Questions tagged [design]

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22 views

Why don't they make bigger M16 rifles for 7.62mm? [closed]

I heard that once they had a need to make a new rifle, M16, the military force asked makers to fit it as 7.62 ammo, not 5.56. Whatever the reason, I don't remember, they had to make it for 5.56, which ...
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2answers
18 views

Press brake tooling for 360 tube?

I’m trying to find out if it’s possibly to form a cylinder or tube with a diameter of 1 inch using some kind of curling die for a press brake. I’ve seen dies that make small 360 degree bends like that ...
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21 views

Optimization of ash stockpile height to minimize haul truck fuel costs

How would I find out the optimum height of an ash stockpile in order to minimize diesel haulage costs, for a CAT haul truck? My stockpile height is required to be between 25m to 50m. I have worked ...
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1answer
19 views

ElectroMagnetic Pulling Force fdropoff with distance

I am looking make a quick and dirty test ring using an off the shelf electromagnet. My force needs are small, less than a pound but I need to do so in a non contact manner. I know these magnets are ...
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1answer
20 views

How to design a magnet to handle a known force?

There is a metallical structure. I can estimate how much steel are in it. I would like to know how tall/strong a magnet should be to maintain a certain object to the metallical structure. The object ...
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18 views

How to connect a cable comb to a metal panel?

I have some cable combs, that looks roughly like https://images-na.ssl-images-amazon.com/images/I/71OiqN4CP1L.SL1100.jpg except with a flat bottom, cut from acrylic (ideally 5mm thick). I need to ...
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1answer
22 views

Slab Stiffness Modifiers applied in Vertical Elements design but not in Slab design?

Why in the design of vertical elements (columns and walls) for a structure against lateral loads (such as seismic and wind) we use a slab (or shell) with a stiffness modifiers (such as 0.25 according ...
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1answer
24 views

Drop Panel Design Above Columns?

How to design a drop panel at a column in case the column above is rotated or not aligned to the below column (see image below), the code that i am using is the ACI Code if any reference for the ...
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1answer
34 views

What are the essentials of a good PRD (product requirements document) for a new mechanical device

I need to write a non technical product requirements document for a new machine that I want designed. I need to write a PRD, and I need to ensure that I have included all the salient information, ...
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1answer
26 views

Friction factor for wormgear design materials

I'm working on a database which involves geometric design parameters, forces analysis and efficiency and losses for wormgear reduction design systems. To determine the tangential and axial forces ...
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2answers
927 views

What is the difference between washer and O-ring? what is their advantages over the other?

I am designing a hydrophone, from the piezo buzzer. To hold the circular piezo plate, I have designed a mechanical fixture. I need to use washer/o-ring to make it leak-proof. I am confused about which ...
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18 views

How can I model two attached rotating rings?

I am trying to model an object in which there are two rings who are attached to each other and can rotate independently along the Y axis (see attached image). The object needs to be machined and not ...
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8 views

How to calculate new focal plane position when adding a lens to a lens system?

I am currently struggling with some lens equations. I hope this is the right place to ask such questions. What I'm trying to accomplish is to add a separate single lens to a camera setup and ...
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0answers
29 views

Is an Adjustable Stiffness Flexure Spring possible?

I have recently discovered flexure springs (see image below), and I am interested in using one in an amateur project I am building. However, I would prefer if I am able to adjust the "stiffness" of ...
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21 views

Matching Air blower CFM vs HEPA filter CFM, and ΔP in WG, for laminar flow design

I am trying to build a laminar flow box using instructions at these YouTube links for design and build. They recommended getting a Dayton squirrel cage air blower model 1TDU2 rated at 1202 CFM. The ...
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2answers
53 views

I've never seen this type of flexible coupling, can someone tell me what it's called?

