Questions tagged [design]
The design tag has no usage guidance.
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Books and resources for an entrepreneur inventor? [on hold]
What books would you recommend for an inventor entrepreneur?
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0answers
29 views
Required diameter for ballast drop hole? [duplicate]
I'm currently an underground Geotechnical Engineer, don't spend a lot of time on the surface. I'm trying to find a reference or method for calculating the required diameter of a service hole. My Mine ...
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0answers
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How to calculate bearing loads in a two stage helical gear box?
Here P, Q, R, S are the bearings and G1, G2, G3, G4 are four helical gears.
The gear forces tangential(Kp), Axial(Ka), Radial(Kn) are known.
All the distances are known. The forces acting on bearing ...
2
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1answer
48 views
Help with cantilever table top questions
I'm hoping someone can help me with some questions to know whether or not the table can be supported by this design and how to calculate the length of the support runners and the width necessary to ...
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1answer
22 views
Tolerance on dowel pin length
Is the length of a steel dowel pin standardized to a certain tolerance? McMaster-Carr provides tolerances on the diameter of dowel pins but not the length. In the event where I want a dowel pin to fit ...
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1answer
58 views
Why all watches hands are stacked in that specific order ? Can it be changed?
It's just a matter of curiosity, but I find hard to justify why every single watch keep the hour hand below the minute one; from a user perspective, it seems a poorly design decision for those times ...
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27 views
Boron Carbide Shattering a Bullet
Does anyone know how this works? I hypothesize that the reason that the bullet shatters is that boron carbide is much harder than the copper of the bullet. Does anyone think that this may be made into ...
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0answers
29 views
How to prevent movement in this 3 DOF setup?
I have a 3DOF platform that I'm trying to make more stable. It's difficult to explain in words what the issue is so I've added a GIF below.
Any ideas of how I can get rid of this wobble? The DOF arm ...
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1answer
37 views
Designing a horizontal pressure vessel
The question reads
Design a horizontal pressure vessel with hemispherical head supported by saddle support and fitted with 2 nozzles welded to the head. It's used for storing and delivering fuel ...
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0answers
36 views
press fit ball joint
I enjoy creating mechanical designs but I am not a trained mechanical engineer.
I have a technical issue with a joint design that needs to be permanently retained using a press (snap) fit. Any idea ...
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1answer
50 views
Fillet weld strength calculation
I have 2 plates that are fillet welded to each other. How can I determinate the max force the weld can take before it cracks?
The plates are only welded on one side because the other side is not ...
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2answers
30 views
How do you read a blower/compressor curve with multi-curves for inlet guide vanes?
I am trying to apply an existing blower curve in a hydraulic model for a single stage blower with variable inlet diffuser vanes. The variety of curves shown on the plot does not seem to make sense to ...
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2answers
33 views
Dose adapter sleeve hinder the axial displacement of inner ring of spherical roller bearings?
This is supposed to be the locating bearing in my design, the outer ring is supported by the housing and a taconite seal (taconite seal is hidden). So it is fixed in place and can't move at all.
...
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1answer
39 views
How to make datum planes on a cone in Creo?
I am trying to make this
I was able to make the base feature but I am facing problems with the secondary features. So could anyone shed some light on how to make the datum planes on cones.
I made ...
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0answers
19 views
Calculating the proper power of a motor
I'm trying to build a filament extruder with some basic available tools and materials. Simply the main principle of the machine is to insert some amount of plastic raw material ( ABS in our Case ) to ...
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1answer
49 views
Base Support for a Tree house
I am building a tree house in my backyard and it is going to be relatively simple. There are no parts that require drilling into the tree. The whole house is propped up by four 4x4 wood supports. I'm ...
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3answers
65 views
Mapping of vehicle to its horn sound
From the "meep meep" of the smallest scooter to the "BLLLAAAAAGGGGGHHH" of the largest seagoing container vessel, vehicles seem to have horn sounds that, in an auditory way, seem to indicate their ...
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1answer
92 views
Resist rotation with friction or teeth?
