LIVE #5: Let's talk about... SUBFRAME 

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Done !;)

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Any type of spring mount is not torsion free because you need forces to compress the springs. When you get twist in the chassis frame, the upper frame will follow that movement more or less, whatever the springs allow in travel. The result is: The upper frame will still twist at least a bit and so will the body - which is not good for the body. The upper frame will stiffen the whole package and will reduce the twist of the chassis frame - which is not good to keep the wheels on the ground. A spring mount system will not allow as much chassis twist. Once it comes to it´s mechanical limit, full forces will be transfered - not good at all. Spring mount systems as described are typically used for trucks with a tank. Those tanks are typically round and long, they don´t like to be twisted, but those tank trucks are used on normal roads, not in off-road.

Did yo work out that there is no oscillation to be dampened ?

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Hello Nelson, the idea of attaching fuel tanks and storage compartments to the body or the subframe is supported ! We do that since more than 25 years and appr. 20% of all UNICAT vehicles have it. If I remember right, the UM12-Fh was the first UNCAT vehicle with that system. Make sure your subframe is strong enough and make sure you leave sufficient space between the chassis rals and the fuel tanks, both parts still do a relative movement. Thomas UNCAT GmbH

Hi Thomas! Great!! I did not know that UNICAT adopted this system. As the subframe has not yet been made, it will be built in a way that supports the weight of the fuel tank and all compartments. I was happy for the tip, it was very important for me to know your opinion, thank you very much Master!

This was my question! I’m glade that we were not off base. It seems like it makes more sense, giving more clearance allowing for a more accurate and larger tank and compartments and becomes a more unified look. Nice! I wish I could get my wife on board!

Perfect, I would love to see

we cannot reveal all our "secrets" 😜😜

@@UNICATexpeditionvehicles ah yes I understand, would just love to see it working! Doesn't have to reveal how it works...

It would be great if we could put all the languages in, but unfortunately, it would also be too big a job ... Thanks to you for watching the video and, don't forget to subscribe to the channel

Find the answer to your question here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ya9j06IiTtY.html

UNICAT Expedition Vehicles thank you for the link. 😊 already watched it, missed it live by 1/2 an hour 🙈 it did indeed answer a few questions. I hope you do many more of these more technical sessions, a definite gold mine and I will probably have many more questions. 🤣👍🏼

We had bought one but it didn't work, we will improve this too.

Steel

Last question(s). I am building a camper for the back of my 2003 Stewart & Stevenson LMTV. I am building a 17 foot (518.16 centimeter) long by 8 foot (243.84cm) wide by 7 feet (213.36cm) tall camper. I was going to frame it with aluminum studs and gusset the frame. I was going to below it straight to an aluminum subframe built into the floor. I was going to use 6x3 with ⅛ wall tube for the subframe. The subframe is going to be 4 points. 1) Will aluminum work for the subframe, or should I stay away from aluminum for the subframe? 2) Do you have schematics, or suggestions on the exact location for the 4 point subframe mount as it relates to the location on the LMTV frame. This if based on the dimensions of the box I am building above. thank you again. Learning alot from your videos for my project.

I have the same plan ish in my mind for a m1088 in my mind of course! Need a few more ducks in a row and projects off the table first. But I’ve pondered and researched. Not that I have any experience. But as I gathered from uncat he seems to over engineer things including the capacity of the truck in regards to the weight. This seems to me a very sound MO. So you will need much more aluminum to equal steel in strength. I don’t know how to gage that but may be it’s not necessary with the ability of such a sturdy truck and its capacity? I’ve seen some four mount systems where the front swivel mount is just back of the transmission etc the rear swivel mount pretty much right at the back and the Center two mounts are just in front of the axle assembly but I think still where all the extra steel is that stiffens up the axle area where every thing spring and shock related attaches to the main frame. This way the forces on the rear of the truck readily transfer to the box with out added stresses to the main frame. This is the stronger more accurate place to allow the motion and force that must move to the box while the other swivel mounts allow free movement with out argument. That’s my useless opinion!! So hopefully now the master will tell us we’re this is true and or false!

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