# Questions tagged [mechanical]

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687 views

### Quick return mechanism for spring-loaded screw

I am looking for a way to convert rotary motion to linear, but it should take less energy to get back to initial position than when going from initial position to the end position. Specifically, a ...
• 93
263 views

### How is motor torque related to capstan equation?

I know that capstan equation relates $T_{in}$ and $T_{out}$ as $T_{out} = T_{in}e^{u \cdot F_c}$, where $u$ is friction coefficient and $F_c$ is wrap (slip) angle. In my situation, the capstan is ...
• 51
43 views

### High articulation joints

Looking for advice or suggestions for high articulation joints (>57°) for an automotive halfshaft. Peak operating conditions are in the ballpark of ~1000RPM, ~300ft-lb torque. I've considered u-...
• 121
35 views

### Is inverse hall-petch relation valid crystals larger than nanocrystalline?

The image shown here is of ceramics, where they varied the grain size and measured the strength. For example, let's take Al2O3. There we observed that strength first increased from 3 μm to 95 μm. But ...
508 views

### How to calculate torque requirement for vehicle with Mecanum wheels?

What changes are specific to mecanum wheels when calculating torque requirements for a vehicle? I have the vehicle's mass, top speed and acceleration data.
45 views

### Epoxy/Adhesive to bond solid wood and acrylic

I am trying to bond solid wood with with clear acrylic, with requirement to able to withstand shearing force, not more than 6kg over an area of 100 sq.cm. Have tried to bond with result of the ...
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1 vote
32 views

### Vorticity vs angular velocity

In fluid mechanics, I got confused by the two terminologies, as both seem mathematically and physically similar. Vorticity and the angular velocity in the concept of fluid are the measure of the ...
• 11
1 vote
33 views

### How to estimate the rounding torque of an allen key socket?

I can't find an example calculation for the maximum torque of an allen key socket (the female bit on the screw head that the allen key goes into) anywhere online, or in textbooks, can someone point me ...
1 vote
31 views

### Single millinewton strain gauge suggestions

I am working on a project where the precise & accurate measurement of single millinewton forces has become a significant boundary. Is there a cost effective device that is able to measure such ...
• 11
1 vote
36 views

### Cryogenic pump - why is this part slotted?

What is the purpose of that slotted area? In my opinion it is done that way in order to prevent it (the impeller) from sticking to the pump body in case it is not properly cooled down. Some people say ...
1 vote
155 views

### how to interpret ISO2768-mK angular tolerance

How to apply tolerance for angle based on ISO-2768-mK? Cause I am confused about the statement "Permissible deviations in degrees and minutes for ranges in nominal lengths". Lets say I have ...
• 11
1 vote
33 views

### Can anyone suggest an Economical way for Polishing wound Wires?

I am working as a mechanical design engineer. At my work place, we were making chairs with 12 mm diameter wire via bending. We were using mild steel flash wires which was like the perfect wire with ...
• 11
1 vote
137 views

### Stepper motor response under varying load

I had a thought that came to mind that made me curious-- Though unfortunately I am not an ME. I was wondering if someone could assist me in working through my thinking, but you will have to be gentle ...
• 13
1 vote
183 views

### How to align a shaft with gear box and mechanical seal and uc bearing?

I have a 15 inch (381 mm) shaft with 24.95 mm diameter. That shaft is attached with a gearbox (ratio 5:1). The gearbox is driven by a motor (rpm 2750). There is one UC bearing and mechanical seal and ...
1 vote
74 views

### Compound Machine with Worm and Worm Wheel Drive Velocity Ratio

I'm having trouble understanding the working principle behind solving this worm drive. Here's the question: A double threaded worm and 40-tooth worm wheel are used to drive a mechanical winch. The ...
• 115
1 vote
126 views

### Design a Jig and Fixture for 3-axis CNC Milling Machine

Newbie Here!!! This is my assignment task. I am required to design a Jig and Fixture for 3-axis CNC Milling Machine. The workpiece will be a simple aluminium block and it will be cut and shaped into a ...
1 vote
117 views

### Specifications of Tensile Test Specimen?

I am Currently Working on Measuring Various Mechanical Properties of Metalic Materials using Universal Testing Machine (UTM) at Various Temperatures. I know that for Testing at Ambient Conditions, ...
1 vote
90 views

### How can you convert 180 rotation into two separate motions?

I have a small servo that can rotate 180 degrees. I would like to get two different connected parts to move at different times, one part moving while the servo is between 0-90 degrees, the other part ...
• 119
1 vote
161 views

### RSS Tolerance calculation and usage

From my experience, I've been calculating RSS tolerances by squaring all relevant tolerances, summing them up and then square rooting the sums... ie: RSS=[Σ(tol^2)]^0.5 I've also heard of other ...
• 21
1 vote
355 views

### Tolerance Analysis on clearance holes

I am designing an enclosure that holds a lens (clearance fit) and a photodiode on a PCB. The alignment of the photodiode to the lens must be pretty tight, thus I am using a boss on the enclosure (also ...
• 21
1 vote
387 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 ...
• 11
1 vote
693 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 ...
1 vote
690 views

### Pivoting trailer gate on multiple axes

I am currently trying to design a rear gate to retrofit to an existing caged trailer (similar to image 3), with the goal of having a system where the rear gate can pivot down (on its bottom edge) to ...
1 vote
328 views

### How do I calculate the force coming from the centrifugal compressor exhaust?

Let's say I have a centrifugal compressor as shown in the figure and I know the following parameters----1 Thrust Inlet and outlet pressure Power required to operate the compressor Inlet and outlet ...
• 121
1 vote
196 views

### Reacting Propeller Torque?

A motor is used to drive a shaft that is geared through 1:1 bevel gears to a propeller. The shafts are mounted on bearings in a hard casing that is attached to a 2nd ground. I want to know if the 2nd ...
1 vote
157 views

### Why would anyone "pull the stem out and stop the wristwatch at night or when not wearing it" in the context of mechanical watches?

