4 replies to this topic

[Intven]

Hello,

I am a student from a dutch university and i am trying to design a cable way, with 2 cables 1000m lenghts, but i have some questions,

first, i wanna use a hydraulic cable tensioning system, but i have no clue how it works, or how to calculate how much tention i need on the cable? ive read some stuff on the site and it helped me understanding it a bit better, but no calculations.

second, i wanna use 1 engine for both cables, how can i make best give the power from the engine to the two wheels that drive the cables? Now there is a differentieel that divides the power, but that is expensive and very heavy, there must be a better option.

third, why do you use solid masts and not "fachwerke" dont know the english name....because they catch less wind, are are probably cheaper to build?

thanx,

Tijs Intven

[Vincen]

Intven, on Mar 2 2006, 01:48 PM, said:

second, i wanna use 1 engine for both cables, how can i make best give the power from the engine to the two wheels that drive the cables? Now there is a differentieel that divides the power, but that is expensive and very heavy, there must be a better option.

You can use technology with one cable such what we call DMC in french, it's a transport where cabins are on a line with two cables such as explained in that thread, the cable pass two times at each end so you use only one engine and no risk of delays between the two cables as it's the same ;)

Hope it helps

Vincèn

[liftmech]

Tijs, welcome to the western side of the Atlantic. I hope you can find some more information via our 'search' function; we're not exactly an engineering site but there are random threads that do contain some of the information you're looking for. I can answer one of your questions off the bat, though- yes, we use tubular steel mast for our towers because they are much cheaper to manufacture. When your mast reaches a greater height, though, you'll generally see a 'latticework' section at the bottom because it is more rigid than the tube construction.
I would think you wouldn't want a differential in your drive system because it would shift all power to only one of the drive sheaves, while the other would 'follow' it and not provide any power to the rope.
Here are a few threads to check out:
http://www.skilifts.org/nwsforum/index.php...=893&hl=funitel
Yan's QMC, only one of which was ever built:
http://www.skilifts.org/nwsforum/index.php...wtopic=1084&hl=

[nathanvg]

Intven, on Mar 2 2006, 06:48 AM, said:

Hello,

I am a student from a dutch university and i am trying to design a cable way, with 2 cables 1000m lenghts, but i have some questions,

first, i wanna use a hydraulic cable tensioning system, but i have no clue how it works, or how to calculate how much tention i need on the cable? ive read some stuff on the site and it helped me understanding it a bit better, but no calculations.

second, i wanna use 1 engine for both cables, how can i make best give the power from the engine to the two wheels that drive the cables? Now there is a differentieel that divides the power, but that is expensive and very heavy, there must be a better option.

third, why do you use solid masts and not "fachwerke" dont know the english name....because they catch less wind, are are probably cheaper to build?

thanx,

Tijs Intven

Issue 1:
Cable tension calculations will be complex. Key factors will be distances between lift poles, weight of carriers with load, kinetic friction on cable, and static friction on cable. Maybe someone has a rule of thumb.

Issue 2: I don't know how this is done in practice, but why not use two equally sized wheels then redirect the cable to fit the path of the lift when under load? (by using sheaves ect) This would ensure equall speed of the two cables assuming negligent slippage.

Issue 3:
I'm thinking that "fachewerke" are actually more expensive due to the greater number of parts and thus greater number of connections.

[Intven]

Thanx for the help, anyone else got more tips?