[jbeez]

The idea is for everyone to chip in and contribute. A sort of an Opensource design. Even if you just end up using the dimensions.

Attached is a basic design and apart from the lenght everything else is plain guess work. Will get under the car with a tape measure and change the measurments accordingly.

Couple of questions:
1. How do you decide how many gussets you really need?
2. What size /spec bolts would you use to attach?
3. I have worked on an outer size of 50mmx50mm. Would you go bigger?
4. Anything else to be changed/added?
4.1 Highlift points in sliders, is it worth it?

Any suggestions are welcome and I will adjust the drawing accordingly. Done with Google Sketchup so you can download and play with.

Rockslider Square.zip

(45.35 KiB) Downloaded 153 times

To follow, Bashplates and bumpers

[CATS]

Looking good thus far. I would say go for the high lift jacking points while you are at it.

CATS

[4ePajero]

The rail chassis is designed to be loaded in the vertical plane, with minimal "twisting" moments.

Your design puts a lot of twisting moment on the chassis rails (at the points where the sliders are connected to the chassis).
Is there a way of transferring the load to both sides of the chassis?
If you add cross members at the connecting points, the two sliders are connected and the loading changes from twisting loads to vertical loads.

Draw both rails as well as the chassis rails and existing cross members, and we can look for a solution.

[jbeez]

Points added

High lift points added

[jbeez]

The rail chassis is designed to be loaded in the vertical plane, with minimal "twisting" moments.

Your design puts a lot of twisting moment on the chassis rails (at the points where the sliders are connected to the chassis).
Copied the mounting points from the attached design. Will have to get under the car and finalize

Is there a way of transferring the load to both sides of the chassis?
If you add cross members at the connecting points, the two sliders are connected and the loading changes from twisting loads to vertical loads.
Will have to look and see if something is not in the way. Would not like to have the crossmember lower than the chassis
I have had a look at all the example if have collected and the only difference being welded of bolted onto the chassis. No-one else uses a cross member

Draw both rails as well as the chassis rails and existing cross members, and we can look for a solution.
Will do later

[Fielies]

im looking at the same thing but wanna use 67mm round bar. wanna use it as ford uses theirs. will they still do the same function or do u have to use double sq tubing?

[jbeez]

im looking at the same thing but wanna use 67mm round bar. wanna use it as ford uses theirs. will they still do the same function or do u have to use double sq tubing?

Square tubing is just easier to work with. I tried to keep the design as such that you do not need benders,ect to build it. So far I can get it done using a grinder, drill and welder.

[jbeez]

**UPDATE**

With Gerhard's comments regarding the crossmember in mind I took my chance to have a good look while the car was on a lift this morning.

In the front there is a crossmember bolted onto the chassis with four bolts. I reckon if you use longer bolts, this can also become a mounting point.

The attachment DSC_0164.jpg is no longer available

Thus I have changed the front mounting to look like this (NOT ON SCALE)

Missing Attachment

The rear will have to be done the original way as planned. There is no way you will be able to get a crossmember in. There is another crossmembr in the middle which can be used in the same way as for the front mount. With 2 out of 3 it should be able to take the load.

I someone wants a copy of the Sketchup file you can send me a PM

[4ePikanini]

I would seriously consider reinforcing these points as they will have a lot of leverage.

[jbeez]

I would seriously consider reinforcing these points as they will have a lot of leverage.
]

If I add a third leg, will this not be better? Trying to keep the underside as smooth as possible

BTW, thanx for the input hope that someone else will benefit from this as well