Compact Bulldog Bone

monkeylove · May 13, 2015

DSMc said:
Interesting! I have both new unwashed, old washed and old unwashed Vortex and the new and old washed preform almost identical. The old unwashed is much slower to control inputs.

Exactly what I mean, so many variables and different results.

JT, you unwash a rope the same way you uncut a tree limb.

DSMc · May 13, 2015

My old washed Vortex feels just like a new one, does yours?

monkeylove · May 13, 2015

It feels like my old comfy pj's, problem is that got shorter and fatter. A lot like me with age, lol.

123Craig · May 14, 2015

Appreciate the rope replies guys. I know it's something that will just have to be tested, adjusted, modified - so many variables - weight, rope type, condition - then there's the bone.

What size diameter is the hole in the tear drop life support? - In particular would an ISC spine fit? - Would the mighty mouse thin end hang nice? - Wish I didn't have to ask this question - will never buy ISC again - just trying to use what I got for now.

Gordon must be a very busy man - I hate to trouble him with such a question - and I'll understand that as a manufacturer he may decline to answer it, but; How many Compact/Bulldog Bones have been made/sent out (and for how long? - 6 months, ect?)? - The reason I ask this is as a possible user it is my own personal judgement call on the effectiveness + safety of a product - I can never have too much information.

When I go to tell my boss I'm going to try climbing on his time using a product that is (officially at least) untested and unrated - I need to be ready to counter his doubts as best I can. I already trust that this device is very sturdily made and brilliant as so many on here have attested to that.

My boss is an exceptional faller - but what with running a business and trying to maintain a family life - he doesn't always have time like I to look up the latest climbing innovations.

Thanks

surveyor · May 14, 2015

The hole in the teardrop is 5/8". The first prototype Bulldog Bone was made in Aug. of last year, and there have been 4 batches sold since, each with a signed disclaimer.
It is built with size 80 chainlinks (both stainless and Neptune coated steel). The aluminum parts are currently 7075 alloy.

monkeylove · May 14, 2015

I thought they were made of Sugar & Spice and everything nice.

123Craig · May 16, 2015

Thanks surveyor.

A couple of things to sort out at work before I order/add myself to the waiting list. I'm new to this thread - I'll keep reading till I've read every post.

patrac · May 18, 2015

hallo from Czech repulic. I have small question about Bulldog bone. Sory for my english I´m Just beginner.
My question is about draw of bone. It is possible to obtain a picture of the size of Bone?
Just picture with a ruler or if anyone had directly drawing

Thanx for the answer. Best regards

Treetopflyer · May 21, 2015

patrac said:
hallo from Czech repulic. I have small question about Bulldog bone. Sory for my english I´m Just beginner.
My question is about draw of bone. It is possible to obtain a picture of the size of Bone?
Just picture with a ruler or if anyone had directly drawing
Thanx for the answer. Best regards

Hope this helps.. Its a beautiful climbing tool.

Treetopflyer · May 21, 2015

I have a slight wear on my spine that is causing some serious drift on occasion if I don't set the top arm up. Just happening recently . Not such a good pic . hard to get the light right .This is a bone from page 7 of tgis thread with 6061 allie not the new 7075.. i dont remember when that was i got it october last year?? I mix this up with ropewrench depening on tree and mood

patrac · May 22, 2015

Thank you very much for the picture. Sometimes I make something at home. So attracts me the idea of making a bulldog bone. On the picture is a first step.

