# Recent content by Herbid

1. ### Tension in a Rope from Lowering Down and Friction Braking Torque at Stop

Well, I think the force tension is 150 N. F = Fbrk - Fmass F = 150 N - 100 N F = 50 N Then F total is, Ftot = F + Fmass Ftot = 50 + 100 Ftot = 150 N. ======== But I wonder if the speed much slower, 0.1 m/s and if the speed higher 10 m/s, by the equation above the tension of rope at braking is...
2. ### Tension in a Rope from Lowering Down and Friction Braking Torque at Stop

(The weight scale = 10 kg). After initial force, now the mass is lowering down at constant speed of 1 m/s. The motor with pulley's radius of 1 meter is exerted 100 Newton m to keep constant V. The motor speed is about 9.55 rpm. * All other weights, inertia and frictions of the system is...
3. ### Luffing Jib Load, With and Without Sheave Pulley

It is indeed in C, the tension of red Rope is bigger the in D, because the load in C is double pulled by load and ground. CMIIW
4. ### Luffing Jib Load, With and Without Sheave Pulley

Now I am working with a DIY Luffing Jib Crane. Mys subcon said that: Tension of red rope for hanging a blue box load at the tip of the boom i(A) s as the same as hanging it with pulley and tied to the motor/ground_B (System in a Static Load Condition).. Blue Rope and Pulley weights are...
5. ### Problem With a Slewing Bearing Crane

My calculation for B. I assume an extreme condition that the center of gravity is right bellow 1 ton anvil (for easier cal). So I draw straight line as a lever from fulcrum to the that center. Skiip. The total moment Inertia is: Inertia of 1 Ton anvil plus (100N x cos a) x length of red...
6. ### Problem With a Slewing Bearing Crane

I am about to start, but stuck when a center of gravity (mass?) is involved.
7. ### Problem With a Slewing Bearing Crane

I see. I think B will create much bigger tension in T since its center gravity position is farther away (result as a moment?) from fulcrum than A.
8. ### Problem With a Slewing Bearing Crane

Understand. Blue box is welded to black base, or blue and black is a one single unit device. Now if there is a 100N horizontal force acting to blue box in top left side like pic attach: Is Tension of Red Rope (T) the same for A and B condition?
9. ### Problem With a Slewing Bearing Crane

Ok case closed. I just wonder from this picture: Is Tension in rope T, the same for hanging an anvil at Bottom Right (A), or if we put it on Top Right? (B). The hinge or fulcrum slightly off center to the left side. Because now we have weight of big blue box. is the center of gravity taking...
10. ### Problem With a Slewing Bearing Crane

So if the vertical mast is higher than 100cm, let say as extreme as 1000cm (the weight is neglected), it is still no radial forces acting to the right side of the hinge?
11. ### Problem With a Slewing Bearing Crane

But a radial force is bigger than if the scale of left right load is a horizontal straight and same length of line.
12. ### Problem With a Slewing Bearing Crane

Dear All Masters I have problem with slewing bearing crane. My subcon made a crane that have a very high platform deck form slewing bearing. They said it is fine and the height is not an issue as it is in lower place. I know the higher the load from slewing bearing, the bigger the force or...
13. ### Calculate Force Compression of Crane with Hoisting Slink

Actually it is a simple one, but the point of view of the force acting in pic attach of some people are different. http://www.imagebam.com/image/ef24231032403754 http://www.imagebam.com/image/01c8e71032403724 The adding weight of hoisting slink blue and the pulley is neglected. I think the...