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The Mega84

gb Offline AimlessWanderer

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The Mega84
on: August 30, 2015, 05:49:09 PM
..... has begun  :ahhh :ahhh :ahhh

There's a couple of SAK mods I've been considering for quite a while, and after a lot of patient searching and spending, I finally got the parts together that I needed about 12-18 months ago. Since then those donor knives have just sat in a drawer, untouched (though occasionally carried/used)  ::)

I've spoken about doing SAK mods, bought donors, sold pin stock, and even advised on doing SAK mods, but never actually completed anything more than a scale swap  :facepalm: Time for that to change, and the whole point of me making this opening post is to make it significantly more difficult for me to bail out of the uncompleted project  :rofl:

Obviously, the advice given is to start small and do a simple cheap mod which doesn't matter if you wreck it, and obviously I've completely ignored that and gone for the most expensive and ambitious project first :dwts: Two of the five (yes five) donors are broken down, the first ambitious part of the project has revealed that it's not as straight forward as I'd hoped (needs some thought and careful grinding), and my right thumb has failed a N_N_R style impromptu skin durability test  :whistle:

More to follow later, once I've overcome the first obstacle....


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us Offline SteveC

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Re: The Mega84
Reply #1 on: August 30, 2015, 06:09:28 PM
 :popcorn:


gb Offline AimlessWanderer

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Re: The Mega84
Reply #2 on: August 30, 2015, 06:45:18 PM
Crap!!!    IDIOT!!!!

Third knife apart, second problem becomes apparent, and it's a biggie!  :facepalm:

This is going to need some careful thought.....  :think: ....more careful than before  ::)


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gb Offline AimlessWanderer

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Re: The Mega84
Reply #3 on: August 30, 2015, 06:48:56 PM
This could be at least a three beer problem. First one is open already, so remedial planning is underway


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wales Offline hiraethus

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Re: The Mega84
Reply #4 on: August 30, 2015, 06:52:05 PM
This should be good. :popcorn: :drink: :pok: :D


gb Offline Sparky415

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Re: The Mega84
Reply #5 on: August 30, 2015, 07:10:04 PM

Nothing like making a rod for your own back!

I’m going to sit here and watch now Mate  :popcorn: :popcorn: :popcorn:

(Yep its a three popcorn thread )
Everything’s adjustable


gb Offline Zed

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Re: The Mega84
Reply #6 on: August 30, 2015, 07:57:23 PM
I was like this with my CS go phillips mod,waited ages too do it,but once i did it i was surprised at how easy it was,ill be watching with anticipation  :popcorn:


gb Offline AimlessWanderer

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Re: The Mega84
Reply #7 on: August 30, 2015, 07:58:48 PM
Beer number one finished

So....

Problem two is bigger than problem one

I may be able to fix problem two. Unconventional, but could work

I have enough tools for three attempts at solving problem two, but there is a risk of causing backspring issues, and I only have one spare backspring.

If problem two is not solved, this might mean I have to address problem one in a different way

I need to get problem one fixed first time, as there are no spare tools

Therefore, solution for problem two needs a test build to prove the concept.

Once the tools are modified and concept proven, they can be reused in the finished build and I'm all clear to regrind to other tool to fix problem one

..... I think  :think:

Beer number two opened


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hr Offline styx

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Re: The Mega84
Reply #8 on: August 30, 2015, 08:39:38 PM
When you get to beer #6 you'll figure it all out
Solving problems you didn't know you had in the most obscure way possible

"And now, it's time to hand this over to our tame race axe driver. Some say, he can live in the forest for six months at a time without food, and he knows of a secret tribe of only women where he is their God. All we know is, he's call the Styx!" - TazzieRob


hr Offline enki_ck

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Re: The Mega84
Reply #9 on: August 30, 2015, 08:49:41 PM
Shouldn't this be the Mega 85? ;)

You were talking about a mod on a Wenger Nomad for the last few years if I remember correctly. :think:


gb Offline AimlessWanderer

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Re: The Mega84
Reply #10 on: August 30, 2015, 09:00:48 PM
When you get to beer #6 you'll figure it all out
When I get to beer 6, the back door opens, and the problems get resolved by velocity and distance  :P


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gb Offline AimlessWanderer

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Re: The Mega84
Reply #11 on: August 30, 2015, 09:02:50 PM
Shouldn't this be the Mega 85? ;)

You were talking about a mod on a Wenger Nomad for the last few years if I remember correctly. :think:

I was! A Traveller plus Phillips layer. That should be a lot more straight forward which is why I'm doing this one first ....
 :facepalm:


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gb Offline AimlessWanderer

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Re: The Mega84
Reply #12 on: August 30, 2015, 09:06:30 PM
Beer number two completed. No success. Engage cheat mode!

