Types of drilling methods pdf

Types of drilling methods pdf
Drilling is a cutting process that uses a drill bit to cut a hole of circular cross-section in solid materials. The drill bit is usually a rotary cutting tool, often multi-point.
Evolution of directional drilling since 1900 Directional drilling is the science of controlling or correcting a wellbore, along a predetermined trajectory, to one or more
Sonic Drilling – Sonic drilling is a safe, clean and low-impact drilling technique. Boreholes are drilled, cored and cased by rotating and vibrating the rod, core barrel and casing at resonant sonic frequencies. Sonic drilling generates considerably less drill spoils than auger, mud or air rotary methods, saving additional project resources.
Description: Conventional offshore drilling is a type of oil excavation in which the well is drilled vertically from the surface down to the pay zone (reservoir where the oil is). Conventional drilling is the oldest, and still the most common method. The other two main types of offshore oil drilling
The selection of underground mining methods is primarily based on the geological/spatial setting of the deposit. Candidate methods can therefore be chosen and ranked based on estimated operational/capital costs, production rates, availability of labors and materials/equipments, and environmental considerations. The method offering the most reasonable and optimized combination …
Drilling. This article is about drilling in English language teaching, a technique that is still being used by many teachers although it has been discredited in modern methods.
The drilling program can involve one or more types of drilling, conditioned by the material to be sampled, rock environment, and the reason of the sampling. Basically, there are two types of drilling, one involves core drilling and the other one is reversed circulation.
Four drilling methods are widely used, each depending on the type of information required and/or the rock types being drilled. Air-rotary drilling : this is a quick and economical method of …
Drilling & Geology Resource presentation for exercises related to Storvola & Festningen Kjell Kåre Fjelde – UiS . Festningen Exercise •Solve an exercise that is focusing on elements to be considered when constructing a drilling program •Can also be found on the resource CD . Festningen exercise •Exercise handed out to each group in advance •Work with it during the excursion and
ROTARY DRILLING BITS This chapter covers the following items ¾ Roller cone bits ¾ The three cone bits • Principle features • Design factors • Rock bit classifications ¾ Poly diamond compact (PDC) bits ¾ Diamond bits ¾ Bit selection ¾ Bit dullness ¾ Well bit record and geological information Introduction ¾ Drilling bit represents the heart of drill string ¾ Proper selection is
Drilling equipment and methods are used by the construction and mining industries to drill holes in both rock and earth. Same or similar equipment may in some instances be used for drilling both materials. 5 CHAPTER 12a. DRILLING ROCK AND EARTH ENCE 420 ©Assakkaf Slide No. 8 DRILLING EQUIPMENT Purposes for which drilling are performed vary a great deal from general to …
Directional drilling is defined as the practice of controlling the direction and deviation of a wellbore to a predetermined underground target or location. This section describes why directional drilling is required, the sort of well paths that are used, and the tools and methods employed to drill those wells.
Drilling can be comfortably and effectively incorporated into many types of lessons – whether you use a PPP model or a task-based approach, for example. Drilling may follow a language focus stage particularly if you are dealing with spoken language.
The installation process and methods of pile foundations are equally important factors as of the design process. Pile foundation installation methods are by pile hammer and boring by mechanical auger. To avoid damages to the piles, during design, installation Methods and installation equipment
A drilling fluid can be used to prevent side wall collapse and prevent water from entering the pier hole. As the auger is drilled into the ground, the drilling fluid is pumped into the hole Most of the drilling is undertaken under the drilling fluid
Technical Manual Drilling Techniques UNICEF
https://www.youtube.com/embed/om6GQKfoS1g

