Tiffany Haney
Sheet metal is a versatile material with a wide range of applications. One such application is in the creation of condensate drain pans, which are used to prevent water from dripping into unwanted areas, such as under water heaters or air conditioning systems. Fabricating a sheet metal condensate drain pan requires basic knowledge of cutting and bending sheet metal, as well as soldering or welding to ensure watertight corners. The process involves measuring and cutting the sheet metal to the required size, notching out squares from the corners, and then bending the sides up to form the pan. This can be achieved using various tools, including air shears, cut-off wheels, and nibblers. With the right tools and knowledge, creating a sheet metal under pan can be a rewarding project for both beginners and experienced makers.
| Characteristics | Values |
|---|---|
| Purpose | To prevent condensate water from dripping into areas where it is not desired |
| Uses | Home air conditioning systems, under vertical duct risers that run to the roof, under water heaters in attics or crawlspaces |
| Skills required | Basic knowledge of cutting and bending sheet metal, soldering or welding to make corners water-tight |
| Tools | Air shears, plasma cutter, air/electric cut-off tools, torch, nibblers, hand shears, air chisel, cut-off wheel, tin snips, sawzall, air-powered body saws |
| Procedure | Measure and cut sheet metal, notch corners, bend sides up, solder or weld corners, bend material to 135° |
| Considerations | Ensure sheet metal is raw and not coated with oils, chemicals or galvanizing |
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What You'll Learn
Sheet metal uses
Sheet metal is a highly versatile material with a wide range of applications across various industries. It is commonly used in both structural and aesthetic contexts, thanks to its durability, affordability, and malleability. Here are some of the common uses of sheet metal:
Automotive and Transportation Industry
Sheet metal is extensively used in the automotive industry for cars, trains, buses, and rail cars. It is employed for both structural and cosmetic purposes, including car bodies, frames, oil pans, hoods, roofing, seating, and springs. The material is also used in other modes of transportation, such as airplanes, boats, and trains, due to its lightweight and corrosion-resistant properties.
Construction and Engineering
The construction industry is another major user of sheet metal. It is used for projects such as balconies, industrial walkways, staircases, support beams, and framing. Sheet metal is valued for its strength and ability to hold structural components together. Additionally, it is used in plumbing systems, offering longer durability than traditional lead or iron pipes.
Art, Decor, and Recreation
Sheet metal is a popular medium for artists and designers. Its aesthetic appeal and malleability make it ideal for sculptures, decorations, and home decor items like metal bookcases. Sheet metal is also used in playground equipment, such as swings, slides, and seesaws, combining functionality with a playful aesthetic.
Custom Metalwork and Fabrication
Sheet metal is a go-to material for custom metalwork and fabrication projects. Its versatility allows it to be cut, bent, and shaped into various forms, making it suitable for a wide range of applications, from cookware to machinery parts.
Sheet metal's broad range of uses underscores its importance in our daily lives, even if its presence is often overlooked. Its unique properties make it a key material for numerous industries, contributing to the functionality, durability, and aesthetics of countless products and structures.
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Cutting sheet metal
Sheet metal comes in various thicknesses, known as gauges, and is made from different materials. The higher the gauge number, the thinner the sheet metal. The thicker the sheet metal, the more expensive it tends to be. Metals such as copper, aluminium, brass, and cold-rolled steel are generally soft, and tin snips are usually suitable for cutting these softer metals. Most strong and thick sheet metals will require power tools for cutting, such as an angle grinder, band saw, rotary tool, circular saw, or chop saw.
When cutting sheet metal, it is important to take safety precautions such as wearing work gloves and eye protection to avoid injuries from sharp metal edges and flying metal shards. It is also crucial to use the correct methods to achieve precise and safe cuts. Mark the sheet metal where you plan to make the cut with a carbide-tipped scribe, pencil, or marker. Use a stable bench or table to secure the sheet metal in place. Drill a hole in the metal using a carbide drill bit. The hole should be large enough for the bottom blade of the tin snips to fit into. Choose the appropriate tin snips based on the direction of your cut—green handles for right, red handles for left, and yellow handles for straight lines.
If you are cutting thicker sheet metal, you may need to use power tools such as a band saw or an angle grinder. When using a saw, ensure that the blade is fully engaged before it touches the metal. Cut slowly and gently, allowing the saw to work without forcing it. For sheet metal thicker than 22-gauge, it is recommended to use a lubricant like stick wax to assist in the cutting process and prolong blade life. As you approach the end of the cut, stabilise the straight edge to prevent bending due to weight. Once finished, release the clamps and file the edge smooth.
For more intricate cuts or thicker sheet metal, you may need specialised tools such as a plasma cutter or spot weld cutters. These tools are particularly useful when cutting out holes or patches in the sheet metal. Additionally, when working with sheet metal, it is important to ensure that it is raw and free from any coatings or impregnations that could leach into food when heated. This is a common issue when using small panels or projects, so always verify the suitability of the material for your specific application.
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Bending sheet metal
Step 1: Gather Materials and Measure Thickness
Firstly, ensure you have the necessary tools and equipment. Measure the thickness of your sheet metal using a ruler or tape measure. This measurement is crucial for calculating the bend allowance, which accounts for the expansion of the metal when bent.