I prototyped this attractive wooden sit/stand laptop stand
but ran into a problem keeping the legs tight enough to hold their position. There are 1/16" thick EPDM washers between the oak legs - the ...
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1answer
53 views
What is the maximum deflection and bending moment of a hinged hinged beam? [closed]
It is not a simply supported beam with one end hinged the other end with roller support. I am working on both the ends hinged beam. i.e at the two ends only rotation about z axis is allowed and all ...
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0answers
21 views
How to create custom thread with specific pitch and thread diameter in fusion 360?
The thread needs to be 7/16 thread diameter and 20 threads per inch(in BSP, British standard pipe thread).The standard size of threads supported in fusion 360(design software) is 11&12 in metric ...
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3answers
80 views
Is there any defined mathematical parameter that can give me the average distance of a volume to a point?
I'm currently trying to design a bulk-handling system which minimizes the distance from the bulk material pile(s) where the material is loaded (the volume) to the unloading platform(s) (the point), ...
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1answer
45 views
How to prevent an object doing a full rotation on a shaft
I basically need a block on a shaft to rotate between 90 degrees (vertical) and approximately 180 degrees (horizontal) counterclockwise on a shaft. I don't want the part to fall below 180 degrees. At ...
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1answer
33 views
AutoCAD 2019: How do I Find the Perfect Angles to Match Line Endpoints
I'm trying to match up two lines on a drawing I am doing, without changing the length of either line. There is a perfect set of angles to do so- I just don't know what it each. Is there a built in ...
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2answers
47 views
How to construct a compact linear Fresnel reflector
I have recently come across the concept of CLFRs, and I want to build one myself, as a private experiment.
I have a rudimentary knowledge of optics (which I'm sure I'll have to refresh on) - any ...
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2answers
63 views
Would connecting 100's of small telescopes into one huge telescope make for a significantly better telescope?
Not sure if this is a Physics related or Engineering related question, but imagine that we would take 100's of small hobby telescopes and somehow managed to point them all at the same point in the sky ...
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1answer
37 views
Wheel angle for turning
Given a car configuration with a length of L and width of W. If you can give the top left wheel an angle of A to turn A degree how do you derive the angle of top right wheel for turning . I know that ...
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1answer
54 views
How much force/torque act on a wheel of a vehicle when vehicle moves a constant speed and suddenly got a bump or jerk?
I am working on disturbance rejection technique in a vehicle of a wheel. Suppose our vehicle moves with a constant speed 15 km/h. Since roads are uneven in nature, suddenly vehicle got a bump or jerk. ...
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1answer
76 views
Finding the velocity of water flowing through a gravel filled pipe
I have a scenario where I have water flowing through a gravel filled pipe, and I need to find the velocity. The pipe is gravity fed (no pumps). My approach is to find the seepage velocity ($V_s$) ...
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0answers
42 views
How to connect shaft to gearbox?
I downloaded a 3D model of a planetary gearbox from Rossi website, so the 3D model is reliable. As you can see, there is no keyway on the opening of the gearbox, thus i can't connect my shaft with ...
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0answers
55 views
How Can You Calculate Force to Overcome Friction From an O-Ring Seal?
I essentially have a piston in a tube that is sealed with an O-Ring and actuated with a solenoid.
The friction of the O-Ring however, is higher than estimated (guessed as far as I can tell) by the ...
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2answers
88 views
What does it mean that a ball bearing can handle thrust load but a roller bearing can't?
I can't wrap my head around it so if someone could explain this to me. According to http://www.vncbearing.com/roller-bearings-vs-ball-bearings-major-differences/
ball bearings can handle thrust loads ...
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0answers
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What are the mechanical principles behind the kinematics spine of Herman Miller chairs?
I am trying to understand the kinematic spine working principles of Herman Miller charis (setu for instance) in order to apply it in other applications. Supposedly "The Kinematic Spine uses two types ...
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1answer
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Application of Bernoulli's equation between stationary and moving reference points
I'm working on a pipe design problem using Bernoulli's equation, from first principles. The pipe is from a water storage reservoir (point 1) and discharges into a river (point 2). These are my two ...
