Questions tagged [machine-elements]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
0 answers
26 views

Tension Arms In Watt Governors

I wonder why there is no tension acting at the arm connecting the flyball with the sleeve in Watt governors but it is only acting towards point P which is a pivot. Furthermore, the tension would act ...
user avatar
0 votes
1 answer
36 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?
user avatar
0 votes
0 answers
33 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 ...
user avatar
0 votes
2 answers
42 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?
user avatar
1 vote
2 answers
64 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 ...
user avatar
0 votes
1 answer
43 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%...
user avatar
  • 37
0 votes
3 answers
83 views

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 ...
user avatar
  • 37
0 votes
0 answers
48 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 ...
user avatar
  • 103
1 vote
3 answers
77 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 ...
user avatar
  • 11
1 vote
1 answer
57 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 ...
user avatar
0 votes
1 answer
39 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. ...
user avatar
23 votes
5 answers
5k 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 ...
user avatar
  • 2,185
0 votes
0 answers
142 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 ...
user avatar
2 votes
1 answer
320 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 ...
user avatar
0 votes
1 answer
28 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 ...
user avatar
  • 344
0 votes
1 answer
83 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 ...
user avatar
  • 119
1 vote
1 answer
395 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 ...
user avatar
  • 31
0 votes
0 answers
36 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 ...
user avatar
  • 115
0 votes
1 answer
53 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....
user avatar
  • 115
8 votes
2 answers
157 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 ...
user avatar
  • 200
1 vote
1 answer
79 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 ...
user avatar
  • 19
1 vote
0 answers
110 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 ...
user avatar
1 vote
1 answer
60 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 ...
user avatar
0 votes
2 answers
354 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?
user avatar
0 votes
1 answer
60 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 ...
user avatar
0 votes
0 answers
2k 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 ...
user avatar
1 vote
1 answer
72 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 ...
user avatar
2 votes
4 answers
719 views

Jet Boat Engine Part Identification

If anyone can provide me information about this part right here, please tell me.
user avatar
  • 21