TreeLogic
Branched out member
- Location
- Coastal SC
Omni-Block 1.5
- Thread starter TreeLogic
- Start date
oldfart
Participating member
- Location
- Asheville, NC
Very pretty, indeed, TL. If you need to dial up the strength, try a basket: OmniBlock on Whoopie
Don't even get me started on that block. One of my favorites of all time. Girth a nice web sling into the eye.
Dead end your rig line below your intended cut and then out to another block somewhere in the crown (at a similar height), and then down to the lowering device. Make your face cut, choke the "Omni-Sling" above the cut and op the pulley on the rig line. Back cut and away it goes. We've lifted, swung, flung, slid, and zipped the pants of that friggin' pulley. The bounds of this rigging system are limited to your creativity. I love that block.
Have fun with it!
Dead end your rig line below your intended cut and then out to another block somewhere in the crown (at a similar height), and then down to the lowering device. Make your face cut, choke the "Omni-Sling" above the cut and op the pulley on the rig line. Back cut and away it goes. We've lifted, swung, flung, slid, and zipped the pants of that friggin' pulley. The bounds of this rigging system are limited to your creativity. I love that block.
Have fun with it!
- Location
- Toronto ON
I just bought this pulley specifically for the same setup as Ocean explained. I was using a Pinto and biner, connecting to a sling. But didn't like the risk of cross loading the biner.
The Omni block solved the problem and opened up the possibilities of many other rigging applications.
Defiantly my go to pulley for light rigging.
The Omni block solved the problem and opened up the possibilities of many other rigging applications.
Defiantly my go to pulley for light rigging.
TreeLogic
Branched out member
- Location
- Coastal SC
Oldfart, you're a smart old fart. As always your video was very informative and helpful. Now I got something else to splice.
Eric, I'm trying to picture what you're saying, but for some reason I'm not getting it. It's been a long day so, my apologies.
"Dead end your rig line below your intended cut and then out to another block somewhere in the crown (at a similar height), and then down to the lowering device."
So, is the rig line tied to the limb or the trunk? Is the Omni being lowered with the limb? I see we're trying to get MA here and I understand basic fiddle block set ups but I'm stumped. Maybe if I sleep on it I'll have eureka syndrome in the morning.
Thanks for your help with this.
Eric, I'm trying to picture what you're saying, but for some reason I'm not getting it. It's been a long day so, my apologies.
"Dead end your rig line below your intended cut and then out to another block somewhere in the crown (at a similar height), and then down to the lowering device."
So, is the rig line tied to the limb or the trunk? Is the Omni being lowered with the limb? I see we're trying to get MA here and I understand basic fiddle block set ups but I'm stumped. Maybe if I sleep on it I'll have eureka syndrome in the morning.
Thanks for your help with this.
tomthetreeman
Participating member
- Location
- Rhode Island
You're using the remaining wood as a fixed end for your two-block zipline (drift line?). Yes, the omni block is lowered with the piece.
Rigging line tied off below (or next to in some cases) intended cut, and through another block in the tree - OB attached to piece to be lowered. See now?
-Tom
Rigging line tied off below (or next to in some cases) intended cut, and through another block in the tree - OB attached to piece to be lowered. See now?
-Tom
TreeLogic
Branched out member
- Location
- Coastal SC
Thanks Tom, yeah I think I got it a little better. Wish one of y'all would put up a YouTube video of it.
I Googled "Omni block tree" and "arborist" yesterday and didn't get much. I'll figure it out.
So, removing a limb. Face cut in direction of desired bend. Strap Omni in same spot as you would a normal strap with biner. Other block in tree is located elsewhere in crown in desired direction of travel. Rigging line goes up through Portwrap, through secondary block, and then tied off with running bowline on the trunk-side (remaining stub) of the face cut. Pull slack from line, open Omni cheek plate, insert line and close. Make back cut, and the limb is now cradled between the tie off and secondary block, with mechanical advantage from the omni?
Thanks for babying me through this.
I Googled "Omni block tree" and "arborist" yesterday and didn't get much. I'll figure it out.
So, removing a limb. Face cut in direction of desired bend. Strap Omni in same spot as you would a normal strap with biner. Other block in tree is located elsewhere in crown in desired direction of travel. Rigging line goes up through Portwrap, through secondary block, and then tied off with running bowline on the trunk-side (remaining stub) of the face cut. Pull slack from line, open Omni cheek plate, insert line and close. Make back cut, and the limb is now cradled between the tie off and secondary block, with mechanical advantage from the omni?
Thanks for babying me through this.
Thanks, Tom.
Logic, look at Symbioun's avatar...with the two leaders. I'm not saying this should be done on a tree like that, but it may help with the explanation. Imagine you want to remove 5' from each spar in alternate manner. Get a rig line tied in a Running Bowline (RB) 6' down from the top of one spar. Set an Impact Block (IB) 6' down from the top of the other spar. Rig line goes from the RB, through the IB and down to the Lowering Device.
Make a face cut above the RB. Sling the Omni Block (OB) above the cut and connect the block to the horizontal leg of rigging line (between the RB and IB). Make the back cut and the piece will be rigged in between the RB and IB. The OB allows the piece being rigged to find a happy orientation.
There are many ways to use this technique with all sorts of other angles, pre-tensioning (sweating), preventing shock loading, drifting pieces away from a target below like a zip line when there's no room for a zip line.
