2D-Drawing to ProE

8/22/2019 2D-Drawing to ProE

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Elite Consulting Ltd. 2002

Re-use of 2D Geometry in

Pro/Engineer Models

Elite Consulting Ltd.

Phil Austin


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Company

Engineering Consultancy in UK (Northampton,

Leeds & Linlithgow)

Long-Time Mechanica Users (Longer than PTC)

CEPs, Structure & Motion

Specialise in Mechanica-based FE

and Dynamics Consultancy

General Engineering Problem Solving Design andProject Management


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Introduction

2D CAD will continue to be used, despite the increasedavailability of 3D modelling

Occasionally - data is in 2D drawing form and we need to

construct a model from it. 2 options

1. Read the drawing, and build a Pro/Engineer model from

scratch.2. Try to use the 2D geometry to build the model


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Some questions you might ask yourself..

How difficult would it be to build a new Pro/Engineer Model?

How much time would be spent transferring data from thedrawing? (Starting from scratch might be faster than

trying to recycle )

What level of quality would the model require? would it

need to be fully parametric and correctly constructed.

Is the geometry in the drawing accurate? Does it need to be

accurate?

To Re-use 2D Data or Not to Re-use?


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Recycling 2D Data

Wanted a device that takes 2D drawings and producesPro/E models automatically.


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Why No Automation?

Drawings contain encoded 3D data that has to be interpretedby the readerwe to learn how to read drawings.

The reader usually has to visually scan the drawing to extract

information. Can be a complex process for complex parts.

Recycling 2D data requires -

Read the drawing

Extract selected data from drawing

Use 2D data to build 3D model


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Importing Geometry

As an alternative to drawing geometry in Sketcher, Pro/Engineer allowsus to import geometry from an external source

Autocad drawing (DWG), DXF file, IGES file, Pro/Engineer sketch.

When importing geometry into a sketch, Pro/Engineer allows us toview a complete imported drawing and select from it the geometry

that we want to use.

We can import geometry ---

Directly into a solid / cut features sketch using Data from File

Into a Sketched Datum Curve sketch using Data from File

Directly into a Datum Curve, using From File



Transferring Data Feature by Feature

The 2D drawing needs to be examined and the best method ofconstructing the model determined.

The geometry geometry that is used for each sketch needs to be

determined.

For a complex model, it might not be possible to construct all of the

features using imported geometry.

The model might need to be completed manually, creating features by

sketching the sections, specifying locations for fillet radii, etc.



Transferring Complete Views

As an alternative to importing geometry separately into each sketchedfeature, complete views could be imported for use later.

Sketched Datum Curves could be created from the imported geometry

using the Data From File option.

The datum curves would be used by selecting the particular ones that

are needed for each sketched profile.

They could also be used to define the depth, or length, of a feature.



Transferring Complete Views

As an alternative to importing geometry separately into each sketchedfeature, complete views could be imported for use later.

Datum Curves could be created directly from the imported geometry

using the From File option.These will need coordinate systems to be created in the correct

locations, with the correct orientations, beforehand.

These will create Import Features, and wont have any dimensions.

The datum curves would be used by selecting the particular ones that

are needed for each sketched profile.

They could also be used to define the depth, or length, of a feature.



Dimensioning Imported Geometry

Intent Manager automatically adds weak dimensions to the importedgeometry when creating sketched features

The original dimensioning scheme on the imported drawing is lost in

the process.

The geometry can be scaled, rotated, and translated.

After importing, the geometry could be re-dimensioned correctly.

For a quick model, the automatically produced dimensions could be

kept.



Drawing from Imported Geometry

If the sketches that were created using imported geometry were

dimensioned automatically by Sketcher it is unlikely that the

dimensions will be useful for the drawing.

If a drawing is to be produced from the imported geometry it is

probably best to dimension the sketches.



2D drawing to Solid Model by Importing

Geometry into Sketched Curves

Example 1



Create a new part using standard template

Create a Sketched Datum Curve

Select suitable sketch and reference

planesSelect Sketch > Data From File

Open the drawing (.dwg in this example) file

Pro/E issues a warning Click Select to select entities



The whole drawing is displayed.

Zoom in, and select

the geometry for the

sketch


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The geometry, as it originally

appears in the sketch.

Dimension the sketch

to the model.


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Modify dimensions to zero to pull sketch into place.


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Align the sketch to the model to remove the zero dimensions


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Dimension the sketch.


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The first datum curve is complete


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Second datum curve added


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Adding the fourth datum curve. The sketch plane is created on

the fly through one of the existing datum curves.


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Fifth datum curve is created


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Create the first solid protrusion using a datum curve

Use Loop

Extrude UpToCurve


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The first protrusion completed


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Second protrusion: usingcurve, loop, depth = thru next


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Third protrusion: using curve, loop, depth = thru next


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Add rounds. Shell model out.

