Questions tagged [design]

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4answers
39 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 ...
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1answer
82 views

Detachable tubing connections (joints) for frame assembly

I am looking into fabricating a steel tubing frame that needs to be dis/assembled (applies to many larger furniture like bed, shelving unit, wardrobe, cupboard, cabinet, ...). What are the variants of ...
2
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0answers
40 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 ...
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1answer
42 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?
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2answers
52 views

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

firstly, please don't post a technical answer as I will not understand it! Project is outdoor granite topped table. Table legs are two isosceles trapezoids crossed together at 90 degrees, with the ...
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1answer
47 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
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1answer
146 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 (PRD) for a new machine that I want designed. I need to ensure that I have included all the salient information concisely and to the point....
2
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1answer
44 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
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0answers
56 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 \...
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1answer
43 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 ...
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1answer
41 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 ...
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2answers
105 views

Coating brass components cheaply

I have seen a number of products made of brass with a silver-looking coating covering the brass on the outside. These products are all quite cheap (for example a small watering can or clothes hooks). ...
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2answers
95 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 ...
2
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1answer
312 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 ...
3
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1answer
76 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 ...
2
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2answers
544 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
60 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
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0answers
16 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 ...
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1answer
100 views

Z-axis auto adjusting fixture device

I am looking for a mechanism that would allow me to support a fixture attached to a 3-axis motorized stage. I have attached a picture of my current design. I trying to design/incorporate some sort of ...
0
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1answer
73 views

Designing PVC structure

I am an electrical engineering student that wishes I could have taken some civil engineering courses. Anyways I'm trying to design a pvc structure that I will use as a somewhat complicated room ...
3
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1answer
61 views

Why do transport containers for wafers open clockwise?

In the semiconductor industry and research, silicon wafers are transported in round plastic sample containers with a screw lid. Other than any other screw top though, the lid always opens (releases) ...
3
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1answer
47 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 ...
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1answer
60 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, ...
2
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1answer
58 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 ...
4
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1answer
81 views

Technical term for loose drawers jamming more readily than those with tighter clearance?

A loose drawer or loose sliding parts in general jam more easily than ones with tighter clearance. There is a name for this problem but I can not remember what it is, and searching for "loose drawer ...
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2answers
458 views

Could a bolt this size actually be used on a project?

could there ever be a structure that would require something like this?
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2answers
54 views

Predict egg drop outcome in random container

What elements affect the outcome of a raw egg drop in a random container? I’ve considered air resistance, mass, size of container, size and type of padding. Are there other elements?
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2answers
107 views

Designing a loaded voltage divider?

I was wondering how to design this circuit in depth, since I have no idea what to do.
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0answers
46 views

What is that 3D software

I was wondering what is the 3D software being use ( picture below ) Thanks in advance!
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1answer
27 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 ...
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1answer
33 views

Struggling to find solution: question 1 (Finding the maximum length possible of a rod with specific stresses in action)

Could someone please help with the problem below? Edit 1:My guess on this question is: when I plot in the formulas, the stress rooting from the bending moment overcomes greatly over the other ...
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0answers
37 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 ...
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1answer
57 views

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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2answers
51 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 ...
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3answers
89 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 ...
3
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1answer
367 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 ($V_s$) ...
0
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1answer
18 views

Force Required to Push an IV Pole

So I am working on a personal project that involves an IV pole. In a standard IV pole with lockable casters, there is still some give in the vertical section of the pole. If you apply a force to the ...
0
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1answer
38 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 ...
1
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1answer
154 views

What is the best heat and moisture resistant adhesive?

I have to join metal to metal (Aluminium or SS piece onto a vertical SS wall) that could take a shear load of say, 600gm with an area of contact of around 2cm^2. The environment is above boiling ...
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0answers
46 views

Building a custom indirect actuator, any thoughts?

I’m trying to create a custom indirect actuator, that is controlled by a microcontroller, for a custom robotics project. I have selected motor and gears (according to Fd = W = T2*pi) so that the ...
1
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1answer
195 views

How to couple two pistons to a rotating shaft so that the piston heads move like this?

Assume two vertical pistons with their flat head facing upward. Is it possible to couple them to one rotating shaft in a way that the position vs. time diagram gets like this? (This is one complete ...
2
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1answer
53 views

Power a microcontroler with a motorcontroller?

I have a motor controller that operates at 10-50V and draws 5A controlling a 3V motor that draws less than 1A. I had a an idea where I want to try to use a microcontroller to control this set up. The ...
0
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1answer
148 views

How would I get my hands on something I designed in Solid works?

Lets pretend I designed a plastic Lunchbox, like the ones pictured below in solid-works. What processes or options are involved in obtaining a physical sample of my design?
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4answers
6k views

Why aren't screens round instead of rectangular?

Screens on TVs and phones et cetera are always rectangular. Why? Why are they not round? Eyes are round. The Sun, the source of almost all of our light, is round. Telescopes have round lenses and ...
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0answers
32 views

Frictionless Braking System for 2 wheeler using electromagnet [closed]

I'm developing a Frictionless Braking System for 2 wheeler using electromagnet. My questions were How can we overcome the problem of braking at Low speeds. This type of braking tends to fail. How can ...
0
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0answers
35 views

Use of pulleys in gearboxes

I'm designing a simple gearbox with some fairly strict space constraints. I was wondering if having a belt pulley inside of a custom gearbox is a serious issue for the belt. Would it get worn down ...
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0answers
22 views

Simplifying the soda gun mechanism

I'm looking to design a push button mechanism similar to the soda gun where water is forced to pass through a single passage based on which button has been pressed. What are the different approaches I ...
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4answers
103 views

Why one big cargo ship is more efficient than 10 or 100 smaller ships?

Given the fact that small container ships are easier to manufacture than big container ships.. then why is it considered better to build bigger ships instead of many smaller ships? And to see why ...
3
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4answers
100 views

Rotation around an axis outside of the mechanism

I want to design a system of linkages that will allow me to rotate the green element around the blue point/axis without entering the red circle. The green triangle to go fully around the blue point. I ...
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0answers
57 views

What type to mechanical joint to achive Slide then Rotation motion

I have two parts (Green and red fixed) i want to connect them with a joint (Blue) that permit the green one to slide outwards then rotate. Side View (Right part) a simple pivot point doesn't work ...

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