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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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9 views

Determining work envelope of spherical parallel manipulator?

I am designing a spherical parallel manipulator. I require a work envelope that is a cone, with 360° of full rotation and an opening of 90°. I am attempting to calculate using this work envelope what ...
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16 views

Repeating linear motion to extend/retract

I'm trying to figure out a way to have a repeating linear motion to extend/retract a yoke/piston. Something like a ratcheting rack actuating a scotish yoke. So sliding the rack one length would rotate ...
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2answers
31 views

Calculating the torque required to move and hold an arm parallel to the floor

I'm a computer scientist doing a dissertation in robotics and I'm designing a mechanical arm that mirrors a humans, as such I am wanting to pivot the entire arm from a "shoulder" using a stepper motor ...
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Assigning different thicknesses to single part - ABAQUS

I am trying to validate the results of linear analysis from RSTAB (structural analysis tool) with ABAQUS. The model comprises of approximately 800 members. Each member is composed of built-up sections ...
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1answer
31 views

Aerodynamics - How can you solve for mass when velocity & chord are not given?

My prof is the type who makes up his own questions (rather than pulling them from textbooks). This is his latest work... Anyone got any ideas on how to solve this? He assures me that you don't need ...
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18 views

Linear Motion Ratio on Eccentric Cam Pulley

If you have an eccentric pulley wheel and attach a rope to the top most vertical position and pull downward, the point at which the rope is fastened inscribes a circle with the radius of the distance ...
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30 views

Latest simulation software to design motorcycle

Manufactures do a lot of research into finding where exactly where they want the centre of gravity to be based on the weight of the engine and fuel tank. To make ...
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2answers
18 views

grey cast iron from freezing point to room temperature (cooling process)

Do grey cast iron expand from freezing point to room temperature (cooling process)?
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21 views

I need a mechanism/method to control a shaft that can rotate at different speeds. (faster clockwise and slower anti-clockwise)

I need to develop a mechanism - Where in I have a shaft that needs to rotate at different speeds. Lets say at a higher RPM clockwise and a lower RPM anti-clockwise. This shaft is attached to my ...
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21 views

How many columns per row did the Lorenz cipher teleprinter machines use?

"The Lorenz SZ40, SZ42a and SZ42b were German rotor stream cipher machines used by the German Army during World War II." I've been trying to find some details about the "specs" of these machines, or ...
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1answer
30 views

Can I submerge a pneumatic cylinder in oil?

I am looking for a linear pneumatic cylinder to raise and lower a fixed object. Everything will be submerged in oil (for electrical purposes). I am new to engineering and pneumatics in particular, and ...
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2answers
59 views

How do I determine what hardness to change the bearing or the track?

We have a project that requires us to use a qty of 4, Ø2" yoke roller bearings mounted two per side on a trolley that roll on a steel track. The maximum total weight that we estimate on the track at ...
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2answers
32 views

Can a Peltier's device (i.e.Thermoelectric cooler) achieve cryogenic temperature efficiently?

Does the stacking of peltiers device shows promising results in achieving the cryogenic temperature? I have tried doing the experiment, the overall temperature of the system increased around 80ºC and ...
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2answers
28 views

How to convert output of controller (control signal) into PWM signal?

I am trying to control a mechanical system with some transfer function T (output is position & input is voltage). I have implemented a state feedback controller in order for the output of the ...
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1answer
29 views

torsion spring applicaiton

I wish to rotate a short cylinder (thick disc) by 150 degrees. I chosed to use a double torsion spring for this (as the picture below). The picture shows only one side. I wonder if the above design (...
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25 views

How is d(Cl)/d(alpha)@stall and Cl increment to stall defined in Xrotor?

Edit: Someone answered me in the original post overhere. ;) I hope there are some people around here with some experience in Xrotor than me. (Xrotor is:"XROTOR is an interactive program for the ...
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2answers
52 views

How do those “dipole-shaped” weights attached to sections of electrical power lines work?