Geometry for thesefeatures is created

manually because

they dont have

sketches.


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Continue adding features to complete the model.

The model can beparametrically

modified by

modifying the

dimensions of the

datum curves.


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More difficult to use

geometry from views.

Surfaces and vertices

are needed to construct

a Pro/E model withoutrounds and drafts.

The surfaces and vertices dont

exist in the drawing

Example 2 - Drafts and Rounds


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Sketched curves created from imported geometry, as before.

Datum points created at

theoretical vertices for

defining depths.


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Sketch points created at theoretical vertices, and used to

align sketched sections to.


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Depth of extrusion defined by using Up To Point option


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Model shelled out

Drafts added

Rounds added


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Example 3 - Non-Orthogonal Views

Drawing contains non-orthogonal views


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Non-Orthogonal Views

Note the angle of rotationthat is needed.

Create a datum plane on

the fly, thru edge, for

sketch plane.

Rotate imported geometry

to the correct angle.

Dimension, align etc.


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Imported Curves

Increase file size and regeneration time.

Delete if not needed.

Re-create using Pro/E arcs in possible.

C G


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Cleaned up Geometry

Geometry partially

cleaned up.

Redundant curves

removed.

Makes model more

lightweight

S lid F C i


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Solid Feature Creation

Alternative constructionmethods -

Build more flexible

model using individual

features,

Or

Build quick model using

profiles to contain asmany features as

possible

Example 4 DWG File to Pro/Engineer


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Example 4 - DWG File to Pro/Engineer

Assembly Model, using Skeleton

O th d fil i P /E i S l t M d l S


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Open the .dwg file in Pro/Engineer. Select Model Space.

Dont scale to fit format. Place in lower left hand corner.

(drawing frame)

Blank unwanted detail using layers if possible


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Blank unwanted detail using layers if possible.

Delete unwanted detail that wont blank.


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Delete all views except the one to be transferred into the model

Translate the view to the sheetsorigin.

Pick up a vertex on the view (may

need to create this first)

Translate using Abs Coords to 0,0

Save the drawing

to an IGES file


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Alternative method using Isolate Layer

Create layers for each of the views Plan, Left, Front,Section1

Put each views geometry onto its own layer -

Add Items > 2D Items > Pick Many

Use Isolate to display one view at a timeTranslate view down to the drawings origin

Save to IGES, with name same as view for easy I.D.

Repeat for all other views

Create a new assembly model Create a skeleton part


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Create a new assembly model. Create a skeleton part.

Modify the skeleton, adding a coordinate system to it.

XY

The location and orientation of thecoordinate system are used to locate and

orient the IGES geometry created

previously.

Modify the skeleton part Create a Datum Curve From File


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Modify the skeleton part. Create a Datum Curve, From File.

Select the Coordinate system and the IGES file.

Create IGES files and datum curves for remaining views.


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g

Each view needs to be translated to 0,0 on the drawing

before exporting.

Each view needs a coordinate system to be set up in theskeleton part, with the correct location and orientation.

Create parts in the assembly Use Copy Geom to copy selected


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Create parts in the assembly. Use Copy Geom to copy selected

curves from the skeleton model into each part.

Open the parts, and create solid geometry using the curves when

sketching sections and defining depths.


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Making the model Parametric

Sections created using Use Edge have no

dimensions inherit their geometry from

underlying curves.

Parent curves have no dimensions they arean Import Feature.

Redefine the features section, edit the

Sketcher References, and delete those

that tie the sketch to the curves.

M ki th d l P t i


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Intent Manager auto-dimensions thesection to replace the missing refs.

Add new dimensions and modify.

The importedcurves will contain

splines instead of

arcs.

Delete these, andreplace with

sketched arcs.

M ki th d l P t i


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Add new dimensions and sketchconstraints, and modify.


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Summary

No automatic method for converting drawings into models.

Methods exist for transferring 2D data into Pro/Engineer models.

Importing 2D geometry might not be the best option.

Dont expect 100% transfer rate.

Important to decide how models built from imported geometry will be

used, before building them.

How the model will be used will influence how well the model isconstructed, and its flexibility.

Part and assembly geometry can be imported into Pro/Engineer.

The drawing geometry might not be accurate, but Pro/E could correct it.


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Stop Press

SnOOpy will be introduced very soon!!!

Utility will semi-automate the process of transferring data from 2D drawings to 3D

models.

Will be possible to select geometry directly from the drawing when creating

features.

For more information, contact Mark Lobo

Pro/ENGINEER Product Management

PTC Tel: 781-370-6150 Fax: 781-370-6550

Email: [email protected]

Date post:	08-Aug-2018
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