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Questions tagged [mechanical-engineering]

Questions within the problem domain of mechanical engineering. Mechanical Engineering can be a broad field; consider choosing more specific tags if they apply.

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10 views

how does this z-axis micro-adjust lead-screw design work

The picture (which I found on the web without any accompanying explanatory text) shows a home-made z-axis micro-adjust lead-screw add-on to the vertical milling attachment of a vintage hobbyist lathe. ...
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17 views

why do they put a ring on a planetary gear and why dont they turn it with a gear in the middle

why do they put a ring on a planetary gear why don't they just put a gear in the center I want to know if the ring adds torque thank you if anyone knows
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28 views

Why is there no widely-used standardized unit for indentation hardness?

The last hundred years have seen a great degree of standardization of units, and the expression of units of measurement in standardized, instrument-agnostic, objective terms, often in the SI units. ...
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41 views

Delta Robot: Torque and Motor Sizing

Question: Is 56 Nm enough torque for a delta robot with the below dimensions and specs? If not, what would be the minimum torque needed? Thank you in advance for your help. I am working on a rotary ...
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1answer
37 views

The elastic module for a paper bridge

I have build my own bridge from paper and i want to know the elastic module for the bridge, my bridge is flat all over the way and cylindrical from the sides.
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11 views

Choosing Pressure Vessel head

Can I use a conical head at the bottom for a small diameter steam manifold ( Schedule 40- 3 inch dia. and 2 inch dia. ) that needs to operate at high temperature (~450 deg Celcius) and High design ...
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15 views

How to calculate the force required to move this water bot with certain speed

This is my project where I have created a river cleaning machine. It works fine but no actual calculations have been done regarding the power requirement of motors(A software engineer ). The machine ...
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1answer
23 views

How do I calculate the bite force of a mechanical gripper jaw? Which software can be used to simulate the same?

I plan to mount a gripper mechanism on a drone to grip a payload. How do I calculate the force generated by the gripper to hold a given weight. What simulation software can be used to simulate the ...
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1answer
49 views

How are water-tight transmissions made, like the kind you see on inboard boats, pumps or food blenders?

I want to replicate the kind of interface you see on inboard boats, pumps, or food blenders. Basically, I want put a motor in a sealed vessel, and have it turn a prop outside the vessel, in water. ...
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16 views

Extracting load info on Abaqus with Python

I have a model on Abaqus that I've managed to run some 85 jobs on manually. Between jobs, only the loads vary, and I select these loads by resuming what I need and suppressing what I don't with my ...
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1answer
20 views

How this agv rotates without rotating the payload?

How does the agv carrying payloads of huge heights as compared to it's size turn without turning the payload? Even if the body is attached to a center bearing, the bearing is very smooth then how come ...
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22 views

Motion of an object due to movement of ship

I wanted to know how the movement of the object floating near the boat would be like. I've assumed the following scenario: The floating object is at the location $(x, y)$. The boat starts moving from ...
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46 views

The optical encoder resolution

The optical encoder has a code wheel with a single track of slots and two photodetectors. The photodetectors are positioned so that they produce signals with a 90 degree phase difference. I want to ...
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2answers
20 views

How to configure strain gauges for tension measurement?

I have a machine which has belts with three pulleys, one of them is connected to the motors,the one in the middle moves to tighten the belt, and the third is idle pulley. This belt assembly sits on a ...
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1answer
47 views

How to rotate the blade?

I have developed a design for a river cleaning machine which can cut and collect weeds. The problem which is facing is how to rotate the circular blade which is attached in front of the machine. I ...
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1answer
25 views

small gearbox for experimental wind mill

The gear box will have little torque as I am only using a 12 by 18" wing which rotates. The two shafts I am using are 1/4 ", one form the wing and the other going the to pivot for the wing to circle, ...
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1answer
36 views

Measuring fracturability / airborne fuzziness of carbon fiber tow vs stainless steel tow

My friend uses carbon fiber tow in creating a component for automobile machines. However the carbon fiber is actually much tougher than it needs to be. As a risk manager in software I am concerned ...
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5answers
3k views

Does a motor suffer damage when resistance to the intended motion is met?

