Laser trimming is a manufacturing process that uses a laser to modify the operating parameters of an electronic component or a circuit by reducing the quantity of the component’s material incrementally.
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A typical application of laser trimming is in adjusting the resistance of an unnecessary thin-firm or thick-film resistor by cutting away a smaller proportion of the resisting material.
This trim or cut increases the resistance of a component by narrowing or expanding the resistive material’s current path. Measuring the active resistance value of the material resistor while the trimming process continues is an accurate way of establishing the final results.
Besides, specific capacitors can be accurately laser trimmed to achieve an accurate capacitive. This is usually achieved by removing the upper layer on a multilayer capacitor to decrease its capacitance by reducing the top electrode area.
Laser trimming technology has many applications such as cutting metal plates. It also makes it possible to cut tiny holes and intricate shapes.
The laser trim process on stainless steel, mild steel, and aluminum plate is accurate, yields accurate cut quality, and produces a small heat affect zone and a small kerf width.
The laser beam comprises a column of highly intense light of a mono color or wavelength. For instance, of the CO2 laser, the wavelength is part of the Infra-Red light spectrum, thus making it invisible to the naked human eye.
The beam is about ¾ inch in its diameter as it passes from the resonator, emitting it through the beam path. The beam can be bounced in various directions using several mirrors and beam benders before focusing on a plate.
The focused laser beam passes through a nozzle before it hits the plate. Also, it flows through the nozzle right before it comes into contact with the plate. Besides, compressed gas also flows through the nozzle, for instance, Nitrogen or Oxygen.
A unique lens is used to focus the beam or even a curved mirror, which happens in the laser cutting gear head.
The beam is accurately concentrated such that the shape of the focus spot and the energy density around the spot is precisely round, centered from the nozzle, and consistent.
When a giant laser beam is focused down a single pinpoint, the heat density generated is exceptionally high. Take, for example, using a magnifying glass to concentrate the sun’s rays on a single tip of a reef to start a fire.
Now consider focusing over 6 KWatts of energy onto a single spot and how the spot becomes. The extreme power density causes rapid heating, melting, melting, and complete or partial vaporization of the heated material.
When trimming mild steel, the laser beam heat is enough to create a standard oxy-fuel heating process since the laser cutting gas is pure oxygen, just like any other oxy-fuel torch.
When trimming aluminum or stainless steel, the laser beam is used to melt the material while the laser cutting gas blows off the molten metal pieces of the kerf. When cutting using a CNC laser cutter, the laser beam source/ head is adjusted over the metal being cut, thus achieving the desired cut shape.
Typically, a capacitive height is used to control the system such that a very accurate distance is maintained between the plate being worked upon and the nozzle end.
This distance is equally important since it determines the focal point of the plate surface. Raising or lowering the focal point from above the plate surface greatly impacts the cut quality.
Other parameters that can affect the cut quality, such as a stable laser bean, reliable and extremely accurate cutting process, are properly controlled.
Laser trimming can be done in two ways: Active and Passive. Passive trimming involves adjusting a single component such as a capacitor or a resistor to a specific value.
If the trimming changes the entire circuit output, such as its frequency, voltage, or attenuation, this is described as an active trim. During the trimming process, the circuit output performance is actively monitored.
Once the desired output is achieved, the trimming process is automatically shut off. The process variability arises from the laser power based on the component level, laser spot size, wavelength, or pulse duration of the laser emitter.
Electrical contact is required to the component circuit to ensure feedback measurement in both active and passive trim. This is usually done through a dedicated probe card that uses either pressure pins or spring blades.
One advantage of laser trimming over mechanical cutting is that it has an easier work holding and reduced contamination of your workpiece( no cutting edges get contaminated by the resulting cut material.
Precision cuts and High accuracy. This is because the cutting laser beam doesn’t degrade during the cutting process. Besides, laser trimming uses a very powerful laser and extremely small laser, focusing the beam of light on the material’s surface.
No need to modify or replace tooling gears hence lower costs. Laser trimmers are economical to use even in limited run-projects. This is particularly true since the laser cutter does not need to use custom-build tools or modifications for your projects.
Easier to use. It would be best to have a laser cutter, material cut, and a schematic to load into your computer. This cuts down the overall cost even when working on small batch projects.
Can handle any complex job. There is no job complexity when it comes to the laser cutter. The high-powered laser beam can work even on the very narrow section of the material being cut, thus resulting in little or no warping and distortion.
Less wastage and high utilization of the material. Laser trimmers can utilize a significant percentage of your material, thus maximizing the overall usable components.
Besides, trimming is a useful approach for the semiconductor industry when establishing various devices in a mono wafer device design, also known as device derivatives or options in general terms.
It is incorporated with a metal fuse, a poly resistor Zener called analogue trim cuts.
Improving semiconductors through trimming. Laser alignment involves target modification of electronic circuit properties through link blasting or laser cuts.
For this reason, the alternative component is selected and processed using a laser. Lateral trimming into a resistor increases its resistance value.