And next my additional aids to climb trees. Home made

body is Stainless steel strength 8.8 and now 10.4 bolts industrial bearings and pulley made of ABS plastic.
Everything just for my use, it is not intended for sale.
https://www.dropbox.com/s/srkutgzs5zv46rl/2015-05-21 22.06.21.jpg?dl=0
https://www.dropbox.com/s/7gfm8xo7700aghj/2015-05-21 22.19.09.jpg?dl=0

Yes and about wear of Bulldog bone. Alu 6065 has strenght 220kg/mm2 alu 7075 - 520kg/mm2 and stainless steel 540-720kg/mm2
Therefore all use stainless steel. While it is heavier, but stronger

Treetopflyer · May 23, 2015

patrac said:
Thank you very much for the picture. Sometimes I make something at home. So attracts me the idea of making a bulldog bone. On the picture is a first step. And next my additional aids to climb trees. Home made body is Stainless steel strength 8.8 and now 10.4 bolts industrial bearings and pulley made of ABS plastic.
Everything just for my use, it is not intended for sale.
https://www.dropbox.com/s/ol9hc17e84vjp5j/2015-05-21 22.06.21.jpg?dl=0
https://www.dropbox.com/s/fiw7i9zx8tjcjnc/2015-05-21 22.18.53.jpg?dl=0

Yes and about wear of Bulldog bone. Alu 6065 has strenght 220kg/mm2 alu 7075 - 520kg/mm2 and stainless steel 540-720kg/mm2
Therefore all use stainless steel. While it is heavier, but stronger

That is some neat stuff you got going there.

macswan · May 23, 2015

Nice work patrac

JeffGu · May 23, 2015

Very cool. Huge fan of stainless steel. Peace of mind is worth the extra weight!
(I'm old... I don't move fast enough for a few ounces less wieght to be of any help!)

JTree · May 23, 2015

I had played around with the idea of a stainless spine, but was informed that the friction would also be modified, so I cannexed the idea. Lemme know how it works out. If the SS works, I'd like to get one made myself.

patrac · May 24, 2015

I am glad that the rollers but like .This is a topic of interest on the bones.

Just for kids at camp I stood lift. Kids loved it. But from Petzl tandem pulley has a bearing made of bronze. After one afternoon use, had a 1.5 mm crack :endesacuerdo:

.. bearing roller in the photo was used for the rest of the week. No signs of wear. Industrial bearings will last just more. about the bone from SS temperature friction is not so large in order to change the structure of metal. In the picture is the first test sample from ordinary iron.

surveyor · May 24, 2015

The stock roller of the Bones I make, (both 1/2" and 5/8" dia.) is the roller from the same high carbon steel roller that comes on a standard Roller chain connecting links. I have a bronze bearing insert that fits over the connecting chain link pin and inside the 5/8" steel roller, but the rope bears on this high quality steel. I am interested to see if your SS spine works, because the coefficient of friction is substantially less with SS than with aluminum. The 7075 alloy aluminum is hard to beat, as it is very nearly as strong as steel, but only about half the weight (each Bone has only about 5 oz. of aluminum parts), plus it makes a good heat sink.

patrac · May 27, 2015

ready to laser cut

and here is my next baby

https://www.dropbox.com/sh/cm7amukiuyvob26/AAC1DgKtUCHJGkXvRhFoQVJja?dl=0
for install rope to tree. maximum range 42m but only nylon fishing with iron ball 60g

Tico · May 27, 2015

patrac said:
ready to laser cut
and here is my next baby
https://www.dropbox.com/sh/cm7amukiuyvob26/AAC1DgKtUCHJGkXvRhFoQVJja?dl=0
for install rope to tree. maximum range 42m but only nylon fishing with iron ball 60g

Wow!!!

macswan · May 27, 2015

So yesterday I was a total yard sale. Forgot a bunch of my gear at home, and wound up having to borrow rope for a second TIP. Set a line with Aztec, put the bone on it, and it slipped under body weight. With the same bollard I use for tachyon. Totally shocked. I guess those Yale ropes are a bit thinner. So then I replaced that line with a piece of vortex. Worked pretty well. A little too squishy, nice in hand, but I prefer my kmiii. It was interesting to get on other ropes though.

But what I really realized was that with just one swivel to attach to on my bridge, I need that nano swivel on m'bone if I want to have two systems going. Having the bone non rotatable is totally bogus. Dammit. New gear to buy.