SKETCHING IN Pro/ENGINEER Part 1

Improved Intent Manager n Terminology –Entity, origin, constraint, reference, relation, parameter, weak dimension, strong dimension, conflict, etc. (Pro/E text pgs ) –Will learn on a need to know basis. n Entity: any element of the section geometry, such as, line, arc, circle, etc. n Vertex (vertices): point, endpoint n Origin: starting point –For example, in a new part file sketch this is the intersection of the horizontal, frontal and profile planes. One plane will be displayed parallel to the screen (frontal), while the other two will appear as edge views (horizontal and profile). X=0, Y=0, Z=0 (0,0,0)

Screen Layout in Part File Mode One-line Help Dashboard & Message Area Toolbars Pull down menus Roll over Sketching (Drawing) area Model Tree & Navigation Area Sketching icons Selection Filter Do Not Maximize – need room for dialog boxes

Sketch in Part File Mode n Creating a sketch in a part file, File – New – Part –, allows the modeler to sketch a 2- dimensional cross section of the object and then add a third dimension by extruding, revolving, etc. –In the example to the right, the cross section of the part will be sketched on the frontal plane, giving us height and width. The profile and horizontal planes will be viewed as edge views, which means the third dimension, depth, can be added by extruding, revolving, etc.

2-D Sketch Only n A sketch may be created 2-dimensionally, File – New – Sketch, which means a the modeler may NOT add a third dimension. n To learn how to sketch, trim/extend, drag, add and delete constraints and dimensions we will start with the 2-dimensional sketch mode only. –Advantages: »We don’t have to decide which plane to sketch on. »We don’t have to worry about where to start the sketch (origin). »If we accidentally draw a line on top of a line, leave a gap between two lines, etc., we can save the sketch and come back to it later. If we tried to extrude with these errors, we would not be able to extrude the sketch until all errors were corrected. –Disadvantage: »Only one sketch may be open at a time.

Improved Intent Manager n Inside Sketcher –Select appropriate sketching icon. –Move mouse to where entity will start/end and click mouse left mouse button, repeat until finished with drawing that type of entity –When finished sketching, select the Select icon. (Shortcut – select the middle mouse button) n Watch for hints and/or instructions –Roll over (or message line) –Prompt line

Sketching Icons n Line: object, line 2 tangent, or center line –Click, release, move (or drag), click, etc. –Select icon or middle mouse button to end n Rectangle –Click (corner), drag/move, release, click (diagonal corner) n Circle: circle, concentric circle, circle 3pt, circle 3 tangent, ellipse –Circle: click (center of circle), drag/move, click (point on circle) –Concentric circle: (share same center point): select existing circle, drag/move, release, click (point on new circle)

Sketching Icons cont’d. n Arcs: tangent & 3 pts, concentric, center/endpoints, 3 tangents, & conic –3pts. or tangent: select starting and ending endpoints, select point on line. If the arc is to be tangent, what for tangent relation symbol (T). –Concentric arcs:(share same center point): select existing arc, drag/move, release, click (point on new arc) –Center/endpoints arc: click (center of arc), drag/move, click (starting point of arc), drag/move, click (ending point of arc). n Fillets and Rounds: –Select two entities n Demo (For practice turn off dimensions and endpoints)

Sketching Icons cont’d. Select Icon selected Any other sketcher icon selected, i.e., circle – X at end of cursor

Practice n Start a new sketch file. –File – New – Sketch – type in the file name Practice1) n Using your Sketcher – Tools web print out, try all sketching icons, especially line, rectangle, and circle. –Watch constraints (condition defining the geometry of the entity, such as, horizontal, vertical, perpendicular, etc.) »When are they added? »What do the symbols mean? n To close a sketch and start over. –Select the Continue icon. –Start a new sketch, increase the number behind the file name one number. I.e., Practice2 It is more important to understand how to use each command than to sketch a real shape

