimized get better output by adopting diff...

This research is a follow-up study from previous related to the optimization of engravingprocess with same object, mahogany wood processed G-Weike WK1212 CNC Router machineand3mmConicalbitusingTaguchimethod.Inthisresearch,theoptimizationmethodused FullFactorial Design multiresponse plots optimization, where use this method also refers theresults ofprevious studies but its implementation applied...

naturally occurred soil deposits inherit heterogeneity and anisotropy in their strength properties. the main purpose of this paper is to model the soil stratum with anisotropy consideration and spatially varying undrained shear strength by using random field theory coupled with finite difference numerical analysis to evaluate their effect on the bearing capacity of the shallow foundations. in t...

Sapindus mukorossi seeds are commonly drilled and processed into Buddha beads other craft products. To improve the machining qualities of micro-drilling S. seeds, effects drilling parameters (feed rate, speed, drill diameter) on force, hole diameter morphology were found. The mechanism behind these changes was further analyzed. process for optimized. Results indicated that each parameter influe...

Abstract To meet assembly requirements, carbon fiber reinforced plastics (CFRP) generally require mechanical processing, of which the most common form is drilling. As a result increasing quantity use and growing structural complexity CFRP, demand for batch high-precision hole making becoming increasingly urgent. However, existing research mostly focused on small-batch small-thickness drilling s...

The Western Mining Resource Center (WMRC) at the Colorado School of Mines (CSM) received a grant from the National Institute for Occupational Safety and Health (NIOSH) to perform a study that will help reduce the amount of respirable dust generated from the cutting of coal. The study is based upon laboratory testing and field experience. This information is being used to develop a new cutterhea...

The industry-leading AWG7000 Series arbitrary waveform generators (AWG) represent a cutting edge benchmark in performance, sample rate, signal fidelity, and timing resolution. With up to 24 GS/s and 10-bit vertical resolution, the AWG7000 Series of AWGs delivers the industry's best signal stimulus solution for ever-increasing measurement challenges. This allows for easy generation of very compl...