I'd like to create something similar to a hydraulic press. I know I need some sort of motor, but I was curious about a fundamental question about motors when used in a system where the force required ...
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1answer
39 views

Alternatives to sawstop technology

Sawstop table saw braking system works by putting a low voltage on the blade, and when it detects that voltage shorted to ground, the blade is retracted and slammed into an aluminum block. The claim ...
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0answers
41 views

how to calculate required torque and rpm to through a 160 gram cricket ball horizontally at 160km/h velocity?

I am going to design a bowling machine. In this design, I'm going to use two motors that are being placed vertically and their shaft are attached with two horizontal identical wheels with a space of ...
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1answer
30 views

Is there a bellows geometry that allows for torsional motion?

A typical folded bellows allows for axial expansion/compression, lateral offset, and angular deflection. Is there a bellows fold pattern that can accommodate a relatively large torsional rotation ...
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1answer
31 views

Break loose torque calculation of lock nut against rotating/acceleating bolts?

I have a Scenario where my lock nut is tightend using a prevailing torque of 14 Nm (as mentioned by the manufacturer) on to the rotor placed between bearings (But the tightening direction and the ...
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1answer
21 views

How do Test Indicator Flexible Holders hold rigidly when tightened?

If one were to search on Amazon for "Test Indicator Flexible Holders" you will turn up many items using this mechanism (please ignore the magnetic base; I'm not focusing on that part, just the red ...
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1answer
12 views

How does a monitor arm hold the monitor in place after rotating to a new position?

Not sure if an example is needed, but here is one. I'm curious as to how the joint connected to the monitor itself "remembers" the last position the monitor was moved to. In my naiveté, I imagine ...
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1answer
40 views

Motor, a gearbox and a drum with a cable lifting a mass

A lifting device consists of an electric motor, a gearbox and a drum with a cable for lifting a mass. The speed after the initial acceleration is $v=0.5\,\text{m/s}$. The gear efficiency $\eta=0.7$ ...
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0answers
9 views

Quality Control [closed]

Based on the finding from c (i), assuming that the process is normally distributed, identify percentage of packets that is more than 1.035 kg. (Calculate the Z value up to 3 decimal points and use ...
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0answers
15 views

Elastic potential field?

In classic field theory (e.g. electrostatic field theory) a "potential" can be associated to each point of space if we consider how the field interacts with a "test" particle (that is, a particle ...
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0answers
16 views

Ozone as an energy source?

Would an engine that electrically generates ozone from the oxygen in air then uses it as fuel be efficient or possible? (This is not a Newtonian question – we’re talking chemical reaction not ...
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0answers
25 views

Horizontal flanged connection in an atmospheric container

I have a round container that is open to the atmosphere. Vertical flanges see the hoop stress from the content as main tension force. We typically have Dead Load, content, Wind and Seismic loads. ...
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0answers
11 views

Does the air cushion on which the original hyperloop will sit require energy constantly or not

Does the air cushion on which the original hyperloop idea envisioned by Elon Musk require energy constantly to keep afloat, as the hovercraft does or would it be designed as the modern air suspension ...
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1answer
28 views

Can anyone explain calculation of net force due to pressure in a streamtube of fixed control volume and infinitesmal size

I am studying derivation of bernoulli equation from FM White's fluid mechanics and in that pressure distribution is as shown in the image 1. I am unable to understand force calculation as shown in ...
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1answer
26 views

(moulded) cast properties of the untreated surface

While my research about the untreated surface of moulded cast I read that the properties such as tensile strength, 0,2% proof stress and so on are different (much smaller) from the properties you can ...
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0answers
11 views

Standing wave node counter

I have a an assignment to complete this Term, the assignment consist in making a machine that would produce standing waves in various frequencies, (for example the typical motor connect to a string ...
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3answers
98 views

DOE analysis or root cause analysis?