Drilling Methods for Tube Wells and Its Selection
of rig type, is that the drilling industry has made big changes in the design and layouts of all rig types to improve safety for the people working on these rigs, safeguard the envi-ronment, and improve the efficiency to minimize the time it takes to construct the well. Land rigs As mechanization made the hunt for hydrocarbons more ef-ficient, it had a direct effect on land rig design. The
Auger drilling is commonly used to take samples in soft unconsolidated ground during the reconnaissance stage of mineral exploration, often for environmental and geotechnical
A different drill bit can be used for each sediment type. Above the water table, the borehole gen-erally stays open without the need for support. Below the water table a temporary PVC casing may be used to prevent the hole from col-lapsing, and can be emptied either with an auger or a bailer. The perma- …
TYPES OF DRILLING MACHINES There are two types of drilling machines used by TC 9-524 Reaming, counterboring, and counter-sinking may require slower speeds than drilling …
The drilling rate by this method depends on type of subsurface formation penetrated and type of rig equipment used. Contrary to the cable tool method the rate of drilling by hydraulic rotary method does not depend upon the depth of the hole.
WATER WELL DRILLING METHODS There are several different types of drilling methods used in Michigan. This section covers the most common methods used. Rotary Drilling Rotary drilling is the most popular well drilling method in Michigan. Mud rotary is widely used in the Lower Peninsula where substantial overburden exists, while air rotary rigs are found primarily in the Upper Peninsula and the

The investigation program included drilling boreholes and collecting soil samples at desired intervals for subsequent observation and laboratory testing. The investigation program will consist of soil boring and sampling at desired intervals for subsequent observation and laboratory testing to determine the capacity of pile foundation economically and safely. 3.2 Boring and Sampling The
DIFFERENT DRILLING METHODS USED IN HYDROGEOLOGY E a r t h A n d E n v i r o n m e n t a l S c i e n c e s , B a h r i a U n i v e r s i t y, I s l a m a b a d 2. CONTENTS 1.0 2.0 3.0 3.1 3.2 Conclusion References Introduction Project Objective Description of Drilling Methods Methods without Drilling Fluids Methods that use Drilling Fluids PAGE 1 2 3 3 6 11 12
direct rotary method where drilling fluid is forced down the annulus between the drill stem and hole wall and recovered from the drill stem. This reverse type of drilling is a suction
that they only require a pre-drilled hole (pre-drill sizes), but some come with self-drilling (shown in above pic) or self-tapping tips. Here’s a large list of different types of tips, the
02 Rock drilling methods and machinery – NFF med fagstoff
3.2.6 Location Methods 3.2.7 Clamping 3.2.8 Drill Bushes 3.2.9 Jig Feet and Legs 3.2.10 Chip Control 3.3 Types of Jig and Examples 3.4 Summary 3.5 Key Words 3.1 INTRODUCTION Mass production targets on increasing productivity and increasing accuracy by reducing the setup cost and manual fatigue. One of the common practices to achieve the goals of mass production is to use jigs. Let us …
Drilling methods for drilling a hole Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website.
Different Drilling Methods According To Surface Type – There are numerous type of drilling methods used in the construction industry. Each of the drilling method has its own characteristic structure applicable to certain type of surfaces.
Drilling Methods The components of a drill rig are (1) the rig itself, which supplies the power to mobilize, drill rock, and remove the drill cuttings from the hole; (2) the mounting; (3) the drill steels or drill string; and (4) the
Drilling is a metal cutting process carried out by a rotating cutting tool to make circular holes in solid materials. Tool which makes hole is called as drill bit or twist drill. Drilling machine A power operated machine tool which holds the drill in its spindle rotating at high speeds and when actuated move linearly against the work piece produces a hole. Types of drilling machine. Portable

