24-09-2016, 02:49 PM
1456110618-SYNOPSIS1.doc (Size: 338 KB / Downloads: 8)
Our Project ‘AUTOMATIC BOLT&NUT REMOVER AND FITTER’ Is useful for removing the Nuts From Bolts to Separate the Parts Nuts can be made of a variety of material and can require replacement from time to time. Eventually good ole wear and tear may leave the strings sitting too close to the first fret which can result in an open string buzz. Wear may also cause the string to become pinched within the nut slot and cause string binding (which has a noticeable pinging sound when tuning) and tuning problems.
The nut may also require replacement when performing a refract, especially if the action was nice and low beforehand. New frets are often higher than those they replace and that place the strings closer to the frets especially near the nut.
PRINCIPLE OF OPERATION
The supporting Plate Contains Four Nut Holders at a time use can remove four nuts simultaneously, The Nuts are fixed into the Holder, and the holder is rotated by a D.C Motor The D.C motor rotates in both direction –clock wise &anti clock wise .
The DC Motor is driven by the battery power. This power is transmitted & Controlled by a two way Switch –This Switch Contends the rotation of the motor in Clock wise direction This for enable the nut to removing at fritting on the bolt.
Thus this Machine Works effectively to remove the nuts and fitting the nuts.
ADVANTAGES:
Portable
Less Weight
Easy to operation
Easy to Maintenance
Simple in Construction
Less Manufacturing Cost
LIMITATION:
Battery charging in difficult
Lesser power to remove the nuts
D.C MOTOR:
In any electric motor, operation is based on simple electromagnetism. A Current
carrying conductor generates a magnetic field; when this is then placed in an external magnetic field, it will experience a force proportional to the current in the conductor, and to the strength of the external magnetic field. As you are well aware of from playing with magnets as a kid, opposite (North and South) polarities attract, while like polarities (North and North, South and South) repel. The internal configuration of a DC motor is designed to harness the magnetic interaction between a current-carrying conductor and an external magnetic field to generate rotational motion.
Let's start by looking at a simple 2-pole DC electric motor (here red represents a magnet or winding with a "North" polarization, while green represents a magnet or winding with a "South" polarization).
Every DC motor has six basic parts -- axle, rotor (a.k.a., armature), stator, commutator, field magnet(s), and brushes. In most common DC motors (and all that BEAMers will see), the external magnetic field is produced by high-strength permanent magnets1. The stator is the stationary part of the motor -- this includes the motor casing, as well as two or more permanent magnet pole pieces. The rotor (together with the axle and attached commutator) rotate with respect to the stator. The rotor consists of windings (generally on a core), the windings being electrically connected to the commutator. The above diagram shows a common motor layout -- with the rotor inside the stator (field) magnets.
The geometry of the brushes, commutator contacts, and rotor windings are such that when power is applied, the polarities of the energized winding and the stator magnet(s) are misaligned, and the rotor will rotate until it is almost aligned with the stator's field magnets. As the rotor reaches alignment, the brushes move to the next commutator contacts, and energize the next winding. Given our example two-pole motor, the rotation reverses the direction of current through the rotor winding, leading to a "flip" of the rotor's magnetic field, driving it to continue rotating.
In real life, though, DC motors will always have more than two poles (three is a very common number). In particular, this avoids "dead spots" in the commutator. You can imagine how with our example two-pole motor, if the rotor is exactly at the middle of its rotation (perfectly aligned with the field magnets), it will get "stuck" there. Meanwhile, with a two-pole motor, there is a moment where the commutator shorts out the power supply (i.e., both brushes touch both commutator contacts simultaneously). This would be bad for the power supply, waste energy, and damage motor components as well. Yet another disadvantage of such a simple motor is that it would exhibit a high amount of torque "ripple" (the amount of torque it could produce is cyclic with the position of the rotor).
PARTS DESCRIPTION
BATTERY:
The principle of the lead acid cell can be demonstrated with simple sheet lead plates for the two electrodes. However such a construction would only produce around an amp for roughly postcard sized plates, and it would not produce such a current for more than a few minutes.
Gaston Planté realised that a plate construction was required that gave a much larger effective surface area. Planté's method of producing the plates has been largely unchanged and is still used in stationary applications.
The Faure pasted-plate construction is typical of automotive batteries. Each plate consists of a rectangular lead grid alloyed with antimony or calcium to improve the mechanical characteristics. The holes of the grid are filled with a mixture of red lead and 33% dilute sulphuric acid (Different manufacturers have modified the mixture). The paste is pressed into the holes in the plates which are slightly tapered on both sides to assist in retention of the paste. This porous paste allows the acid to react with the lead inside the plate, increasing the surface area many fold. At this stage the positive and negative plates are similar, however expanders and additives vary their internal chemistry to assist in operation when in use. Once dry, the plates are then stacked together with suitable separators and inserted in the battery container. An odd number of plates is usually used, with one more negative plate than positive. Each alternate plate is connected together. After the acid has been added to the cell, the cell is given its first forming charge. The positive plates gradually turn the chocolate brown color of lead dioxide, and the negative turn the slate gray of 'spongy' lead. Such a cell is ready to be used.