Recent content by chessguy103

W is the pressure on the inside surface of the plate in psi, and q is the distributed load (lb/in) when looking at the problem from a 1D point of view, with 2 of the bolts acting as simple supports. The exact values don’t really matter. But let’s say I wanted to prescribe a certain deflection of...

Hi, Forgive me for the crowded drawing, but please reference the attached screenshot. Let’s say I have 2 plates bolted together by some bolts (red), and on the inside is a pressure w pushing the top plate up, in psi (lb/in^2). In order to get an estimate for the maximum distance between bolts...

Hi everyone, I’m trying to figure out the clamping force of a set of screws that thread into a plate. My question is: Would this calculation differ from calculating the clamping force of a bolt with a nut? What would be the difference in how the fasteners/members would react to a tensile...

Also, let’s say tension on the rope is 1000 N. If the total number of turns on the drum is 20, then the compressive force is 20000 N? I assume that would be applied as a uniform distributed load across the surface area of the drum, in addition to the 1000 point load tension?

I’m modeling my winch based on a winch that I bought and disassembled. It had a hollow drum, but inside the hollow drum was another hollow tube to allow for spinning. Inside the second hollow tube there was a bolt that went through the tube (and therefore the drum), and held everything together...

In the scenario I'm looking at, no it doesn't rotate. I'm trying to model a hand winch with a force applied through the rope, but with the brake activated so that no parts are moving.

Thank you. And once I find the deflection, what do I do with that value?

Hi all, I'm working on designing a device, and I'm having trouble with material selection for a shaft, modeled below. I have found the maximum stress due to bending on the shaft in question by using σ_max = (M_max*y)/I where σ is stress, M is bending moment, y is distance from the neutral...

You're saying that as long as long as it has the right power and rpm, then torque can be manipulated to be whatever I want, right? Just want to make sure I understood correctly. However, I'm trying to avoid complexity in the design and am hoping to just stick with direct drive from the motor...

I'm designing a 4-wheeled vehicle that will be driven by 2 servo motors (rear-wheel direct drive). The maximum torque required will be about 20 Nm (including a factor of safety). Since there will be two driving wheels, this amounts to 10 Nm per wheel. Is it bad to choose 2 motors with 15 Nm...

I see. I should account for that as well then. One other thing: let's assume a coefficient of static friction of μ_s = 0.72 (car tire on asphalt) That would mean that static friction force for all 4 wheels, F_s = N * μ_s = 50 * 9,81 * 0.72 = 353.16 N Which means that F_s for a single wheel...

Yes, that makes sense! Thank you! I'm ignoring wind resistance for now since it'll only go up to 20 mph (~9 m/s), and I also don't know the shape of the body yet. μ_r = 0.02 is what I found for rolling friction coefficient between a car tire and asphalt. And yes, I'm also adding mgsinθ*r for...

Hi everyone, I'm a mechanical engineering major, and I also like chess (as you can probably tell) It's good to be here :)

Hi everyone, I'm working on designing a vehicle that uses electric motors, but I'm having a little trouble finding the load and acceleration torques in order to select the right motors to use. Variables: m = total mass of vehicle a = acceleration μ_r = rolling friction coefficient r = wheel...