What can be used to absorb limb drops?

[ZinTrees]

What's it matter? UK arborist training manual is excellent.

The matter is you're using a term for something that isn't right, and trying to tell us that it is, it would be correct if you live in the uk

Since you feel the need to try and correct us, while using improper terminology, and showing multiple signs that you are brand new to tree work, I will suggest finding someone to train you in person before you get someone seriously injured, I've been almost killed on 2 occasions because of people like you


I'm done here, you've had your answers, you're just arguing it at this point for no reason, gday


EDIT: spelling

 

[Del_]

I don't have a big problem calling zip lining negative rigging if it involves a 'hold back' or 'pull back' line. If it doesn't, it's not.

The term 'negative rigging' has traditionally been used to describe piecing down a tree trunk and catching the sections with a block rigged to the trunk just above the cut where the section is in free fall for a short amount of time resulting in 'shock loading' of the rigging point. By this definition rigging a zip line that is vertical would not be 'negative rigging', IMO, as there is little or no shock loading of the zip line.

If vertical zip lining is the only way a climber uses a zip line then they are leaving a lot of more useful zip lining techniques on the table.

 

[MrTreeGuy]

I don't have a big problem calling zip lining negative rigging if it involves a 'hold back' or 'pull back' line. If it doesn't, it's not.

The term 'negative rigging' has traditionally been used to describe piecing down a tree trunk and catching the sections with a block rigged to the trunk just above the cut where the section is in free fall for a short amount of time resulting in 'shock loading' of the rigging point. By this definition rigging a zip line that is vertical would not be 'negative rigging', IMO, as there is little or no shock loading of the zip line.

If vertical zip lining is the only way a climber uses a zip line then they are leaving a lot of more useful zip lining techniques on the table.

I like to see negative rigging as a general term for when a climber is piecing out the trunk.

But what my crew was trying to do was negative rig with a vertical speed line attached to the trunk. The drop area is very small and the diameter of the sections are huge. It was a job no other one in town wanted to tackle because of the constraints.

 

[MrTreeGuy]

I like to see negative rigging as a general term for when a climber is piecing out the trunk.

But what my crew was trying to do was negative rig with a vertical speed line attached to the trunk. The drop area is very small and the diameter of the sections are huge. It was a job no other one in town wanted to tackle because of the constraints.

I like to see negative rigging as a general term for when a climber is piecing out a trunk because what they do while sectioning varies from climber to climber.

What my crew was trying to do was piece out a very large diameter trunk with a very small drop zone. It seemed like a job no other tree company wanted to tackle because of the constraints. The only way to complete this job is to use a vertical speedline to catch the sections when they hit and not bounce.

I see many of these incomplete jobs around town because of these same constraints.

 

[Del_]

I like to see negative rigging as a general term for when a climber is piecing out the trunk.

What my crew was trying to do was piece out a very large diameter trunk with a very small drop zone. It seemed like a job no other tree company wanted to tackle because of the constraints. The only way to complete this job is to use a vertical speedline to catch the sections when they hit and not bounce.

You can use the term how you want but your usage is not how the industry uses the term.

A vertical speed line is never the only way to complete a job.

 

[MrTreeGuy]

You can use the term how you want but your usage is not how the industry uses the term.

Well that's the thing, the industry doesn't have a set term for negative rigging. If you can give me a credible source I'll change my mind.

 

[Del_]

Well that's the thing, the industry doesn't have a set term for negative rigging. If you can give me a credible source I'll change my mind.

I'm not interested in changing your mind.

That's something you are going to have to work on yourself.

 

[ZinTrees]

Well that's the thing, the industry doesn't have a set term for negative rigging.

Every reply here has been telling you that there is a set term, the entire industry world wide has agreed on it, no credible source needed

What my crew was trying to do was piece out a very large diameter trunk with a very small drop zone. It seemed like a job no other tree company wanted to tackle because of the constraints. The only way to complete this job is to use a vertical speedline to catch the sections when they hit and not bounce.

Easy, negative rig or shove firewood off, move each piece so there's nothing to bounce off, we do this every day, if you want to get real fancy then crane the pieces out

 

[MrTreeGuy]

Every reply here has been telling you that there is a set term, the entire industry world wide has agreed on it, no credible source needed

Easy, negative rig or shove firewood off, move each piece so there's nothing to bounce off, we do this every day, if you want to get real fancy then crane the pieces out

Crane would make the job too expensive and our bid wouldn't be accepted. I feel negative rigging still has too much peak loads for my likings here because of how large the diameter of the sections are. I like the vertical speedline method here because of the smaller peak loads and better control of the piece once it hits the ground. I saw a video the other day where they cut a section, bounced on a log at the bottom and took out the neighbors concrete walls.

 

[ZinTrees]

Crane would make the job too expensive and our bid wouldn't be accepted. I feel negative rigging still has too much peak loads for my likings here because of how large the diameter of the sections are. I like the vertical speedline method here because of the smaller peak loads and better control of the piece once it hits the ground.

"Better control of the piece once it hits the ground" won't be better than negative rigging

There's really no peak load on a properly done negative rig, if it's done correct the only thing the climber feels is the chunk smacking the stem and a slight side pull on the spar

Not my picture, but it proves my point, there isn't a tree you can't negative rig, just gotta have the right equipment and knowhow

Negative rigging is possibly the most basic form of rigging for most of us, the only thing stopping you is, you

 

[TheJollyLogger]

Well that's the thing, the industry doesn't have a set term for negative rigging. If you can give me a credible source I'll change my mind.

Yeah, you're using the term wrong. Negative rigging is any time you've rigged a piece from below, involving a brief moment of free fall before capture

 

[Cricket]

depends on the size limbs and whats available, a brush pile works excellent, logs can be a safety hazard so we avoid those

usually we just cut and drop stuff, or rig it, no crash pad needed if you do it right


edit, re-read OP's post
if you're negative rigging, you don't need a crash pad of any sort since the pieces won't be free falling all the way to the ground, if they are then you wasted all that time setting rigging for no reason

Re: logs can be a safety hazard

I had to do a controlled roll of a half a maple tree off the back of my cellarway a few years back - way bigger than any saw I had was up for. It flipped and came down exactly where I intended it to - but that was on top of my hand gun bullet trap, which is constructed of power poles stacked offset (so no spaces between) between four four inches lengths of iron sewer pipe. It flipped that top log - seven feet by 12" - off the top of that pile, like a tiddly wink. The whole maneuver required us all to be in places quite a ways from that, but it was still impressive how high and far that big stick went. Definitely is in my mind when dropping anything that might land on anything else, no matter how huge and heavy that anything else may be.

 

[ZinTrees]

Re: logs can be a safety hazard

I had to do a controlled roll of a half a maple tree off the back of my cellarway a few years back - way bigger than any saw I had was up for. It flipped and came down exactly where I intended it to - but that was on top of my hand gun bullet trap, which is constructed of power poles stacked offset (so no spaces between) between four four inches lengths of iron sewer pipe. It flipped that top log - seven feet by 12" - off the top of that pile, like a tiddly wink. The whole maneuver required us all to be in places quite a ways from that, but it was still impressive how high and far that big stick went. Definitely is in my mind when dropping anything that might land on anything else, no matter how huge and heavy that anything else may be.

flying logs are always a big issue, often times the bigger ones move more, we always try to avoid logs landing on other logs from any distance!