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elbekko

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Posts posted by elbekko

    P38 winch bumper build

    in Tools and Fabrication

    Posted

    Indeed.

    I wonder if I can come up with some other way of doing that linear motion on the ring gear. Because it feels sort of silly to go linear -> rotary -> linear. Maybe just some sort of push/pull bowden cable that peeks out of the grille somewhere.

    Damn feature creep, I don't have time for this! :lol:

    P38 winch bumper build

    in Tools and Fabrication

    Posted

    Started on the build yesterday evening.

    First dry fit on the floor:

    20230607_170825.thumb.jpg.5fc9a66f10f72a8d6e2e8d0041a8ca47.jpg

    As you can see, a few minor issues <_<
    The hole for the freespool lever is too far forward - entirely my modelling (and measuring) error. The winch was a pig to measure, and it shows :(
    The cradle is a few mm too short, so the top and bottom plates touch the winch body. A 1.5mm washer each side seems to solve that, so will just weld it up with a bit of a gap, no biggie.

    Bigger issue is the freespool lever housing, that sticks up more than I thought, and is an issue for getting the winch in place. May have to tickle it with the grinder somehow...

    Either way, nothing a grinder and a welder can't solve.

    Carrying on with some fit-up on the car:

    20230607_205420cropped.thumb.jpg.4e319a40f91fc35b853901da28ae579d.jpg

    20230607_205424retouched.thumb.jpg.afec569dbc1bd38c30953351ad8be7c7.jpg

    Looking pretty decent. Took a little trimming around some weld seams on the chassis, and a notch out of the top plate to clear the washer reservoir.
    The inner wings will need some trimming for tyre clearance. The ends are also hanging low since they're not supported yet.

    And the body will need pulling straight, as the bumper is square but the body isn't :D

    After these pictures were taken, we drilled the holes in the cradle for mounting the winch, and fit that up. Forgot to take pictures of that part. Need to go buy some bolts too.

    More to come later on :)@Escape was kind enough to lend me a car to get home with, so I can take my time finishing this up.

    Something interesting I noted: the cradle feels light. Not sure if that's due to the S355 steel, or what, but for a huge chunk of 5mm plate it feels surprisingly light.

    • Like 3

    Battery/Starter cable ?

    in International Forum

    Posted

    1 hour ago, smallfry said:

    I would never be able to sleep at night, knowing the hassle and expense it would give you.

    I think I'd survive it. I have a P38, remember?

    1 hour ago, smallfry said:

    I am being asked to sell it at least once a month. Best offer yet has been £4000.

    Even crusty ones seem to be going for more than that.

    P38 winch bumper build

    in Tools and Fabrication

    Posted

    3 hours ago, Ed Poore said:

    What was the final weight in the end? I know mild is just over the £1k/tonne here but if it's an offcut paid for by another job then it's just profit. 

    I'd need to check, but I think overall around 34kg?

    The other place I got a quote from always counts full plates, and could only do S235. They quoted €1.89/kg for 3mm and €1.82/kg for 5mm plate.

    The place I ordered from now is probably so cheap because it's an offcut. Not sure how he deals with it, but I'm guessing the 3mm stuff was all from the same plate, as the price barely increased when I added the skidplate that I had forgotten to send in at first. And that price increase was for the extra bend I think :)

    • Like 1

    P38 winch bumper build

    in Tools and Fabrication

    Posted

    Order is in with the local lasering guy. The 5mm bits will be S355, the 3mm bits S235. Cradle and skidplate bent by the lasering guy, the curved plate I'll attempt to do myself. €280 ex VAT, can't complain about that.

    Now hope it fits :D

     

    • Like 4

    CAD programs

    in Tools and Fabrication

    Posted

    Thanks for all the suggestions, everyone.

    For the bumper build I decided to stick with Fusion 360, and trying to learn the tips & tricks. It looks like it takes a bit of a different approach, but once you get that approach down it isn't too bad.
    It seems much more reliant on defining lots of planes and separate components. I'm still annoyed that you can create a lofted sheetmetal part, but it just throws errors when you try to create a flat pattern...

    I signed up for the Solidworks trial, and played around with it for a few minutes. The sketching is a million times better, as I remember it. But assemblies are just as much of a mess, really. And it was running in an online VM, so not quite the same user experience as having it locally.

    On 5/5/2023 at 8:07 AM, Ed Poore said:

    I remember discussing with the chap who was our main CAD guy (he ironically also came from Autodesk) and at the time there were things back then that Inventor had been doing for years that Solidworks still couldn't do. The one that sprung to mind was translational constraints (at least that's what I called them). For example I could model a hydraulic cylinder, model a digger using that cylinder and then directly whilst editing the model move the boom and so on with it being constrained by the hydraulic rams.

    Yeah, the joints in Fusion are powerful, but a right pain to set up (for me, anyway). It always tries to do exactly the opposite of what I want it to do, for some reason...

    P38 winch bumper build

    in Tools and Fabrication

    Posted

    7 hours ago, geoffbeaumont said:

    Crumple zones? On a P38...?

    It has crush mounts behind the stock bumper. That's about it.

    1 hour ago, ped said:

    If i were to fab it from scratch i could inc to the main mountings for the winch to 8mm but then skeletonize much if it reducing weight but still keeping the strength

    I mostly wonder why the 8mm. Especially if there's barely any twist in the system when mounting the winch feet-forward. 5mm, especially in a U-channel, should be more than plenty strong.

    Remember: as I have it now, it'll be a 5mm U, with 3mm plate welded top and bottom of the U. I don't think it'll move.

    Hence my initial design brief: try to make it strong without just throwing heavy plate at it.

    7 hours ago, ped said:

    fair enough each to their own but why spend all the effort making something not strong enough in the first place stronger when you can start with something that is already strong and will do the job without all the extra faffing about,unless you just like faffing for the sake of it

    In that line of thinking I could just do a Nige and make everything out of 10mm plate. I'd rather "faff about" and try to find an optimal design. This is not a winch challenge truck either, the goal is mainly self recovery and maybe some marshalling-type stuff.

    I'll try and get some drawings sent out to get stuff cut out. Would be nice to get it in by Seven Sisters, but we'll see. That's not far away and I've got a lot to do...

    • Like 1
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