Putting together a project, I've found this clutch but I've never seen this type before. It has a sort of flexible plate connecting the two parts, attached to both in two places corresponding to where ...
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1answer
72 views

Could boiling water inside a semi-enclosed pipe be a low-cost method for a silent marine propulsion system? (redesigned)

I am wondering if boiling water that is trapped inside of a semi-enclosed pipe would be a low-cost method of creating an underwater thruster that would function as a silent marine propulsion system. ...
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1answer
32 views

ANSYS Design Modeller more significant figures

I need to just get the volume from ANSYS Design Modeller but I would like a higher number of significant figures rather than just 5 (See picture). How do I do this? Thank you for your help!
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21 views

How to detect milk spillage or milk boil?

In my country we generally boil milk before we drink. Often the milk heats up and spills from the pot. I want to detect milk boil before it spills off.I am thinking of a thermal camera solution that ...
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2answers
53 views

Designing a 1-button system allowing for a differentiated control of 2 different valves?

I'm in the processes of building something which requires I'll be able to control the independent opening/closure of two (small, ~10mm in diameter) different adjacent holes using one finger, and I'm ...
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1answer
33 views

Master/Slave Gear Mechanism for Navball

I am designing a functional replica of the Apollo FDAI (aka 8 ball). See pics Real FDAI Another view From the Apollo 8 Flight Journal: The FD/AI (Flight Director/Attitude Indicator) or "8-ball" ...
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1answer
35 views

Designing Block Diagrams For Control Systems

I'm looking for good software to design control systems, and more specifically to neatly design "block diagrams" for control systems. Is there something like that?
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17 views

Help finding connector to fit 1 3/8in / 35mm mounting flange on horn driver

My project is a DIY talkbox using Monacor KU-516 compression driver. I'm having a hard time finding the right connector to fit the hose to the driver, M35 is a rare size it seems. There's one ...
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68 views

Machine Frame Design

How do I select the cross section for a machine frame? Do I need to refer to the AISC steel construction manual to find the capacity of beams, columns, etc?
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1answer
22 views

Spring Industry Naming Convention

I am currently prototyping a part for a personal project. My CAD design was contracted out and there are some off the shelf parts that I need to order per the design (springs, screws, etc.). My ...
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3answers
32 views

Design of Gating & Runner system in Gravity Die Casting

How to design gating and runner system in permanent dies so that material flows smoothly throughout the design without spilling back from the gating channel. What should be the shape of gating system ...
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1answer
19 views

Bonding PVC Cables To Metal Housing

I have thin, variable diameter PVC wires that run along a metal housing. Problem being, they can get pulled on and disconnect. I want to bond them down to the metal housing as a sort of strain relief ...
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1answer
52 views

How do i find the effective length factor (k) for a column from this chart?

I need to find the effective length of a column (kl) from this chart which can be found in the "design of concrete structure" By Dr. Arthur Nilson. the question states "if Psi top is 1.5 and the ...
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1answer
20 views

Selection Of coupling and determining size of motor to rotate heavy disc

Following image is something I want to design. The uniform stainless steel round plate of diameter 1000mm and thickness 10mm is rotated by a stepper motor. But after every turn, a pressure of 3000 kg/...
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1answer
67 views

What mechanism do I use for this pen-like design?

I am trying to make a pen-like product that moves out fluid from its tip for some special chores, but I am having issues about the motion of the clutch. The picture you see is a sectioned concept ...
2
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1answer
44 views

Buckingham-Pi Dimensional Analysis when there is a non-dimensional parameter: How is it accounted for?

I am in the process of completing a design project for my fluids course in which Buckingham-Pi /Dimensional Analysis is needed to find the optimal parameters needed to achieve a rotational rate of 120 ...
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1answer
65 views

Pneumatic-based, paddle wheel-type lifting apparatus for aircrafts

I am wondering if a pneumatic-based, paddle wheel-type lifting apparatus would have any practical application within the aeronautical or aerospace fields. Please reference the conceptual drawing ...
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3answers
72 views

Dead mans brake on a hand-pushed wheelchair

Would it be possible to install a dead-mans brake on a wheelchair? I have been calling around and wheelchairs do not seem to come with a dead-mans brake. With that i mean the brake found on airport ...
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1answer
41 views

Use 4 to 5-second timer to disengage/engage mechanical system

So I am working on a project. I need a drone (quadcopter) to ascend for 5 seconds, then cut off power to the drone, then let it stay in the air for as long as possible without power. My idea for ...
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0answers
29 views

How to change the direction of the force with a high resolution

I have a sample of 600 milligrams which is supported by a rope. So the force is in the vertical direction. Now I want to change the direction to the horizontal direction while keeping the force equal(...
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27 views

Will a video projector submerged in mineral oil still work?

