Radial Drilling Machine Parts And Functions PdfBy Caterina A. In and pdf 30.11.2020 at 10:06 5 min read
File Name: radial drilling machine parts and functions .zip
The drilling machine is one of the most important machines in a workshop. In drilling machine holes are drilled quickly and at a low cost. Its parts , operations , tools and types of drilling machine with PDF.
- Radial Drilling Machine and Parts
- Drilling machine – Parts, Types, Operations and More with PDF
- Advantages of the Radial Drilling Machine
The radial drilling machine is intended for drilling medium to large and heavy work pieces. The machine consists of a heavy, round, vertical column mounted on a large base.
A radial drilling machine or radial arm press is a geared drill head that is mounted on an arm assembly that can be moved around to the extent of its arm reach. The most important components are the arm, column, and the drill head. The drill head of the radial drilling machine can be moved, adjusted in height, and rotated. Aside from its compact design, the radial drill press is capable of positioning its drill head to the work piece through this radial arm mechanism. This is probably one of the reasons why more machinists prefer using this type of drilling machine.
Radial Drilling Machine and Parts
The drilling machine is one of the most important machines in a workshop. In drilling machine holes are drilled quickly and at a low cost. Its parts , operations , tools and types of drilling machine with PDF. The drilling machine is defined as a machine which is used to make a circular hole, a tool used to drill the holes of different size and other related operations using a drill bit. As regards its importance it is second only to the lathe machines. Holes were drilled by the Egyptians in B.
The bow drill is the mother of present-day metal cutting drilling machine. In drilling machine holes may be drilled quickly and at a low cost. The hole is generated by the rotating edge of a cutting tool known as the drill which applies a large force on the work clamped on the table. The base is that part of the machine on which the verticle column is mounted. The base is made of casting.
A base supports the column and worktable with other attachments. The top of the base is round column section type upright drilling machined and has T-slots on it so that large workpieces and work holding devices may be set up and bolted to it. The base of the machine may be mounted on a bench or on the floor. The Column is the verticle member of the machine which supports the table and the head containing all the driving mechanism. It is a cylindrical casting mounted vertically at one end of the base and supports the radial arm, which slides up and down.
An electric motor at the top of the column helps in the vertical adjustment of the arm by rotating a screw passing through a nut attached to the arm. The table is mounted on the column and is provided with T-slots for clamping the work directly on its face. A table is round or rectangular in shape. It is mounted on the column and extends horizontally over the base. It has guideways on which drill head slides. The radial arm moves around the column.
It is mounted on the redial arm and drives the drill spindle. In some of the drill machines, the drill head may be adjusted up or down for accommodating different heights of the work in addition to the table adjustment. It encloses all the mechanism for driving the drill at a different speed and feeds. In lighter machines, the driving motor is mounted at the rear end of the head counterbalancing the weight of the drill spindle.
The motor at the top of the drill head drives the horizontal spindle and the motion is transmitted to the drill head through a group of bevel gears. With another group of gears, different spindle speed and feed are obtained.
The main advantage of this types of drilling machine is that holes of variable sizes at any point and at any angles can be drilled on the large-sized workpiece without moving the workpiece. These types of a drilling machine are commonly used in all the workshops. Used to drill small sized holes. It is operated by holding in a hand. The workpiece where the hole is to be drilled is held in a vice. This types of drilling machine used to drill small holes at high speeds in lighter jobs or workpieces.
Hand-feed permits the operator to sense the progress of the drill into the workpiece, so that if there is any drill worn out or jams it may be released immediately to prevent the drill bit from breaking. Since the operator senses the cutting action at any instant it is called as the sensitive drilling machine. These machines are capable of drilling small holes of diameter as small as 0.
These machines run at a higher speed as high as rpm. It is larger in size and stronger than sensitive drilling machine. It is used for drilling medium and large-sized holes. Based on the type of column used it is classified as a round column and box column upright drilling machines. It consists of the base, column radial arm, drill head, spindle speed and feed mechanism. The space between drill spindles is varied to suit the gap between the holes. This type of machine tool is used to drill a large number of holes in the same job at a faster rate.
The main advantage of this type of machine tool is that the series of operation can be performed with different spindle mounted with different tool bits on the same workpiece by moving it from one position to another position. This machine tool is similar to a gang drilling machine in construction.
It is used to drill the number of hole in the same workpiece simultaneously and to reproduce the same work in a number of similar jobs. All the spindle are driven by a single motor and fed continuously.
During the feeding table with the workpiece is raised or lowered and the drill head position is not varied. This types of drilling machine can perform a series of machining operations at successive units and transfer the work from one unit to the other automatically. Once the work is loaded at the first machine, the work will move from one machine to the other where different operations can be performed and the finished work comes out from the last unit without any manual handling.
This type of machine is intended purely for production purposes and may be used for milling, honing and similar operations in addition to drilling and tapping. This may be the either horizontal or vertical type of machine. In this drilling machine, the part to be drilled is rotated and the drill bit that makes the hole is kept stationary. Deep hole drilling is done in components like rifle barrels, crankshafts, long shafts etc. Drill: A drill is a fluted cutting tool used to originated or enlarge a hole in a solid material.