If the questions keep giving you answers you don't like, start asking different questions. Let's look at the whole problem differently....

Commence beer three.


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hr Offline enki_ck

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Re: The Mega84
Reply #13 on: August 30, 2015, 09:07:01 PM
Well I've been doing my 84mm mod for the last 3 years and it's still in parts. :doh:

And my 85mm Urban will probably be taken apart and redone in a different configuration soon. For the 4th time. Or is it 5th. :facepalm:

So yes, I understand your pain. ;)


gb Offline AimlessWanderer

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Re: The Mega84
Reply #14 on: August 30, 2015, 09:35:13 PM
Whether or not this works well enough, influences what goes up for sale next. I kind of need to do the awkward one to know if the easier ones are worth doing. The ironic part though is that to build this awkward one, I'm actually breaking down a few knives that are hard to come by.

If I can get this one to work, it's more likely to see frequent pocket duty than the other two mods I have planned. It won't work as I originally imagined it, but I just need to decide which feature to sacrifice in order to retain the others


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hr Offline styx

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Re: The Mega84
Reply #15 on: August 30, 2015, 09:46:56 PM
When you get to beer #6 you'll figure it all out
When I get to beer 6, the back door opens, and the problems get resolved by velocity and distance  :P

still counts as a solution
Solving problems you didn't know you had in the most obscure way possible

"And now, it's time to hand this over to our tame race axe driver. Some say, he can live in the forest for six months at a time without food, and he knows of a secret tribe of only women where he is their God. All we know is, he's call the Styx!" - TazzieRob


gb Offline AimlessWanderer

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Re: The Mega84
Reply #16 on: August 30, 2015, 09:59:16 PM
Ok, here goes.... this was the original plan:


93mm Awl                     Plain Blade
(corkscrew with mini driver)

Scissors

Saw

Nail file                            Serrated Blade
(round can key Phillips mounted backwards)

Bottle Opener                    Can Opener
(awl slot vacant to allow space for reversed Phillips)


Problem 1:
93mm awl sits way too high. IF the awl remains in this position, a modified kick should allow it to drop low enough to have the point below scale height.

Problem 2:
The tang on the Phillips is not symmetrical like I thought, which means it can't be reversed


Option one:
Bring serrated blade layer forwards to allow Phillips to be kept in same orientation. This moves the can opener back a layer, plus one extra spacer (needed as awl backspring isn't quite thick enough to provide a big enough void). This means the can opener might work on some smaller diameter cans, but not on larger ones.

Option two:
As option one, but grind can opener into a technicians driver

Option three:
Shorten tang on Phillips and re-drill at the other side. This allows a slightly shorter Phillips to be inversely mounted. Liners would need modifying, and this is VERY risky, with no second chances

Option four:
Shorten tang on CORKSCREW and reduce the other end by half a turn to put the point "safe" when mounted backwards. Mount Phillips "correctly" in outer slot.

Option five:
As option two, but ditch the awl and use combo tool to recover can opening ability


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gb Offline AimlessWanderer

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Re: The Mega84
Reply #17 on: August 30, 2015, 10:11:30 PM
Tools broken down so far are Rancher, MFV+, and Sportsman


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ca Offline Syph007

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Re: The Mega84
Reply #18 on: August 30, 2015, 10:11:49 PM
I reversed a phillips on a Ti 91mm mod and boy what a pain!  I filled the hole with brass, then drilled a new hole, AND had to change the angled part of the part that mates with the back scale. 

« Last Edit: August 30, 2015, 10:17:22 PM by Syph007 »
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gb Offline AimlessWanderer

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Re: The Mega84
Reply #19 on: August 30, 2015, 10:12:21 PM
When you get to beer #6 you'll figure it all out
When I get to beer 6, the back door opens, and the problems get resolved by velocity and distance  :P

still counts as a solution

 >:D


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gb Offline AimlessWanderer

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Re: The Mega84
Reply #20 on: August 30, 2015, 10:18:13 PM
I reversed a phillips on a Ti 91mm mod and boy what a pain!  I filled the hole with brass, then drilled a new hole, AND had to change the angled part of the part that mates with the back scale.

Thanks Robert  :tu:

Personally I considered filling the hole, but using brass could lead to galling (brass on brass) and I'd have to use a drill press with a core drill to avoid push off between the two metals and stop it favouring the brass.