Module 1 : Site Exploration and Geotechnical Investigation Lecture 2 : Boring Methods of Exploration [ Section 2.1 : Different Types of of Boring Methods ] Objectives In this section you will learn the following Displacement borings Wash boring Auger boring Rotary drilling Percussion drilling Continuous sampling. Module 1 : Site Exploration and Geotechnical Investigation Lecture 2 : …
PDF Drilling and blasting as a tunnel excavation method Blasting methods & cut types in tunnel excavations. 9. Tunnel excavation method. 10. Tunnelling accuracy. Ö.SATICI . 3. Hacettepe
types of horizontal boring, namely: auger boring, horizontal directional drilling, and pipe ramming. These methods These methods have been used or are known to have future potential for use under MoDOT roadways and/or right-of-way.
https://www.youtube.com/embed/MRA6d0fPqgI
Review of Drilling Completion and Remediation Methods for
Drilling is undertaken only in advanced mineral exploration and the most common drilling method is very similar to water bore drilling. This fact sheet explains the different exploration methods and equipment, how exploration is regulated, the potential impacts and how these can be managed. What is exploration? Exploration is the process of searching for deposits of minerals in the ground. The
Drilling Method. Advantages. Preferred CMT Installation Technique. Comments. Sonic. Advancing casing during drilling minimizes redistribution of contaminants in borehole.
Conventional wells. In the early days of the oil industry, drilling wells was a simple operation. A well location was picked at top reservoir, and the well was drilled directly down to the target as a vertical well.
Oil and gas exploration makes use of several types of drilling methods and platforms based on the type of formations, geographic location, soil type and the like.and Methods PILES AND PILE-DRIVING EQUIPMENT By Dr. Ibrahim Assakkaf ENCE 420 – Construction Equipment and Methods Spring 2003 Department of Civil and Environmental Engineering University of Maryland, College Park CHAPTER 19. PILES AND PILE-DRIVING EQUIPMENT ENCE 420 ©Assakkaf Slide No. 1 PILES. 2 CHAPTER 19. PILES AND PILE-DRIVING EQUIPMENT …
The advantage of a liner completion is that the drilling fluid system can be changed and a nondamaging fluid used to drill the pay interval. Several types of liner completions are commonly employed in well completions. These include
The drilling method is site-specific and depends on the type of logging and testing to be performed. No single method is best for all conditions and applications. Well drilling methods are numerous and only the basic principles and applicability of selected and conventional methods are presented.
Drilling Mud Circulation Tanks • Mud rotary drilling employs a dense drilling fluid under its own hydrostatic pressure to support the walls of an open borehole • The drilling fluid is …
2.0 TYPES OF MICROPILES AND DRILLING METHODS 2.1 Micropile Classification Micropiles are generally classified firstly according to design application and grouting method. The design application dictates the function of the micropile while the grouting method defines the grout/grout bond capacity. In the design application, there are two general types of application. The first type is where the
Directional drilling petrowiki.org
types of rotary drilling methods are best classified by the type of drilling fluid used, and/or the way in which the fluid is circulated through the borehole.
Page 5 of 360 4.11.6. Casing Method of Grouting 4.11.7. Grouting Failures 4.11.8. Installation of Bentonite Grout 4.12. Plumbness and Alignment
Methods of Installing Pile Foundations The Constructor

Drilling Methods Drilling Rig Oil Well Scribd

Robertson GeoConsultants Inc. Consulting Engineers and

ROTARY DRILLING BITS This chapter covers the following items

“Understanding Groundwater & Wells in Manual Drilling”

https://www.youtube.com/embed/0-KLWEnwiaY
Evolution of directional drilling since 1900 IADC

Five Most Common Drilling Methods Used in Oil and Gas
Different Drilling methods used in hydrogeology SlideShare
NATIONAL DRILLING ASSOCIATION DRILLER’S MANUAL

Trenchless Construction Methods and Implementation Support
https://www.youtube.com/embed/G2Hs51QDszc

Drilling in English Language Teaching myenglishpages.com

Module 1 Site Exploration and Geotechnical Investigation
Drilling in English Language Teaching myenglishpages.com

types of rotary drilling methods are best classified by the type of drilling fluid used, and/or the way in which the fluid is circulated through the borehole.
Directional drilling is defined as the practice of controlling the direction and deviation of a wellbore to a predetermined underground target or location. This section describes why directional drilling is required, the sort of well paths that are used, and the tools and methods employed to drill those wells.
Four drilling methods are widely used, each depending on the type of information required and/or the rock types being drilled. Air-rotary drilling : this is a quick and economical method of …
The drilling method is site-specific and depends on the type of logging and testing to be performed. No single method is best for all conditions and applications. Well drilling methods are numerous and only the basic principles and applicability of selected and conventional methods are presented.
Sonic Drilling – Sonic drilling is a safe, clean and low-impact drilling technique. Boreholes are drilled, cored and cased by rotating and vibrating the rod, core barrel and casing at resonant sonic frequencies. Sonic drilling generates considerably less drill spoils than auger, mud or air rotary methods, saving additional project resources.
Drilling Mud Circulation Tanks • Mud rotary drilling employs a dense drilling fluid under its own hydrostatic pressure to support the walls of an open borehole • The drilling fluid is …
ROTARY DRILLING BITS This chapter covers the following items ¾ Roller cone bits ¾ The three cone bits • Principle features • Design factors • Rock bit classifications ¾ Poly diamond compact (PDC) bits ¾ Diamond bits ¾ Bit selection ¾ Bit dullness ¾ Well bit record and geological information Introduction ¾ Drilling bit represents the heart of drill string ¾ Proper selection is
Page 5 of 360 4.11.6. Casing Method of Grouting 4.11.7. Grouting Failures 4.11.8. Installation of Bentonite Grout 4.12. Plumbness and Alignment
A different drill bit can be used for each sediment type. Above the water table, the borehole gen-erally stays open without the need for support. Below the water table a temporary PVC casing may be used to prevent the hole from col-lapsing, and can be emptied either with an auger or a bailer. The perma- …
and Methods PILES AND PILE-DRIVING EQUIPMENT By Dr. Ibrahim Assakkaf ENCE 420 – Construction Equipment and Methods Spring 2003 Department of Civil and Environmental Engineering University of Maryland, College Park CHAPTER 19. PILES AND PILE-DRIVING EQUIPMENT ENCE 420 ©Assakkaf Slide No. 1 PILES. 2 CHAPTER 19. PILES AND PILE-DRIVING EQUIPMENT …