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0answers
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Why does my piezoelectric actuator stick at low temperatures?
I use a piezoelectric actuator on an experimental set up. At low temperatures (Lower than 0 Celsius), the piezo will freeze. Meaning, it will actuate about half way, and then stop moving. Other than ...
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1answer
90 views
How to design a casting machine?
I was wondering, what are the factors to consider or how to find the required technical specifications for the new machine?
For example, if we consider a design of horizontal centrifugal casting ...
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1answer
29 views
the possibility of a breakwater/seawall preventing the beginnings of a landslide-formed tsunami [closed]
. . A thought recently crossed my mind which I cant seem to find any studied material on. It occurred while hearing a story about a potential future landslide in Kauai causing a large tsunami aimed at ...
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4answers
3k views
Is it useful to stuff my glasses with newspaper to protect them?
(I'm not sure if this question belongs to this stack exchange, but it seems appropriate to me)
I have a very practical situation and our knowledge is lacking to be able to solve our debate.
The ...
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2answers
103 views
Design of multiple wood layers
I am currently working on designing a teeterboard for the circus (a seesaw that people jump up and down on the ends), and need some advice on my methodology for wood selection. The primary wood will ...
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1answer
151 views
Why is it more common to use ceiling fans instead of air pumps?
As the title suggests, why not use high-powered air pumps instead of ceiling fans to inject hot air from the ceiling down to the cold, bottom floor?
I understand it may seem silly (especially since ...
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1answer
58 views
How to determine tensile strength while the normalised tensile strength is known?
I try to design a shaft with yet unknown diameter, i know the distribution of forces and stresses (shear, torsion and normal) in/ along the shaft. I need just one more parameter nl. the tensile ...
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1answer
93 views
How to make an annular metal to metal snapfit?
I am designing a watch case and would like to know how to make an annular snap fit for the backplate. The material used is stainless steel. I could find references for Metal-plastic snap fit but I ...
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6answers
131 views
Why don't public transport networks have more routes to each terminal?
When using public transport, we often need to change routes in the middle of the journey. These changes have costs – I can think of the following, but there may be more.
If we're reading, working, ...
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2answers
91 views
How does the number of braces in a balsa wood tower affect the load capacity?
I am deciding between two design ideas for a project in which I have to build a balsa wood tower that can maximize load weight and minimize structural weight (maximize efficiency). I've included a ...
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1answer
67 views
Shaft Size design / replacement
does anyone have any idea what standard shaft size / adapter this is?
the motor is NEMA 56C and the socket size it self is 27.8 mm in diameter and 32 overall with the key.
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3answers
46 views
Belt tension to rotational force
This may be an obvious question, but here goes anyhow.
If you have two pulleys (different diameters) with infinitely strong bearings and shafts, does increasing the belt tension have any effect on ...
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1answer
56 views
How to work out how powerful a motor needs to be to climb up a tube?
I am designing a device that can climb up a tube. To do so, I am planning to use a motor that will utilize spinwheels with high friction.
How do I work out how powerful my motor needs to be?
The ...
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0answers
26 views
How does this steering mechanism work?
I can’t figure how this kick scooter steers/folds. I’m curious how it works because it has a major benefit by folding very compactly. The front wheel stays in place (doesn’t fold upwards like most ...
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1answer
86 views
Bearing and Bearing Housing for Said Design
The system that I'm working on has a rotating cylinder (cleaning head). It needs to rotate vertically between two arms, much like a cleaning brush in a car wash.
Note: I have not considered how the ...
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1answer
41 views
How do locks for shoe lockers in Sentōs work?
(Please move this question to the appropriate exchange site if it is not this one; I originally posted this here, and a comment suggested that I move it here.)
In Danganronpa it appears that the lock ...
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1answer
45 views
Relation between ride frequency and wheel deflection of a car
I am not able to understand the relation between ride frequency and wheel deflection of a car, as per given in Race car vehicle dynamics book by milliken. Is it something to relate with harmonic ...