Deleting Entities n Select Select icon (Shortcut: Middle Mouse button) n Several ways to select entity(ies) or constraint(s) –Click on entity or constraint –Use the Shift key to select multiple entities –Window entities (entity must be entirely inside box) –Select Edit – Select – All n Select one of two methods –Press Delete key –Right mouse button & select Delete n Repaint screen icon (Shortcut: CTRL-R) –Cleans up screen clutter n Practice deleting entities –If a sketch is open, close it –Start a new sketch ( File – New – Sketch – type in a file name) –Draw different entities –Practice deleting them one at a time and multiple entities. n

Right Mouse Click Options n Two Sets of Commands –Top portion: editing, manipulations & selection –Bottom portion: creation commands n Not available in rubber band mode

Right Mouse Click Options cont’d. n Factors to Consider –What command is currently invoked –What kind of entity is selected –What is currently pre-highlighted Select mode, blank drawing area Select mode, sketch started Line mode, blank drawing area Line mode, sketch started

Right Mouse Click Options cont’d Select icon onlyEntity selectedDimension selected

Practice n If a sketch is open, close it. n Start a new sketch file. –File – New – Sketch – type in the file name Practice) n Sketch multiple lines, rectangles, circles, etc. n Practice right mouse selections. n Practice deleting single and multiple entities. n Close the sketch.

Entity Colors Wildfire Entities will be yellow When the cursor is near the entities will turn light blue When selected will be red Colors may be adjusted to your liking.

Display Endpoints Toggle display of endpoints Line with endpoints turned off Line with endpoints turned on

Selecting Entities If the cursor is moved near an endpoint, or vertex, of a line or the center of a circle the endpoint or center will turn light blue. After it is selected it will turn red. If the cursor is moved near an entity, such as a line or a circle, the entity will turn light blue. After it is selected it will turn red. Asking ‘Is this what you want to select?’ Telling you this has been selected. Called Current Selection Purple means ‘Is this what you want to select?’ Red means this has been selected. Called Current Selection

Drag Entities n Dragging entities –Select Select icon –Select Edit – Move –Select, click and hold, entity or vertex, drag, release –Use the CTRL key to select several entities at once. n Practice on –Lines »Select somewhere along the line and drag »Select somewhere an endpoint and drag –Circles and arcs »Select center point and drag »Select on circle/arc and drag –etc.

Trim and Extend Entities n Dynamically trim –Deletes entity(ies). n Trim/extend –Trims/extends both lines, creating a sharp corner. –Select keeper side of lines. n Divide –Breaks the entity where selected. n Additional choices outside of Improved Intent Manager

Divide: Breaks the entity where selected. One Line. Notice only two yellow endpoints are displayed. Select Divide Icon. Notice change in endpoint of cursor Result: Blue endpoints tell us we now have two lines instead of one. Result: Three lines instead of two Place cursor over line where break is to occur. Notice change in cursor. Add a second break in the line Be careful when endpoints are turned off - this line looks like one line

Trim/Extend: Trims/extends two lines Two Lines First SelectionSecond SelectionResults Notice end result is the same Notice end result is different

Dynamic Trim: Deletes entity(ies) First SelectionResult Two Intersecting Lines

Dynamic Trim cont’d. Select endpoint Drag endpoint past the line it will be trimmed to Dynamic Trim the end of line to be deleted Two LinesDesired Result End Result If selected line does not intersect another entity, it will be deleted. First Selection

Dynamic Trim cont’d. Multiple Lines Drag the cursor over every entity to be deleted Results

Trim Circle: Method 1 Dynamic Trim Select portion of circle to delete Select portion of line to delete Given Desired Result Notice constraints are turned off while in dynamic trim mode

Trim Circle: Method 1 Dynamic Trim

Trim Circle: Method 2 Divide & Delete Select appropriate entity and press the delete key Result Break at tangent point Result When breaking, you may select off to the side of the tangent point a small amount and still be okay

Practice n Dragging entities n Trim and Extend entities n Break entities n Extremely important –Understanding how drag, trim, extend and break works, along with performing them correctly, will save you time and a lot of stress when we start extruding our sketches.

Homework n Complete Hands-On 15