Drilling methods SlideShare
Mineral exploration drilling Parliament of Western Australia

PDF Drilling and blasting as a tunnel excavation method Blasting methods & cut types in tunnel excavations. 9. Tunnel excavation method. 10. Tunnelling accuracy. Ö.SATICI . 3. Hacettepe
Conventional wells. In the early days of the oil industry, drilling wells was a simple operation. A well location was picked at top reservoir, and the well was drilled directly down to the target as a vertical well.
Drilling is undertaken only in advanced mineral exploration and the most common drilling method is very similar to water bore drilling. This fact sheet explains the different exploration methods and equipment, how exploration is regulated, the potential impacts and how these can be managed. What is exploration? Exploration is the process of searching for deposits of minerals in the ground. The
that they only require a pre-drilled hole (pre-drill sizes), but some come with self-drilling (shown in above pic) or self-tapping tips. Here’s a large list of different types of tips, the
Different Drilling Methods According To Surface Type – There are numerous type of drilling methods used in the construction industry. Each of the drilling method has its own characteristic structure applicable to certain type of surfaces.
The installation process and methods of pile foundations are equally important factors as of the design process. Pile foundation installation methods are by pile hammer and boring by mechanical auger. To avoid damages to the piles, during design, installation Methods and installation equipment
and Methods PILES AND PILE-DRIVING EQUIPMENT By Dr. Ibrahim Assakkaf ENCE 420 – Construction Equipment and Methods Spring 2003 Department of Civil and Environmental Engineering University of Maryland, College Park CHAPTER 19. PILES AND PILE-DRIVING EQUIPMENT ENCE 420 ©Assakkaf Slide No. 1 PILES. 2 CHAPTER 19. PILES AND PILE-DRIVING EQUIPMENT …

Blaster’s Training Modules Module 4 – Blasthole Drilling
Directional drilling petrowiki.org

Drilling. This article is about drilling in English language teaching, a technique that is still being used by many teachers although it has been discredited in modern methods.
Drilling methods for drilling a hole Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website.
Drilling equipment and methods are used by the construction and mining industries to drill holes in both rock and earth. Same or similar equipment may in some instances be used for drilling both materials. 5 CHAPTER 12a. DRILLING ROCK AND EARTH ENCE 420 ©Assakkaf Slide No. 8 DRILLING EQUIPMENT Purposes for which drilling are performed vary a great deal from general to …
Evolution of directional drilling since 1900 Directional drilling is the science of controlling or correcting a wellbore, along a predetermined trajectory, to one or more
2.0 TYPES OF MICROPILES AND DRILLING METHODS 2.1 Micropile Classification Micropiles are generally classified firstly according to design application and grouting method. The design application dictates the function of the micropile while the grouting method defines the grout/grout bond capacity. In the design application, there are two general types of application. The first type is where the
Drilling is a cutting process that uses a drill bit to cut a hole of circular cross-section in solid materials. The drill bit is usually a rotary cutting tool, often multi-point.