I’ve seen folks submerge computers in mineral oil to cool them- but would doing the same to a video projector profoundly throw off its internal optical aspects? I’m considering one of those small “...
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1answer
50 views

Why vehicle horns are tuned to consonant intervals?

The primary purpose of a vehicle (car, locomotive, etc.) horn is to warn other traffic units that something potentially dangerous is about to happen. And so, others must pay attention to the signal. ...
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1answer
71 views

Should the corbel angle always be estimated as 60 degrees in masonry construction, or is there a formula to use instead?

In educational construction material as well as engineering publications, the corbel angle for significant excess loads, and also for substantial openings, in an ordinary brick wall is usually ...
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40 views

Design assistance

How do I make that encircled pattern in AutoCAD 2018 without going through a lot of hassle? I mean those thin lines indicating that the object has been cut. Looking forward to all positive responses. ...
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1answer
58 views

Regarding design of fixation of a part

I would like to know if there is any theory behind designing the fixation for any part. To optimise the number of mounting holes and fasteners. If so what is it called and where can I get it? Please ...
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0answers
28 views

Screw Cap design for high pressure surge vessel

I'm designing a pressure vessel with a relatively large cap that provides access into the vessel, what recommended thread specifications is needed to maximized locking and safety against faliure or ...
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1answer
28 views

How to model a driven wheel with no slip

I'm working on a design problem, and I'm having trouble figuring out how to model the torque needed to drive a bike tire at a set acceleration. Let's say I have a tire with normal force between tire ...
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0answers
31 views

Designing a submersible cooling system for rapid flow hot nitrogen gas [duplicate]

I'm trying to design a cooling system for cooling nitrogen at 300°C. My original design (which is very open to modifications) is an aluminum ring block with exterior fins and vertical holes through ...
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3answers
104 views

How are dangerous to build things studied?

How are dangerous to build things studied? Such as, nuclear reactors, jet engines, sawing machines. How do engineers discover, how they ought to be built, while avoiding getting or getting others ...
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1answer
54 views

Designing cylindrical cam

So I need to design a cylindrical cam (aka barrel cam I think). I'm an aerospace engineer so I've never had a course on cams/gear design (wish I had though). Is there a general equation for the curve (...
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1answer
33 views

How to get precision with a small gear?

I want to be able to precisely rotate a item. For this I have positioned the item on top of a very large gear. It is driven by a smaller gear. When the item is in the correct position, I will lock the ...
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1answer
37 views

Issues creating a high pressure chamber for corrosive solution

I'm trying to do an experiment on high pressure's effect on the electrical impedance of a really corrosive solution. I'm aiming for at least 2,000 psi with a pressure chamber but the only material I ...
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3answers
61 views

Cheap low-temperature oven

I'd like to make an oven for curing adhesives that require an elevated temperature for a proper cure. I'd like for the temperature to be settable from 60 degrees C to 75 C plus or minus 5 degrees over ...
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1answer
84 views

Could a spinning permanent magnet's interaction with the Earth's magnetic field propel a boat through the water?

I am wondering if a spinning permanent magnet's interaction with the Earth's magnetic field will produce a propelling force strong enough to propel a toy boat through the water. This propelling force ...
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2answers
78 views

Racing cars have spring with constant rate whereas Off road vehicles have variable spring rate [closed]

In the term of machine design and mechanical engineering. If same spring is to be used in both smooth and rough road what will be the effect in suspension of the vehicle and if instead of using same ...