Thursday, 23 February 2017

Machine tools machinability and calculations

Machining is achieved by knowing the machine parts, feed rates and the proper speeds based on the rigidity of the workpiece as well as cutting tool. Turning process works to remove material from the rotating workpiece surface and reducing its diameter for each spindle revolution or rpm, this operation could be taper turning, form turning, and contour turning, drilling, knurling, threading or boring.

Spindle speed is calculated as rpm= (CS*320)/D where rpm represents revolutions per minute of the cutter or workpiece, CS=cutting speed, D=diameter
Feed rate is the multiplication of calculated speed, number of teeth of the cutter and chip load(feed per tooth).
Feed per tooth=feed/(spindle speed*number of flutes)
Straight cut depth when cutting threads on the lathe=0.6134*pitch

Range of feed per revolution for roughing on a lathe machine:
Work material
High speed steel
carbide
Inches
millimetres
inches
millimetres
Mild steel
0.010-0.020
0.25-0.5
0.015-0.035
0.4-0.9
Tool steel
0.010-0.020
0.25-0.5
0.015-0.035
0.25-09
Cast iron
0.015-0.025
0.4-0.65
0.015-0.030
0.4-0.75
aluminum
0.015-0.030
0.4-0.75
0.015-0.035
0.4-0.9
brass
0.015-0.025
0.4-0.65
0.015-0.030
0.4-0.75

Other operations are:
About boring machining, cutting is performed inside the material either horizontal or vertical.
Milling machine allows work part to be fed past a rotating tool with edges.
Further, hacksaw machine is used for linear reciprocating motion while bandsaw helps with linear continuous motion.
Finishing improves the product appearance could be done with filing.
Knurling helps to form ridges increasing the diameter of the workpiece unto 0.030 inch and this process should be performed with high feed rate and at low spindle speed.
Grinding produces required sizes with fine finishing.

Durable and reliable metalworking machines as follows
Lathe Machine
Drilling Machine
Bandsaw Machine 



Friday, 10 February 2017

Basic comparison between Stainless steel and carbon steel metals

Stainless steel alloy with a base 10.5% chromium content by weight is an outstanding metal for its erosion resistance property, and it is broadly used for sustenance taking care of and cutlery among numerous different applications. Stainless steel does not promptly corrode, rust or stain with water as customary steel does. Notwithstanding, it is not completely stain proof in low-oxygen, high-saltiness, or poor air-flow situations. There are different evaluations and surface compositions of stainless steel to suit the environment the combination must persevere. Stainless steel is utilized where both the attributes of steel and consumption resistance are required.
Stainless steel contrasts from carbon steel by the measure of chromium substance. Carbon steel is made out of iron and carbon level shifts between 0.12 – 2.1%. The 300 arrangement of stainless steel evaluations is unaffected by any of the frail bases, for example, ammonium hydroxide, even in high concentrations and at high temperatures. High oxidation resistance in air at surrounding temperature is commonly accomplished with expansion of at least 13% (by mass) chromium, and up to 26% is used for harsh situations. Also, stainless steel is non-brittle and milder however carbon steel is fragile and in addition hard and wear-safe. Be that as it may subject to a destructive domain, stainless steel may really be the best choice with superior mechanical chemical composition of materials for some fields, for example, in structures, landmarks, car, and machinery and so on.
To conclude, the group of stainless steels incorporates materials that are hard and delicate, solid and powerless, adaptable and unbending, and cost focused and amazingly costly. So does the series of carbon steels. Rather, you have to opt for in the view of the individual plan criteria required by every area of its usage.

Wednesday, 1 February 2017

How to replace a Miter Saw Blade quickly with safety?

The substitution of the miter saw blade is an occasionally tool safeguarding process.In fact, it is a easy and effortless act only requiring a couple of tools as an Allen wrench, a screw driver, possibly a piece of scrap wood.  The change of the miter saw blade first involve a number of common safety measures. The saw needs to be turned off and unplugged the equipment from the socket. Before operating on any power tool, make sure that it is not viable for the tool to turn on. As it is always risky to secure a blade, just remain alerted on the job that needs to be finished.