Mineral exploration drilling Parliament of Western Australia
Basic Gold Prospecting & Exploration Methods

of rig type, is that the drilling industry has made big changes in the design and layouts of all rig types to improve safety for the people working on these rigs, safeguard the envi-ronment, and improve the efficiency to minimize the time it takes to construct the well. Land rigs As mechanization made the hunt for hydrocarbons more ef-ficient, it had a direct effect on land rig design. The
The drilling program can involve one or more types of drilling, conditioned by the material to be sampled, rock environment, and the reason of the sampling. Basically, there are two types of drilling, one involves core drilling and the other one is reversed circulation.
Different Drilling Methods According To Surface Type – There are numerous type of drilling methods used in the construction industry. Each of the drilling method has its own characteristic structure applicable to certain type of surfaces.
02 Rock drilling methods and machinery – NFF med fagstoff
Directional drilling is defined as the practice of controlling the direction and deviation of a wellbore to a predetermined underground target or location. This section describes why directional drilling is required, the sort of well paths that are used, and the tools and methods employed to drill those wells.
WATER WELL DRILLING METHODS There are several different types of drilling methods used in Michigan. This section covers the most common methods used. Rotary Drilling Rotary drilling is the most popular well drilling method in Michigan. Mud rotary is widely used in the Lower Peninsula where substantial overburden exists, while air rotary rigs are found primarily in the Upper Peninsula and the

Offshore Oil Drilling The Conventional Method weSRCH
PPT – Drilling Methods PowerPoint presentation free to

Conventional wells. In the early days of the oil industry, drilling wells was a simple operation. A well location was picked at top reservoir, and the well was drilled directly down to the target as a vertical well.
3.2.6 Location Methods 3.2.7 Clamping 3.2.8 Drill Bushes 3.2.9 Jig Feet and Legs 3.2.10 Chip Control 3.3 Types of Jig and Examples 3.4 Summary 3.5 Key Words 3.1 INTRODUCTION Mass production targets on increasing productivity and increasing accuracy by reducing the setup cost and manual fatigue. One of the common practices to achieve the goals of mass production is to use jigs. Let us …
2.0 TYPES OF MICROPILES AND DRILLING METHODS 2.1 Micropile Classification Micropiles are generally classified firstly according to design application and grouting method. The design application dictates the function of the micropile while the grouting method defines the grout/grout bond capacity. In the design application, there are two general types of application. The first type is where the
Oil and gas exploration makes use of several types of drilling methods and platforms based on the type of formations, geographic location, soil type and the like.
The installation process and methods of pile foundations are equally important factors as of the design process. Pile foundation installation methods are by pile hammer and boring by mechanical auger. To avoid damages to the piles, during design, installation Methods and installation equipment
The drilling program can involve one or more types of drilling, conditioned by the material to be sampled, rock environment, and the reason of the sampling. Basically, there are two types of drilling, one involves core drilling and the other one is reversed circulation.
TYPES OF DRILLING MACHINES There are two types of drilling machines used by TC 9-524 Reaming, counterboring, and counter-sinking may require slower speeds than drilling …
Drilling is a cutting process that uses a drill bit to cut a hole of circular cross-section in solid materials. The drill bit is usually a rotary cutting tool, often multi-point.
The drilling rate by this method depends on type of subsurface formation penetrated and type of rig equipment used. Contrary to the cable tool method the rate of drilling by hydraulic rotary method does not depend upon the depth of the hole.

Review of Drilling Completion and Remediation Methods for
Methods of Installing Pile Foundations The Constructor