Drills are manufactured in a wide variety of types and sizes. A flat drill is sometimes used when the same sized twist drill is not available.
It is usually made from a piece of round tool steel which is forged to shape and ground to size, then hardened and tempered. The cutting angle varies from 90 to and the relief or clearance at the cutting edge is 3to 8.
The disadvantage of this type of drill is that each time the drill id ground the diameter is reduced. Further, it cannot be relied upon to drill a true straight hole, since the point of the drill has a tendency to run out of a centre.
Another difficulty of using this type of drill is that the chips do not come out from the hole automatically, but tends to pack more or less tightly, if deep holes are to be drilled. A straight-fluted drill has grooves or flutes running parallel to the drill axis. A straight-fluted drill may be considered as a cutting tool having zero rakes.
This type of drill is inconvenient in standard practice as the chips do not come out from the hole automatically. It is mainly used in drilling brass, copper or other softer materials. In drilling brass, the twist drill tends to advance faster than the rated feed and the drill digs into the metal. No such difficulty occurs in the use of a straight fluted drill. When drilling sheet metal, the straight fluted drill does not tend to lift the sheet as does the twist drill.
This is the most common type of drill used today is the twist drill. It was originally manufactured by twisting a flat piece of tool steel longitudinally for several revolutions, then grinding the diameter and the point. The present-day twist drills are made by machining two spiral flutes or grooves that run lengthwise around the body of the drill. The twist drill is an end cutting tool. Different types of twist drills are classified by Indian standard Institution according to the type of the shank, length of the flute and overall length of the drill.
The drill has two helical flutes with a parallel shank of approximately the same diameter as the cutting end.
The diameter of the drill ranges from 02 to 16 mm increasing by 02 to 03 mm in lower series to mm in higher series. Fig 5. The drill is a shortened form of the parallel shank twist drill, the shortening being on the flute length. The diameter of the drill ranges from 05 to 40 mm increasing by 03 mm in lower series to to 05 mm in higher series. The drill has two helical flutes with a parallel shank of approximately the shank diameter as the cutting end, which however does not exceed the diameter at the drill point.
The overall length of the drill is the same as that of a taper shank twist drill of the corresponding diameter. The diameter varies from to 26mm increasing by mm in lower series to mm in higher series.
The drills have two helical flutes with a tapered shank for holding and driving the drill. The shank for these drills conforms to Morse tapers. The diameter ranges from 3 to mm. The diameter increases by mm in lowest series having Morse taper shank No. The use of Morse taper shank below 6mm size is not preferred. A drill gauge enables any drill to be readily selected by gauge. These drills are intended for enlarging cored, punched or drilled holes. These drills cannot originate a hole in a solid material because the cutting edges do not extend to the centre of the drill.
The metal is removed by a chamfered edge at the end of each flute. Cored drills produce better-finished holes than those cut by ordinary two fluted drills. The cutting action of a core drill is similar to that of a rose reamer and it is often used as a roughing reamer. In some cases, a two fluted twist drill is chosen to originate a hole half the required size and the rest is finished by a three or four fluted drills. The oil tube drills are used for drilling deep holes.
Oil tubes run lengthwise spirally through the body to carry oil directly to the cutting edges. Cutting fluid or compressed air is forced through the hoes to the cutting point of the drill to remove the chips, cool the cutting edge and lubricate the machined surface. The centre drills are a straight shank, two fluted twist drills used when centre holes are drilled on the ends of a shaft.
Drilling machine – Parts, Types, Operations and More with PDF
The machine consists of a heavy, round, vertical column mounted on a large base. The column supports a radial arm which can be raised and lowered to accommodate workpieces of different heights. The arm may be swung around to any position over the work bed. The drill head containig mechanism for rotating and feeding the drill is mounted on a radial arm and can be moved horizontally on the guide ways and clamped at any desired position. These three movements in a radial drilling machine when combined together permit the drill to be located at any desired point on a large workpiece to drill the hole. Machine Parts 1.
Drilling Machine PDF:Radial Drilling Machine, Types, Working Principle,Parts, Mechanism. Drilling Machine: It is a machine which is used to drill the holes on.
Advantages of the Radial Drilling Machine
The Swivel table can move up and down by means of rotational motion and can be locked to the column by means of locking nut. It consists of motor, stepped pulley, V-belt and the Spindle. The power transmission is explained in the working of the drilling machine. By the rotation of hand-wheel, the spindle moves up and down in the vertical direction in order to give the necessary amount of feed to the work. Here, the rotational motion is converted into linear motion by means of a Rack and Pinion mechanism which was explained below.
Drilling Machine is used to make circular holes on the components with the help of Drill bits. Radial Drilling Machine is used to drill the holes in the given radial distance when the component size is larger in terms of height with respect to the work table. When the component is large, it cannot fit its structure in the Machine vice. Therefore, the component has to be placed on the ground and the Radial arm of the drilling machine has to be rotated with respect to the component to do the operation. It is made up of Cast Iron which possesses high compressive strength and good wear resistance.
In the last class, we had discussed the Milling Machine and its operations in a detailed way whereas, in today's article, we will discuss the concepts of Drilling Machin ing along with its parts, working principle advantages, disadvantages, and applications. It is a machine which is used to drill the holes on the components or workpiece with the help of drill bits.
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