miter saw blade
First, the blade guard has to be removed, so fully pull up the guard to achieve access to the screw holding the miter saw to the guard and unscrew it. Leave go of the screw to slide further backward the blade guard. Point it around 170 degrees at the back compared to its original position, revealing thus the blade bolt and spindle lock of the miter saw.  Press down the locking pin of the saw and rotate the blade till it is locked properly. Next remove the blade bolt with an Allen wrench to loosen it. In most cases, the blade bolt is turned clockwise, but that is not always the case. So, attempt to locate a sign on the tool for the accurate direction to lose the bolt or just test the saws with your finger in advance. Take away the flange and change the blade with the new blade. Change the flange along with the blade bolt, double checking that you have securely tightened the bolt with the allen wrench but not overly. Glide forward the blade guard and fasten the screw very well which keeps it to the miter saw equipment in place. Put back the guard to its usual position using a screwdriver and reengage the tool. Check the right working order of the miter saw by producing cuts to make sure the cutting as clean and even. It is quick and simple to replace a miter saw blade, but it should be done with care and by taking clearer safety instructions. It is significant to always have a well maintained and pointed blade as it is considerably improve your work grades along with your safety.
Some other popular saws include Power Hacksaw machine to cut plastic or hard metal like stainless steel with its fine teeth or blade held straight. Another general purpose machine is metal working bandsaw machine provide rigidity to cut precisely often used with miterboxes.

Wednesday, 25 January 2017

The Main Industrial Applications of Lathe Machine

The lathe machine is one of the most important parts in tool room equipment. A lathe machine basically revolves the work on its axis for executing a wide range of functions which includes cutting, drilling, deforming, facing, knurling, sanding, turning. This all rounder machine enables the user to produce same objects using wood, metal, plastic etc. over the period of time, developments in technology helped to introduce various types of lathe machines to meet the diverse needs of several industrial segments.

Today lathe machines are commonly used for wood turning, metal working, metal spinning, thermal spraying, and shaping machine components. The metal working lathes are widely utilized for producing a variety of solid metal products. The work piece is usually held tightly in place by either one or two centers that can be moved horizontally to fit materials of various metal products. The work piece is usually held tight in place by either one or two centers that can be moved horizontally to accommodate materials of various dimensions.

Heavy duty lathe machine is ideal for turning objects made from very hard materials. It is built using superior quality, sturdy and rust free materials and incorporates the most modern technology. These machines are low noise and highly precise lathe machines deliver flawless output. They are mainly utilized for top grade machining work, and large scale metal and wood working tasks in numerous industrial sectors such as mining, paper, power plant, and shipping.

The work piece can be rotated on the lathe machine is determined by the diameter of the work piece it will turn and the length of bed. Lathes that can be turn average sized objects, while large lathes are used for turning work pieces that have a large diameter. The popular lathe machines for industrial applications include all geared, light duty, medium duty, and heavy duty lathe machines. The light duty of lathe machines is particularly used for precisely shaping or deforming small objects. The highly versatile and long lasting equipment is commonly found in work-shops and tool rooms. The robust structure and high speeds.

Monday, 23 January 2017

Different Types of Lathe Machines

 
As we all know lathe machines are used for wood turning, metal-working, metal spinning, thermal spraying, parts reclamation and glass working. Lathes can be used to shape pottery, in best designing is known as potter wheel. Most suitable lathe working can also be used to produce most solids of revolution, plane surfaces and screw thread of helices. Other work holding methods include clamping the work about the axis of rotation using a chuck or collet or to a faceplate, using clamps or dogs. Mainly types of lathe machines include: - Speed lathes, Engine Lathes, Tool room lathes and Turret lathes.

Simple Lathes are designed simple. It contains a head-stock, tail stock and a very simple tool post. It can operate in 3-4 speeds. Its spindle speed is very high. It is used for light machine work like wood turning, metal spinning and metal polishing.

Engine lathes are the one of the common type of lathe machine. It is designed for low power operations as well as high power operations. Various lengths of machines are available. These machines can operate at a wide range of speed ratios.

Tool room lathes are versatile lathe machine. It can give better accuracy and finishing. It has a wider range of speeds and different types of feeds. It can be a great device to manufacture die.

Turret lathes are machines used for quick operations. It has various types of tool posts mounted on a single structure. As a number of tools are set up on a machine, the job can be completed very quickly with the single set-up. A capstan wheel is used to position on the next tool. A machining process can be done by using the turret lathe without moving the work-piece.