Questions tagged [design]

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24
votes
3answers
7k views

Why does this fence have a kink?

The image below shows a style of fence that I've seen frequently around train tracks. If you look closely, you will see that between the third and fifth horizontal wire from the top, the vertical ...
0
votes
1answer
34 views

Motor For powered adult swing

I'm trying to design a powered swing for adults (similar to a baby swing, but scaled up). Am I right in assuming that this is functionally a pendulum and the power required is (0.5)mgsin(t)? How ...
0
votes
0answers
16 views

Need new pressure switch mechanism for a 3 phase compressor using a 220V AC Drive

I've bought a vintage Quincy 216 air compressor. Actually there are duel Quincy 216's - each has a separate 3 phase motor. One motor is 1.5 HP and the other motor is 2 HP. The compressors share a ...
0
votes
2answers
55 views

Can stainless steel be used in continuous high temperature environment (500°C to 850°C)

Can i use stainless steel as a furnace roof. Furnace temperature will be max upto 850°C. If so which ss grade will be the best in this situation. Thanks
1
vote
0answers
15 views

What are the limitations of Gravity Sketch? [closed]

Gravity Sketch is a program (app) for the Oculus VR platform. What are its limitations compared to, say, Fusion 360 (a slightly more traditional design platform?) It looked like it doesn't provide ...
0
votes
1answer
58 views

Please accept my request for an obsolete engineering theory [closed]

I am writing a thesis concerning government organization, and I would like to make the analogy that illustrates that law scholars are failing to seek practical solutions, because they are confined to ...
0
votes
1answer
28 views

Solidworks - how to make a groove on a double curvature surface

Today, as I was making -for another post - the following part Although, I managed to use a couple of ways to do the above (revolve a sketch, and b) using swept cut) I wondered how would I make ...
9
votes
6answers
2k views

How to work on big CAD project in team?

I'm always confused on what is the effective way to work on CAD with multiple team members to make it efficient. So far, as I'm freshly graduated I only work on a project where I'm the only one using ...
0
votes
1answer
53 views

Problem with railway crossing, need help! [closed]

I am looking for a solution to my real-life problem that not only affects me but also many other people. I am simplifying the problem to make it easier to understand. My daily commute to work includes ...
-1
votes
2answers
83 views

Why design chargers with USB port on a side rather than top [closed]

Edit 3: the question being closed due to being opinion based? The design causes problems that are not in the other design, there are no benefits provided for the restrictions that the design imposes, ...
1
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0answers
18 views

Sign convention for angular velocities in 3D gear train

Consider a Humpage gear train shown above. We are viewing the gear train from right and gear B is rotating in clockwise direction. If we consider clockwise direction as positive what will be the sign ...
0
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0answers
15 views

Creo Parametric 4.0 balloons BOMs for multi page drawing

How to put repeat balloons on the partial views of assembly? Example Full View BOM Question How to put a balloon (Item 1) to the Auxiliary view? Note: number should be parametric Follow up Are here ...
0
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0answers
21 views

In a high pressure water pump what component or design parameter increases pressure output, let's say from 200 atm o 2000 atm?

type of flow? length or diameter of the plunger piston?, or weight of the piston and crankshaft and torque or HP to move it?, or RPM. direct drive pumps used in waterjet cutting use a slim plunger ...
0
votes
2answers
46 views

Discrete-time realization for continuous time domain controller/filter?

Let us say I simply design a low pass filter like (1/s+1) with the cutoff frequency as 1 rad/sec, when I implement it in real software, do I have to do the discrete-time realization? If not, what ...
0
votes
2answers
54 views

How to design stiff plastic sheet

I am making a cylinder of polypropylene that must be pressurized (2 bar). The rough dimensions of the current design (A) are 7 cm tall, 5 cm in diameter, and wall thickness of 1-2 mm. The issue is ...
2
votes
0answers
39 views

How to estimate effective area of contact between rough surfaces as function of surface roughness

The engineering problem that I am trying to solve is the following: I have two elements of a magnetic circuit that I must keep in contact through threaded fasteners. The primary objective is to ...
0
votes
0answers
42 views

Lab Jack with Bi-Dimensional Movement

I just bought a lab jack like this one: Its purpose is to change its height without loosing its rigidity by using the so called: scissors mechanism I was wondering if there is a similar device like ...
1
vote
4answers
78 views

Balancing suction air flow at different areas on pipe

I have a T-shaped pipe that is connected to a vacuum pump. Along one side, there are 4 areas of 9 holes where air will get sucked in from the surroundings. It's used to pick up some small objects. The ...
10
votes
4answers
6k views

Why don't motorcycles have as good a turning radius as bicycles?

