Arjan Posted June 1, 2021 Share Posted June 1, 2021 That looks very, very nice ! 1 Quote Link to comment Share on other sites More sharing options...
Blanco Posted June 1, 2021 Share Posted June 1, 2021 4 hours ago, uninformed said: New cross member... On the strength of that I'd be tempted to ask you to do me one! ............ not practical...... but it does look good. 1 Quote Link to comment Share on other sites More sharing options...
Anderzander Posted June 1, 2021 Share Posted June 1, 2021 That plating looks fantastic ! 1 Quote Link to comment Share on other sites More sharing options...
uninformed Posted June 2, 2021 Author Share Posted June 2, 2021 9 hours ago, Blanco said: On the strength of that I'd be tempted to ask you to do me one! ............ not practical...... but it does look good. Shipping would be ridiculous 😆😆 Quote Link to comment Share on other sites More sharing options...
uninformed Posted July 17, 2021 Author Share Posted July 17, 2021 I got my recovery lugs welded up, bit ahead of myself there lol, but they came with the laser cuttings for the new rear crossmember and the radius arm infills. im also working on another gearbox crossmember, I wasn’t 100% happy with the other one, but will see how this one turns out 🤷🏻♂️ recovery eye is 20mm plate, mounting plate is 10mm. 2 passes at 180 amps. 3 Quote Link to comment Share on other sites More sharing options...
miketomcat Posted July 17, 2021 Share Posted July 17, 2021 They look beautiful and I'm sure they are more than strong enough, just welded recovery points make me uncomfortable. Please don't get me wrong I would use yours. When I made a recovery point for the ibex I used 10mm angle with webs and additional thickness welded on so the bolts went through the same bit of metal the load did. Mike 1 Quote Link to comment Share on other sites More sharing options...
Blanco Posted July 17, 2021 Share Posted July 17, 2021 Sweet! ...... We used to pay £££'s for pad-eyes to get designed, welded up and NDT'd for lifting stuff offshore but I never saw any that neatly executed. 1 Quote Link to comment Share on other sites More sharing options...
landroversforever Posted July 17, 2021 Share Posted July 17, 2021 Are they notched into the base plate and welded on the back too? 2 Quote Link to comment Share on other sites More sharing options...
uninformed Posted July 18, 2021 Author Share Posted July 18, 2021 (edited) @Blanco Im guessing those would be 'stick' welded. While 'stick' doesnt get the hype or glamor of 'Tig' there is nothing wrong with it in the right hands. The range of rods available and its ability to be welded in all conditions make it still the go to in many critical applications. I have only done it a few times, but have a great appreciation of it. @miketomcat @landroversforever I understand the hesitation regarding welded recovery lugs. The way I see it there are many critical components on our LRs that are welded and see high cyclic loads (fatigue) and we dont give them a second thought. While there is some "controlled enviroment" they certainly are not 'NASA' spec. For a welded joint such as my recovery lugs, the general rule of thumb is that since the it can have a full fillet weld right around the lug to mounting plate, the fillet weld size (leg length) should be a minimum of 0.75 the thinner of the two materials. In other words, the weld will equal/exceed the strength of the mounting plate. Another view point (may or may not be moot) if we look at the volume of the 3.2tonne bow shackle pin that is in sheer, it has a 19mm dia pin, 20mm in the lug. Thats 5670mm3. The fillet weld (that is in tension) at 7.5mm leg length has a volume of 9281mm3 These recovery lugs are to always be used with a bridle (both lugs used at any recovery) So no, no notch etc, only the fillet weld you see. Edited July 18, 2021 by uninformed 2 Quote Link to comment Share on other sites More sharing options...
miketomcat Posted July 18, 2021 Share Posted July 18, 2021 It's not that I don't trust your welds quite the contrary, yours are far better than mine. I guess I've seen welds that look perfect fail, so for me I need proof they're good (coded welder, rated/tested) that's all. Mike 1 Quote Link to comment Share on other sites More sharing options...
Tim_NZ Posted July 18, 2021 Share Posted July 18, 2021 Beautiful fabrication! Love your work, thanks for posting it up. 1 Quote Link to comment Share on other sites More sharing options...
missingsid Posted July 19, 2021 Share Posted July 19, 2021 Beautiful work but the design ro me looks better suited to a tail gate hinge than a recovery point? Doesn't the offset hole put the stress in a peeling down direction? As I am NOT an engineer I have no idea what it's physical abilities actually are though. Quote Link to comment Share on other sites More sharing options...
