Hanging fixture from a log

[Crash_Override]

Has anybody any suggestions on how to do that? Logs are about 25-35cm in diameter. I need to hang one moving head (Robe Ledeash 600+) facing down from that log. Safety cable will be around the log.

[Dave m]

do you mean log?

Is it a question of language?

maybe tree trunk or branch?

It weighs just over 10.5 KG .

[Crash_Override]

Here is a picture. The fixture would be in the middle of the horizontal beam/log. It's temporary install for about 2 weeks.

[Bryson]

Something like this: https://www.thelightsource.com/products/chain-pole-clamp-175 - with the extension will do 14" or 35.5cm.   Might mark the log, though.

[TomHoward]

What I’ve done before for hanging projectors on rough beams was,

Bolt 2 half couplers to a 4-6ftish piece of timber eg 6”x2” using countersunk bolts or T-nuts or something to give a smooth back

Ratchet strap this to the underside of the beam with 2 or 3 endless straps or as many as you are happy with

Put an appropriate length piece of Ali scaffold pole or ladder truss in the couplers - pole can be hard to get hook clamps over as it may be close to the timber, unless you drop with studding etc 

Clamp to the pole / ladder

Prepare for a lot of dust on top of the beam and for the beam to be marked by the straps if it is rotten.

 

[TomHoward]

If it’s important it doesn’t wobble you may want to make a couple of wedges or a V shaped back to fit the round beam

[kerry davies]

Span the two horizontal logs with a scaffolding pole fixed with ratchet straps over the scaffold bar and under the log then suspend off that? It is quite surprising how solid simple friction can be on poles like those.

Personally I would span side to side on the beams supported by your logs. 

 

[sunray]

run a truss across top of both logs, fix with ratchet straps.

Edited July 13, 2022 by sunray
If you don't want truss up there use a decent timber 6"x2"or bigger

[sunray]

1 minute ago, sunray said:

run a truss across top of both logs, fix with ratchet straps.

beaten to it

[Ynot]

6 hours ago, TomHoward said:

....marked by the straps if it is rotten.

Wry smile at that bit - if it's rotten, WTF are you even considering hanging even a birdie off it??!!!
😄 😄 😄

[Ynot]

But if a little wobble isn't a major problem, surely for a single fixture (on a solid log beam...) 2 or 3 slings onto a scaff pole should do the trick - easy peasy.

That said - does the log beam have any SWL detailed for it?
I've little doubt that it would support what you're talking of, BUT the caveat there would be to check FIRST HAND how that horizontal is actually secured to the verticals. 

NEVER assume that because something looks strong and sturdy enough that it is properly suspended to take additional weight like this.

[sunray]

8 hours ago, Ynot said:

But if a little wobble isn't a major problem, surely for a single fixture (on a solid log beam...) 2 or 3 slings onto a scaff pole should do the trick - easy peasy.

That said - does the log beam have any SWL detailed for it?
I've little doubt that it would support what you're talking of, BUT the caveat there would be to check FIRST HAND how that horizontal is actually secured to the verticals. 

NEVER assume that because something looks strong and sturdy enough that it is properly suspended to take additional weight like this.

Or indeed that it is even a timber.