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2 hours ago, Stellaghost said:

Aahhh you guys worry too much will soon be a pain in the forums butt, actually in the treatment room as we speak

joking aside thanks a bunch guys take care oh and check your tackle just to be on the safe side

Regards Stephen 

That's the way..     my mate has prostate cancer, with extra's.  I had colon cancer myself.   It does show you what kind of person you are, cup half full or half empty🤗

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On 12/24/2021 at 11:35 AM, FridgeFreezer said:

 

On 12/24/2021 at 11:35 AM, FridgeFreezer said:

 

I've always wondered abut a concentric clutch release bearing as a difflock actuator for these sliding-collar style lockers.

 

@FridgeFreezer what did you do that for........ Between you and @Daan your dictating how I do my build lol. Seriously you've put thoughts in my head, from studying previous measurements I can fit something in there bloody tight but doable I think. Nothing on the net suitable so going to have to make something from scratch.

Inner axle case bore is 69mm and halfshaft diameter at splines is 42 mm, so that gives me 27mm to make a single acting hollow bore pneumatic cylinder, my ARB lockers only have O rings to keep air pressure in so I will also go down that route using the return spring built into the diff to push the piston home when air pressure released.

The beauty of this is that the diff lock mechanism will be totally protected by double thickness axle cases

Also I could install a back up cable system that could be stored away until needed pending a failure of pneumatic cylinder, thoughts and reactions are compulsory lol regards Stephen

Edited by Stellaghost
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I accept no responsibility - people should know better than to listen to idiots on internet forums! :SVAgoaway:

The reason I suggested concentric clutch release is that it doesn't need compressed air - the Volvos use engine vacuum, but a simple cable or passive hydraulic master/slave also appeal for simplicity of operation.

Not sure why you'd need to include a backup system, if it fails surely it's not too hard to lock it up by hand somehow if really needed?

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16 minutes ago, FridgeFreezer said:

I accept no responsibility - people should know better than to listen to idiots on internet forums! :SVAgoaway: well idiots should know better than to make suggestions lol

The reason I suggested concentric clutch release is that it doesn't need compressed air - the Volvos use engine vacuum, but a simple cable or passive hydraulic master/slave also appeal for simplicity of operation.  the problem is a clutch housing has masses of room compared to an axle tube, also double skinned axle caseing does not help, all the ones I looked at on the net are bulky and not very packagable

Not sure why you'd need to include a backup system, if it fails surely it's not too hard to lock it up by hand somehow if really needed? True, but I'm thinking if I put a manual system in so I don't have to crawl under a vehicle that could possibly be stuck in mud, having said that I could winch to dryer land

Regards Stephen

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On 12/31/2021 at 5:14 PM, FridgeFreezer said:

 idiots on internet forums! :SVAgoaway:

 

So having listened to said idiot lol a bigger idiot has started to see how doable it actually is, so the pictures below give an idea on the limited packaging space available 

Inside diff case20220102_103917.thumb.jpg.baeb4db73d009a383e648380b75fcb76.jpg

With halfshaft installed

20220102_104217.thumb.jpg.53723512eb79a81241bee0a46b2ef5af.jpg

going to have to remove some of that inner casing bulb

diff lock mechanism ,cylinder is going to need to move around 30mm

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diameter of bore to play with 69.7mm

20220102_104001.thumb.jpg.11c68f8dd6cc56686c7a313f4f1570da.jpg

Slightly undersized cylinder wall fitted to give an indication

20220102_104313.thumb.jpg.f64e6f2666041ea0c362507cc750ad07.jpg

this may end up being a lot of work for nothing but as I've said before nothing ventured nothing gained

potential problems

Fitting some sort of thrust bearing / mechanism to push on diff lock cog face

Choosing internal o ring type to withstand air pressure, axial and possibly rotational movement thinking ptfe ??

Feeding cylinder with compressed air once installed, insert air pipe through axle cases??

