- What will happen if center drill is not used before starting a drill?
- What will happen to the workpiece when turned if it is held between centers and the centers are not exactly in line?
- What is the difference between a live center and a dead center when these terms are used in the context of workholding in a lathe?
- How is the work mounted on centers?
- Why is top dead center important?
- What are the four types of tool post?
- Which of the following have live center?
- What stroke is top dead center?
- Why is it important to locate the center carefully?
- What is a lathe dog used for?
- What is the difference between rough turning and finish turning?
- Which of the following is not the part of the bed?
- What are the differences between live center and dead center?
- How do you use a dead center on a lathe?
- What does dead center mean?
- What is a dead center used for?
- What is top dead center?
- What is a live Centre lathe?
- What is a live tailstock?
What will happen if center drill is not used before starting a drill?
Without using a pre-center drill hole, the initial point of engagement is seated on the chisel edge.
The cutter may therefore slip on the workpiece and consequently angular drill holes may be generated.
In addition, tool break may be observed in the case of using brittle cutters (such as WC)..
What will happen to the workpiece when turned if it is held between centers and the centers are not exactly in line?
What will happen to the workpiece when turned, if held between centers, & the centers are not exactly in line? it will lead to tapered surfaces rather than cylindrical surfaces. there will be uneven contact between the workpiece and the cutting tool.
What is the difference between a live center and a dead center when these terms are used in the context of workholding in a lathe?
What is the difference between a live center and a dead center, when these terms are used in the context of work holding in a lathe? … The centers you refer to are used in the tailstock of a lathe to support the free end of a workpiece. The other end is clamped in the chuck.
How is the work mounted on centers?
CENTERING THE WORK. To center round stock where the ends are to be turned and must be concentric with the unturned body, mount the work on the head spindle in a universal chuck or a draw-in collet chuck If the work is long and too large to pass through the spindle, use a center rest to support one end.
Why is top dead center important?
Finding Top Dead Center (TDC) is an essential skill for assembling and tuning engines; and is even a necessity for performing some engine diagnostic tests, such as a cylinder leak down test.
What are the four types of tool post?
Lathe Machine Tool Post and it TypesQuick Release Tool Post.Index Tool Post.Pillar Type Tool Post.Clamp Type Tool Post.Turret (4-Way) Tool Post.Super Six Index Turret 1. Quick Release Tool Post This tool post is currently gradually more used. An infinite number of tools conduct is preset in the holders prepared for use.
Which of the following have live center?
Which of the following have a live centre? Explanation: Head stock has live centre and it is called live because spindle rotates here and is not at rest during machining.
What stroke is top dead center?
four-strokeThere are many reasons why you might need to find an engine’s top dead center. Top dead center is the point when the piston of the number one cylinder in an engine is at its highest point, and on the compression stroke of the engine’s four-stroke cycle.
Why is it important to locate the center carefully?
It is very important that the work to be turned is carefully centered. If this is not done then a big chip will be removed from one side of the diameter and a small chip from the opposite. This unevenness of cut takes more time and may cause inaccuracy.
What is a lathe dog used for?
Lathe Dog is also widely known as Lathe Carrier. It is a device made up of Iron Cast that is used to provide a firm connection between the workpiece and headstock spindle mounted between the centre. It clamps around the workpiece and allows the machine spindle rotary motion to be transmitted to the workpiece.
What is the difference between rough turning and finish turning?
A roughing operation is used to remove large amounts of material rapidly and to produce a part geometry close to the desired shape. A finishing operation follows roughing and is used to achieve the final geometry and surface finish.
Which of the following is not the part of the bed?
4. Which of the following is not the part of the bed? Explanation: All are the part of the bed. Tailstock is a sliding unit on the bed-ways of the lathe bed.
What are the differences between live center and dead center?
To put it simply a dead center is just that – dead. It has no moving parts. It is really nothing more than a metal shaft with a point. A live center is similar, but the shaft has a bearing that allows it to turn.
How do you use a dead center on a lathe?
The proper use or method to use both DEAD and LIVE Centers is when turning a part between centers. Remove the chuck from the lathe and insert a DEAD CENTER in the SPINDLE NOSE. Use the LIVE CENTER in the TAILSTOCK.
What does dead center mean?
The dead center is the position of an engine’s piston when it is at the very top or bottom of its stroke. The maximum travel of the piston between the two dead centers is the stroke.
What is a dead center used for?
A dead center (one that does not turn freely, i.e., dead) may be used to support the workpiece at either the fixed or rotating end of the machine. When used in the fixed position, a dead center produces friction between the workpiece and center, due to the rotation of the workpiece.
What is top dead center?
Definition of ‘top dead center’ Top dead center is the position of an engine’s piston when it is at the very top of its stroke. The piston has moved up towards the top dead center. The piston is said to be at top dead center when it has moved to a position where the cylinder volume is a minimum.
What is a live Centre lathe?
Strictly; a “Live Centre” is the one in the Headstock Spindle, when you are turning “between centres” in an engineering or woodturning lathe. Watchmakers also turn between a pair of dead centres, and drive the work directly with a bow. [This is a simlar idea to the old “Bodger’s” Pole Lathe.]
What is a live tailstock?
A tailstock, also known as a foot stock, is a device often used as part of an engineering lathe, wood-turning lathe, or used in conjunction with a rotary table on a milling machine. … A tailstock has a Dead Center, while headstock has Live Center.