What is Sheet metal: Definition and 25 Discussions

Sheet metal is metal formed by an industrial process into thin, flat pieces. Sheet metal is one of the fundamental forms used in metalworking, and it can be cut and bent into a variety of shapes. Countless everyday objects are fabricated from sheet metal. Thicknesses can vary significantly; extremely thin sheets are considered foil or leaf, and pieces thicker than 6 mm (0.25 in) are considered plate steel or "structural steel".
Sheet metal is available in flat pieces or coiled strips. The coils are formed by running a continuous sheet of metal through a roll slitter.
In most of the world, sheet metal thickness is consistently specified in millimeters. In the U.S., the thickness of sheet metal is commonly specified by a traditional, non-linear measure known as its gauge. The larger the gauge number, the thinner the metal. Commonly used steel sheet metal ranges from 30 gauge to about 7 gauge. Gauge differs between ferrous (iron-based) metals and nonferrous metals such as aluminum or copper. Copper thickness, for example, is measured in ounces, representing the weight of copper contained in an area of one square foot. Parts manufactured from sheet metal must maintain a uniform thickness for ideal results.There are many different metals that can be made into sheet metal, such as aluminium, brass, copper, steel, tin, nickel and titanium. For decorative uses, some important sheet metals include silver, gold, and platinum (platinum sheet metal is also utilized as a catalyst).
Sheet metal is used in automobile and truck (lorry) bodies, airplane fuselages and wings, medical tables, roofs for buildings (architecture), and many other applications. Sheet metal of iron and other materials with high magnetic permeability, also known as laminated steel cores, has applications in transformers and electric machines. Historically, an important use of sheet metal was in plate armor worn by cavalry, and sheet metal continues to have many decorative uses, including in horse tack. Sheet metal workers are also known as "tin bashers" (or "tin knockers"), a name derived from the hammering of panel seams when installing tin roofs.

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  1. Mike_5158

    Calculate force required to eject a sheet metal part from a die cavity

    How do I calculate the force required to eject a sheet metal part from a die cavity. Coefficient of friction: 0.35 Surface area: 521.26 mm2 Elastic modulus: 68.9 GPa Material: 3003 Aluminium Material Thickness: 0.7mm Any help would be much appreciated. Thanks
  2. S

    HVAC Assembling sheet metal ducts in situ

    In a house there is (typical of many 1950's vintage houses in my area) a framed cavity above the ceiling of a hallway and below the roof joists. It held a sheet metal heating duct "trunk line". The old ducts were removed since they had rusted through after being used (in the summer) with an...
  3. abrogard

    B How/Why Is So Much Force Generated In A Bender?

    I am talking about a sheet metal bender. Sometimes called a 'brake'. Bending metal of 1mm thickness or less. For those who don't know that's merely a long horizontal hinged metal bed upon which another sheet of metal is laid and clamped down just short of the hinge. Then closing the hinge...
  4. E

    What is the best material to use to cut galvanized sheet metal?

    hello every one can you help me in selecting the material to be used in the blade of cutting machine which will be used to cut galvanized sheet metal
  5. E

    Force required for cutting sheet metal

    hi every one can in you help me in finding the required force to cut sheet metal electrically as shown blew
  6. R

    Neutron absorbed by a sheet of indium, % chance

    Homework Statement A neutron is passing through a thin sheet of 115In of thickness 0.01 cm. Given that the density of the sheet is 7.31 g cm-3 and that the absorption cross section is 100 barns, what is the chance of the neutron being absorbed? You may assume the neutron is not scattered. a)...
  7. O

    How to optimize this part for production

    I would like to produce the 3mm thick sheet metal steel part shown bellow but I have a few questions. I have my doubts about the whether the bending of the top right part (with the holes) will work. The 5 mm spacing has to be there as the tool will be inserted into a 3 mm surface Feel free...
  8. K

    Automotive How to optimize an interference fit for a sheet metal ring

    Hi, I am new to this forum. I need to design an interference fit for a 1.5 mm thick SS ring. The interference fit is between this ring and another 1.5 mm thick SS sheet metal can without any groove. The ring is bent outwards at a specific angle.(please refer attached image) We know amount of...
  9. N

    MHB Maximizing Volume of Rectangular Prism with 120cm x 80cm Sheet Metal

    My question is that I have to find the dimensions of a rectangular prism (cuboid), where none of the faces are square that will maximise its volume. The sheet metal I have to build it from is 120 cm by 80 cm. I don't even know where to start, I can do it if I'm given a height, width or length...
  10. G

    Location of bend line on sheet metal flat layout?

