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Questions tagged [design]

Questions about or related to design.

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LID Design - Layout and Concepts

I have a general but important question regarding LID design. I work as the only civil engineer at my company, and I have rarely used LID design in my projects. I am trying to familiarize myself with ...
Steven Reed's user avatar
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Gizmo away from the object in FreeCAD

I downloaded a Mecanum wheel model from grabcad but its Gizmo is away from the Object. Is there any way to correct it? I tried Changing "Position" under "Placement" but its ...
Pratham's user avatar
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I want to know on how to maintain center of gravity of a robot (IGV)

I am making a IGV (Inteligent ground vehicle) in the form of a cylinder with the base as a circle. I want to know whether my bot can climb a 15° gradient ramp or not. Some specification of robot - ...
Aryan's user avatar
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1 answer
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How does this water canon function?

While idly watching shorts, I came across this one. And after watching it a hundred times, I still don't understand how the water canon functions. I mean, where is the pressure coming from? The design ...
EMS's user avatar
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Specification Tolerance Table vs Formula Discrepancy

BACKGROUND I was debating asking this in math exchange but opted for here since it is based on engineering specification. I was recently going through the specifications for Whitworth threads in BS 84:...
Forward Ed's user avatar
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3 answers
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Electronic enclosure - Long screw holes

am designing an electronic enclosure for a medical device. For assembly reasons, the enclosure is split into two halves, with the bottom half having a depth of 200mm and top half of depth 50mm. I want ...
Sengalraja's user avatar
1 vote
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30 views

Cryogenic pump - why is this part slotted?

What is the purpose of that slotted area? In my opinion it is done that way in order to prevent it (the impeller) from sticking to the pump body in case it is not properly cooled down. Some people say ...
Gabriel Zitterspiller's user avatar
1 vote
0 answers
24 views

If building a DIY screw jack, would it be beneficial to add a gimbal to the jack nut, and/or to the screw attachment?

The screw jack will be used twice daily. It will be made out of M24 8.8 grade threaded rod and nut. The nut will travel 300mm, to raise a weight of 50kg by 800m, via a pivoting lever arm. The parts ...
Russel Walker's user avatar
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1 answer
20 views

Can this new AC motor/generator design work?

I'm currently in the works of developing a vertically suspended flywheel, and I'm trying to figure out the best method to convert rotational energy to electrical energy and vice versa. I don't want to ...
ARJ's user avatar
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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 ...
Bizz Keryear's user avatar
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0 answers
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Custom Rack and Pinion for 1979 Firebird

I am attempting to convert my firebird to a rack and pinion steering system, so I can introduce later modifications. https://www.unisteer.com/products/1975-81-firebird-trans-am-power-rack-and-pinion-...
Noah 's user avatar
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Need help with VHDL

Game Design Let us create a little game with a seven-segment display (SSD). There are two inputs, “clk” and “stop”, and one output “dout(6:0)” that feeds the output to the seven segment display as ...
Melinda Georgia Brown's user avatar
1 vote
0 answers
31 views

Need help for Fire Detection System design

As a Building Services Engineering student, my current project involves the design of fire detection system of a newly-installed at-home EV charging system. The EV chargers are installed in the ...
Esther Liu's user avatar
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23 views

New Method for a Passive Magnetic Bearing

Is it possible to create a passive magnetic bearing by layering the outside of a shaft with a magnetic film and placing a magnetic ring on the outside. The outer layer of the film would have a north ...
ARJ's user avatar
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1 answer
95 views

how to interpret ISO2768-mK angular tolerance

How to apply tolerance for angle based on ISO-2768-mK? Cause I am confused about the statement "Permissible deviations in degrees and minutes for ranges in nominal lengths". Lets say I have ...
CKK33's user avatar
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1 answer
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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 ...
Imsa's user avatar
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How do I find the pitch for the fly press?

To solve the problem first I need to find the pitch of the screw to find the shearing stress, is the stroke 45 degrees per 5.75mm or 90 degrees per 5.75 mm?
Youssef Mohamed's user avatar
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2 answers
50 views

I am looking to make thread changes to a handpiece for laser hair removal equipment

I am looking to make a design update to the threading of the main body hand piece (piece in which you hold) to the different size standoffs (basically pieces that position the laser beam at different ...
Gabe's user avatar
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Single Photon/Electron Emitter

Is it possible to buy single photon/electron emitter in market for experimental purposes? If yes, can you please guide me where and how?
Ok-Virus2237's user avatar
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1 answer
66 views

Is there any elemental pieces template (blank) which together forms a corrugated box of desired size, or is there anything similar to it?

