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BIM objects, metadata and model coordination · Lesson 3 of 4

BIM objects, metadata and model coordination: methods and worked application

A seven-step method from a received model to a checked job packet, worked through on a 186 ft coping run: units and piece counts, the coping girth against AFS limits, dimension ownership, clash and clearance checks, and the question to ask when two numbers disagree.

You will be able to: Apply a seven-step method to a model of a parapet coping: identify the file, read the unit and properties, attribute each dimension, check AFS limits, run a clearance check, raise questions and record the packet.

13 min · 12 slides · 9 questions

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Slide 1 of 12

The seven-step method

The method has seven steps: identify the file, read the unit, read the elements, tie each dimension to its owner, check AFS limits, coordinate, and record the packet.

Each step has one question: what is it, in what unit, what does it say, whose number is it, can AFS make it, what touches it, and who can check it?

From a received model to a checked job packetSeven steps from top to bottom: A identify the file by its contents, with a branch for a Revit file, which is exported to IFC, DWG or PDF first; B read the unit and schema; C read each element and its property sets; D tie every dimension to its owner; E check AFS limits, with a branch to AFS shop review if over a limit; F coordinate with clash, clearance and questions; G record the packet. AFS confirms every profile before fabrication.From a received model to a checked packetIdentify the file byits contentsARevit file?Ask for IFC,DWG or PDFRead the unit andthe schemaBRead each elementand its property setsCTie every dimensionto its ownerDCheck AFS limits:girth, piece, hemEOver a limit?Raise with AFSshop reviewCoordinate: clash,clearance, questionsFRecord the packetGAFS confirms everyprofile before fabrication

Seven steps top to bottom, lettered A to G: identify the file by its contents, read the unit and schema, read each element and its property sets, tie every dimension to its owner, check AFS limits, coordinate, record the packet. A Revit file branches off step A to an export request; a profile over a limit branches off step E to AFS shop review. AFS confirms every profile before fabrication.

A
Identify the file by its contents
B
Read the unit and the schema
C
Read each element and its property sets
D
Tie every dimension to its owner
E
Check AFS limits: girth, piece length, hem
F
Coordinate: clash, clearance and questions
G
Record the packet
The method of this lesson. The two amber branches are gates: a Revit file, which AFS does not read directly, is exported first, and a profile over an AFS limit goes to shop review. AFS confirms every profile before fabrication.

Glossary

Girth
A profile's total flat width including its hems; AFS's maximum is 48 in.
Clash test
A check in coordination software for elements that intersect or sit too close; Navisworks offers Hard and Clearance tests among others.
Clearance test
In Navisworks, a test that finds geometry within a specific distance of other geometry.
Request for information
A written question to the design team, used when two numbers in a model disagree or one is missing.
Fit allowance
The 1/2 in added to a wall width for a coping in the Drexel Snap Coping guide rule that AFS's coping tool records.
Hem allowance
AFS's quoting simplification: a smashed hem adds twice its fold length to the flat width.