Questions tagged [machine-design]

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20 views

What is the Hoop stress and bending moment relation

So I am working on a club telescope project. I have to design the tube for the telescope. So I found hoop stress to be most critical stress. The tube's bottommost end has a mirror and a mirror cell. I ...
36 views

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 ...
51 views

What is the hole tolerance in hand tap guide?

What is the tolerance for through hole to match the UNC 1/4-20 tap ⌀ 6mm? (tap shaft diameter ⌀ = 6mm) I want to make the diameter of the hole such that the tap stands in the hole and doesn't fall ...
• 103
43 views

Example of Extremely Tiny Amount of Horsepower

I just took an exam and messed up the horsepower calculation acting on a pinion and got 0.059 hp (correct is 1.67 I believe). I should be fine grade wise I am simply curious about an example of ...
18 views

Find stresses involved and calculate magnitudes

I am new to mechanical design.What all forces and moments act on the hinge plate in following figure?How to find magnitude of stresses induced on the supports? Note: The spring is an expansion spring ...
50 views

I want to calculate motor torque for lead screw mechanism like this (horizontal) I want equation to calculate this mechanism to find motor. I use this equation https://www.youtube.com/watch?v=...
16 views

What is the difference between side-channel/regenerative/ring/vortex blowers?

I am looking to write a Wikipedia article for side-channel blowers, but I have some big confusions that are not being alleviated by my attempts at research. There are certainly two distinct ways that ...
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1 vote
38 views

Static analysis of a lead screw and disc friction

I'm doing a static analysis of a square thread lead screw. I think this site gives a good description of the problem. Screw threads statics To calculate the moment on the thread the mean radius of ...
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87 views

Is it viable to "convert" petrol buses to electric?

As part of sustainable transformation, a city is planning to replace its fleet of 300 petrol-powered buses (part of its rapid transit system) to electric buses. 100-each were bought 7 years ago, 5 ...
• 121
51 views

I am looking to make thread changes to a handpiece for laser hair removal equipment

I am looking to make a design update to the threading of the main body hand piece (piece in which you hold) to the different size standoffs (basically pieces that position the laser beam at different ...
• 1
57 views

Proper way to mount a toolpost to a lathe

I recently bought a lathe of the A site that was quite clearly from China. It claims to be 8" x 23". It came with a turret style tool-post which, frankly, I don't want to deal with shims so ...
• 123
30 views

Identifying Marin Factors In Ansys For Fatigue Analysis

I am conducting a fatigue analysis for a mechanical shaft on ANSYS. Everything is fine except for defining marin factors. I am eager to specify some crucial marin factors, such as the temperature ...
1 vote
215 views

How do mechanical engineers, in practice, account for drag/air resistance when designing machines?

This is a question I've had on my mind for a while. I was recently looking at machine in operation: it was a machine which had a bunch of vertical spindles holding yarn bobbins, rotating at a high ...
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88 views

Serving for automatic vending machine

I want a serving mechanism for my vending machine. For my mahine, our product (fried ice cream) will fall into the air fryer and fry it, and then it will come to the plate or bowl to serve. I want to ...
33 views

Passive mechanical system to direct force and displacement into different ropes - Can this even be? (Mechanical transistor with direct actuation)

In this question I'd like to ask wether it is possible in general to build the following device. I don't come from an engineering background, so I'm probably not using the right words, but I'll try to ...
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34 views

Creating a custom made simple machine to dislodge extremely tight gas lifts from the mechanism

I am asking here because I'm considering designing a simple custom made machine unless I find a machine or a specialized tool that can help me pop off the gas lift from the mechanism. Most ...
• 101
28 views

Control and capture free falling grains

I'm a rookie engineer with experience in Fusion 360 and eagle. I am trying to solve a huge problem I'm facing with respect to capturing 360 degree images of wheat grains that are free-falling. I have ...
• 101
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 ...
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91 views

I am unsure how I would solve this. I have tried to solve it and got -29.1 but my attempt was wrong. Could someone please lead me in the right direction or show me the way to solve this? Thank you.
1 vote
52 views

Potential Problems of Excessively Hard Shaft

Will there be any issues if we make the shaft too hard? Hardness being a surface property may prevent surface scratches and wear, could it lead to any problems in general?
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1 vote
409 views

Infinite life of a material, Fatigue Strength

After 10^6 cycles a component is considered to have infinite life. What makes 10^6 cycles a deciding factor for infinite life? Why not 10^8?
62 views

Recommended method to connect sections of multi-piece crankshaft

I have prepared a crankshaft for a custom industrial machine - I am using an electric motor to turn the crankshaft. The crankshaft has multiple sections in order to accommodate some ball bearings. I ...
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1 vote
191 views

Doubt related to S-N curve

S-N curve is drawn from the results of fatigue test and fatigue test is conducted under completely reversed bending stress condition on a standard specimen. Is there any reason for conducting the test ...
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71 views

How would I calculate the bending stress on a structure like this?