Dr Strangeglove Posted July 19, 2021 Share Posted July 19, 2021 6 minutes ago, missingsid said: Doesn't the offset hole put the stress in a peeling down direction? As I am NOT an engineer I have no idea what it's physical abilities actually are though. I don't know where these will be mounted or used, but the"peeling" action you mention would depend on how they are mounted. Will these be mounted as shown, so mounted on top of something, as if they are that looks like a good design. I can understand the "peeling" action if mounted vertically with the hole at the top or bottom. Lovely looking welds - so neat I thought they looked Tig welded! Quote Link to comment Share on other sites More sharing options...
uninformed Posted July 19, 2021 Author Share Posted July 19, 2021 @missingsid @Dr Strangeglove they have the mounting plate in the vertical plane, recovery lug in the horizontal plane, shackle hole is vertical. The hole is offset so the resultant force line continues through to the centroid of the chassis rail/crossmember attachment. The welds are mostly in tension, the only bending moment would be any vertical change in height of the recovery line ( but generally very little) The welds are TIG, as with all my work on this build. 1 Quote Link to comment Share on other sites More sharing options...
bishbosh Posted July 19, 2021 Share Posted July 19, 2021 On 7/18/2021 at 2:02 AM, uninformed said: Another view point (may or may not be moot) if we look at the volume of the 3.2tonne bow shackle pin that is in sheer, it has a 19mm dia pin, 20mm in the lug. Thats 5670mm3. The fillet weld (that is in tension) at 7.5mm leg length has a volume of 9281mm3 T Just to correct this point - the volume of the shackle pin in the plate is not what you are interested in and offers absolutely no insight into the strength of the connection. From a pin perspective, you are interested in the two shear planes where the pin exits the face of the plate. The shear area (assuming no threads in the shear planes) is 19^2 PI/4 x 2 = 567mm2. You would then go on to calculate the shear capacity of the pin based on its yield strength, the bearing capacity of the plate, the capacity of the weld group and also potentially the tensile capacity of the weakest section of the plate. this will identify the weakest link. I wont bore you here with those numbers. Another comment is that the configuration of the weld group will also be a factor in the strength of the connection - you cannot just compare sizes (ooo-err missus) and assume all will be well. Also, depending on the direction of the load, the weld will be in a combination of shear and tension / compression, not just tension. Welded recovery points are absolutely fine if, and only if, they are appropriately designed and competently fabricated. (this is not a pop at the OP, just a statement of fact). Lots of love, Bish CEng MICE. 2 1 Quote Link to comment Share on other sites More sharing options...
uninformed Posted July 19, 2021 Author Share Posted July 19, 2021 @bishbosh feel free to bore me 👍 20mm plate was chosen as it’s the max thickness that comfortably fits the 3.2Tonne shackles I use. 10mm mounting plate was gut, 4x1/2” bolts because that’s good enough for a pintle should be fine for two combined recovery points. 0.75 weld size rule was given to me by a engineer. Hopefully with good practice the welds will be mostly in tension. I don’t compete so set up time is not a real issue. Quote Link to comment Share on other sites More sharing options...
uninformed Posted August 28, 2021 Author Share Posted August 28, 2021 Finally finished the radius arms. But still have to install bushes, check fitment and axle alignment AND pass inspection. I probably should finish building my press too 😬🤦🏻♂️ 2 Quote Link to comment Share on other sites More sharing options...
Stellaghost Posted August 28, 2021 Share Posted August 28, 2021 Curious, did you scrap the previous ones, asking because the welding around the bush section does not look as uniform as the previous ones you posted, nice work though regards Stephen Quote Link to comment Share on other sites More sharing options...
uninformed Posted August 28, 2021 Author Share Posted August 28, 2021 34 minutes ago, Stellaghost said: Curious, did you scrap the previous ones, asking because the welding around the bush section does not look as uniform as the previous ones you posted, nice work though regards Stephen No. that’s a added 4mm infill plate (both sides) over the top of the main webs. Looks worse than it is because I gave a quick sand and it highlights the highs/lows due to the heat discolouration left in the lows. But it is also not as pretty as the main web passes. Pre heat and no peddle makes it a little more tricky. They will do the job though. Quote Link to comment Share on other sites More sharing options...
Stellaghost Posted August 28, 2021 Share Posted August 28, 2021 1 hour ago, uninformed said: They will do the job though. I'm sure they will regards Stephen Quote Link to comment Share on other sites More sharing options...
uninformed Posted August 29, 2021 Author Share Posted August 29, 2021 A little bit of Sunday work. Quote Link to comment Share on other sites More sharing options...
Anderzander Posted August 29, 2021 Share Posted August 29, 2021 You’re up and at it early ! 🙂 Quote Link to comment Share on other sites More sharing options...
Peaklander Posted August 29, 2021 Share Posted August 29, 2021 23 minutes ago, Anderzander said: You’re up and at it early ! 🙂 Time zone 😀 1 Quote Link to comment Share on other sites More sharing options...
Anderzander Posted August 29, 2021 Share Posted August 29, 2021 Phew - I feel far less of a slob now 😮💨 2 Quote Link to comment Share on other sites More sharing options...
uninformed Posted August 31, 2021 Author Share Posted August 31, 2021 Got the Nissan bushes pressed in (really need to build mine) and bolted the arms and housing up. Castor and pinion are on point. 3 degrees at ride height and pinion is spot on for the double Cardin shaft. still lots of clearance checking to do and double check. 1 Quote Link to comment Share on other sites More sharing options...
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