Computer-Aided Design is the use of computers in the engineering design process. It involves drafting, modelling, simulation, optimisation, and creation of technical documentation. The term CAD is often used to denote software for computer-aided design.

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### Fillet Indicator or Potential Tolerancing

Currently working on some drawing from the Spitfire Mk. V. I am working on this piece from part of the undercarriage legs. I am working with Inventor LT 2021. In the source drawing I can see ...
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### Method to calculate required gear size and teeth size for a rack system for a certain amount of travel?

high school amateur engineer- and first-time poster- here. I'm making a Nerf automatic springer system, and I want to model it. However, I don't know what size rack and gear system I need. I need 60 ...
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### Creating a cutable body from a fit-point spline outline in Autodesk Fusion

I have an outline of a shape that I created with fit-point splines. This appears closed to me (as in, it creates a continuous shape), but when I try to extrude, I cannot select it. When I try to use ...
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### How to make Peaucellier–Lipkin linkage work?

I tried in math.stackexchange.com and they send me here. First: Don't crucify me for not "doing math", or asking a dumb question. School was a long time ago, and lose what you don't use. My ...
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### Identify pairs of points of constant distance between them, placed on two moving (rotating) rectangles

Let there be two squares (or rectangles, but say its squares for simplicity). These squares are attached to an axis (bellow, marked red) around which they can rotate. For simplicity, let's say they ...
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### How to Create a parabola in a CAD drawing?

How to Create a parabola in a CAD drawing? How to create a parabola in a CAD drawing for extrusion etc? Need a .STEP file ultimately. OpenScad would be optimal. I tried this in fusion 360: https://www....
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### How can I create this lead of helix cut in CAD?

In this blueprint: http://library.centerofthewest.org/digital/collection/WRAC/id/2703/rec/8894 How can I create this Head of helix cut? I'm having trouble in determining the position of the plane and ...
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I'm trying to design a space-saving, wall-mounted, fold-away workbench that has an auxiliary platform that folds out. The fold-away linkage to support the aux platform when it's folded out is taxing ...
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### Fusion 360: How to copy a sketch to an offset plane

Imagine a platform standing on supports on an inclined surface. The support on the right is higher than the one on the left. I have already created the sketch of the right-hand support and would like ...
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### How to place object in Inventor drawing using custom UCS

My Inventor model somehow ended up with its coordinate system very misaligned with its faces so that when I try to create a drawing, the orthographic projections I get aren't the best (the top right ...
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### How to CAD: smooth width transition in sheet-metal bends

I am working with FreeCAD 0.20 and Sheet Metal work bench 0.2.63, but universal CAD tips are also welcomed. As shown in the image, I would like to bend sheet metal with smoothly chancing width along ...
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### How to add a flange to sheet metal cone (funnel) in Autodesk Inventor?

In Autodesk Inventor Professional 2024, I am failing to add a flange to a sheet metal cone (300° for now, eventually the tabs will be used to mount and close the funnel), that is created in a sheet ...
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### How can I make an internal part of a Solidworks assembly become external?

I have found a part in an assembly which has been saved internally, while the rest are external. How can I turn this part into an external one? I need all the references to stay though. Also, should a ...
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### How can I determine the best thicknesses of a circular plate to achieve minimum weight and high strength?

I want to design a circular plate made from iron ductile material, So I want to determine the best thicknesses of the profile (t1,t2,t3,...etc) as shown in the image tyo achieve the best plate weight ...
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### Activate a mechanical end-stop with a lever

I would like to be able to record the motion of the shafts on a loom. I have some mechanical end-stops, and would like to trigger them with levers that raise and lower when the treadles at the base of ...
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### How do I unminify a DXF file that appears to be minified?

I have tried so many different programs to convert this file to correct, but what I have is a DXF of an eagle. It appears to be minified in some fashion or created in some non-standard CAD program. ...
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I'm trying to to teach myself to design gears for a hobby project, and I want to make a similar design. I typically use Autodesk inventor, but I was wondering if there was something better for this ...
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### Solar panel locaiton with plex-earth and virtocad

I need to use Plex-Earth and VirtoCad to solve a solar panel positioning problem. I am on BricsCad. I have a kml for a boundary area. How can I, using these softwares, get the following groudn mount ...
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### What are the positions/diameter of the anti-rotation bumps on this mechanical drawing?

I am designing a front panel for an electronic device with PCB-mounted components on it. I need to provide precise CAD geometry for drill holes, etc. to the third party that will mill / manufacture ...
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### Create a mechanism to support a speaker in the upper part of an enclosure

I am working on an electronics enclosure. There will be two parts, the main enclosure and the lid that gets screwed. In the upper lid, I want to have a support for a circular mini speaker. The speaker ...
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### How do I complete this tolerancing problem? Can someone walk me through Part 1?

I have been trying to solve this using rules of Basic hole and Basic shaft calculations but I keep getting it wrong
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### How to draw a quarter turn cam

I am trying to make a 3D printed cam for a quarter turn switch in OpenSCAD. The mechanical stops are trivial, low dwell and high dwell no problems (concentric circles), but I cannot figure out how to ...
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### Not able to make enclosure in DesignModeller

I have a Fusion 360 model that I imported into ANSYS Workbench Fluent as a .step file. I want to make an enclosure around it but it is giving me an error. The error doesn't occur if I choose just any ...
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### How to model this object?