ROTARY DRILLING BITS This chapter covers the following items ¾ Roller cone bits ¾ The three cone bits • Principle features • Design factors • Rock bit classifications ¾ Poly diamond compact (PDC) bits ¾ Diamond bits ¾ Bit selection ¾ Bit dullness ¾ Well bit record and geological information Introduction ¾ Drilling bit represents the heart of drill string ¾ Proper selection is
The installation process and methods of pile foundations are equally important factors as of the design process. Pile foundation installation methods are by pile hammer and boring by mechanical auger. To avoid damages to the piles, during design, installation Methods and installation equipment
A different drill bit can be used for each sediment type. Above the water table, the borehole gen-erally stays open without the need for support. Below the water table a temporary PVC casing may be used to prevent the hole from col-lapsing, and can be emptied either with an auger or a bailer. The perma- …
Drilling. This article is about drilling in English language teaching, a technique that is still being used by many teachers although it has been discredited in modern methods.
Conventional wells. In the early days of the oil industry, drilling wells was a simple operation. A well location was picked at top reservoir, and the well was drilled directly down to the target as a vertical well.
Drilling can be comfortably and effectively incorporated into many types of lessons – whether you use a PPP model or a task-based approach, for example. Drilling may follow a language focus stage particularly if you are dealing with spoken language.
Drilling & Geology Resource presentation for exercises related to Storvola & Festningen Kjell Kåre Fjelde – UiS . Festningen Exercise •Solve an exercise that is focusing on elements to be considered when constructing a drilling program •Can also be found on the resource CD . Festningen exercise •Exercise handed out to each group in advance •Work with it during the excursion and
Four drilling methods are widely used, each depending on the type of information required and/or the rock types being drilled. Air-rotary drilling : this is a quick and economical method of …
Sonic Drilling – Sonic drilling is a safe, clean and low-impact drilling technique. Boreholes are drilled, cored and cased by rotating and vibrating the rod, core barrel and casing at resonant sonic frequencies. Sonic drilling generates considerably less drill spoils than auger, mud or air rotary methods, saving additional project resources.
The investigation program included drilling boreholes and collecting soil samples at desired intervals for subsequent observation and laboratory testing. The investigation program will consist of soil boring and sampling at desired intervals for subsequent observation and laboratory testing to determine the capacity of pile foundation economically and safely. 3.2 Boring and Sampling The

Drilling Methods Drilling Rig Oil Well Scribd
Construction Planning Equipment CHAPTER PILES AND PILE

Drilling is undertaken only in advanced mineral exploration and the most common drilling method is very similar to water bore drilling. This fact sheet explains the different exploration methods and equipment, how exploration is regulated, the potential impacts and how these can be managed. What is exploration? Exploration is the process of searching for deposits of minerals in the ground. The
Drilling can be comfortably and effectively incorporated into many types of lessons – whether you use a PPP model or a task-based approach, for example. Drilling may follow a language focus stage particularly if you are dealing with spoken language.
Drilling & Geology Resource presentation for exercises related to Storvola & Festningen Kjell Kåre Fjelde – UiS . Festningen Exercise •Solve an exercise that is focusing on elements to be considered when constructing a drilling program •Can also be found on the resource CD . Festningen exercise •Exercise handed out to each group in advance •Work with it during the excursion and
Sonic Drilling – Sonic drilling is a safe, clean and low-impact drilling technique. Boreholes are drilled, cored and cased by rotating and vibrating the rod, core barrel and casing at resonant sonic frequencies. Sonic drilling generates considerably less drill spoils than auger, mud or air rotary methods, saving additional project resources.
The installation process and methods of pile foundations are equally important factors as of the design process. Pile foundation installation methods are by pile hammer and boring by mechanical auger. To avoid damages to the piles, during design, installation Methods and installation equipment
Directional drilling is defined as the practice of controlling the direction and deviation of a wellbore to a predetermined underground target or location. This section describes why directional drilling is required, the sort of well paths that are used, and the tools and methods employed to drill those wells.
direct rotary method where drilling fluid is forced down the annulus between the drill stem and hole wall and recovered from the drill stem. This reverse type of drilling is a suction

Drilling & Geology folk.uio.no
PPT – Drilling Methods PowerPoint presentation free to

The selection of underground mining methods is primarily based on the geological/spatial setting of the deposit. Candidate methods can therefore be chosen and ranked based on estimated operational/capital costs, production rates, availability of labors and materials/equipments, and environmental considerations. The method offering the most reasonable and optimized combination …
PDF Drilling and blasting as a tunnel excavation method Blasting methods & cut types in tunnel excavations. 9. Tunnel excavation method. 10. Tunnelling accuracy. Ö.SATICI . 3. Hacettepe
types of rotary drilling methods are best classified by the type of drilling fluid used, and/or the way in which the fluid is circulated through the borehole.
Directional drilling is defined as the practice of controlling the direction and deviation of a wellbore to a predetermined underground target or location. This section describes why directional drilling is required, the sort of well paths that are used, and the tools and methods employed to drill those wells.
TYPES OF DRILLING MACHINES There are two types of drilling machines used by TC 9-524 Reaming, counterboring, and counter-sinking may require slower speeds than drilling …