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When it comes to capacitors, removing the upper cover electrode can significantly reduce capacitance.
Some passive trimmer utilizes a specialized pressure chamber to facilitate resistor trimming in a single phrase.
In this case, the LTCC boards are contacted using test probes on an assembly side and cutting done by a laser beam arising from the resistor side.
This cutting method does not require contact points between the two resistances due to the pitch adapter contact with the component on the other side of where the cutting occurs. This means it is possible to arrange LTCC less expensively and more compactly.
Trim potentiometers, also known as trim pots, tune, adjust and calibrate circuits. It is a type of adjustable potentiometer or variable resistor. These trim pots are used to calibrate circuits and equipment immediately after manufacturing.
Trim pots are not meant to be adjusted or seen by the device’s user. They are usually mounted directly on the circuit board and adjusted using a small knob or screwdriver. Some have expandable shafts that can be adjusted using fingers.
Designers use adjustable potentiometers during the end testing of a unit to determine the ideal performance units of a circuit. However, some end-users opt not to have potentiometers since they can easily drift, easily mis-adjust or sometimes develop noise.
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Laser cutting machines have revolutionized the manufacturing industry. They can perfectly re-create designs made on a computer in a matter of minutes or even seconds.
You may be surprised at how many applications a laser cutting machine can offer. At All Metals Fabricating we use our precision lasers for high speed cutting with extreme accuracy as part of our sheet metal services.
But how do they achieve these amazing results? Let's take a look at what a laser cutting machine is, the different types of lasers that exist, and what they can achieve.
A laser cutting machine is a type of computer numerical control (CNC) machine. CNC machines are critical to modern manufacturing—for instance, at All Metals, we also offer CNC lathe services. A CNC machine takes commands from drawings that have been digitized and transformed into a computer language that describes every angle and curve of that design.
Once a drawing has been finished in a computer rendering program, all the designer has to do is send the design to the machine. It's much like sending an image file to a typical printer.
Best of all, the laser cutting machine can re-create these designs in minutes and can produce as many parts as you need, enabling efficient precision sheet metal fab. We employ laser cutting at All Metals as part of our state-of-the-art equipment fleet.
There are several different types of lasers used in CNC machines, which will be covered in the next section. But all laser cutting machines work in a similar way.
It all starts with a laser source, which produces a powerful, consistent light that can be adjusted quickly and with great accuracy.
The light is then focused and redirected until it reaches a fine point. If you have ever started a fire using sunlight and a magnifying glass, you will be familiar with the principle at work here. When the light is concentrated enough, it becomes intensely hot, allowing it to cut through the manufacturing material of your choice.
The laser is usually mounted on a gantry system. This allows the laser to move anywhere on an XY axis. This means that it can reproduce designs with great accuracy, even if there are large numbers of curves and angles involved.
That said, not all lasers can produce the same level of detail; some lasers aren't strong enough to cut through metal.
There are several types of laser cutting machines, but the most popular options are CO2 and fiber. (Note that while we offer tube laser cutting services, this is a different capability.) Each has its own strengths and weaknesses.
CO2 lasers are the most common type of laser cutting machine because they are the most affordable, but they are widely being replaced with the newer and faster technology of fiber laser cutting systems.
At the heart of a CO2 laser is a long, vacuum-sealed tube that is full of gas, mostly carbon dioxide (CO2), with some nitrogen mixed in. When this tube is electrified, it excites the gas molecules and creates strong light.
This light exits one end of the tube and bounces off a series of mirrors. The mirrors redirect the light through a focusing lens. The focusing lens concentrates the light to the point where it is very hot. The laser can then cut through a range of materials through thermal separation.
CO2 lasers are primarily used for sheet metal fab, and their main benefit over fiber lasers is that they generally offer a better edge quality on the cuts, especially on metal thicker than a 0.25".
Fiber lasers work in a similar way to fiber optic lights. Light enters a glass tube that is coated with a different type of glass, one that has different reflective properties. This causes the light to "bounce" down the tube, amplifying the strength of the light as it goes along.
The special properties of this light allow it to be much more easily absorbed by reflective materials, like metal.
The nature of fiber optics also allows the laser to be reduced to a much finer diameter. This means that a high level of detail can be achieved with these laser cutting machines.
This makes small low wattage fiber lasers ideal for engraving projects. They can transfer a computer image onto metal in a matter of seconds!
More powerful fiber lasers are used for actually cutting the metal, and now there are fiber lasers that can cut through up to 2" of material. For example, the 8KW fiber laser in our Texas sheet metal shop can cut through 1.5" stainless and aluminum and 1" steel. These machines are very large and expensive, but require minimal maintenance and have few moving parts that might need to be replaced or adjusted, ensuring greater reliability for our metal fabrication customers.
At All Metals Fabricating, we have multiple laser cutting machines, and our engineers are ready to help you optimize your design for cutting and fabrication. If this article has sparked your interest, please don't hesitate to contact us. We would be happy to quote any parts that you need laser cut.