Fastening cylinder in place so it can be removed for seal replacement, i have ideas on this may get away with an aluminium crush tube arrangement that will nip cylinder in place once portal hubs installed and nipped up

Anyone think of anything else or even just say its a load of carp

Thoughts appreciated as always regards Stephen 

Edited by Stellaghost
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5 minutes ago, Stellaghost said:

Anyone think of anything else or even just say its a load of carp

Well I think you definitely shouldn't listen to me. That axle casing looks very tight - at least the Volvos are square and have a bit of wiggle room, the mogs seem to have just filled all the available space with more metal just in case :lol:

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19 minutes ago, Stellaghost said:

A wee bump @Ed Poore how's the box hunting going regards Stephen

******* **** I was there last week and completely forgot to have a hunt with Bob for the box, and I'm off up your way next week too :angry2:. I'll chase him up this evening and see what we can work out. Him finding time is the issue...

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25 minutes ago, Ed Poore said:

******* **** I was there last week and completely forgot to have a hunt with Bob for the box, and I'm off up your way next week too :angry2:. I'll chase him up this evening and see what we can work out. Him finding time is the issue...

As I said no rush but would be a nice option for me to have cheers regards Stephen

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So my mog axle lightweight project now has a new name, this will keep me straying close to names associated with other Unimog/ Landrover/ Buggy projects on this forum.

Name related to some comments here... and because it's built to last.......

So from now on it is affectionately being called..............

Sid the Roach

Regards Stephen

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So been having a wee bit of sedate pottering over the last couple of days exploring " idiot" suggestions

Started making pneumatic cylinder on lathe

20220102_113006.thumb.jpg.9ccc0d8154bf2e3632475eb38a2b9060.jpg

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slid into position not as far up as I wanted but bore tapers in so I will have to adapt 

20220109_150214.thumb.jpg.9648df8a7fd55f968aaf5feb90933590.jpg

from diff side

20220109_150253.thumb.jpg.ee128d2f073cd812f8e37ecb20de91d1.jpg

bench testing rig

20220110_155950.thumb.jpg.38b65adde2868d461f745c813c6ac92d.jpg

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Halfshaft in

20220110_160233.thumb.jpg.8c1494e465810d72392ce5c7e54a404b.jpg

20220110_160240.thumb.jpg.d35b058139c8a50bca26017d72a06b63.jpg

More to follow regards Stephen 

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Think I've got this packaging sussed

Managed to trim bulb with plasma cutter

20220111_135402.thumb.jpg.973c459c968311665e88723b9b38f17d.jpg

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because this didn't work 

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next problem cannot quite reach with disc grinder so bodging in order.. one shaft from knackered grinder

20220112_084641.thumb.jpg.58b0d8e0e6441a8d5efd7f7aea7d8e11.jpg

some heavy wall pipe

20220112_085115.thumb.jpg.e68642cb66e8371d1063fef356e89a0d.jpg

pressed together 

20220112_085559.thumb.jpg.a7f0fe6b067d3d1e4c297852bc221bf9.jpg

20220112_085846.thumb.jpg.494dc0b55874073fdf8e8d421cddf123.jpg

Grinder tightening nut welded on

20220112_091352.thumb.jpg.b57ae1c04d2e599da119d84e59880e94.jpg

sorted

20220112_092631.thumb.jpg.3db975dff68531624c4f8c9d07d4cc78.jpg

20220112_092700.thumb.jpg.39d0ffbf60b556433170b298d34fd369.jpg

then cleaned up with die grinder, burr and flap wheel had to thread air line through axle to achieve this 

20220112_094336.thumb.jpg.f49bce5e4d922d80f29f0df1bec31f2e.jpg

20220112_095454.thumb.jpg.b767034f80024430b154d099721b4e20.jpg

air cylinder piston cut to length

20220112_101253.thumb.jpg.a4e92617c58766e9d69ba47eb4656aa4.jpg

Placed into axle tube and air pipe connected

20220112_113146.thumb.jpg.540ffc083d3902fe9c7967ffcf1adb07.jpg

20220112_095302.thumb.jpg.4f423dd42ad5727194330a8b35f7903f.jpg

I then installed diff, video to follow

What's left to do, obviously make another one for rear axle 

Solder copper pipe in and feed through axle case, just don't know best way yet

Roll up an aluminium crush tube to keep cylinder tight in bore

Think that's about it regards Stephen 

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