Questions tagged [mechanical]

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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 ...
CKK33's user avatar
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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
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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
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2 answers
27 views

How do rotate a picture on a wall once every 24 hours?

I have a picture with various day and night scenes that I would like to hang on a wall and have automatically and uniformly rotated once every 24 hours. The picture is roughly 55cm in diameter, 2cm ...
Slarty's user avatar
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2 answers
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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 ...
slm992's user avatar
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1 answer
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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
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2 answers
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I want to cover a circular area with a sheet that is rolled onto a curved metal rod

My challenge is that the sheet gets bent in places around the rod making extension challenging. Another challenge is that since the metal rod is curved it turns in an awkward way that I want to ...
Harsha Kumar's user avatar
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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
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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.
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
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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
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2 answers
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Wind Turbines on Cars used for Aerodynamic Braking

After a lot of research, I have found that people have been continually claiming that Wind turbines on Cars would not help whatsoever due to the Law of conservation of Energy. While this statement is ...
Ruthvik Venkatesan's user avatar
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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
william's user avatar
1 vote
2 answers
76 views

Mechanical linkage

I am not an mechanical engineer and I have a question about this laboratory rocker (https://www.thingiverse.com/thing:2948680/files). As I wish to reduce the height of the Model_Base.stl by half, by ...
alirazi's user avatar
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1 answer
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Characteristics of a smooth belt

I want to replace a cylindrical pulley, so I came across a component called a smooth belt. Now this thing came with many differenent variations, from 2.00" up ...
user1584421's user avatar
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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
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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
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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.
Rayleigh's user avatar
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2 answers
65 views

Why do some car's A-engine-mounts have bolts vs studs vs both?

I have come across engine mounts of various cars and am just curious primarily related to the "A" engine mounts where some manufacturers use only BOLTS, while some use only STUDS and some ...
Akay's user avatar
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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
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0 answers
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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). ...
C_Nyuli's user avatar
0 votes
2 answers
153 views

gear size selection for a compound gear system to fulfill a specific output ratio

I need help creating a compound gear system that will result in the sought after drive ratio or very close to it. Naturally gear teeth need to be whole numbers. Websites like 'GearGenerator' (dot-com) ...
Inventor Moe's user avatar
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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
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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
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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
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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
1 vote
1 answer
85 views

Acceleration of servo motor with AASD-30A

I am using a servo motor 130st-M15015LB with the AASD-30A driver. I have to use the acceleration with position control mode. I can see in the documentation that If I use Pn110 to Pn112, I can have a ...
Leonardo Rafael Mora'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
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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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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
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1 answer
207 views

What will the reaction forces of a support be in case of an angled cable

If a cable is attached to a support on each side, and there is a load acting on it somewhere along its length. Is there going to be a vertical reaction force only if the the cable is angled?
kokos115's user avatar
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1 answer
90 views

The knee gives a mechanical advantage point for the leg, would a "reverse knee lever" also work?

As shown in this video, the simulated knee cap creates a fulcrum that allows for a better mechanical advantage for the muscles to pull the leg. So I was wondering if the reverse would also work, or if ...
Fulano's user avatar
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-1 votes
1 answer
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How to keep a stationary motorcycle handle in the forward direction

How to keep a stationary motorcycle handle in the forward direction if no force is applied to rotate it. I have seen such motorcycles in Arcade Game Parlours but I want to make such one for myself.
Manjinder'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
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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
2 votes
1 answer
167 views

Torx, Hex, Philips or Slotted screws

I mostly use M2.5 size screws. I got some brand new Torx screws but when I tightened them for the first time, either they stripped or the bit of the screwdriver got twisted. What could be the reasons? ...
lovedrinking's user avatar
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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
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0 answers
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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 answers
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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
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
0 votes
1 answer
69 views

Scissor mechanism won't budge with slotted pin

I am looking to better understand why this scissor mechanism so easily moves by directly pulling on the lift...yet, seems incredibly difficult/impossible to move via the attached point in the slot? ...
afreeland's user avatar
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3 votes
1 answer
232 views

How does this pawl mechanism work?

From 507 mechanical movements, No. 63, we get the following diagram and description. Jumping or intermittent rotary motion, used for meters and revolution-counters. The drop and attached pawl, ...
Sam Gallagher's user avatar
0 votes
1 answer
43 views

how to fix an object at either 90degree or 0 degree

my problem is i donot know how to let the blue colored object be fixed at either 0 or 90 degree. i dnot want to be moveable at any degree like 30, 40 , or 50 degree either 0 or 90 degree. i have tried ...
ABO M7TRAF's user avatar
-1 votes
2 answers
192 views

Wind-up toy car constant speed problem

Set Up: In a classic wind-up car we store energy in spring. The energy then used unequaly in time resulting variable speed during the ride. Max torque and power and acceleration at the begining, with ...
Yury Komarinskiy's user avatar
0 votes
2 answers
62 views

Strain As A Function of Deflection of a Hollow Cylinder

I should think that there would be a direct correlation of strain to deflection of a hollow thin-walled cylinder, but I've seen nothing as of yet. I must be missing something. For example, let's say I ...
Chris's user avatar
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1 answer
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What is this spring known as?

Could anyone tell me what the spring part of this component is called please so I can source something similar?
Pyy's user avatar
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0 answers
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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
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-1 votes
1 answer
57 views

how to let a needle move in positv roation and then a negativ rotaiton then it should loops [duplicate]

i am trying to make a watch that looks like the speedometer from merceds benz AMG my problem is i canot figure out how to let the needle or the minute hand (call it what ever you want) rotate from 0 ...
ABO M7TRAF's user avatar
-1 votes
1 answer
143 views

How can I make a needle to turn slowly CW to the final position, then return quickly CCW back to the initial position and to start again turning CW?

What I want is after the needle reaches 60 it should go back to 0 in the way showed in the image The mechanism should preferably be based on gears which convert a steady continuous rotation to the ...
ABO M7TRAF's user avatar
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

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