The structure is a a linear and ratchet pawl and this is the free body diagram of pawl that is under bending and compression and I am just trying to figure out the bending stress caused by the moment ...
75 views

Where do I find mechanism for paper flipping and refeeding in printers?

I've started out in engineering and can't seem to find the mechanism in printers that flip and refeed the paper back for printing. There are a few engineering YouTube videos that show machine ...
1 vote
68 views

Why continuum robots aren't common on CNC machining processes?

So, I was searching on google/youtube about minimally invasive procedures and its tools to reach deep and delicate spaces of the human body, and it came to my mind the possibility of using it for CNC ...
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130 views

Where would I place a bearing between 2 surfaces?

I'm a high-school engineering student, and for my final project I wanted to make a robotic arm. However, I'm stuck on how to minimize friction between 2 surfaces (both made out of aluminum 6061-T6) ...
37 views

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 ...
20 views

A rotating, elevating platform driven by drive shafts

I have never built anything with gears before, and I find myself needing to do just that. Given that I have very little background, I'm mostly looking to be pointed in the right direction. The Task I ...
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124 views

Finding mechanical advantage and torque of a compound sprocket system

I was looking through some stuff on simple mechanisms, and the calculation of mechanical advantage and torque. I wanted to check if compound sprocket systems can be treated in a similar way to ...
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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 ...
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29 views

Soviet patent for a low pressure boiling washing machine?

I once (in the 1980's) heard about a Soviet patent for a low pressure boiling washing machine, that washed the clothes (without detergents) by reducing the pressure and then basically boiling the ...
24 views

How does bearing reliability factor effect the static safety values of a bearing?

I have a SKF 30202 style bearing and i found that the static safety factor of this bearing is 2.76 for a reliability of 90% how does the static safety factor change if my reliabilty was 99%? How can i ...
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50 views

"Cost fordest" and "Porded point" - meanings of terms

Not so long ago in our organization there was a seminar on machine-building issues related to parallel robots. The seminar was attended (in a remote format) by an Iranian-speaking colleague who spoke ...
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62 views

PVC Stripping issue on steel wire with pulley

I am having some issues with a PVC coated steel cable. The PVC often strips when used with a pulley. I wanted to know why this may be happening and possible solutions for it.
37 views

What methods can be used to stabilize a vibratory bowl used for orientation

I have a project where we are using a vibratory bowl to feed in parts to an assembler. The issue I am having is that the calibration sticker on the side is very out and a single line is very difficult ...
69 views

How holding force is produced in Jacobs taper for holding drill chucks?

How the wedge action produce significant holding force in a Jacobs taper for holding a twist drill chuck. (Even just sliding the tapered plug inside the sleeve by hand makes a rigid connection that it'...
1 vote
389 views

What is the advantage of "carriage"-style bearings for telescope domes, lighthouse lenses etc.?

19th Century technology sometimes involves large-scale bearings. I am curious about the "chariot"-style bearings used in lighthouse optics, and the similar bearings used to support rotating ...
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337 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 ...
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74 views

Will a lazy susan in the pan mechanism of my pan-tilt system be suitable?

Currently, I'm trying to up with a design for the pan mechanism. The pan-tilt system itself will be mounted with a couple different antennas such as yagi-uda and patch antenna. I'm designing the ...
209 views

Calculate hydraulic cylinder and pump forces on backhoe

I have a field find mini backhoe from a shut down manufacturer. The product is a beaver Pro QT50 backhoe used for small tractors, atvs, and pick up trucks. Unfortunately, there's no documentation on ...
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1 vote
73 views

What technology is behind a deep freezer door

I dont know if the title or question makes any sense but when i close my deep freezer i find it difficult to open immediately after closing until after about 2 minutes have passed. How is this done ...
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222 views

The generalized Lami's theorem

In statics, Lami's theorem is an equation relating the magnitudes of three coplanar, concurrent and non-collinear vectors, which keeps an object in static equilibrium, with the angles directly ...
121 views

Below is the dynamic analysis for a single rotating link which is driven by a motor. It shows the 2d front view and the 3d full view. The equations for the analysis require knowing the location of the ...
78 views

What is the relationship for the curve of the non-involute portion of a gear (below the base circle)?

I'm in the works of writing my own gear program, but I've stumbled on something that textbooks and the internet don't seem to answer. A lot of the time, the dedendum of a gear cuts into the base ...
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76 views

Question about engine reaction torque from gas forces

in the figure below the reaction torque equation is given by Fg41.x trying to rock the ground plane about the O2 pivot due to gas forces . My question is if the piston with the cylinder whole assembly ...
74 views

Failure criteria for CFRP single plate bolted joint

Which equation can be used to find failure based on ply orientation. Tension,shear & bearing faliure to validate against fem analysis
1k 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?