# Questions tagged [mechanical]

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1 vote
24 views

### How to estimate the rounding toque 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 ...
27 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
18 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
24 views

### How can I calculate the required motor torque to push a weight of approximately 15 kg?

I am working on a machine where I need to push a material weighing around 15 kg. The system consists of a motor and a ball screw mounted on the same axis, connected via a coupling. The ball screw has ...
1 vote
27 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
69 views

### Electronic enclosure - Long screw holes

am designing an electronic enclosure for a medical device. For assembly reasons, the enclosure is split into two halves, with the bottom half having a depth of 200mm and top half of depth 50mm. I want ...
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 ...
1 vote
34 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 ...
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 ...
39 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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70 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 ...
27 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 ...
1 vote
114 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 ...
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1 vote
32 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 ...
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49 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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31 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 ...
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58 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 ...
73 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 ...
98 views

### 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 ...
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 ...
45 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.
123 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 ...
35 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 ...
45 views

### 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 ...
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
1 vote
85 views

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 ...
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39 views

### 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 ...
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80 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 ...
43 views

### Frames and Statics Question

this is an image describing an exam question I have to practice on, and I am so stuck.
• 1
76 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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109 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 ...
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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). ...
209 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) ...
22 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 ...
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1 vote
103 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 ...
1 vote
105 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 ...
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290 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 ...
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91 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 ...
• 1
264 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?
103 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 ...
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43 views

### 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.
1 vote
169 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 ...
25 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 ...
303 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? ...
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52 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)"?
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54 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 ...
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,...
1 vote
73 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 ...
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