The question is about why are motorcycles not manufactured with handlebars that can turn to great degrees like a bicycle. In most motorcycles, you hardly have a steering angle of about 20-30 degrees, ...
1
vote
1answer
55 views

Optimal curvature for a gooseneck stand

Can you suggest the basic principles for optimal neck adjustment of a gooseneck stand such as the one in the image? I'm looking for the curvature that will offer greatest mobility and stability, while ...
1
vote
0answers
46 views

How to approach potential hazards that may result from user misuse, in a product design phase? [closed]

I am researching guidelines and considerations with respect to user safety when designing commercially sold products that contain user-operated machinery and moving parts (I.e. motors, pulleys, ...
1
vote
0answers
27 views

How to design an outrunner BLDC motor

I've difficulties to find a good documentation or a book to how to design an outrunner BLDC motor. My propose is, defined RPM and approximative kW and some other parameters, which are calculation ...
0
votes
0answers
9 views

Question regarding 2D simulation of orthogonal cutting operation on Abaqus

I'm trying to simulate an orthogonal cutting operation on Abaqus, I'm using Dynamic explicit analysis. I have defined my tool as Rigid analytical body and the workpiece is of Ti6Al4V, I have not ...
1
vote
0answers
54 views

Guidance for a CAD model of a product

Hi Everyone! I am a novice in CAD modeling, and I am familiar with only two CAD tools - Autodesk fusion 360 and Solidworks. I want to make a CAD model of a product with the outer pod or shell as seen ...
1
vote
0answers
27 views

Design specifications Venera 13/14 [closed]

I am trying to 3D model the Venera 13 or Venera 14 spacecraft. These are Russian spacecraft from the 1980s. I am looking for design specifications, plans, schematics, or anything else that might make ...
1
vote
2answers
43 views

Where to place air, water and electric cables in a composite beam [closed]

If water, gas and electrical cables have to pass through three (3) openings provided in the cross section shown in Figure 2, with tangible and scientific arguments specify the adequate opening for ...
1
vote
0answers
19 views

Spectrometer design

I am looking to design a compact spectrometer based on using one single concave grating as both the dispersive optic and the imaging optic. I am investigating these gratings: https://www.edmundoptics....
2
votes
1answer
66 views

How to design an enclosure around the load cell (Beam type)?

Hardware and Electronics Used: Arduino UNO, HX711 ADC Load cell amplifier, Load Cell (2Kg); Currently, I am working on a project which requires me to put load cell along with the other circuitry in an ...
2
votes
1answer
122 views

On steam locomotives with six driving wheels, why are the rear set of wheels placed further apart from the other two?

So, as the question states, on steam locomotives with six driving wheels, the rear wheels are farther from the middle wheels than the front wheels are. You can see it in these pictures: It's ...
1
vote
0answers
91 views

Will high velocity air directed underneath a half-toroid shaped Coanda saucer by a centrifugal impeller create a lifting force?

I would like to know if a lifting force will be created by the Coanda effect from high velocity air that is directed underneath a half-toroid shaped saucer by a centrifugal impeller. I am seeking an ...
1
vote
1answer
49 views

Component selection type for fluid-mechanical system

I am creating an enclosure and need to get a water supply through a plastic wall inside to the core device. I imagine this water line will be a flexible tube and will screw on or snap to an adapter on ...
1
vote
1answer
121 views

On modifying imported STL files in Solidworks

Some weeks ago I downloaded a couple of 3d models from Thingieverse in STL format and I wanted to make some minor modifications before printing. The modification were: I wanted to split a multi part ...
30
votes
3answers
8k views

Why are railroad tank cars bent in the middle?