We run a corrugated box business. I have known elements in chemistry; I was thinking, whether similar to them, there are any elemental corrugated box templates (dieline; keyline) which together form a ...
Sensebe's user avatar
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Best pump for hot milk (Self priming)

I am currently in the process of building a machine that can make tea(in a saucepan). I have almost finalized everything, but am having trouble selecting what pump to use. I read the following ...
abdullah mohsin's user avatar
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0 answers
64 views

Best way to cool a tank of milk

I am not sure if I can ask this here - if not let me know which stack would be appropriate. I am currently in the process of making a robot that can make a cup of tea. However, I am having trouble ...
abdullah mohsin's user avatar
0 votes
0 answers
22 views

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 ...
Ahmed Obaid's user avatar
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0 answers
28 views

Designing a toilet for autoimmune protection: engineering question

In autoimmune disorders, when a bacteria enters the body, the immune system resounds, growing, fighting it off, but this immune system growth, due, to the autoimmune disorder, also attacks the person'...
Joselin Jocklingson's user avatar
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1 answer
40 views

What's the best way to mount many clock hands on a custom clock?

I'm building a custom clock that requires 4-5 clock hands that need to move individually. I've designed it so the hand are to be mounted on telescoping brass axles (that have press fit gears ...
James's user avatar
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-1 votes
2 answers
70 views

Will a lid hovering above bursting air bubbles catch smog particles

The bubble bursting phenomenon goes like the above describes: At 1, the air bubble is under water. At 2, the bubble emerges above the surface, with a thin film of water rising to keep it from bursting....
El Flea's user avatar
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1 answer
48 views

What is the name for a design element which includes trusses within a member?

I cannot think of what to call this design technique, where a truss-like structure is used within a member to provide strength and rigidity with minimized weight. I’ve included a picture which ...
Catradora's user avatar
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0 answers
42 views

How do you calculate the energy released by a gas spring when it is released from being fully compressed?

I'm a Freshman Mech E Student, and I'm designing a 3lb Combat Robot for a club. I wanted to be weird and use something I've never seen on a bot before. It's a fun design challenge, but physics ...
TechNicly's user avatar
1 vote
2 answers
72 views

Help me choose an approach to gpu cooler design

I want to remake my gpu's cooler cause the original fans have a terrible bearing sound on low rpm and no amount of software solution helped. Anyway, I want to use 3x nf-a9x14 pwm 92mm fans as its fits ...
Nah's user avatar
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1 vote
1 answer
46 views

Could someone help me with this physics problem about water pressure

I am designing a rainwater collection system. Rainwater is initially collected in an open-top barrel equipped with filters and sensors. This barrel is connected to a pillow tank, a flexible water ...
Daan's user avatar
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1 answer
60 views

What software was this designed in?

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 ...
Ammar Aldabbagh's user avatar
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0 answers
32 views

Circularity symbol with datum?

I am trying to interpret a technical drawing that has a datum attached to a circularity GD&T symbol. This page says that Circularity never has a datum reference. But this is a technical drawing ...
tar's user avatar
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0 answers
20 views

Shaped charges and fluid dynamics

Watching this video https://twitter.com/Rainmaker1973/status/1713599092968787987 of objects being dropped into water and the resultant shape of the displaced fluid reminded me of videos showing how ...
Peter's user avatar
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0 votes
1 answer
183 views

Figuring out thread (neck finish) for bottle cap

I've done a fairly large amount of googling on two different occasions trying to figure out what neck finish I have on a particular bottle thread I have here. I'm in europe and this is for a plastic ...
TrisT's user avatar
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0 votes
1 answer
117 views

Would a conical-shaped solenoid be propelled by its interaction with the Earth's magnetic field?

