Questions tagged [machine-design]
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31
questions
0
votes
2answers
29 views
Where water goes in split air conditioner system in “dry” mode?
In split air conditioners, there are two tubes connecting the indoor unit and the outdoor unit. According to the generic schematics I find online (like this one), they are part of the closed circuit ...
2
votes
1answer
56 views
How can I decrease strip tension with bridle rolls in tension leveller?
I'm working on a tension leveller design which consists of 3 main sections. These are
Input Bridle Rolls Zone: Increase the strip tension coming out of the decoiler.
Leveller Zone: Strip goes through ...
0
votes
0answers
29 views
How to disassemble this eccentric bushing
This eccentric bushing:
belongs to the hand crank of this machine:
It cannot be seen clearly in the photo, but the small blocking bar inside the bushing is not hovering over but rather, is sunk into ...
0
votes
1answer
49 views
What is this strange nut and what to do with it
I bought a cheap version of this machine, because all decent ones had costs of hundreds of dollars of transport to my region. The machine seems to be made of solid parts, but is really badly assembled....
1
vote
4answers
84 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 ...
0
votes
2answers
62 views
Looking for dropping servo mechanism idea
My friend and I have an idea to make prototype of vending machine.
We need suggestions for making strong dropping mechanism.
The idea is:
The user orders X item. Let's take a can of cola for example.
...
0
votes
1answer
39 views
Safety types and definition [closed]
I am searching for some Engineering terms but couldn't find any of the definition.
Direct safety
Indirect safety
Warnings
Thank you in advance
1
vote
1answer
45 views
What would be the best mechanism to rotate a plate from 0 to 15 degrees?
I'm designing a machine in a small university project that change position of a two-state gate. The two states shown in the Figure below are 0 and 17 degrees of elevation, correspondingly. The ...
1
vote
2answers
56 views
What does it mean for a machine design to be “kinematic”?
I've seen the term "kinematic" used qualitatively to describe machines several times in books and on YouTube. I think I understand what kinematics is as a study, but I'm not sure what people ...
0
votes
1answer
45 views
Is there any way to conserve energy for the following scenario of lifting weight?
A pulley can be used to provide mechanical advantage while lifting weight.
Suppose a combination pulley is made such that in order to lift something four times heavier, one can use the same force but ...
4
votes
3answers
155 views
What is “reversal” in mechanical engineering drawing?
I've come across these terms "reversals allowed" and "reversals not allowed" in a sample drawing while reading a GD&T course.
What exactly are these terms? What do they mean?
1
vote
1answer
62 views
Adding the effects of two rods to move a single rod
I have to deal with a situation where I have two parallel and completely independent rods whose motion is dependent only on external inputs, and I want to add up the lengths traveled by each rod.
My ...
1
vote
1answer
60 views
Bending moment when there are no constraints
I faced this problem in an old book (Hall Allen S., Theory and Problems of Machine Design; 1961)
The answer according to the book is 592 [in.lb], but I think the bending moment should be 0 because ...
2
votes
1answer
32 views
A device to provide real-time proportional resistance to variable force
I'm considering a potential product but I'm not sure about the core technology I'd need.
The fundamental idea is that there would be a cable (or something similar) that would be pulled. But as it ...
0
votes
1answer
34 views
Mechanical design of a bioreactor
What books and online materials exist that explain the mechanical design of a bioreactor? Can someone recommend any?
1
vote
0answers
32 views
Differentiating between Two Orthographic Projections
I came across the infamous control handle assembly in two different books, referencing the views differently. One of the had it like the following photo
The other book labelled the side view in this ...
1
vote
1answer
34 views
Reading Motor Datasheet
I'm doing my first machine design for a project and I have a Honda GX160 combustion motor which has the following specs for power and speed:
I'd like to use 0.24 HP at 2000 rpm. Is this possible? Or ...
0
votes
0answers
852 views
Toggle position of a fourbar slider-crank
In the fourbar mechanism as in the following picture, I have to find the toggle position, the sliding distance and the time ratio.
Here is my understanding/plan to do this:
The toggle positions ("...
3
votes
1answer
74 views
What mechanism is available to rotate a metal piece on another metal piece?
I am trying to find some type of mechanism where I can have a smooth but not too stiff rotation between two metal pieces. I was thinking of putting a shoulder screw through the pieces (the pieces will ...
1
vote
0answers
100 views
Fitting a sprocket on a small motor shaft
I have a bit of a newbie question. I've inherited a mechanical system, wherein the motor has a D-type output shaft with a diameter of 8mm.
(https://www.ebay.co.uk/itm/DC-High-Torque-Worm-Reducer-...
0
votes
1answer
75 views
Any books about design of complex machines? [closed]
I'm familiar with several books that deal with the analysis and design of simple mechanisms (such as Norton's Design of Machinery), including four-bar linkages, gear trains and cams. There are also ...
-1
votes
1answer
87 views
visualization of intersection of two objects [closed]
This is from a design entrance that I am preparing for. I know it's a little different than a theoretical projection drawing that engineering books usually cover. It is more practical and ...
0
votes
1answer
97 views
Analysis of Machine Frames With Cut Outs
I have a structure that is used to support two shafts which are carrying relatively high loads. It is composed of two columns and a "shaft supporting block" in the centre (almost acting as a beam). ...
0
votes
2answers
181 views
What kind of mechanism can be used to rotate a part in 180 degrees (ĪØ (yaw)) and 30degrees in 𝜃 (pitch) direction?
Let's say we have a flat object. We are asked to create some mechanism so that the part can rotate in the shown angles above. What mechanisms can be used?
0
votes
1answer
45 views
What are the different methods to join 2 parts so that one can rotate 180 degrees around the other?
Let's say we have one simple box and its bottom has been cut in a circular shape. We want to attach another box to this box that can rotate 180deg around the first one. What mechanism can be used to ...
1
vote
0answers
52 views
Springs on a pulley… When to use?
I saw a machine that fed a sheet of laminate through some rollers. The motor had a pulley attached to its shaft, and a spring connected to the pulley. Why not use a belt? Wouldnt the spring make it ...
0
votes
0answers
240 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?
3
votes
1answer
142 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 ...
0
votes
0answers
1k views
Bearing stress v/s crushing stress
What is "Bearing stress" and Is it different from Crushing stress?
If yes explain How?
and
When does an element come under Bearing Stress?
This question came to my mind while studying knuckle joint ...
1
vote
1answer
67 views
I need help identifying a special kind of coupling
I found this switchable coupling in Rollof/Matek machine elements, i have never seen this kind of coupling before.
According to the dutch edition its name is:
Tweevlakskoppeling
Which literally ...
0
votes
1answer
259 views
How to choose between two possible arrangements of tapered roller bearings?
I don't know how to decide between the $X$ and $O$ arrangement, i don't have any specific example at this moment, but i want to know.
Catalogues offer only some basic calculations. I'm not quite sure ...
