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Like a carpenter bringing a level to a ship remodel? His solution works unless I missed something.Well done . Now bring in a plumb bob .

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Clamps....clamps.....clamps

If Imelda Marcos can collect shoes, we can collect clamps, rulers and square of all types.

The contraption shown is powerful and costs very little. The "contraption" coupled with imagination makes cabinetry placement accurate.

Spring clamps are simple and inexpensive helpers. I use them a lot. The drywall T square is fine away from the wall but a second one with short T leg cut off will allow you to get close to the van wall.

ClampsClamps....clamps.....clamps

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Funny, just a framing sq was I used or needed🤔

I prefer just a tape measure and calculator. ¯\Funny, just a framing sq was I used or needed🤔

Worked fine for the lowers, we'll see about uppers.

My first thought every time I hear the word.

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34 Posts

Plumb bob only works if your parked on a level street. 🤦♀️Well done . Now bring in a plumb bob .

Yup. Walls and ceiling are arcs of a circle with radius about 10 feet.These van look square but they're round .

And you have an even load so there is no tilt.Plumb bob only works if your parked on a level street. 🤦♀️

Geometric proof required for full credit.Yup. Walls and ceiling are arcs of a circle with radius about 10 feet.

I'm getting ~30 ft radius for the roof from my rough CAD drawing based on height in center and at edges.Yup. Walls and ceiling are arcs of a circle with radius about 10 feet.

Distance from floor plywood to bottom of rib is 74.75" at the center and 73.6" at the edges. The edges are 30" from the center. See below diagram. This is not a rigorous proof.Geometric proof required for full credit.

Arc xy = arc yz, therefore by secant angle theorem, angle A = angle C

Angle A = arctan(1.15/30) = 2.195 degrees

Angle B = 90-A-C = 90-2A = 85.61 degrees

radius r = 30/cos(B) = 392

392 inches = 32.7 ft

And that's for our PMs. I pity the poor Sprinter owners; their vans are like eggs by comparison.These van look square but they're round .

But I have to get back to work!Aaron, I accept your calculations. Mine was the best I could do on the den floor. It is subtle enough that an edge cut to that arc looks like the board is warped.

Now please verify (or not) that the walls have the same.

I have the walls modeled in AutoCAD as vertical up to the waist-height ribs, then a straight line at an angle of about 6.4 degrees up to the roof. I probably just measured the width somewhere near the roof and approximated it as a straight line in my CAD.

I just drew an arc tangent to the lower part and intersecting the upper, AutoCAD shows a ~16 ft radius.

But I think it's fairly straight until the upper horizontal rib, and then curves in more at the top. All my polyiso panels on the walls went on pretty flat, while the roof required several break points to get them glued on tight.

My cross section is pretty crude:

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