I'm trying to make a 3d model of this showerhead holder I did this STL file using cadquery: ...
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### How to prevent water droplets from staying on stainless steel / glass surfaces?

I'm designing a small tea strainer in the shape of a cylinder that goes into a glass bottle, which is also shaped like a cylinder. Currently, I'm still designing it in Fusion 360, but I'm facing one ...
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### Designing a tea strainer: What should I do first?

I hate to ask a somewhat broad question, but here I am with no one else to turn to 😅. Specifically, my question is: What should I do first? Let me explain the context to make my question a little ...
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### Tolerances in the manufacture of mechanical parts (plastic)

It is necessary to make an adapter ring for connecting the smartphone to the microscope eyepiece (turn from ABS on a lathe, or 3D printing). Microscope eyepiece diameter is 33mm. What should be the ...
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### Jibs fastening in a frame structure

I need to make a demountable frame for cycling trials: I want to make it based on steel profile square tubes: The design must have variable dimensions and slopes. I guess provide variable dimensions ...
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### Mechanism for turning a thumbwheel potentiometer

I am trying to devise a method (3d printing or injection molding) in order to turn a potentiometer via a thumbwheel mechanism. Take a look at this picture, from an old commercial product that I am ...
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I have a thread in an actual product, that I want to replicate in a 3d print. I have no clue on what to measure, and how to replicate it. This is the thread: One possible solution is this: I have an <...
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### Seeking example problems solved using Automated Design Synthesis (ADS) algorithms

Premises. Gary N. Vanderplaats and coworkers at the Naval Postgraduate School in Monterey, California developed the Automated Design Synthesis (ADS) algorithms (software) that have been adapted to ...
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### Comparison between hand calculations of a continuous beam with FEA simulation (Solidworks)

I've seen many videos and books where statically determined beams' hand calculations are checked using FEA. But why is it that FEA results don't match the ones obtained using hand calculations (in ...
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### CNC Mill an Airfoil Shape in MasterCAM

I have this airfoil shape which I created using MasterCam. I used the milling function called MULTISURFACE. When I select the green highlighted spot above, it will throw me an error. Is there a way to ...
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### How is the edge piece made?

Apparently the "CUP HOLDER" has a long history. The 1944 Spitfire cupholder above has me a tad confused about the manufacturing process. I am looking at the encased wired that is running ...
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### What reference lines can be trusted and what points are being dimensioned

Based on the dimensions for the fold lines of the part above, the part is not square in the corners. It is my understanding that the short sides are actually at an angle other than 90 to the long ...
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### Make Assembly Load Options unique to each assembly in Siemens NX 12

I have a few assemblies I'm working on. For the most part, each assembly is self-contained in its own folder (assembly file and part files). However, there are a number of common parts that are stored ...
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### slits and slots

We are designing a part such that it is clamped. We are providing a slit for tube insertion. I need to know how much depth and width we can provide the slit sizing. Here I am attaching the slit image.
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### BA Hole Designation

I a previous question I included a drawing for a strut. In this strut drawing it designates a 2 BA Hole in the bottom of the strut. I have seen this call out for many other parts that are part of ...
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### How do I measure groove separation?

In this drawing it says that each groove is separated by 5deg. Each groove has a depth of .015", the radius of the contour is 0.47" How do I measure the separation of each groove? My sketch ...
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### Fusion 360 - Unexpected behavior when using deboss on curved surface

I'm including the example file. On one side, the text is debossed as expected. Using the same process for the other side, "Educate, Equip, Empower", the boss seems like it's coming at an ...
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### How to Create a Limacon of Pascal in a CAD drawing? [closed]

How to Create a Limacon of Pascal in a CAD drawing for extrusion etc? Need a .STEP file ultimately.
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### Automatic letter connection for plasma cut parts with nested holes

Something I'm consistently running into as an issue is connecting letters so they don't fall out or leave a missing unconnected hole in a letter that is cut out of metal. Is there a way to ...
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### In Ansys ICEM CFD, what do these "cube" symbols on the midpoint of block edges mean?

When I was meshing a helical coil, I've noticed these "cube" symbols located at the midpoint of a the block's edges: Blocks with these symbols tend to have a lot of strange/unpredictable ...
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### How to design a gear decoupling system?

I'd like to convert my stupid door lock into a smart one. I already have a gear for the lock knob. Now I'd like to design a gear decoupling system that will be connected between the knob and the motor ...
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### How to express one constraint as a function of another with sum in FreeCAD

I have one named constraint, R1, and now I want to define another constraint as R1-5. How can this be done? I been reading here and I manage to make it work with product and division but not sum or ...
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### Reference geometry for a 3D arc in SolidWorks

Spherical Parallel Manipulator in SolidWorks I am drawing in SolidWorks a 3D arc with two holes on the edges. An axis of rotation passes through the center of one of these holes, around which the arc ...
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### How to stop gear from wiggling despite connected gear being fixed in place?

I have designed and 3D printed a gear system with three gears. Two identical gears at each end with a smaller gear in the center. One of the larger end gears is to be rotated by a stepper motor, the ...
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