# Questions tagged [machine-elements]

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### I was solving fluctuating load problems and the word "static" confused me

Here's a snippet of the question that was asked a couple of years ago in university exam: A cantilever beam made of cold rolled steel for which ultimate tensile strength =540 MPa and Yield tensile ...
67 views

### How do cars move, it seems inexplicable (to me)? [closed]

Confiteor, I have only a rudimentary knowledge of how machines work. I'll be discussing fossil fuel engines only. First off, I have a block of iron, B. I find a pan balance. I place B in one of the ...
• 97
30 views

### Removing chips from plastic threads

hello! I have this thread, in the middle… and it’s a bit hard to reach with tools. Do anyone have any tips to removing them without causing any damage to the surface or the thread for that matter
41 views

### Dropping individual grains of sand at a constant rate

I want to build an optical sorting machine that uses air pressure to sort out sand (small amounts, a few grams, varying about 250-750μm in size) of a given color. This requires sand to pass past a ...
• 111
168 views

### Tolerances for machining retaining rings on shaft

I am designing a section of shaft that will hold a 1.25" wide sprocket. I found The snap ring vendor states: Fits Groove Dia. 1.886 in Fits Groove Width 0.068 in The snap ring has slightly ...
• 122
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### Operations between rotating elements

Given two (or more) rotating elements, which mathematical operations can be done between them? For example: Different gear ratios can be used to multiply a rotating element's angular velocity by a ...
99 views

### What process is involved in freeform 3D tube bending?

I have seen 3D freeform tube bending in videos such as this, this, and this. I would like to ask what process is involved in such machines. I can see a swivel mechanism used for bending. What is it ...
• 101
25 views

### Best way of SolidWorks rendering for product catalogs

For a catalog of many different parts I want a clear render but not as 'realistic' or detailed as I would get with SW Visualize. Are there any other options or settigns to achieve this? Some examples:
325 views

### Cam-operated clamps: When are logarithmic cams preferred and when are involute cams preferred?

Logarithmic cams are used in rock climbing, but involute cams are used to clamp work pieces when machining. Why are cams with two different profiles preferred for these two applications, which seem ...
• 67
971 views

### Is it essential for two meshing gears to have even number of teeth?

Should the teeth of meshing gears be even rather than odd numbers? If not, which is better?
147 views

### Best type of pin to use when two parts are rotating relative to each other?

[Edit 1]: Added material of components. I have a flywheel with a shaft connected to it. The shaft rotates with the flywheel, but also rotates relative to it, to give me a kind of camshaft motion if ...
71 views

### Question about cam follower design

It's always said that jerk function should be smooth to avoid undesired vibrations. What exactly is the vibration in a cam follower mechanism and why is it important to avoid it?
1 vote
293 views

### Is Smith Diagram and Modified Goodman Diagram the same? And how does one construct it?

I am confused about the names. Moreover, I haven't found any textbook which attempts to show step-by-step construction of these diagrams. I would be happy if anyone pointed to some textbooks or even ...
240 views

### Unable to understand minimum length of engagement for bolts

I've attached a snap of the part I'm unable to understand Machinery's Handbook 29th Edition. Here's a link to the ebook as well https://www.vtc1.org/cms/lib/PA03000913/Centricity/Domain/21/Machinerys%...
• 37
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### Does the nut experience the same forces a bolt experiences but in opposite directions as reaction forces?

More specifically, if I have an eye bolt being used to lift a body, I can find the various stresses acting on the bolt, but I want to know what happens to the threaded area of the body where the eye ...
• 37
52 views

### What else can you call an acme fitting?

Selling products on Amazon, I've had a listing pulled over "trademark violation" for mentioning that an HVAC sets come with acme fittings and/or acme adapters. a) Is there any way that this ...
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1 vote
90 views

### Why actuators are mounted in inverted position?

Hope you are doing good. Can anyone please explain to me why actuators are mounted in inverted position on some excavators? Please see the image for better understanding of my question. Another ...
• 11
1 vote
61 views

### What should be the thickness of machine tool bed?

I am developing Five-in-One machine tool which I did as a project working during 1984-85 in our Polytechnic college. Even though we made prototype at that time, now I want to make prototype for ...
148 views

### Force Transmitted to the support (Vibrations)

Consider the spring mass dashpot system shown below which is acted upon by a harmonic excitation force F(t). The reference is taken at the equilibrium position of the system when no F(t) was present. ...
8k views

### Why exactly does a washer help distribute the stress around a bolt?

Usually the reason for having a washer under a bolt head is stated to be that it helps to evenly distribute the stress to the clamped material surface. But why is this? I would understand if the ...
• 2,259
778 views

### Number of Kinematic Pairs

Kinematic pairs are the connection between 2 links that can have relative motion between them. But In six bar chain as shown below: There are five pairs for them to be a kinematic chain. But if I ...
1k views

### Relation between links and pairs in Kinematic chain

I came across a equation for kinematic chain (for lower pairs only) : L = 2P-4 where L: Number of Links; P is the number of pairs how could this equation be derived ? EDIT: I tried putting values in ...
64 views

### How to find a reference line for " Form Tolerances"?

In my project I have to choose a form tolerances ( parallelism ) between the handle ( purple part ) and the part that sits inside it ( the grey part ), where the two parts slide on each other. But I ...
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253 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 ...
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1 vote
1k views

### How can I decrease strip tension with bridle rolls in tension leveller? How can I find total elongation after the strip exits initial bridle rolls?

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 ...
• 51
55 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 ...
• 126
56 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....
• 126
224 views

### What is the name of this particular mechanical linear position switch made of perforated spring strip?

I'm writing a few elementary paragraphs about switches and switch technology, and I cannot for the life of me remember what a particular kind is called, to give it an honorable mention. Here is a ...
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1 vote
91 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 ...
• 19
1 vote
405 views

### What is the difference between sommerfield number and bearing characteristic number in bearing design?

After reading a few texts on the topic of sliding contact bearings I am confused between the bearing characteristic number and the sommerfield number. As per J.E shigley's text both bearing ...
• 183
109 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 ...
• 121
883 views

### What kind of mechanism can be used to rotate a part in 180 degrees (Ψ (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?
180 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