I see these frequently on tall power lines like the one in the image below, sometimes a single one at each end, sometimes pairs as are shown here. Sometimes on one side of the tower but not the other. ...
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2answers
46 views

How to remove protective valve cap from CO2 cylinder?

I have received a CO2 cylinder from an online seller fitted with a protective cap over the valve: I understand these should unscrew, but this one appears to be stuck very firmly. Is there a standard ...
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1answer
18 views

Formula for finding the optimal weight for a given torque and vice versa

Whenever i see videos of two trucks pitting with each other to see who has a stronger, i always see comments that sounds like: If you load the other truck more it would beat the other one That truck ...
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24 views

Calculate Roll from gyroscope (or fusion gyroscope with accelerometer)

I am working on a method to get the roll angle, while a device is moving. When I place my phone (or IMU) on a flat surface, it shows 0° roll angle. The problem is, if I make a lateral movement, the ...
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1answer
29 views

How would I do a buckling analysis with an additional fixed known lateral force?

I am using Nastran for buckling analysis, and I'm new to all of this so please bear with me. For a linear buckling analysis, I understand that you must first apply any compressive load in the static ...
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1answer
26 views

SINGLE supported beam

Let's say I have a beam supported exactly in the middle (like a seesaw) and a distributed force applied on it across the beam. What is the way to calculate the displacement, moment, shear...etc of the ...
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1answer
30 views

energy unit conversions

This is an HVAC mechanical engineering question on a document from a manufacture where they convert units of electrical energy to therms of natural gas. Carrier has writeups for building energy ...
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1answer
55 views

Could a bolt this size actually be used on a project?

could there ever be a structure that would require something like this?
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1answer
46 views

Optimal control vs. nonlinear control

I have tried to compare between two courses, and there seems to be some overlap, but not as much. Which method is better when controlling a nonlinear system? Also, what is the main difference between ...
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1answer
20 views

Estimating the quality factor (decay properties) of an object's vibrational modes?

I am attempting to model the acoustic behaviors of a circular membrane (drum head). I know that software like ANSYS will give me the modes of vibration pretty easy from a simulation. But what if I ...
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32 views

Insulating toaster oven

I opened my taster oven to make it stay always on instead of using the timer. I noticed that the space between cooking chamber and outter mantle is empty and Im thinking about adding insulation like ...
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1answer
53 views

What are these mechanical components called? (assuming they are standard components)

These parts were salvaged from a special mechanical calibration rig. I don't see anything that looks like that in McMaster-Carr, but perhaps I don't know where to look. The aluminum part is probably ...
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1answer
43 views

What happens if a star lock washer doesn't align properly with the nut?

If I understand correctly, one of the star's teeth is bent into one of 4 nut's slots to secure the nut. What happens if none of the teeth align with the slots? Do you unscrew the nut a bit? Or it is ...
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0answers
14 views

Electronic Pressure Control, EPC

In short, the question is: How the EPC affects an automatic transmission? I'm planning to build an automatic transmission controller module, TCM for 4F27E Ford transmission. So far I haven't found an ...
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0answers
10 views

What effect as a remote anguar torque on a central axis?

Here is the problem: Consider a central axis of rotation of a system which has an inertial momentum. Some force applied far from the axis could trigger a rotation of the axis, and three main ...
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14 views

In a sheet polymer/metal extrudate, why does the thickness varies while exiting the die and how much is the variation of thickness?