I recently noticed that the cylindrical shape of a railroad tank car is not completely straight but has a bend in the middle. The entire tank is a bit lower there. What's the reason for this bend? ...
2
votes
0answers
39 views

How would you build a road system that respected nature? [closed]

How would build a road system or transportation system that respected nature with the following constraints: No paved roads or less than 10% paved roads can’t use gasoline (oil) allow nature to ...
1
vote
3answers
73 views

Mechanical joint that break at specific force

I am designing a joint which I want to break at a specific force. I want to design a 2 parts connected by a joint that breaks when a certain amount of force is applied and thus prevent any damage to ...
1
vote
1answer
56 views

What is the best way to build this parametrically in solidworks?

I want to make a structure like the following where: L is the total length and its fixed $\lambda$ is the distance between each arc n: is the number of repeated structures in the center I have ...
1
vote
4answers
67 views

Is it somehow possible to "lock" moving boxes without damaging them? [closed]

I have a standard moving box like this: Of course, since I'm asking about it, they don't have a top-down photo. These are other photos, if they help you understand how it's constructed better: ...
0
votes
2answers
45 views

Gear configuration for a legged hexapod

I have an assignment for my Mobile Robotics course to design the drive mechanism for a legged hexapod and demonstrate its gait in motion. The idea is to design the hexapod as per the following ...
1
vote
2answers
103 views

Criteria for gear design

Updated with comments/answers from community to make more complete I'm trying to understand why gears are designed in some specific way instead of another. So far my understanding is that: energy is ...
7
votes
2answers
464 views

Wheelbarrow minimize wear

I have a question about the design principle. To explain my problem I made the sketch "wheelbarrow". To minimize wear, which design is preferred?
0
votes
0answers
34 views

Calculating estimated Overall Heat Transfer Coefficient

I have problem where I'm trying to determine the Overall Heat Transfer coefficient of a heat exchanger that uses the latent heat of vaporization of water in the process. I know the Q value I'm trying ...
0
votes
0answers
16 views

Determining length of interstage cooling coils for removal of heat

I'm currently trying to determine the length of cooling tube required to remove a specific amount of heat from my exothermic reactor in stages. I'm aware I need to use the equation $Q = UA \theta_{...
1
vote
1answer
49 views

Applying ISO fits to radial bearings

Do you need to take the bearing size tolerance into account when creating the tolerances for the mating hole/shaft when using ISO 286 tolerances? For example, a 125 mm OD bearing with a desired H7 ...
0
votes
2answers
123 views

Good estimates for torque generated while turning a dial

I'm trying to design a little device which is hand-driven and which involves turning a bevel gear pair. I want a small gear pair but I don't want it to be weak. The forces involved will be small (it's ...
1
vote
5answers
135 views

How to choose tolerance size?

I can not really understand how people decide what tolerances to set for a part or assembly. For example: When can I choose 0.2 mm and when 0.002 mm; and if I choose 0.002, why didn't I choose 0.001 ...
3
votes
1answer
55 views

Improving ball feeder design

I designed this ball feeder for my robot however I'm experiencing frequent ball jams as the ball is stuck against the wall of the hole entry or just a ball being moved left and right not entering the. ...
4
votes
4answers
867 views

Why are many compliant mechanisms only flexible in the joints?

I've been playing around with 3D printing some compliant mechanisms, mostly to get precise linear motion, and I've noticed that many commercial compliant mechanisms are often designed like this: ...
0
votes
1answer
63 views

What are the names of these connection mechanisms?

I've tried to search for the name of the connecting mechanisms on these clips but I can't find it. I'm trying to build something where two parts are connected on one axis (diameter less than 5 mm) but ...
2
votes
0answers
73 views

Does it matter what direction a herringbone gear turns?

Obviously, the forces and pressures should mostly be the same, but just in reverse. But when play, flex, and such are accounted for, are there any subtle differences to having a herringbone gear turn ...
0
votes
2answers
78 views

Best support for a granite table top?: Flat bar 316L Stainless Steel or equal box section or unequal box section

Project is outdoor granite topped table. Table legs are two isosceles trapezoids crossed together at 90 degrees, with the legs having an internal angle of 80 degrees, made from 100 x 100 x 4mm 316L ...

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