Questions tagged [mechanical]
The mechanical tag has no usage guidance.
85
questions with no upvoted or accepted answers
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answer
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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 ...
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4
votes
0
answers
263
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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 ...
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2
votes
0
answers
43
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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-...
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2
votes
0
answers
35
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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 ...
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2
votes
1
answer
508
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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.
2
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0
answers
45
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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
1
answer
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 ...
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1
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0
answers
33
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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 ...
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0
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31
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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 ...
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0
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36
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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
1
answer
155
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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 ...
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0
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33
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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 ...
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1
vote
1
answer
137
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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 ...
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1
vote
2
answers
183
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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 ...
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0
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74
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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 ...
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1
vote
0
answers
126
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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 ...
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1
vote
1
answer
117
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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, ...
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0
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90
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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 ...
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1
vote
0
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161
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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 ...
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1
vote
0
answers
355
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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 ...
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1
vote
0
answers
387
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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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1
vote
0
answers
693
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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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1
vote
3
answers
690
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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 ...
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1
vote
1
answer
328
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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 ...
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1
vote
2
answers
196
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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 ...
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1
vote
1
answer
157
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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 ...
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votes
0
answers
23
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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?
0
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0
answers
8
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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 ...
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0
answers
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 ...
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0
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0
answers
29
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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 ...
0
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1
answer
41
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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 ...
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0
votes
1
answer
21
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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
0
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0
answers
18
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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 ...
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0
answers
18
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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 ...
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0
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0
answers
41
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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
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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 ...
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0
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0
answers
47
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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. ...
0
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0
answers
14
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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 ...
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0
answers
53
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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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2
answers
62
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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 ...
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0
votes
1
answer
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 ...
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0
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0
answers
38
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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 ...
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46
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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.
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0
answers
36
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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 ...
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18
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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
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0
answers
94
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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 ...
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0
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44
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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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0
answers
78
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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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23
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FEA of Rectangular Body Under the Effects of Combined Rotational and Translational Shear
First image is model setup. Clasp is rigidly constrained at top surface. Rectangular beam is affixed to clasp at clasp faces (locally constrained), by way of adhesive pads (second and third images).
...
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0
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0
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23
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Question about dynamics n-t coordinate system
et = tangential unit vector
en = unit vector in normal direction
I'm currently studying dynamics and I'm having difficulty understanding the process of obtaining det and det/dt in the n-t coordinate ...
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