Recent content by Ghrober

ok Stephen I think I got it now. I need to convert the degrees into radians. Thanks a lot for your help and patience. I will need to go away and study trig to really understand the relationships. The end figure of 1.18T (11607Newtons/1000/9.81) was a lot less than I expected. Dragoneyes The...

:biggrin::biggrin::biggrin: I think I've got it. After much studying Stephens formula I have come up with 2.4189T/cable with the ramp @110 Degrees from vertical. W=weight of Door (N)(ton*9.81) 19767.15 L=distance to mass centre of flap(m) 2.6 A=height of cable top from hinge(m) 2.7...

I told a little fib the ramp is not completely uniform but it is 3.3m long. I used the figure of 2.6M as a bit of a guess. To give you the background, this ramp already has been built and is working on a vessel. It is fitted with 2 x11mm SWR with a WLL 2.3t (min breaking force/5(safety...

hi all further to my initial post I have done a calculation using the ramp lowered at a angle of 110 degrees from the vertical using Stephen's formula and the ramp dimensions I supplied and have come up with an answer of 61.101Kn is this correct? if so is this a combined force required over the...

Thanks for your comments. I understand what your saying. I was hoping to use the information to confirm that the WLL of the cables are sufficient to raise the door. The winches are also fitted with torque limiters(clutches) that are designed to stop over tensioning of the cables, but still alow...

Thanks Stephen for all your work. Chronos, The ramp is on a boat the cables are raised and lowered by electric motors to allow cargo to be driven on and off the vessel. When the ramp is closed to provides a weather proof door.

here is a picture not great but you should get the gist

I'll try to send a picture shortly, But you got most of it. The pulley is 2.7m vertical from the hinge, the cables are never vertical. They form an angle of approx 45 degrees when the ramp is horizontal . The ramp can be lowered approx to 120 degrees from the vertical. I would like to know the...

Hi all, This is not a homework question it is trying to get brownie points from my boss. I have a ramp (mass 2015kg of uniform size) hinged at one end lowered by cables (2) through a sheave 2.7m Vertical. The anchor point on the ramp is 2.7m from the hinge. The overall length of the ramp is...