I read this the other day while discussing mechanical pocket and wrist watches: Plus it is common practice to pull the stem out and stop the wristwatch at night or when not wearing it. You then have ...
• 11
23 views

### Calculation and selection of shafts and gears

This is a solar tracker The top weight is about 6 kg What is the minimum torque required to rotate the upper part? What shaft is needed? And the diameter of the gear?
8 views

### How.can I variably adjust the rpm of one of three rotating shaft to make it .ove faster or slower, but the other two shafts move at same rpm?

I'm making a machine with two feed rollers that are linked together and chain driven and a third shaft with a cutter on it. There will be two sets of these three one on top of the other to make both ...
17 views

### What is a good approach to create a powder dispensing system for a home project?

I have this task where I need to dispense a certain amount of powder (small quantities, around 10g or so), onto trays that are stacked on top of each other with a space of about 20cm between each tray ...
29 views

### Turntable for tanks

I am working on a project for an assemblable turntable that is meant to incur heavy weights. Would it be possible to transfer the tank's momentum into torque for a turntable or use the tank's weight ...
41 views

### Motor torque required to move a trolley

This is a real situation. The trolley is mounted with a rack underneath it and multiple steel wheels on a steel track. The trolley is driven by the rack and pinion mechanism from a geared motor. The ...
• 1
21 views

### eccentric to linear

How does one translate the up and down distance moved in degrees when rotating around an eccentric bearing eg 10 degrees will get me X in a linear value
18 views

### Method to calculate required gear size and teeth size for a rack system for a certain amount of travel?

high school amateur engineer- and first-time poster- here. I'm making a Nerf automatic springer system, and I want to model it. However, I don't know what size rack and gear system I need. I need 60 ...
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 ...
41 views

### Free body diagram problem: Linkage w/ magnets and friction hinge

I am a bit stumped on a IRL problem, which i simplified in the diagram below: There are left and right beams (gray) linked together by a friction hinge. The bottom beam (black) is connected to the ...
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90 views

### Understanding moment load on axis (for robotic arm)

Check Pete comment for explanation below :) thank you Pete! I need help understanding a concept im struggling with for quite a while now. Im looking at different type of robotic arm designs, and some ...
47 views

### Spring compression and quick release mechanism

I'm in a group and we're designing a wheel that can inflate and decompress using springs. The purpose of the string compression/decompression is to give our tires this jumpy/bouncy like movement. ...
14 views

### I need a good description of a flow control valve for a tankless gas geysers. Preferably the battery type

I need to understand the working of the flow control valve of a battery operated tankless gas water heater. It's the two or three knob geyser that uses 2 x D-cell batteries for ignition. But I ...
53 views

### What is the difference between 7201 vs 7201 BEP Single Row Angular Contact Ball Bearings?

What does BEP mean when applied to types of ball bearings?
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62 views

### What strapping mechanism is this?

What should I google to find the strap from the picture? It looks like a screw is used to tension the strap, which is exactly what I need. I've already spent some time trying to find a manufacturer ...
82 views

### Force Required To Stop A Freely Rotating Wheel With Attached Falling Object With A Spring

I have a wheel with a diameter of 2m and a weight of 67kg. The wheel has a radius of gyration of 0.82m. From this wheel a weight of 35kg is suspended. The weight will fall for 10m and accelerate the ...
38 views

### How to attach plates (my design) to the stator core of the machine more efficiently and precisely?

I am working on an electrical engineering project. However, I have come across a specific mechanical engineering problem. I have attached an image to describe what I want to do. I have primarily a ...
46 views

### Kindly explain this graph which is related to internal combustion engines

Hello, I am not getting this graph which is related to the Internal Combustion Engine.
36 views

### New to AutoCAD, trying to accomplish a simple task of trying to simulate how much force can a U channel withstand

Sorry if my question or parts of it seem vague or stupid, I'm fairly new to mechanical engineering. I'm part of a team that is building a simulator platform and I am mostly at the helm of the software ...
18 views

### Motor for a sukkah rooflight

im designing a motor for a roof light but will need to be disengaged from the motor and be able to open and close without any electricity. any ideas would be greatly appreciated
94 views

### How to determine whether a threaded rod will rotate under load

A part of a structure I am designing incorporates a large threaded rod (1") diameter mounted vertically both for structural strength and for the potential to adjust the height of the top mounted ...
44 views

### Frames and Statics Question

this is an image describing an exam question I have to practice on, and I am so stuck.
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78 views

### Building Equations of Motion

The following figures represent a model of a building, can someone help me, extract the newton equations of motion and determine the degrees of freedom.
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