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Mine Exploration Forum

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Author Candidate for a Darwin award
Tamarmole

Joined: 20/05/2009
Location: Tamar Valley

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Candidate for a Darwin award
Posted: 04/07/2014 19:38:08
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In between trashing my Kong rakong rack and biting the bullet and buying a BMS long micro rack I came to the conclusion that the way forward was to go down the diy route.

To that end I produced a set of drawings and ordered up materials. By the time I had got everything together I had ordered the BMS and enthusiasm had waned. It would have ended there, however a mate with access to a machine shop offered to see the project through.

Anyway here it is. The frame is formed from 8mm 316 stainless. The bars are 1/2" nb Schedule 40 316.



(click image to open full size image in new window)



(click image to open full size image in new window)

I've yet to use it, it will be interesting to see whether I die or not.
IP: 86.152.99.99
royfellows

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Joined: 13/06/2007
Location: Great Wyrley near Walsall

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Candidate for a Darwin award
Posted: 04/07/2014 20:04:35
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Tamarmole wrote:



I've yet to use it, it will be interesting to see whether I die or not.


Unfortunately, if that happens you wont live long enough to know about it.
Laugh

--

Qualifications? Well, being doing it for 30 years and I'm still here.
IP: 2.98.224.49
Peter Burgess

Joined: 01/07/2008
Location: Merstham. Or is it Godstone ...... ?

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Posted: 04/07/2014 20:44:00
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Silly Tamarmole. All you do, is lend it someone else and watch.

--

The most useful idiot you can ever hope to meet...
IP: 92.10.152.214
RJV

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Joined: 16/03/2008
Location: Cleveland

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Posted: 04/07/2014 20:51:31
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Hope more time was spent on the design than was spent on the grid references in Moorland Caver! Tongue Innocent IP: 185.26.180.120
Tamarmole

Joined: 20/05/2009
Location: Tamar Valley

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Posted: 04/07/2014 20:59:40
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RJV wrote:

Hope more time was spent on the design than was spent on the grid references in Moorland Caver! Tongue Innocent


Where would be the challenge if the grid refs were correct?
IP: 86.152.99.99
davel

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Joined: 24/07/2007
Location: Gwynedd

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Posted: 04/07/2014 21:49:32
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I'm curious as to whether you bent the rod cold?

If so, did you do any heat treatment afterwards?

(My understanding is that 316 can be cold-formed, but it work hardens and annealing recommended in some cases.)

Dave
IP: 195.137.87.110
royfellows

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Joined: 13/06/2007
Location: Great Wyrley near Walsall

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Posted: 04/07/2014 21:58:47
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One of Roys asides......
When I was a teenager Albert Ashton who was the Blacksmith at Abermule always told me:
"Never work cold metal Boyken"

--

Qualifications? Well, being doing it for 30 years and I'm still here.
IP: 2.98.224.49
Tamarmole

Joined: 20/05/2009
Location: Tamar Valley

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Posted: 04/07/2014 22:01:15
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davel wrote:

I'm curious as to whether you bent the rod cold?

If so, did you do any heat treatment afterwards?

(My understanding is that 316 can be cold-formed, but it work hardens and annealing recommended in some cases.)

Dave


Heat formed.
IP: 86.152.99.99
royfellows

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Joined: 13/06/2007
Location: Great Wyrley near Walsall

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Posted: 04/07/2014 22:03:22
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Relief!

I was going to suggest one of the Chinese krabs from Hong Kong to attach it.

Only kidding Rick
Big Grin


--

Qualifications? Well, being doing it for 30 years and I'm still here.
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Tamarmole

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Location: Tamar Valley

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Posted: 04/07/2014 22:05:02
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royfellows wrote:

One of Roys asides......
When I was a teenager Albert Ashton who was the Blacksmith at Abermule always told me:
"Never work cold metal Boyken"


A blacksmith friend once informed me that only the devil can forge cold metal
IP: 86.152.99.99
Tamarmole

Joined: 20/05/2009
Location: Tamar Valley

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Posted: 04/07/2014 22:07:20
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royfellows wrote:

Relief!

I was going to suggest one of the Chinese krabs from Hong Kong to attach it.