I'm using a cordless drill on my kitchen table  :facepalm:

Only other option for me would be to go and have a work with an old mate to see if he could TIG weld it up for me, then grind flush, then drill. Risks there are thermal distortion, and if the weld chills I'm back to needing a drill press

EDIT: gorgeous looking mod BTW  :salute:
« Last Edit: August 30, 2015, 10:19:46 PM by 50ft-trad »


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ca Offline Syph007

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Re: The Mega84
Reply #21 on: August 30, 2015, 10:36:03 PM
Oh for the 93mm awl, you have to relocate the pivot hole on that one as well and regrind the pivot to be the same shape as the other 84mm tools.  It works as is on a 91, but not on an 84.
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gb Offline AimlessWanderer

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Re: The Mega84
Reply #22 on: August 30, 2015, 10:57:02 PM
Oh, I was just going to regrind the kick so it closed further. Will that not work? I realised the arse end will be stuck up a bit, but didn't think it was a full tang rework. Was it just to get it to sit parallel, or is there something else I've missed (so I know what to watch for when I'm doing it)


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gb Offline AimlessWanderer

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Re: The Mega84
Reply #23 on: August 30, 2015, 11:28:23 PM
I think tomorrow I'm going to try option 2 as described above and see how it works out. All I'm sacrificing is one can opener, and there'll be a couple of spares from the other donors if I change my mind later.... in fact I might as well build it up in tact first (option 1), and see what cans it might work on.

I know the awl will sit dangerously high at this stage, but it'll give me an overall feel of the knife and guide me as to subsequent changes.


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ca Offline Syph007

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Re: The Mega84
Reply #24 on: August 30, 2015, 11:52:52 PM
Oh, I was just going to regrind the kick so it closed further. Will that not work? I realised the arse end will be stuck up a bit, but didn't think it was a full tang rework. Was it just to get it to sit parallel, or is there something else I've missed (so I know what to watch for when I'm doing it)

Ya I did it that way to it would sit parallel.  :D

84mm modding is a pain!





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gb Offline AimlessWanderer

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Re: The Mega84
Reply #25 on: August 31, 2015, 12:00:58 AM
Thanks mate  :cheers: That makes more sense now. I'll do the test build tomorrow and see how sensible everything looks. I'd rather not go to that extent on the tangs if I can help it, and I need to see if I can make it work (for me) a different / easier way. I don't have the time or facilities for anything too elaborate. Grinding a little off here or there is one thing, but reforming and redrilling entire tangs is not what I had in mind  :D


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gb Offline AimlessWanderer

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Re: The Mega84
Reply #26 on: August 31, 2015, 03:10:09 PM
All knives are now apart, and the micrometer and vernier calipers have come out to play. Due to the assorted ages of the knives, the main blades vary from 2.0mm to 2.4mm. This actually does me a favour though, as the tang on the 93mm awl is thicker than a standard 84mm nail file, small blade, or combo tool.

Awl plus segmented spacer = 2.8mm, so I need the thicker spring. However, the thicker spring only measures 2.3mm. I also need to use selective assembly on the liners too. They have differing offsets where they have been stamped, giving different effective thickesses at different points, and I also need to carefully choose another layer for modification. Due to the configuration of the knife, I need three liners with the corkscrew/phillips cutout, but out of these five donors I only have two (from the Salesman and Sportsman).

Once I've matched everything up as good as possible, modified the liners and tangs as necessary, I still need to make a couple more decisions; firstly whether any additional washers are needed to get smooth function but also let the scales sit flat, and secondly whether to use any of the stock scales or something different  :whistle:


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gb Offline AimlessWanderer

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Re: The Mega84
Reply #27 on: August 31, 2015, 04:28:36 PM
Cutting up the b/s awl to make a tapered backspring support with no vice a cordless drill and a few handtools is f-f-f-frustrating to say the least

 :bnghd: :wait: :mn: :rant:


The cantankerous but occasionally useful member, formally known as 50ft-trad


gb Offline AimlessWanderer

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Re: The Mega84
Reply #28 on: August 31, 2015, 04:33:52 PM
YOU SMURFING AWKWARD SMURFING THING!!!!!  :rant:


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gb Offline AimlessWanderer

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Re: The Mega84
Reply #29 on: August 31, 2015, 04:41:16 PM
If at first you don't succeed.... swear louder

If you still don't succeed..... have a little break before trying again

If you still don't succeed..... cheat!

It's only there to tension the backspring, anneal it  >:D



(if that doesn't work, the 4.1/2" angle grinder is coming out  :mn:)


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