For any testing that a part is suppose to pass a test, let's say the leakage test of a seal flange. How should I individualize the cause? I know there is root cause analysis and for different ...
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0answers
9 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 ("...
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2answers
47 views

Why does stress act a point instead of on an entire area normal to the stress?

I've often heard stress acts at a point and not on an entire cross-sectional area to which the load is applied normally. Im a little confused here, Let us consider an area of cross-section ...
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0answers
31 views

How do you calculate consumption given standard values in pneumatic cylinders (ISO 155552 Standard)?

The values I was given are: Force of advance= 50 kgf Total displacement= 3 cm Displacement= 45 seconds The Standards table I was given shows kgf/cm^2 so I should do 50/(3^2) right? Which is 5.6 ...
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15 views

Programmable motion on a metallic planar surface

This question is based on just a vague imagination. I am wondering if there is some way to programatically, make an object move on a planar surface in arbitrary paths (curved , swiggly lines etc) (not ...
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2answers
25 views

How to keep a symmetric-lens-shaped object upright using only wire?

Given a lens-shaped frame with a single crossbar running parallel to the floor, how could we keep that object upright and stable on one of its endpoints using only wire? The shape I'm describing is ...
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1answer
34 views

How to compare multiple data acquisition systems?

for an application of displacement measurement under 1 kHz, I have 3 options to choose from. the application is automotive. unfortunately I don't have deep electronics knowledge and the catalogues ...
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2answers
49 views

Difference between lead screw and worm screw?

I am confused whether a lead screw and a worm screw are the same exact thing. In my engineering workshop lab, they come up as separate things. For example, a worm screw is there in the indexing head ...
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2answers
58 views

What is the actual stress in a certain point in a body?

I'm reading my book on strength of materials and it says that the stress in a point depends on the orientation of the section that we are observing, and since there are infinite number of section that ...
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1answer
20 views

Elastic Modulus in Arbitrary Direction for Orthotropic Material

Suppose I have a material with an elastic modulus of Ex in the x direction and an Elastic modulus of Ey in the y direction. How would I find the effective elastic modulus in an arbitrary direction (...
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0answers
21 views

Design implementation of centrigual blower / compresser impeller - inlet/outlet ratio

I am designing a 3d printed impeller to go on my dust extractor, but while there is good data about the differences between forward/radial/backwards curved blades, there is very little on the best ...
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0answers
28 views

M thread as leadscrew

Hello I was searching net but can find information. I am doing a hobbyist project. I would like use shaft with metric triangular thread as a leadscrew. Can I do that? I know ACME will be loads better ...
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0answers
16 views

U tube manometer problems

A U-tube containing mercury is used to measure the pressure of an oil of specific gravity 0.8 as shown in Fig. 2.43. Calculate the pressure of the oil, if the difference of mercury level be 0.5 m.
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1answer
25 views

Do crank-sliders require some minimum amount of momentum to work in linear-to-rotary convertions?

I've been doing some reading into spinning wheels and old-fashioned sewing machines and so far as I can tell, they use a system similar to a piston in an engine. The main difference being, the ...
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1answer
35 views

Is there a linkage or other mechanism which can simulate a pivot, without extending that far?

I have a bar which I want to move as if it was pivoted on a point beyond its end. e.g. -------- * / / / / Is there a ...
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1answer
51 views

Question About Pumps in Series

I have a circulation tank that runs a piping loop out and back in with a motor pump on it to keep fluid constantly agitated in it. I want to add an inlet to the tank, so I can fill it without pouring ...
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1answer
22 views

what design features allow a milling machine to withstand lateral pressures against the bit

I need to cut a slot 4mm wide by 25mm long in aluminum tube with a 2.2mm wall thickness and a 35mm O.D. The tube is 250mm in length. It seemed a drill press with a fluting bit might suffice for this ...