Only kidding Rick
Big Grin


Next step is to make my own crabs - can't be that difficult.Wink
IP: 86.152.99.99
ChrisJC

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Joined: 13/10/2007
Location: Northants

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Candidate for a Darwin award
Posted: 05/07/2014 06:45:59
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Anyone using a rack for mine exploration is a candidate for a Darwin award. Big Grin

Chris
IP: 86.170.166.9
rufenig

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Joined: 18/03/2008
Location: Shropshire Hills

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Posted: 05/07/2014 07:37:58
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ChrisJC wrote:

Anyone using a rack for mine exploration is a candidate for a Darwin award. Big Grin Chris


Guns RUBBISH!
A rack can be much more versitile than a Stop.
I.M.H.O. If you train and practice with it!

The only downside to a rack is that it needs a bigger step up and a bit more thought when doing a changeover.Smartass
IP: 80.189.223.228
RJV

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Joined: 16/03/2008
Location: Cleveland

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Posted: 05/07/2014 08:53:36
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Horses for courses. Racks suit those with limp wrists, Stops are fine for those with well exercised grips... IP: 82.145.222.22
J25GTi

Joined: 09/06/2012

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Posted: 05/07/2014 16:20:50
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Well we shall see if Rick is brave enough to use it tonight! I'll let him go first as if he falls to his doom I don't want to be stuck under all the hanging death he will bring down! Thumbs Up IP: 93.186.23.112
Drillbilly.

Joined: 09/12/2013
Location: adios

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Posted: 05/07/2014 18:24:29
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ChrisJC wrote:

Anyone using a rack for mine exploration is a candidate for a Darwin award. Big Grin

Chris


Anyone using anything other than a rack hasn't tried one and seen the light.

Once you've had rack, there's no going back!
IP: 195.166.146.171
Tamarmole

Joined: 20/05/2009
Location: Tamar Valley

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Posted: 05/07/2014 22:36:10
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J25GTi wrote:

Well we shall see if Rick is brave enough to use it tonight! I'll let him go first as if he falls to his doom I don't want to be stuck under all the hanging death he will bring down! Thumbs Up


Dropped the shaft on it -absolutely great, no problems.
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Drillbilly.

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Posted: 06/07/2014 12:53:35
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What is the feel like?

I have noticed that Ally bars on my Petzl 5 bar J racks seem to wear quite quickly. for a while). I'd say the top 2 bars wear to about 5mm grooves quite quickly and then an equilibrium is reached. The descents start lovely and smooth and as the rack wears, the friction seems to increase, to a degree, it's a tiny bit more than I'd like....without taking a bar out.

It seems that replacing the top 2 bars with SS jobs would be a very good thing.

I'd be interested in what the overall feel/speed is like.
IP: 31.53.64.123
Tamarmole

Joined: 20/05/2009
Location: Tamar Valley

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Posted: 06/07/2014 18:12:07
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Drillbilly. wrote:

What is the feel like?

I have noticed that Ally bars on my Petzl 5 bar J racks seem to wear quite quickly. for a while). I'd say the top 2 bars wear to about 5mm grooves quite quickly and then an equilibrium is reached. The descents start lovely and smooth and as the rack wears, the friction seems to increase, to a degree, it's a tiny bit more than I'd like....without taking a bar out.

It seems that replacing the top 2 bars with SS jobs would be a very good thing.

I'd be interested in what the overall feel/speed is like.


Stainless bars are faster than ally, however providing you are aware of this and compensate for it - no problem. They do give a very smooth ride. Heat dissipation is good if you use tube rather than bar. They are also much harder wearing than ally.

Replacing the top two bars strikes me as a good idea as these are the two which suffer the most wear. I really like the concept of a "hybrid" rack using a mix of SS and ally as appropriate.

If you do go down this route why not make the top bar a hyper bar, this will give you the option of turning your five bar rack into a six bar, it will also make lock offs a dawdle.
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exspelio

Joined: 02/05/2012
Location: peak district

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Posted: 06/07/2014 18:35:37
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I wonder about the practicality of putting a hyperbar on top of a "J" rack, seems like there may be a bit of "Chinese Wire Puzzle" threading to be done?

--

Always remember, nature is in charge, get it wrong and it is you who suffers!.
IP: 81.153.40.5
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