Questions tagged [mechanical]

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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 ...
PSz's user avatar
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4 votes
0 answers
241 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 ...
Berkcem's user avatar
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2 votes
0 answers
39 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-...
dardeshna's user avatar
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2 votes
0 answers
32 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 ...
Amitabh Roy's user avatar
2 votes
1 answer
399 views

How to calculate torque requirement for vehicle with Mecanum wheels?

What are the changes specific to mecanum wheels when calculating torque requirements for a vehicle. I have the data for the vehicles mass, top speed and top acceleration.
manuj kushwaha's user avatar
2 votes
0 answers
42 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 ...
Lance's user avatar
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1 vote
1 answer
32 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 ...
CKK33's user avatar
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1 vote
0 answers
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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 ...
AKKK24X7's user avatar
1 vote
2 answers
129 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 ...
Sazed Karim's user avatar
1 vote
0 answers
69 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 ...
Swiss Gnome's user avatar
1 vote
0 answers
120 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 ...
JUZ Aviewer's user avatar
1 vote
1 answer
113 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, ...
user464141's user avatar
1 vote
0 answers
83 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 ...
Dr. Cyanide's user avatar
1 vote
0 answers
126 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 ...
Philip C's user avatar
1 vote
0 answers
309 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 ...
Philip C's user avatar
1 vote
0 answers
330 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 ...
Praneeth's user avatar
1 vote
0 answers
533 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 ...
kerob_labs's user avatar
1 vote
3 answers
628 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 ...
toxicantidote's user avatar
1 vote
1 answer
307 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 ...
sai teja's user avatar
  • 121
1 vote
1 answer
983 views

Calculating max weight capacity of brushless motor

I am having trouble determining the maximum weight capacity a motor can handle. I provided the specs below. The calculations are for the top row or the 580KV model. So to start off,I'm only taking ...
user avatar
1 vote
2 answers
185 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 ...
Craig Denham's user avatar
1 vote
1 answer
123 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 ...
Kaz's user avatar
  • 11
0 votes
0 answers
34 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?
lovedrinking's user avatar
0 votes
2 answers
48 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 ...
slm992's user avatar
  • 1
0 votes
1 answer
49 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 ...
Mecky's user avatar
  • 1
0 votes
0 answers
35 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 ...
Hassan's user avatar
  • 1
0 votes
0 answers
43 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.
ABDUL SABOOR KHAN's user avatar
0 votes
3 answers
86 views

Need help analyzing torque transfer and slippage condition between parts

I have a scenario where Plate A (light blue) shown in the image below is being pressed against two different plates that are in contact with different sections of Plate A. I would like to know which ...
SoloLeveling's user avatar
0 votes
0 answers
33 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 ...
Zeshan Noori's user avatar
0 votes
0 answers
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
william's user avatar
0 votes
0 answers
59 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 ...
Nachiket Adhvaryu's user avatar
0 votes
0 answers
39 views

Frames and Statics Question

this is an image describing an exam question I have to practice on, and I am so stuck.
Luca's user avatar
  • 1
0 votes
0 answers
73 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.
Rayleigh's user avatar
0 votes
0 answers
20 views

Which pilot hole is better for helicoil insertion, a hole with cylindrically flat surface or a hole with cylindrically tapered surface

When it comes to helicoil insertion, the choice between a hole with a cylindrically flat surface and a hole with a cylindrically tapered surface depends on several factors. These factors include the ...
Shryas's user avatar
  • 1
0 votes
0 answers
22 views

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). ...
C_Nyuli's user avatar
0 votes
0 answers
21 views

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 ...
RMDL's user avatar
  • 1
0 votes
0 answers
28 views

High or low friction on a sprocket/chainbelt drive

We have a segmented belt/chain drive. Both the belt/chain and sprocket are nylon and we have issues with slipping on the sprocket. Would a material change help or do we just need a better tension ...
Minnesofa's user avatar
0 votes
0 answers
13 views

Coupling suggestions required

I am looking for a Hub-Shaft coupling which has no alignment error (angular as well as parallel) and can be used for a fixed axial distance. No misalignments can be ensured by PL032X050M but in order ...
Ishan's user avatar
  • 1
0 votes
0 answers
159 views

Inertia calculations of planetary gear given below?

We are basically working on rotary pick and place mechanism based on working of gear mechanism with some modifications. Check the picture There are three planet gears which are attached to a carrier ...
The Top 10s's user avatar
0 votes
1 answer
57 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 ...
Nevermnd's user avatar
0 votes
0 answers
159 views

What is the purpose of the additional metal bar on the latch bolt(tongue)of the door lock?

Hi. As you may see at the photo,the tubular latch has a triangular metal and a thin half cylindrical piece of metal next to it. The purpose of the triangular one is obvious,but What is the purpose of ...
xchcui's user avatar
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0 votes
0 answers
77 views

2-speed 2-direction gearbox design

I need to design a gearbox with the following properties: The direction of rotation is maintained between the input and output shaft The input shaft can be rotated in one direction for one gear ratio ...
Rob's user avatar
  • 1
0 votes
0 answers
22 views

Which tool to measure shaft alignment for small diameter shafts (d=10mm)?

I have seen many tools and methods to check shaft alignment, but they are mostly used for big shaft. I wonder if there are small tools for small diameter shaft with limited space to install? Can you ...
Random engineer's user avatar
0 votes
0 answers
45 views

How to affix a 3/4" keyed bore wheel/pulley to 5/8" D-profile shaft?

How do I affix a 1.5-inch-thick wheel with a 0.75-inch keyed bore (or pulley) to my motor's 1.25-inch-long x 5/8" diameter D-profile shaft (both pictured)"?
JJ Zabkar's user avatar
  • 101
0 votes
0 answers
39 views

DC Motor - need to go to 200-10,000 RPM

I'm currently working on a setup with Raspberry Pi, a 12 V DC motor and a L298N driver. I need the motor to go from 12000 RPM to 200 RPM, or at least in that range - the only problem is that the L298N ...
Rhythm's user avatar
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0 votes
0 answers
20 views

hydraulic pressure per cylinder, see below

when providing 2800 psi pressure to 6 hydraulic cylinders with .196 area of each cylinder what is clamping force on each cylinder. F=Pressure *area so 2800 x .196 is 548.8 psi or is it 548.8 /6 = 91,...
dag7649's user avatar
0 votes
0 answers
26 views

How to pull a component through a panel cutout using a screw mechanism?

I have a camera fixed to a cube frame structure made from aluminium extrusion. The frame will be covered by a 3 mm thick fibreglass enclosure (this is highly rigid) with a cutout for the camera, which ...
Pyy's user avatar
  • 103
0 votes
0 answers
124 views

Calculation on gearbox design

I want to design a gearbox of 70hp input motor and speed of 1400rpm. The gearbox ratio is 1:10 of 2 stage parallel arrangements. How do I calculate for the teeth, modules and other requirements ...
UTHMAN EEMMALION's user avatar
0 votes
0 answers
25 views

How does the retrofit mechanical system work in the rear brake pistons of cars (dual hydraulic + mechanical)?

I discovered recently (when changing the rear brake discs/pads of a car) that the piston cannot be pushed back without setting a rotation to it in the same time. This is due to the dual system with ...
user1556814's user avatar
0 votes
2 answers
816 views

How can I understand shear flow in a beam cross section?

I am trying to understand shear flow and I am just not getting it. For example, one of the problems in Beer has an I-beam and there is both a horizontal and vertical force acting on it. So it has ...
Karlton's user avatar
  • 21