# Questions tagged [force-measurement]

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1 vote
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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 ...
• 11
13 views

### What is the correct equation for McKibben force output calculation?

I found this post, but no matter how many times I try, either in radians or in degrees, the results are simply weird. My "correctest" result was -179533. The dimensions are 100mm of length, ...
• 51
36 views

### Converting values from Tensile Strength tester to newtons

I have a Tensile Strength tester from TMI model 84-76. I am getting data from this machine over the serial port. I don't understand what the values are that it is streaming during the test. I do know ...
• 101
1 vote
47 views

### Counter-intuitive behavior of chain drive

In a chain drive system, sprocket 2 has a motor attached, sprocket 1 is being driven. The blue construction is static and immobile. Before starting the motor, both load cells show 0 (tare). ...
55 views

### Is it possible to simulate inertial load using brake?

Suppose to have an engine attached to a flywheel, I add power, the flywheel start to rotate and oppose a resistance to motion. More power, more resistance. I'm wondering if I can simulate this ...
1 vote
69 views

### Forces on a catenary cable span

This relates to an unusual action on a catenary cable span and is not covered by the many available calculators or standard formulas. I'll add a diagram 'tomorrow' if attention warrants. (0400 now - ...
• 3,874
195 views

### How do I relate tongue weight to weight x distance?

The specification for car hitches routinely state the tongue weight, but do not specify how far that weight can/should be applied. What am I missing? Shouldn't the maximum bending moment be the one to ...
• 441
1 vote
93 views

### Benefits of a steel ball in janka hardness test

The Janka hardness test is a test used to measure wood's resistance to denting. The test involves pressing a steel ball that is 0.444" in diameter halfway into a piece of wood and measuring the ...
• 317
63 views

### What would be the Force Balance on this situation:

I'm struggling to find the correct Force balance in the following situation: The black parts are hard stopers. The blue part is moving perfectly aligned with the Y-axis in the negative direction. The ...
43 views

### Practical question on force in a molding application

I have a molding machine that is holding a spring loaded mold closed. The mold is basically two blocks of steel, but one half has a slide system that is pushed open by a number of gas springs. Those ...
44 views

### Truss beam like structure strength per height

The second beam is 2x the height of the first one. Is 1 stronger then 2 to bending force (arrow shows direction, supported on the sides)? If it does, I'm trying to figure out why, because they both ...
• 115
100 views

I am looking to measure the force applied (in this case by a foot to a pedal). I have a working prototype that allows up to 450N of force, but wish to double this. The load cell I have been using is ...
235 views

### How does a single point load cell eliminate the inluence of moment/load placement

All descriptions I have been able to find mention some variation of "due to their geometrical design single point load cells are immune to load placement" with no explanation on how is it ...
1 vote
130 views

### Lifting Analysis of a 3D cuboid

I have a cuboid of weight W and the Center of Gravity at G. It is being lifted using 4 inextensible strings from the 4 corners: $C_1$, $C_2$, $C_3$ and $C_4$. The figure is something like this: The ...
56 views

### How to calculate and of measure the applied force between a motor and a flywheel

I am making a model for a flywheel. For this model, I found a way to calculate the torque and thus eventually the velocity of the flywheel. The flywheel itself will be floating due to magnetic ...
38 views

### What kind of pressure / strain gauge is this?

This is a photo of the backside of a diaphragm strain measurement element. I'm researching strain gauge operating principles, and the one shown below is eluding me. This is not a resistive strain ...
• 103
72 views

### Force required for a power generator in a coal power station

I am unsure about how to word this question properly and I assume that it might take two directions probably because of the unknown variables involved but here goes... On the actual physical power ...
• 101
1 vote
86 views

### Problem of lifting of a body using 4 strings

I have a solid object that has been lifted to a hieght by 4 strings. I know the lifting point and the 4 corners of the object. Also the mass and the center of the gravity location of the object is ...
1 vote
4k views

### Calculating torque in planetary gearbox

It's my understanding that in a planetary gearbox, force moves through the system via four mechanisms: the ring gear, the planet gears, the planetary carrier, and the sun gear. I'm trying to ...
2k views

### Spring and damper in series, equation of motion

For the motion in fig 4.1 (a), please check the description of this system in the images above, everything should be there. I get it, assuming the positive direction is downward, the spring tension is ...
• 1
68 views

### Will the torque applied to a circular object be the same if the object isn't aligned in the center of the Torque?

I'm a student designing a system to automatically turn a steering wheel. In this design the motor will be in the center of the steering wheel and it will apply it's torque on the steering wheel ...
65 views

### Calculating the maximum lifting force of an average car

I'm interested to know how much kilograms force an average car can produce. I made the following calculations to answer my question but I'm not sure if I'm right or wrong! Imagine we have a 1.8L ...
1 vote
74 views

### Force from screw on the clamp

I want to find out the force the screw (M5 , 12mm long) exerts on the clamp so it can hold the cylinder as shown in the image. I want to know whether the clamp can displace enough to hold the cylider ...
151 views

### Vector homework problem [closed]

This is a question from Engineering Mechanics by Shames. I am unable to resolve this as the question mentioned.
249 views

### Inertial Force expression in spring

Let there be a spring as shown. And this is stretched to point C and released, then force exerted by spring on mass in region X2 is "- kx" . But This springs gains kinetic energy at mean ...
• 11
1 vote