Step 2: Calculate Bend Allowance and Mark Bend Lines
Use the provided formula to calculate the bend allowance. Then, using a protractor, mark the bend lines on your sheet metal. The first line corresponds to your desired bend angle, while the second line accounts for the bend allowance or bend radius.
Step 3: Cut Sheet to Size and Smooth Edges
Cut your sheet metal to the desired size, leaving a small trim of approximately 1/4" to allow for any inaccuracies. File and smooth the edges to remove any nicks or rough spots that could lead to cracks.
Step 4: Prepare Vise and Clamp Sheet Metal
Set up your vise with the appropriate form blocks, ensuring the guide angle matches your desired bend angle. Place and firmly clamp your sheet metal between the form blocks, keeping the bend line aligned with the guide angle. Support any excess sheet metal to prevent it from bouncing during the bending process.
Step 5: Bend the Metal
Using a rubber, plastic, or rawhide mallet, gently tap the metal towards the form block until it reaches your desired bend angle. Take your time to achieve a gradual and even bend, preventing any damage or dents to the sheet metal.
Additional Considerations:
It is important to note that different types of brakes exist, such as cornice brakes and box-and-pan brakes, each allowing for different types of bends. Additionally, when designing parts with bends, consider bend radii, bend allowances, and the potential for feature distortion within die lines or bend areas.
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Welding corners
First, it is important to select the appropriate corner joint type for your project. Common types of joints used in sheet metal welding include butt joints, edge joints, flush corner joints, and lap joints. A butt joint is the simplest, where two pieces of metal meet edge-to-edge. An edge joint involves two or more pieces of metal that are parallel and in the same plane, often with flanged edges. A flush corner joint is used for lighter sheet metal, as it is challenging to achieve good penetration. Lap joints are useful for repairing rusty panels, as they involve overlapping and underlapping the metal before welding.
For aluminium parts, open corner welds are recommended due to the material's sensitivity to heat. Filler rods can be used to reinforce and strengthen the corners without compromising the integrity of the aluminium. On the other hand, steel or stainless steel parts can withstand full outside welds with minimal filler rod, resulting in robust corners.
When welding thin sheet metal, it is crucial to adjust the amperage accordingly and keep it on the lower side to avoid blowing through the material. Tack welding at intervals can help hold the metal in place and manage heat distribution. Additionally, holding the torch at a 45-degree angle provides better visibility during the welding process.
Different motion techniques can be employed when welding corners. Some welders suggest moving in a straight line, while others recommend going from one side of the corner to the other using a side-to-side motion. It is advised to experiment with different settings and techniques to find what works best for your specific application.
Lastly, proper corner preparation is essential to ensure the durability and strength of the welded corners. Failing to prepare corners properly can result in weak and wavy corners that are prone to breakage. Therefore, taking the time to choose the right joint type and welding technique for your material and project requirements is critical to achieving high-quality results.
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Tools for cutting
When it comes to cutting sheet metal, there are a variety of tools that can be used to get the job done quickly and accurately. Here are some commonly used tools for cutting sheet metal:
Power Shears
Power shears are powerful tools that can cut through sheet metal with ease. They are typically electric or pneumatic and are designed to make quick, straight cuts. Power shears come in various sizes and configurations, making them versatile for different projects.
Nibblers
Sheet metal nibblers are tools that use a punching motion to cut through sheet metal. They are often air-powered or electric and can cut through metal quickly and efficiently. Nibblers are ideal for creating curved or intricate cuts that would be difficult with other tools.
Power Tools
Drill attachments, such as the sheet metal cutter drill attachment, can be used with a power drill to cut through sheet metal. These attachments are designed to be durable and portable, making them convenient for various projects.
Hand Tools
For smaller projects or more delicate cuts, hand tools such as nippers, snips, and scissors can be used. These tools require more manual effort but offer precision and control over the cutting process. They are often used for detailed work or when a power tool may be too cumbersome.
Bandsaw and Grinder
A bandsaw is a power saw with a continuous blade that can cut through sheet metal efficiently. When combined with a grinder, which uses an abrasive wheel to cut and shape metal, these tools can be used to create precise and intricate cuts.
When selecting the appropriate cutting tools for sheet metal, it is important to consider the scale and complexity of your project, as well as the level of precision required. Different tools excel in different situations, so having a variety of options available can ensure a successful sheet metal cutting process.
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Frequently asked questions
Sheet metal under pans are used to prevent condensate water from dripping into areas where it is not desired. They are used in home air conditioning systems, under vertical duct risers that run to the roof, and even under water heaters mounted in attics or crawl spaces.
There are several tools that can be used to cut sheet metal, including air shears, plasma cutters, air/electric cut-off tools, nibblers, hand shears, air chisels, cut-off wheels, tin snips, and saws.
A sheet metal brake is a machine used to bend sheet metal. It typically has between 11 and 16 hardened 'fingers' that allow for bending sheets of metal and forming sheets with existing bends.
To make a sheet metal under pan, you will need to measure and cut a piece of sheet metal that is 2 inches larger than the size of the pan you need. Ensure all corners are square, then notch 1-inch squares out of each corner. This will allow you to bend each side up to create a pan with 1-inch tall sides.
When working with sheet metal, it is important to ensure that it is raw and does not have any coatings or impregnated oils, chemicals, or galvanizing that could leach into food when heated. Additionally, consider the thickness of the material and the type of bends required when choosing a tool for bending the metal.
