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After work I thought I would go mock up the roll bar in order to calculate the rear braces. Then realised that the seats need to be in to get the spacing and angles right, and that would result in the braces and top support being in tje right position. Bloody hell, it took forever to get all the bolts n nuts fitted and fixed down. I also added the second lap strap on the drivers side to the seat, bolting it to the original seatbelt mount.   Once the seats were in, and tested, and passed on QC, the next was to add in the CAD piece behind the eat. Followed by the rear brace which mounts at the same level as the shoulder harness mounting brace. I wanted them to be as unobtrusive as possible. Success. It then mounts int the chassis through the rear chassis mounting plates.  If I manage to get the pipe bends right, this could work OK. Next will be making up a CAD profiles for the braces. Fingers crossed of course. |
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Also important is to keep in mind the amount the metal moves when you bend it in the hydraulic press. Pretty chuffed with this tonight. Hi Rian Good work so far, enjoyable to see the progress. Maybe you know this already but anyway here it is, on your blue CAD backboard, layout the roll bar with the correct dimensions, ie the outside diameter as well as the centerline of the pipe. Now take your measurements from the centreline of the pipe to get the correct measurements as that line does not move when you are bending the pipe. Keep it up. |
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Also important is to keep in mind the amount the metal moves when you bend it in the hydraulic press. Pretty chuffed with this tonight. Hi Rian Good work so far, enjoyable to see the progress. Maybe you know this already but anyway here it is, on your blue CAD backboard, layout the roll bar with the correct dimensions, ie the outside diameter as well as the centerline of the pipe. Now take your measurements from the centreline of the pipe to get the correct measurements as that line does not move when you are bending the pipe. Keep it up. Evening Eugene. Thanks , I have marked the pipe in advance, but will check bend by bend, as the metal does move. Starting from the centre. |
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More parts to the puzzle ordered in £54.00 from Evilbay. Hope the drivers side fits in.   And rather than collecting on Saturday morning, delivery of a 4.2 meter and two lengths of 1.2 meters of pipe, to add to mine. Also realised that the rear braces need to be different to create the right look.  Can you see the rear brace?  I am really liking that. More on Saturday. |
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misteralz
Posted a lot
I may drive a Volkswagen, but I'm scene tax exempt!
Posts: 2,485
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No. That brace needs to be much higher on the rollover hoop otherwise it will fold in a rollover situation!
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As above.
You need to think triangles: the brace starts at the top of the bar, and goes to the chassis at the back. That's enough to stop the top moving, and you then add a shorter piece from the bottom of the main hoop to the middle of the brace.
This is all essential, as the pipe you're using isn't really meant for this sort of structural part.
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Jun 10, 2022 11:50:59 GMT
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It's only a show cage, he's not doing the Paris Dakar rally.
If you want to get into details then harnesses shouldn't be used with those seats but I'm sure it'll be reet
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Jun 10, 2022 13:23:47 GMT
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It's only a show cage, he's not doing the Paris Dakar rally. If you want to get into details then harnesses shouldn't be used with those seats but I'm sure it'll be reet These aren't details, but basic structural principles. As shown, the support doesn't do much to locate the lower part of the hoop and nothing for the top. Even if you class the hoop as just the seatbelt mount, it's not enough. When yo add in the less than ideal material and bending equipment the design is inadequate and potentially dangerous if actually used to support any weight. |
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Like the wee wooden wagon.
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Like the wee wooden wagon. Morning Igor, Thank you. Great for a skip find, it regularly works hard. Can carry 4 x 16” alloys with tyres at a time. Beats rolling them about. |
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Just bent a pair of braces before coffee and toast with Sally this morning. Cross brace cutting next, then make it all fit by cutting the curved shapes where they all join, grind back all the galvanising so I can stick weld them together and tack onto the base plates after I make the rear base mounting plates plates and weld in a pair of captive bolts so they all can slip fit together and be bolted down in one, once full welded up. .  Fingers crossed. |
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Jun 11, 2022 21:00:43 GMT
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Long day. Made the rear chassis mounting plates for the supports.   Then made some “fish mouth” or whatever you call them, joins.  Mocked up.  Chassis mounting plates welded on the braces.  Mounted in the cab, roll hoop in place, on its base plates…… For the anal amongst us, zoom in, knock yourself out.  Carrying on, later, around 5.00pm John the lodger joined me, both to help and give advice. Then Mickey came around. They sat chatting, discussing South London, where they both grew up, a lifetime ago. Mickey had to point out the joins being very good.  A load of preparation and grinding to make the joins work.  Lots of tacking in place, removing and stick welding.    Getting there, bit by bit. .  Happy  Done. Paint in the morning. FIA approved………  Cheese and crackers for dinner. A serious rum, after a tall beer. Tired tonight. Rewarded  Bootfair in the morning, if I wake in time.. |
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Last Edit: Jun 11, 2022 21:05:06 GMT by grizz
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Jun 11, 2022 22:00:56 GMT
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Fia approved that’s good enough for me😉
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Fraud owners club member
2003 W211 Mercedes E class
1989 Sierra sapphire
1998 ex bt fiesta van
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He thought he could so he did; and now nothing can be withheld from him...
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Jun 12, 2022 10:47:07 GMT
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well the pic says it all  well done  and a great sunset to finish off  |
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Jun 12, 2022 18:35:25 GMT
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Well done mate,
That looks superb,
Not long now,
Nigel
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BMW E39 525i Sport
BMW E46 320d Sport Touring (now sold on.)
BMW E30 325 Touring (now sold on.)
BMW E30 320 Cabriolet (Project car - currently for sale.)
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Jun 12, 2022 20:40:41 GMT
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Fia approved that’s good enough for me😉 Of course you know what FIA stands for. Had no choice. He thought he could so he did; and now nothing can be withheld from him... Thank you very much. well the pic says it all well done Happy that it was completed for sure. and a great sunset to finish off Bonus balls. Well done mate, That looks superb, Not long now, Nigel Thank you Nigel. Good to chat this morning. Thanks for listening. |
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Jun 12, 2022 22:00:19 GMT
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Anytime Rian,
I enjoyed our chat,
Nigel
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BMW E39 525i Sport
BMW E46 320d Sport Touring (now sold on.)
BMW E30 325 Touring (now sold on.)
BMW E30 320 Cabriolet (Project car - currently for sale.)
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Anytime Rian, I enjoyed our chat, Nigel You have a load of wisdom, and I enjoy it, you always make me chuckle too. Certainly a hot week forecast. No shirt weather. Enjoy |
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