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DRAWING A CONVENTIONAL SHAFT-BREAK IN ALIBRE

Discussion in 'Tutorials and Tips from the Community' started by Paul W, Jul 12, 2018.

  1. Paul W

    Paul W Member

    DRAWING A CONVENTIONAL SHAFT-BREAK IN ALIBRE
    THE PROCESS INVOLVES COMPLETELY REDRAWING THE VIEW WITH 2D SKETCHING, USING THE ‘NODES’ FROM THE LINES IN THE ORIGINAL DRAWING VIEW.

    PART 1: SET UP

    The following model will be used as a reference:

    3D.jpg
    Drawing will be created from solid model of 24” long 1” diameter bar.


    STEP 1: CREATE A NEW INVISIBLE LAYER.

    This is where we will send the lines we don’t want to show.

    (To show any items in this layer again , just make the layer visible, by checking the box.)

    NEW INVISIBLE LAYER.JPG




    STEP2: “SOMEHOW” MAKE THE NODES AT THE INTERSECTIONS OF THE ORIGINAL LINES STAY VISIBLE AND SELECTABLE IN SKETCH VIEW.

    This is the key!

    The reason we need to do this is that Alibre does not have PROJECT-TO-VIEW in the drawing sketch environment!

    MAKE NODES VISIBLE: Dimension two opposite original lines in the Drawing View.

    (If the ‘Design Dimension’ comes in with the view, get rid of it and manually dimension that line.)


    DIM.jpg

    STEP 3: IN THE DRAWING VIEW, SEND ALL ORIGINAL LINES TO THE INVISIBLE LAYER.

    You can’t do this in sketch mode.

    MOVE TO INVIS.jpg

    Now right-click the view to be broken and select “Activate Sketch In View”.

    The nodes are now visible in Sketch View:


    NODES.jpg

    STEP 4: REBUILD THE VIEW IN SKETCH MODE.

    Join the dots (nodes)…with the Line Tool.

    REBUILD VIEW.jpg

    STEP5: DRAW THE SHAFT BREAK.

    It might be best to turn off “Centers” if they are on in the view since it will be easier to see the “construction lines” that need to be removed before leaving Sketch Mode at the end.

    On that note, there are no TRUE Construction Lines available in Drawing Sketch Mode!


    The following figure will be used as a reference in constructing the break:​


    SHAFT BREAK CONSTRUCTION.jpg

    _______________________________________________________________________________________________
     
    Last edited: Jul 12, 2018
  2. Paul W

    Paul W Member

    PART 2: SKETCH THE BREAK

    THE FOLLOWING DEMONSTRATES ONE SUCH WORKFLOW THAT WILL GET THE JOB DONE:


    Draw a horizontal line from the midpoint of the line at one end to the midpoint of the line at the other end:

    LINE MIDPTS.jpg

    CAREFULLY DECIDE WHERE THE DETAIL IS THAT NEEDS TO BE SHOWN IN YOUR PART. HERE WE WILL JUST BREAK A CERTAIN DISTANCE FROM THE ENDS.

    Offset @ each of the end lines of the sketch:

    The break will be drawn at these lines.


    OFFSET@ENDS 2.jpg

    Use the Intersect Tool to trim the lines as shown:

    Pick the portions of the lines you want to keep.


    INTERSECT.jpg


    The indicated nodes are where the ellipses will be copied to & from:

    INTERSECT SHOW.jpg

    Create an offset for the first ellipse:

    (Here R/6 = 0.5/6 = 0.833333)

    OFFSET FOR ELLIPSE.jpg


    Create the first ellipse using the midpoints of the two “construction lines”:


    ELLIPSE.jpg

    Mirror the ellipse:


    ELLIPSE MIRROR.jpg

    Copy the ellipses using the 'from & to' points:

    COPY ELLIPSES.jpg

    Trim excess lines (or move to invisible layer) until we get the in the following:

    TRIM.jpg

    Make sure all the created lines are in the Visible:Solid layer:

    Be aware that the default drawing layer is Continuous: Solid.


    VISIBLE . SOLID.jpg
     
    Last edited: Jul 12, 2018
  3. Paul W

    Paul W Member

    PART 3: CLEAN UP THE DRAWING VIEW

    Return to Drawing View and create a broken view:

    Sheets & views tab | Broken view & use the default straight break type. Drag the break lines near the ends of the sketched shaft break as shown:


    BROKEN VIEW.jpg

    The view scale can now be changed:

    SCALE.jpg

    Fit the views to the sheet:

    FIT TO SHEET.jpg


    Create the hatch pattern on the ellipses:

    Note that the appearance of the pattern will change with the view scale, so adjust to suit.


    HATCH.jpg

    Move the break lines to the Invisible layer:

    You may first want to adjust the position of the break lines again and the distance between them. Right click the break lines & select edit.


    BROKEN TO INVIS.jpg


    The drawing can now be completed:

    FINISH.jpg
     
  4. bigseb

    bigseb Alibre Super User

    A lot went into this. Well done!
     
  5. slipstick

    slipstick Member

    Nice! Thanks!
     
  6. simonb65

    simonb65 Senior Member

    Great tutorial :)

    Pity though that the builtin Broken View doesn't do this as an style option (would be so easy for Alibre to implement ;)) or do it automatically on cylindrical objects!
     
  7. Paul W

    Paul W Member

    First, thank you all for the kind words.:)

    ________________________________________________________________________________________________________________________

    Before I wrote this tutorial, I did a search to see what software does have this capability. I guess we can’t feel too bad because forums show that S/W users are still asking and frustrated AutoCad users’ have been requesting it for years.
    NX has the capability, but it is high-end software:
    .

    The one advantage we have is that Alibre LLC management does listen to us.
     
    simonb65 likes this.
  8. Lew_Merrick

    Lew_Merrick Alibre Super User

    The thing (begun by John Walker with Autodesk) is the dearth of actual Drafting and Documentation Experience typical in CAD companies (something that has been all too true since the late-1960's)! This is merely one of the "fronts" where this shows up.
     

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