Questions tagged [design]
The design tag has no usage guidance.
406
questions
0
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0answers
9 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
71 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 ...
9
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
45 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
23 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
7 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
53 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
19 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
61 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
111 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
86 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
42 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
38 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
67 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
51 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 ...
0
votes
4answers
63 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
44 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
82 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
459 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
30 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
44 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
114 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
114 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
53 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
823 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
55 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
60 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
69 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 ...
2
votes
4answers
132 views
Is this dropout design as bad as I think?
I bought a 1990's steel mountain bike a few weeks ago and I have some concerns about the design of the rear dropout, pictured here:
It seems to me that an ideal dropout design would redirect upward ...
0
votes
1answer
58 views
How do I interpret this DC motor datasheet?
Problem summary:
I need to produce about 0.289 Nm with a rack and pinion system and compress 24 mm of a 110 mm x 21.6 mm, 0.99 N/mm steel spring.
I thought about using with a 10mm pitch diameter gear ...
2
votes
1answer
54 views
Power Electronics Project
Can I use 220-12v,1.5 Amps Stepdown transformer along with 12V 2A (KBP200) bridge rectifier to build a charger for 12v, 7.5AH battery or I should use transformer with Higher output, maybe 15V
2
votes
0answers
73 views
Advice on spring launcher project
I found an ingenious design of a spring ball launcher on grabcad and I'm interested in adapting it to accelerate a $43.7 \mathrm{~mm}$ diameter, $45 \mathrm{~g}$ golf ball enough to reach $65.5 \...
1
vote
1answer
68 views
Jamming & linear guiding
For a linear guiding I need to know the concept and understand the jamming limits. See picture. If I choose concept 1 or concept 2, what will be the value of X? How can I calculate this?
0
votes
1answer
55 views
Mounting methods for thin wall cast aluminum
Having a cast aluminium enclosure with the 3mm wall thickness. now I need to mount this to a mounting plate which fixed in vertical walls. can I have some idea on how should I choose the appropriate ...
1
vote
1answer
44 views
Why isn't there yet such a thing as a “Minimum Life Module” standard and concept deployed? [closed]
Why are large companies not producing, selling and maintaining the concept of "Minimum Life Modules"? What I mean is a standardized "module" hosting exactly one human being, with ...
1
vote
2answers
65 views
Multiturn rotational limit switches
I would like to automate a door lock. For reasons I won't get into, I'm not allowed to modify the lock itself, I can only attach things to the "safe side" of the door. On this safe side, ...
2
votes
0answers
20 views
What is the relation between the angle of a bend along one axis and the length of a face perpendicular to that bend
Sorry if the title doesn't make sense, I just cant think of how to word it so I'm going to be using images to help.
Basically I have a piece of sheet metal that I have bent along one edge to give me a ...
3
votes
1answer
81 views
Gas kitchen stove in skyscrapers
I have watched a property tour around an apartment in the Steinway Tower (NY) on YouTube and I noticed one detail that bugs me, namely gas stoves.
In Poland it is very uncommon for new blocks of flats ...
1
vote
1answer
139 views
Simple Flour Dispenser
I am trying to make a simple dispenser without using any electricity. I just want to create a simple dispenser that dispenses flour with the turn of a knob. I am creating this because wherever I bake, ...
0
votes
0answers
51 views
What is that 3D software
I was wondering what is the 3D software being use ( picture below )
Thanks in advance!
0
votes
1answer
28 views
How to reduce surface friction when pushing a gear sideways in shaft direction
I'm thinking of a system where a gear engages and disengages by shifting it along the shaft axis. I want to use an arm/board from a servo to push the gear in and out of position, but I'm worried about ...
2
votes
0answers
42 views
Overcurrent protection, limit for nominal current or stall?
Background: I'm currently working on a robotics design that will drill through soil.
I have selected a 48V motor who's nominal current is 3.17A and has a stall current of 42A. I will be driving the ...
1
vote
2answers
58 views
Trouble with an actuator on a Robotics SolidWorks design. Any ideas why?
I am in the process of developing a robotics design on SolidWorks.
The goal of this design is to tilt a platform using 2 actuators.
My design utilizes 2 indirect actuators that are separately powered ...
0
votes
1answer
41 views
How to lock a wheel bearing a load in place?
I'm designing a counterweight system that lifts a single load (max 55 kg) from above. I've narrowed down what to use to link the load to the counterweight to two options:
Timing belt
Roller chain
...
