Compact Bulldog Bone

Tomi said:
Why do you prefer to attach the nano swivel directly to the bone instead of having a swivel on the bridge? I'm sure it's been discussed before but it's too much to read again. :) Is it to get the friction system closer to the harness? I've been thinking of attaching a smaller carabiner (DMM Shadow) directly to the bridge and wear that one out and have a nano swivel on the bone. Now I've got a DMM small swivel on my bridge.
Click to expand...
Im sure theres other reasons but i like my system as close as possible. When sitting in my saddle, i don't like to have to reach up for it. I like it at neck height when sitting in my saddle. It eliminates the tear drop which is like 2".
 
Tomi said:
Aluminium is really soft. The 7075 should take wear a lot better. I've got a few titanium pieces laying around... maybe I should get them to the water jet cutter and make a spine. :)
Click to expand...
Thats not a lot of ware at all in the photos. Still tons of life left.
 
TylerHoffman said:
Im sure theres other reasons but i like my system as close as possible. When sitting in my saddle, i don't like to have to reach up for it. I like it at neck height when sitting in my saddle. It eliminates the tear drop which is like 2".
Click to expand...

I also like the system as close as possible. If nothing else I want to reach the top of it easily on a long limb walk. Some times now with the RW I can't reach my prusik which is very annoying.
 
@Crazy_Jimmy Have you tried the tending test like dsmc explained a page or two ago and have you tried any other ropes other than ce tachyon in bone.? Are you certain your running middle sized bollard that came with bone 5/8 with bone.?Im just tring to run a checklist to eliminate possibilities of issue preventing smooth ascent.Do you have any desire to picture your entire setup while ascending ? I did a dual rope climb yesterday switching the bone and R.w. intermittently for tending at different times in the climb without changing anything other than clipping my chest tender to either the center hole of h.c. pulley or my bungee tender on the bone when changing system choice for main ascent . I'm only explaining this because if you have a RW and a RR and you don't have issues with them tending. There's a missing piece of information leading to the tending issue on bone . Are you tending from the spot on top arm with micro biner or full size? From the spine up the back ?
 
The BDB uses size 80 links (1" pitch). The wishbone uses size 60 links (3/4" pitch). The aluminum alloy 6061 seems to be wearing well so far, I will be curious to see how the new Bones with alloy 7075 stand up to wear at the spine.

I suspect, with the rope Jimmy is using, that the grooves on the inner arms need to be widened to advance nicely. I can do this for you Jimmy if you like.
My orange Tachyon has become stiff and slightly swollen with age.
 
Treetopflyer said:
Sounds like a shorter bridge would benefit you for that situation .
Click to expand...
I use about half of the green globe 3000 bridge that the tree motion comes with (super short bridge). I have also been thinking about attaching the bone directing to my bridge with the big eye of the nano since i don't really climb with anything else srt and because there is no need to take the bone off my bridge when climbing due to the easy on/off. This will be super compact!
 
Last edited:
surveyor said:
The BDB uses size 80 links (1" pitch). The wishbone uses size 60 links (3/4" pitch). The aluminum alloy 6061 seems to be wearing well so far, I will be curious to see how the new Bones with alloy 7075 stand up to wear at the spine.

I suspect, with the rope Jimmy is using, that the grooves on the inner arms need to be widened to advance nicely. I can do this for you Jimmy if you like.
My orange Tachyon has become stiff and slightly swollen with age.
Click to expand...
Both those alloy are aircraft grade right?
I bought a hank of orange tachyon on sale from Treestuff round thanksgiving , That has been the best all around performance for me ,but I climbed on imori green yesterday which was only slightly more control intensive on descent to not be jumpy on rope especially on descending swings ,but glided up like it was buttered up. I'd like to fit two thin twin cords in a compact and see if it would even bite ...through design I can't be sure.
 
I tried with two strands of 10mm beeline blue and it didn't work. Too tight. I would like to try 8mm or 9mm. I think the bone will creep.
 
I don't know if I asked this or not. I have a fairly new 150' hank of velocity at home. I stopped using it days after I got it because it was way too small for the zigzag. How's it do with the bone. Did someone say it wasn't firm enough?
 
I have read that the silica alloys stand up to wear better. From the web:

"6061 aluminum is used extensively as a construction material, most commonly in the manufacture of aircraft and automotive components. The 6061 alloy is well-suited to the construction of yachts, motorcycles, bicycle frames, scuba tanks, camera lenses, fishing reels, electrical fittings, couplings and valves. It’s used in the construction of aluminum cans, and the inside foil wrapper on food containers is often made with 6061 aluminum alloy. Aluminum-magnesium-silicon alloys are also used in wide-span roof structures for bridge decks and arenas."
"7075 aluminum is a cold-wrought alloy and the strongest of the aluminum alloys, or as strong as some lower-grade steel products, but it is lighter in weight. The principal alloying ingredients of 7075 aluminum are zinc and copper. Its other metallic elements include magnesium, iron, silicon, manganese, chromium and titanium, in descending order by quantity. As a result of these well- balanced properties, 7075 alloy sheet and plate products, such as those available from Sapa Extrusions, are commonly used in aerospace, defense and consumer products where strength, corrosion resistance and high stress-reduction capabilities are important. Alloy 7075 is typically available in the annealed state as well as several tempers of the T6, T73 and T76 types. 7075 aluminum is ideal for marine and automotive applications as well. Products where strength is critical, such as rock-climbing equipment, hang glider airframes and bike frames are commonly made from 7075 aluminum. Other uses include gears, missile parts, regulating valve parts, shafts (including Lacrosse sticks) and chassis plates, as well as in precision rifles, such as French PGM Precision arms and M16s for the U.S. military. Because it can be highly polished, 7075 alloy is also widely used in mold tool manufacture, particularly in the plastics industry."
 
yup. not firm which makes it creep. I tried old,fuzzy, and swollen velocity and it worked like a dream. Needs to be broken in a good bit.
 
Gordon if you used the # 100 size links do you think a bone could be produced similarly in size to compact yet wider to accommodate two thinner diameter cords side by side 9mm for emample with a wider bollard to achieve control ?I guess I could enjoy a thicker diameter as well . The limitation would ly in the width of the inner diameter of the links I'm assuming.
 
Last edited:
The size 100 links would likely accomodate two skinny ropes, and the larger dia. pins are nice for slack tending also, however the weight would become an issue. The double strand 80's would probably be a better choice for a double wide Bone.
 
surveyor said:
The size 100 links would likely accomodate two skinny ropes, and the larger dia. pins are nice for slack tending also, however the weight would become an issue. The double strand 80's would probably be a better choice for a double wide Bone.
Click to expand...
Yeah even dualing tachyons 11.5 would feel great in hand , but two 11mm would be great . what of opposing forces on the links. As in pulling them apart. These links are very strong ,no?!
 
You must log in or register to reply here.

New threads New posts

Kask Stihl NORTHEASTERN Arborists Wesspur TreeStuff.com Teufelberger Westminster X-Rigging Teufelberger
Back
Top Bottom