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Many thanks in advance,

Alex T

- Thread starter Justtoots
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- #1

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Many thanks in advance,

Alex T

- #2

SteamKing

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This is the specification of the cable;

DIN 3055 2mm

Steel C7 ( Mn + Si) , hot-dip galvanized with 1770 N / mm nominal strength

SPECIFICATIONS:

Cable diameter 2.0 mm

Construction 6x7 + FC

Tensile strength of 1770 [N/mm2 ] [ Mpa ]

Weight / meter 0.0146 kg

Breaking load 260 kg

"Is a camera going to be hung from this chain? "

Yes, the idea is that I will build a carriage which will be remote controlled with a drive motor to run the length of the cable.

"What is the mass of the camera and its attachments? "

The total weight of the carriage plus camera is, 1.26Kg

"Does the sag criterion apply with or without the camera being suspended from the chain? "

The sag needs to be calculated with the camera applied to the cable. My aim is to know what tension need to be applied to the cable so that when then camera travels up and down the cable, it does not sag to much that it hits the ground.

- #4

A.T.

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Here is a calculator, but without extra load:

http://www.spaceagecontrol.com/calccabm.htm

http://www.spaceagecontrol.com/calccabm.htm

- #5

SteamKing

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http://www.tramway.net/Advanced Equations.pdf

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Hi SteamKing,

http://www.tramway.net/Advanced Equations.pdf

I hope justtoots was able to work out his calculation.

I found myself using the cable tramway equations for a simple suspension bridge I want to build in my backyard. I had to convert my Aussie metric to Imperial to use the stress curve tables on page 156 & 157. Are you aware of an online calculator that I could use in place of the tables? Also, when calculating (T), am I correct in assuming that is the cable tension and would thus be the equivalent tension at each of the anchors??? I was also wondering if (T) was measured in pounds force?

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SteamKing

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No, I'm not familiar with any such online calculators.Hi SteamKing,

I hope justtoots was able to work out his calculation.

I found myself using the cable tramway equations for a simple suspension bridge I want to build in my backyard. I had to convert my Aussie metric to Imperial to use the stress curve tables on page 156 & 157. Are you aware of an online calculator that I could use in place of the tables?

I would not advise using these equations to design a suspension bridge. These equations are intended for use in analyzing tramways, i.e., vehicles suspended from a cable, and are not necessarily applicable to designing suspension bridges.Also, when calculating (T), am I correct in assuming that is the cable tension and would thus be the equivalent tension at each of the anchors??? I was also wondering if (T) was measured in pounds force?

IIRC, justtoots was trying to suspend a camera from a long cable and limit the sag in the span due to the weight of the camera. If he miscalculated, he was out the price of a new camera.

In your case, you want to build a suspension bridge to be used by people, so if you miscalculate, someone could get hurt.

In this circumstance, I urge you to seek the advice of a qualified engineer who can inspect your site and discuss with you what sort of bridge you plan to build. There may be local building codes which also must be satisfied, and the engineer you select should be familiar with these codes. The engineer can design the structure you need and help in the selection of the proper materials and methods of construction.

Good Luck!

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