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Tuesday, July 12, 2011

Unexpected Quantities in Schedules... - RT @RevitClinic

No one said there'd be math. Someday the 2D year olds will discover the importance of having the ability to provide an "Accurate" not an "Estimate" as to the cost of a building. I think it's pathetic how much time is wasted on contractors having to decipher lineweights to determine what the heck it is they're counting and measuring. It's like doing spellcheck on a typewriter. Who needs such a manual and tedious process and what are you doing to make these problems go away?

Of course, it's always someone else's problem, not in the budget, we're not getting paid to do that and the contractors will figure it out. Well, the contractors have figured out how to become design/builders and bypass the source of the problem, those darned hatch patterns and silly lines manually drafted on a black screen.

Randy, if you're reading this, we'll continue this conversation next week in Chicago.

Source: http://revitclinic.typepad.com/my_weblog/2011/07/unexpected-quantities-in-schedules.html

Here's another great post from fellow Autodesk Support Specialist Chris Aquino - thanks Chris!

Recently I had a few cases where the quantities in Parts (and Wall) schedules show unexpected amounts. During my research, I made a few of these schedules and saw the same results. At first I confused (I was petrified) as the numbers were not jiving. But I said to myself "You were a Mathematics major for two years, you should be able to figure this out!"

Sched_01

After a little bit of futzing around (with some help from the Revit UI), I was able to figure it out. Basically, if you measure the full width of a box with walls 3 inches thick in two directions, then count the volume, the volume of the material (3 inches) at the corners would be counted twice.

Sched_02

What Revit does is that it uses the average dimension between the shortest dimension and the longest dimension in the formula to calculate the area. Or in cases of 90 degree corners, it takes the full width minus half the width of both corners. The new way that 2012 displays highlighted elements really shows this:

Sched_03
Sched_04

The math breaks down as such:

Brick (outer layer):

21'- (1.5" x 2) = 20'-9" (where 1.5" is half the thickness of the brick)

20'-9"= 20.75'

20.75' x 10' – 207.5' sqft.

3" = .25'

207.5' x .25' = 51.875 cuft.

Click here for a video showing the math and results.



Unexpected Quantities in Schedules... - The Revit Clinic



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