My rope man likes that system because he can often run wood with less wraps on the Bollard since the load is shared above. For me, I just dig the sped you can work sections out since all you need to do is slide the RB down the stem and repeat if the IB can stay in it's location for the entire time. In fact, when the IB is higher than the RB, the rope man just puts the OB onto the line and pulls the slack out of the rig and the OB glides right to you.
Every rigging kit should have one of those blocks, IMHO.
Logic, look at Symbioun's avatar...with the two leaders. I'm not saying this should be done on a tree like that, but it may help with the explanation. Imagine you want to remove 5' from each spar in alternate manner. Get a rig line tied in a Running Bowline (RB) 6' down from the top of one spar. Set an Impact Block (IB) 6' down from the top of the other spar. Rig line goes from the RB, through the IB and down to the Lowering Device.
Make a face cut above the RB. Sling the Omni Block (OB) above the cut and connect the block to the horizontal leg of rigging line (between the RB and IB). Make the back cut and the piece will be rigged in between the RB and IB. The OB allows the piece being rigged to find a happy orientation.
There are many ways to use this technique with all sorts of other angles, pre-tensioning (sweating), preventing shock loading, drifting pieces away from a target below like a zip line when there's no room for a zip line.
My rope man likes that system because he can often run wood with less wraps on the Bollard since the load is shared above. For me, I just dig the sped you can work sections out since all you need to do is slide the RB down the stem and repeat if the IB can stay in it's location for the entire time. In fact, when the IB is higher than the RB, the rope man just puts the OB onto the line and pulls the slack out of the rig and the OB glides right to you.
Every rigging kit should have one of those blocks, IMHO.
TreeLogic
Branched out member
- Location
- Coastal SC
Really appreciate your time writing that. I got it now.
TreeLogic
Branched out member
- Location
- Coastal SC
oldfart
Participating member
- Location
- Asheville, NC
WOW!
Bill, I love that for both content and artistry!
OF
Bill, I love that for both content and artistry!
OF
TreeLogic
Branched out member
- Location
- Coastal SC
Thanks Tom!
I'm no Brian Kotwica but I get by.
I'm no Brian Kotwica but I get by.
TreeLogic
Branched out member
- Location
- Coastal SC
Kevin, never used it, but just going by imagination, the fact that the impact block is level with, or slightly higher than the running bowline, the piece being cradled between the two should have less movement than other rigging methods.
And you can make it travel laterally (and slowly) across a given area.
And you can make it travel laterally (and slowly) across a given area.
Logic, that drawing gets a full case of Hard Cider, complements of me! So cool.
Kevin S, that's the beauty of the system, as in many cases you can keep friction in the LD, holding the piece in a mostly horizontal leg of rig line, until it finds a middle and then you can lower.
I would not so much use it in an area where the piece would come into contact with other structures below as it found it's "middle", but more so where you want a piece to drift.
We used it today, in fact, dismantling a large Silver Maple arching over an historic library. I love setting it up on trees like Maple since they're rather excurrent and upright. I threaded the Rig Line through high unions in the crown and fastened the Running Bowline to the last leg. The rig went out of the crown and over to a Rr FS in a distant Cedar tree. We sweated it up with a simple fiddle block. This allowed me to tip tie the pieces and then descend to cut low and butt heavy. The pieces drifted out and across a swampy area and right to the chipper. The last union was the only one we didn't float, swing, or lift, because we lost our high redirects and it could be bombed to clear lawn.
By rights, today was more like a zip line, but we re oriented the use of the system for a few stems by pulling the rig line down between two redirects for a lifting application. I guess that's a way of thinking about it, actually, when using it in the crown of a single tree...more like a really short zip line that lowers pieces between any two points.
I also love the system because the rig line is static within the tree in more horizontal applications.
Kevin S, that's the beauty of the system, as in many cases you can keep friction in the LD, holding the piece in a mostly horizontal leg of rig line, until it finds a middle and then you can lower.
I would not so much use it in an area where the piece would come into contact with other structures below as it found it's "middle", but more so where you want a piece to drift.
We used it today, in fact, dismantling a large Silver Maple arching over an historic library. I love setting it up on trees like Maple since they're rather excurrent and upright. I threaded the Rig Line through high unions in the crown and fastened the Running Bowline to the last leg. The rig went out of the crown and over to a Rr FS in a distant Cedar tree. We sweated it up with a simple fiddle block. This allowed me to tip tie the pieces and then descend to cut low and butt heavy. The pieces drifted out and across a swampy area and right to the chipper. The last union was the only one we didn't float, swing, or lift, because we lost our high redirects and it could be bombed to clear lawn.
By rights, today was more like a zip line, but we re oriented the use of the system for a few stems by pulling the rig line down between two redirects for a lifting application. I guess that's a way of thinking about it, actually, when using it in the crown of a single tree...more like a really short zip line that lowers pieces between any two points.
I also love the system because the rig line is static within the tree in more horizontal applications.
TreeLogic
Branched out member
- Location
- Coastal SC
And no video of today's job?
I know I know, video doesn't pay the bills
I know I know, video doesn't pay the bills
TreeLogic
Branched out member
- Location
- Coastal SC
Well I appreciate that. I honestly can't believe how intelligent the whole tree worker crowd is. Proud to be a part of it!
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