When a metallic or polymer/rubber sheet is extruding and leaving the die, it is seen that the variation of thickness occurs at the location of the die opening and at a distance far from the die ...
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2answers
60 views

Notching a throttle handle

I am emulating a throttle handle from a locomotive. See the diagram below for what I am trying to create. Its a throttle handle with 9 'positions' or notches (0-8 power). The handle will probably ...
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10 views

Calculating porosity of a sample with a specific number of particles whose size varies through a normal/ log normal distribution

I need to simulate a cylindrical soil/ rock samples in DEM. How can I know the porosity of the sample when I know only 1. The volume of cylinder 2. the total number of particles in cylinder 3.Density ...
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14 views

calculating volume of particles with a normal distribution in a cylindrical sample

If there are a certain number of particles in a cylinder. The particle size is a normal / Log normal distribution with a mean value of 1 and a standard deviation of 0.99. How can we calculate the ...
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0answers
27 views

What is the kinetic energy required to impact the surface of asphalt roads?

I am trying to find estimates of the minimum kinetic energy required to impact the surface of asphalt roads as a first-order impact assessment of road functionality to rockfall (i.e. boulders hitting ...
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3answers
566 views

How Much Efficiency is Lost in a Gear Train

I want to get a rough estimate for the transmission efficiency of two different gear trains. One is a one-stage gear train with 11.67:1 ratio (140/12 teeth) and the other is a compound two-stage gear ...
2
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1answer
53 views

Latch Mechanics

I want to make a sprung latch mechanism which keeps a door in place until a certain force is applied to the door. In the diagram attached, the force the door must release at is Fd, and the latch ...
2
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1answer
48 views

How to solve this linear motion problem?

Context: I have a lead screw rod, nut and a pulley aligned vertically. The nut is attached on top of the pulley so their respective bores are aligned and the rod is arranged so that it is threaded ...
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15 views

Good resources (textbooks) with steel S-N curves?

Looking for S-N curves for common gear materials (steel, cast iron). Are there any sources with multiple materials compiled together? Currently cobbling some charts but they're more inconsistent than ...
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3answers
42 views

Attaching Gear onto Motor

I want to attach a 12 toothed spur gear with a bore diameter of 6mm onto the shaft of this motor (6mm diameter). How would I go about doing this? From what I see, the shaft is smooth so is my only ...
2
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1answer
44 views

Trying to get a plane at a certain distance and angle

I'm working with solidworks and trying to make a plane at a certain distance and angle from another plane. Just for some context, I want to do something like this: My plan was to create a plane at ...
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1answer
34 views

How to select the correct Bolt/screw Torque for sealing?

My coworkers and I are finally testing our agriculture sensor on the field. As you can imagine, the moisture and dust are important variables to keep aside from the electronics inside our product. ...
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1answer
35 views

prevent shaft from moving in solidworks

i designed a gearbox with 3 shafts.i wanted to do sth so shafts only have rotating movement and not any other type of movement.i cant find any type of mate that can do that,any suggestions?
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2answers
1k views

SOLIDWORKS - 3D Sketch of Trombone

My task is to create a 3D Sketch of a trombone like the one below My professor recommended defining the points 1-4 and putting a spline through them. I did that, but my resulting design looks weird. ...
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1answer
35 views

solidworks mating gear with shaft problem

I am trying to mate a gear with a shaft via a key.key coincident with gear and cocentericity of gear with shaft cannot both be made.
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1answer
43 views

How the design of ship help to survive in the water

I have seen bigg cargo, and other ships, and I like their structure very much., a question come sin my that why the ship structure is like this. Can anyone explain what was reason for this. I am not ...
2
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1answer
28 views

What calculation to find how much force before tipping over?

I was thinking of building a free standing structure out of plumbing pipe that would go flush against the wall to hang jackets and other items. Attached is a sketch of the general thought of what the ...
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0answers
12 views

Basic dimension relationships in a valveless pulsejet engine

I'm willing to take my own shot at the construction of a blast supercharged valveless pulsejet, a holy grail among DIY jet enthusiasts. However, since my idea is not very compatible with the geometry ...
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1answer
16 views

Uses of orifice in Water Jet Cutting?

I wonder whats the usage of orifice/orifice plate in Water Jet Cutting Machines. To increase pressure(due to a smaller diameter with respect to the entrance cross-sectional area) or to convert to ...