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About our project

This project aims at designing and producing a CNC laser engraving machine. Three different alternative designs have been done and the best one was chosen. The calculations for building a CNC laser engraving machine are based on an effective working area of 300x300 mm 2 . Detail drawings and assembly drawing were done for the chosen design. The project was manufactured and tested to engrave on wood, plastics, leather and metals. A web blog containing project activities have been created. The project cost was 2630 S.R.
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Results

After testing the machine, we were able to engrave with very high quality on wood, plastics and leather. We were also able to test the machine engraving on metals and it gave a remarkable result.

Proximity sensor

A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact. A proximity sensor often emits an electromagnetic field or a beam of electromagnetic radiation (infrared, for instance), and looks for changes in the field or return signal. The object being sensed is often referred to as the proximity sensor's target. Different proximity sensor targets demand different sensors. For example, a capacitive proximity sensor or photoelectric sensor might be suitable for a plastic target; an inductive proximity sensor always requires a metal target. The maximum distance that this sensor can detect is defined "nominal range". Some sensors have adjustments of the nominal range or means to report a graduated detection distance. Some know these processes as "thermos sensation". Proximity sensors can have a high reliability and long functional life because of the absence of mech...

Types of Laser

Depending on the nature of the active media, lasers are classified into three main categories, solid, liquid, and gas. ·          Solid Laser(Diode): is an optically clear material composed of a crystal and an impurity dopant.   The output wavelength is determined for the most part by the impurity.   Examples:   Ruby laser. ·         Gas Laser : are very much like fluorescent light sources.   An electric current pass through the optical cavity exciting atoms, resulting in the emission of light.   Examples: CO2. ·          Liquid Laser: liquids are more homogeneous as compared to solids and have larger density of active atoms as compared to the gasses. [27] Main Component of Laser: ·          Lasing Medium. ·          Pump Source. ·    ...

G-code example

The following G-code is used to make the head of the CNC machine follow the shown path in the figure O1000 T1 M6 G0 G90 G40 G21 G17 G94 G80 G54 X-75 Y-25 S500 M3 (Start Point) G43 Z100 H1 Z5 G1 Z-20 F100 X-50 M8 (Position 1) Y0 (Position 2) X0 Y50 (Position 3) X50 Y0 (Position 4) X0 Y-50 (Position 5) X-50 Y0 (Position 6) Y25 (Position 7) X-75 (Position 8) G0 Z100 M30

G-code

G-code is a language in which people tell computerized machine tools how to make something. The "how" is defined by g-code instructions provided to a machine controller (industrial computer) that tells the motors where to move, how fast to move, and what path to follow. The most common situation is that, within a machine tool, a cutting tool is moved according to these instructions through a toolpath and cuts away material to leave only the finished work-piece. Industry has standardized on G-Code as its basic set of CNC machine codes. G-Code is the most popular programming language used for programming CNC machinery. Some G words alter the state of the machine so that it changes from cutting straight lines to cutting arcs. Other G words cause the interpretation of numbers as millimeters rather than inches. Some G words set or remove tool length or diameter offsets. Below is a complete listing of G-codes.  G-Code Description G00 Rapid Linear Interp...