Author Topic: Big Wall Dog (aka Show us your home shop!)  (Read 3480 times)

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Offline Garbonzo

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Big Wall Dog (aka Show us your home shop!)
« on: November 16, 2009, 09:21:54 pm »
Now if I could train him to carry a haul bag...




I decided that my first new project with my new sewing machine would be a shameless knock off of a Fish One-Night-Stand, reusing the corner and side pieces from my loaner ledge (3rd or 4th hand ebay special, rather old).  Not done yet, still need to do the foot bucket and my own set fo straps (the old fish ones have plastic buckles)


"New" machine, a 1 hp, pnuematic, computer controlled walking foot monster


Old machine, just a simple straight stitcher.  Now I can leave it setup with lighter weight thread and usually just leave the binder attachment on it (PITA to swap out).


If I'd known then what I know now I wouldn't have gotten this tacker, only a 28 stitch.  Still it's very handy for things like alpine aiders, daisy chains loops on things like ledge straps or ledge bottoms.  Also handy for slinging your own hooks (i.e. not full strength stuff).
« Last Edit: November 16, 2009, 09:23:59 pm by Garbonzo »

Offline thylaxene

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Re: Big Wall Dog (aka Show us your home shop!)
« Reply #1 on: November 17, 2009, 02:23:48 pm »
If I'd known then what I know now I wouldn't have gotten this tacker, only a 28 stitch.  Still it's very handy for things like alpine aiders, daisy chains loops on things like ledge straps or ledge bottoms.  Also handy for slinging your own hooks (i.e. not full strength stuff).

Oh do please tell. Why was getting a bartacker not such a good idea? I've read that piece on ST about how one can make do with 5 rows of straight stitch going back and forth 4-5 times. Is that what you mean?

I myself just bought an old Singer so I can try and re-make the bed on my portaledge. So I'd be interested in hearing more of your experience. As I'm hoping to add daisy chain gear clip-ins along the bottom edge as well.

Cheers.

Offline Mike.

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Re: Big Wall Dog (aka Show us your home shop!)
« Reply #2 on: November 17, 2009, 03:39:16 pm »
Nice buncha tools, Garbo. Nice looking doggie, too.


You, Gabe, BLaw and Theron do all my work. And that's a whole lotta tools collectively. No redundancy at my pad. Oh, yes I do have a kitchen floor.
Say no to limbers, excavators and retro-bolters. No matter how much he smiles.

Offline Garbonzo

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Re: Big Wall Dog (aka Show us your home shop!)
« Reply #3 on: November 17, 2009, 05:06:53 pm »
Oh do please tell. Why was getting a bartacker not such a good idea? I've read that piece on ST about how one can make do with 5 rows of straight stitch going back and forth 4-5 times. Is that what you mean?

I myself just bought an old Singer so I can try and re-make the bed on my portaledge. So I'd be interested in hearing more of your experience. As I'm hoping to add daisy chain gear clip-ins along the bottom edge as well.

Cheers.

I'm not saying that a bartacker is a bad thing, but I got a 28 stitch one which just ain't good enough.  At the time I thought I could upgrade it to 42 stitches, which is true, but the price tag for all the replacement parts to change it to a 42 stitch came in at about $600.  So when I get around to it I'm going to sell it to recoup some of my money and get the real deal.

Regarding stitches, you are 100% right, there is nothing magical about a bar tacker.  In fact bar tacks create stress risers that make them one of the weakest ways to join webbing to webbing (i.e. 6 or more tacks only nets ~60-70% of the webbing strength max).  Long rows of stitches back and forth in gentle zig-zags distribute the stress much more evenly and are the strongest (albeit most labor intensive) stitch pattern.  Bar tacks are plenty strong enough, and are very fast and repeatable in a factory setting making them ideal, but not magical as many have come to think.

The rule of thumb I got from On-rope (good reference book) is that for well distributed stitches you get about 1.8x the thread breaking strength per stitch (2 strands of thread would ideally get 2x, and empirically they typically got a 10% reduction in testing).  #69 thread gets you ~10 lb break strength, #92 around 15 lbs, and #138 around 22 lbs depending on the source),  So to get full strength on 1" mil-spec webbing you need >225 stitches in #69 (think 5 bar tacks worth, or 10 rows of 2.25 inch overlap 10 stitch per inch in long zig-zags).  That number drops to 150 stitches in #92, and 100 stitches in #138.  For good measure a good 25-50% overkill is well justified to allow for UV, abrasion, and general margin.

Now obviously for many things you don't need the sewn joint to get full webbing strength, such as stuff sack handles, russian aider cuffs, water bottle clip in loops, etc.  Also many joints have either a pulley effect on them, or are in the middle of a sandwich, and such situations can easily reduce the minimum stitch count by 2x or even 4x.

Offline thylaxene

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Re: Big Wall Dog (aka Show us your home shop!)
« Reply #4 on: November 17, 2009, 07:55:32 pm »
@Garbonzo

Thanks mate for the great explanation!

Cheers.

Offline mungeclimber

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Re: Big Wall Dog (aka Show us your home shop!)
« Reply #5 on: November 17, 2009, 11:36:59 pm »
I'd post my speedy sticher, but I haven't used near enough thread to be proud of her yet.

I remember the Strassman BW book said a speedy sticher was essential or some such thing. Anybody still bring one?

skully

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Re: Big Wall Dog (aka Show us your home shop!)
« Reply #6 on: November 18, 2009, 05:42:27 am »
"Speedy" is a relative term.
Yes, I still use my "slow & tedious" stitcher.

Offline Mike.

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Re: Big Wall Dog (aka Show us your home shop!)
« Reply #7 on: November 18, 2009, 08:42:10 am »
Speedy Stitcher is a deuce-mandatory item from the A5 Big Wall Tech manual. I substitute duct tape.


Skullymon, what's up? Ya gettin mobile soon? Now?
Say no to limbers, excavators and retro-bolters. No matter how much he smiles.

skully

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Re: Big Wall Dog (aka Show us your home shop!)
« Reply #8 on: November 18, 2009, 09:33:15 am »
Very soon.
Of course, I'm like a "speedy" stitcher, too.
Slower than I'd like to be.
I'll keep ya informed.        WooT!

Offline mungeclimber

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Re: Big Wall Dog (aka Show us your home shop!)
« Reply #9 on: November 18, 2009, 10:44:44 am »
Speedy Stitcher is a deuce-mandatory item from the A5 Big Wall Tech manual. I substitute duct tape.


ah, that's the ticket!


Offline YetAnotherDave

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Re: Big Wall Dog (aka Show us your home shop!)
« Reply #10 on: November 18, 2009, 01:22:45 pm »
My sewing machine is beefy for a home machine but far from industrial, so I use the Speedy Stitcher for what it can't handle.  Neither really rate pics  :)

I used the SS to add daisy chains to my midsize haulbag before my last wall - stitches got a bit messy but are plenty strong. 

Offline T Moses

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Re: Big Wall Dog (aka Show us your home shop!)
« Reply #11 on: November 21, 2009, 01:55:44 pm »
Cool stuff Garbonzo!  I love machinery. 


This photo is from the regular shop.  I recently acquired a "new" to me mill.  It ain't purdy but it'll run like a whipped dog.