Swab and surge pressure fluctuations are decisive during drilling for oil. The axial movement of the pipe in wellbore causes fluid; these can be either positive or negative, corresponding to direction pipe. For example, if drill string is lowering down borehole, drop (surge pressure), pulling out hole, negative (swab pressure). intensity depends on speed (tripping in) withdrawing out). High tri...

Many surgeons in low-resource settings do not have access to safe, affordable, or reliable surgical drilling tools. Surgeons often resort to non-sterile hardware drills because they are affordable, robust, and efficient, however impossible to sterilize. A promising alternative is to use a Drill Cover system (a sterilizable fabric bag plus surgical chuck adapter) so that a non-sterile hardware d...

The present work deals with developing a fuzzy back propagation neural network scheme for prediction of drill wear. Drill wear is an important issue in the manufacturing industries, which not only affects the surface roughness of the hole but also influences the drill life. Therefore, replacement of drill at an appropriate time is of significant importance. Flank wear in a drill which depends u...

This paper presents a new thermal model for bone drilling with applications to orthopaedic surgery. The new model combines a unique heat-balance equation for the system of the drill bit and the chip stream, an ordinary heat diffusion equation for the bone, and heat generation at the drill tip, arising from the cutting process and friction. Modeling of the drill bit-chip stream system assumes an...

The analysis of drill cutting angles is important for the design of high-performance drill geometry. The cutting angles along the cutting edge of a drill are determined by the combination of its flute and flank surfaces. This paper examines the analysis of both flute and flank surface models and the evaluation of drill cutting angles. A new mathematical model for an arbitrary drill flute face i...

Drilling is the most frequently employed operation of secondary machining for fiber-reinforced materials owing to the need for structure joining. Delamination is one of the serious concerns during drilling. Practical experience shows that an eccentric twist drill or an eccentric candle stick drill can degrade the quality of the fiber reinforced material. Comprehensive delamination models for th...

Due to gravity, drilling cuttings are easily accumulated in an inclined well section, ultimately forming a bed, which places the drill pipe under strong friction torque. In severe cases, this can cause dragging, stuck drills, and broken tools. Because conventional fluids difficult prevent formation of sections, method carrying with pulsed fluid improve wellbore cleanness is proposed. Experiment...