I am wondering if the interaction between the magnetic field created by a conical-shaped solenoid and the Earth's magnetic field will result in this conical-shaped solenoid being propelled through the ...
user57467's user avatar
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0 answers
16 views

Creating a customizable high pressure extensions line for cga 580

So I'm trying to set up a keg on nitro. The way my room is laid out, id like to have the n2 cylinder far away from the regulator and keg. One side of this setup requires cga580 male, the other side ...
Andrew's user avatar
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0 answers
48 views

How can I make sure that my outflow is the same as my inflow?

I have a basin that is 110 mm wide, 200 mm long, and 15 mm deep. The walls are 2 mm thick. It has water being pumped into it at a rate of 0.1078 gpm from one side. In order to ensure that this pan ...
Skuz's user avatar
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1 vote
2 answers
757 views

Braking system for a miniature ‘Drop tower’ rollercoaster

The tower itself is only max 400mm. Designing the lifting system isn’t the problem but slowing down the gondola is posing a slight problem, any suggestions? I have looked into using magnets but I can’...
Ruperttt's user avatar
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0 answers
30 views

How does this fluid-fill stop mechanism work?

I bought an interesting shaped water fill-stop valve from ebay a while ago. Very convenient form factor, even though there was some forward pressure requirement. I want to now make a custom version ...
WhisperingShiba's user avatar
0 votes
1 answer
114 views

What would be the best capacitor to use for a railgun that uses a capacitor as the projectile?

I have had a long-time interest and fascination with railgun technology and for a long time I have wanted to build a small-scale, simple railgun as a scientific experiment. This railgun is designed to ...
user57467's user avatar
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0 votes
0 answers
113 views

Dual Axle Tiny House Trailer Build; Question About Structural Integrity of Trailer Design

I have questions about the fabrication of a tiny house trailer I am building. The questions are focused primarily whether I am adding enough cross supports. My overarching design principle: That of a ...
Gary's user avatar
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0 votes
0 answers
22 views

Drone Geometrical Shape

Drone Can Drones be designed with geometrical shapes viz Kite, Cylinder, Sphere etc?
Prashant Akerkar's user avatar
-1 votes
1 answer
55 views

Which design is most resistant to tipping against 90 degree downward force?

Have a question sort of related to question at (What calculation to find how much force before tipping over?) but with slight modifications. Trying to weld some tubing together and onto a heavier base ...
Brian's user avatar
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0 votes
0 answers
47 views

High speed linear actuator/motor design

I need to make a linear actuator to compress a spring 80mm in 0.1 seconds. This is a speed of 1600mm/s. It takes around 15kg of force to compress the spring. How can I design a linear actuator for ...
Yassin's user avatar
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1 vote
3 answers
2k views

Do I need a pressure relief/safety valve if my pump can't exceed the rated system pressure?

I am designing a resin dosing & mixing room for a production plant. This will use pneumatic diaphragm pumps to pump the resin & additives, flow meters to measure the dose, and pneumatic ball ...
Kendric Rendle-Short's user avatar
2 votes
3 answers
87 views

How are springs that are designed for 100% extension different for ones that are designed for 60% extension?

Some trampoline springs extend only 40-50% before reaching their elastic limit. (e.g. a 10 inch spring can extend to 14 or 15 inches. Good springs can extend to 100% (E.g. a 10 inch spring can ...
Sherwood Botsford's user avatar
1 vote
1 answer
74 views

What are the external bars for on bank vaults?

I refer to the 3 radially spaced bars on this door:- and the two horizontal ones on this door:- Many (vault) doors have them, but since they're on the outside, what purpose do they serve? It looks ...
Paul Uszak's user avatar
-2 votes
1 answer
98 views

Is rain like bullets at supersonic speed?

https://web.archive.org/web/20230719190548/https://aviation.stackexchange.com/questions/100037/is-rain-like-bullets-at-supersonic-speed https://m.youtube.com/watch?v=Nv6ZqpM-5dY The video (a marketing ...
D J Sims's user avatar
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0 answers
31 views

Steel to aluminum structural equivalent

I am trying to build an aluminum trailer on an airbag suspension. The plans are for a steel frame and we are looking to construct it out of aluminum to save weight due to towing limitations. Not sure ...
Raymond's user avatar
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0 answers
91 views

How to design a spherical wrist for a robot?

I need a spherical wrist - where last 3 DOFs have axes that intersect - for a 6DOF robot arm, but I can't imagine the mechanics of 3 servos + brackets with intersecting axes. Is this even possible? ...
smirkingman's user avatar

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