In this method, either cutting tool or worktable moves from one point to the required other point
as per requirement.
Straight line system
In this system, provision is made to machine the workpiece along straight line like
milling and turning.
Countering system
this system generates a continously controlled motion of the tool 2.Based on positioning co-ordinates:
Absolute system
In this system, the coordinates of any point are always taken from a fixed pont or workpiece zero.
fixed point is generally the south west corner of workpiece
Incremental system
In this system, reference point is not fixed but it varies with respect to previous point.
In this system, the coordinates of any poinnts is calculated with reference to the previous position of the tool
CNCSimulator Pro is a contemporary and advanced yet easy to use full
3D CNC simulation system with a virtual CNC controller and various
machines as well as the integrated CAM system SimCam.It is free for one
month. then you have to purchase it.
but you can use its free version also but there is limitation in
machine. You can access only two machine which are mill and lathe. Here
you can make any program just using drawing and some instruction. so you
don’t need to type the whole program.
it is very useful for trainees
Download it from here:http://cncsimulator.info/download
Hello, Guys. These is Mr.Expert here. Today I am gonna showing you everything about
CNC Machines.
Computer numerical control (CNC) is the automation of machine tools by
means of computers executing pre-programmed sequences of machine control
commands. This is in contrast to machines that are manually controlled by
levers, or mechanically automated by cams alone. In modern CNC systems, the design of a
mechanical part and its manufacturing program is highly automated. The part's
mechanical dimensions are defined using CAD software, and then translated into
manufacturing directives by CAM software. The resulting directives are
transformed (by "post processor" software) into the specific commands
necessary for a particular machine to produce the component, and then loaded
into the CNC machine. The first NC machines were built in the 1940s
and 1950s, based on existing tools that were modified with motors that moved
the controls to follow points fed into the system on Punched Tape. This early
servomechanism were rapidly augmented with analog and digital computers,
creating the modern CNC machine tools that have revolutionized machining processes. Motion is controlled along multiple axes,
normally at least two (X and Y), and a tool spindle that moves in the Z
(depth). The position of the tool is driven by direct-drive stepper motor or servo
motors in order to provide highly accurate movements, or in older designs,
motors through a series of step down gears. Open-loop control works as long as
the forces are kept small enough and speeds are not too great. On commercial metalworking
machines, closed loop controls are standard and required in order to provide
the accuracy, speed, and repeatability demanded. As the controller hardware evolved, the mills
themselves also evolved. One change has been to enclose the entire mechanism in
a large box as a safety measure, often with additional safety interlocks to
ensure the operator is far enough from the working piece for safe operation.
Most new CNC systems built today are 100% electronically controlled. CNC-like systems are now used for any process
that can be described as a series of movements and operations. These include laser
cutting, welding, friction stir welding, ultrasonic welding, flame and plasma
cutting, bending, spinning, hole-punching, pinning, gluing, fabric cutting,
sewing, tape and fiber placement, routing, picking and placing, and sawing.