    For a flat layout sheet metal part, is the bend line located directly in the middle of the bend allowance section, or is it inset from one side by a distance of the bend radius? So for a U-channel with an opening of approx. 4.56" (distance between inside of legs), would the distance between the...
  11. E

    Stress and Strain ratios in sheet metal?

    Hello! I'm having some trouble understanding stress and strain rations in sheet metal forming. I understand that they're constants, but how do you calculate them? Or are they usually given? Thank you!
  12. H

    Force required to bend sheet metal with a bending brake

    I want to know the force required to bend a piece of sheet metal in a hand bending brake. The sheet metal is clamped down and then bent upwards to a desired angle. The action is performed in the video below . Let's say I wanted to bend a piece of .032" thick AL 3' long to 110° (given the brake...
  13. S

    What is the req.thickness of sheet metal to prevent buckling

    My project involves making a 5 ft*3 ft*4 ft (l*b*h) aluminium/stainless steel sheet metal box at the back of a slow moving pedal vehicle. There is no load on the sheet metal, except from small vibrations from road travel. My question is: 1. What gauge of sheet metal thickness would be enough...
  14. E

    Difference in strength between extrusions and sheet metal

    Hello, How do I take into account the difference in stiffness when fabricating a part (for example, an L-bracket) from sheet metal or using an extrusion? In particular, where I work, it is "common knowledge" that extrusions are stiffer. How do i factor this in the stress and strain...
  15. K

    Calculate deflection in a shelf made from sheet metal

    How can I calculate the maximum load a shelf made from sheet metal can take at a certain deflection limit? Have a number of different sizes and gauges and need to calculate without testing. Any help is much appreciated. The shelf is supported in the 4 corners similar to photo below...
  16. J

    Trying to cut a parabolic shape in sheet metal

    Hi, I am trying to cut a parabolic curve in a piece of sheet metal using a numerically-controlled cutting machine (basically a very hard rotating router blade). The router blade is 10mm diameter. I want to achieve a parabolic cut in the sheet metal that adheres to the formula y=x^2 The...
  17. N

    Calculate Forces on Tools & Workpieces in Sheet Metal Spinning

    Hi I am a Mechanical Engineering final year student from India. I need to calculate the forces(axial,tangential and radial) on the tool and the workpiece in the sheet metal spinning operation. Is there someway to find it theoretically or using any software? thanks
  18. H

    Sheet Metal Automatic Split Detection

    I am running a project on trying to find a method of detecting splits that are present in pressed metal. The system is to be placed into a manufacturing press line of car panels that will automatically detect and notify when a split has occurred during production. Some methods I have come...
  19. M

    Designing a Racking System for Sheet Metal Coils

    Hi, ***I just noticed this that I posted this in the wrong section thinking I was in the engineering forum...sorry!*** I'm designing a racking system to store sheet metal coils (see attached sketch). I calculated the I and S values required and according to my calculations, 4 x 4 x 3/8...
  20. B

    Sheet Metal Bending Question

    I need a piece of .125" steel sheet metal to be 21" wide after a 1" lip is bent to 90 degrees on one side. How wide does the initial piece of steel need to be before bending in order to achieve this? I know it will be more than 22", but how much more? If I recall its fairly simple to figure...
  21. S

    Force Calculation in deflecting a sheet metal part

    Hi Could anyone help me in calculating the force required to deflect a sheet metal part (see attached excel file for details)
  22. D

    Sheet Metal Joining: Crimpable or Snap Fit?

    I'm looking to assemble two sheet metal parts (in the manner a bit like joining two halves of a box) in a simple manner that is either crimpable or some sort of snap fit. I have not seen any snap fit sheet metal designs and I wonder if there is any sort of standard practice (the aluminum sheet...
  23. G

    Investigating Vibration Reduction in Sheet Metal Using Electromagnetic Damping

    hello. can u help me with this planing execise manufacturers of sheet metal use rollers to produce the sheets. The sheets then pass along processing lines for painting. Transverse vibrations of these sheets results in a non uniform thickness of paint layers on the sheets. Electronmagnetic...
  24. Y

    Why Don't Car Makers Dimple Sheet Metal to Reduce Drag?

    This is my first post on this site and I figured I would maybe get a good answer to this question. If the dimples on a golf ball are to reduce the amount of friction due to air resistance, why don't car manufacturers dimple the sheet metal on their cars to reduce coefficient drag?? Just wondering.
  25. H

    Center of mass for sheet metal

    I am having the hardest time figuring out the center of mass of this problem. A sheet of metal is cut in the shape of a parabola (imagine that you have a parabola shape with the top being flat). The curved edge of the sheet is specified by the equation y=ax^2, and y ranges from 0 to b. Find...