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IndustryArena Forum > CAM Software > Vectric > Resizing a shape
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  1. #1
    Join Date
    Apr 2011
    Posts
    0

    Resizing a shape

    Hello

    I am very new to the world of cnc, been using trila of V carve pro.

    I need to draw a shape, for example 2000mm in width.
    the shape is basially a rectangle with a step up at a 45 degree angle approximately 300mm from each end.

    I need to be able to resize this shape to either a smaller or larger size
    with out changing the 45 degree angle.

    I have been able to use node editing and select points and stretch yet
    this will change the angle as i stretch...

    can anyone help

    Thanks in advance
    Redvanth

  2. #2
    Join Date
    Aug 2005
    Posts
    597
    Hello Redvanth,

    Save and email the file to me so I can see what you are
    trying to achieve.

    Tony

  3. #3
    Join Date
    Jan 2009
    Posts
    68
    It is probably easiest to select the item (group it first if it is made of individual items) and select offset. Offset larger (or smaller) as needed. You will then have the new larger item plus the original item on the screen. Then chose node editing to move whatever points necessary to maintain the angles.
    Then delete the original item.

  4. #4
    Join Date
    Aug 2005
    Posts
    597
    Not sure this approach will work because grouping individual entities
    doe not link them together for an offset operation - not sure that
    offsetting is correct either.

    Email the file - [email protected] - and I'll take a look

    Tony

  5. #5
    Join Date
    Jan 2009
    Posts
    68
    Quote Originally Posted by Tony Mac View Post
    Not sure this approach will work because grouping individual entities
    doe not link them together for an offset operation - not sure that
    offsetting is correct either.
    Hi Tony,
    I just tried it again, Seems to work fine for me and I use it all the time to do what redvanth was inquiring about. It took 9 mouse clicks. With a more complicated object, either using "Weld" or any of the "Join" commands links the objects fine for offsetting.
    One can also just select the object and then scale either x or y to the new dimension and then node edit the final point for the 45 degree angle. Since the original shape goes away with "scale", one will need to draw a separate 45 degree construction line before scaling to know where the 45 degree node should be. (Just click on the line and drag it to where you need it. Maybe select a new layer color.) Took 12 mouse clicks.
    One can also "copy-paste" an identical object, slide it over to the side and node edit it. Maybe change colors and then slide it back over the original to make sure the critical points are still in the correct position.
    None of these methods should take more than 15 or 20 seconds.
    I have been using V-Carve for about 4 years on my ShopBot and I just love this program.

  6. #6
    Join Date
    Aug 2005
    Posts
    597
    Thank you for sending the additional information + files

    As you have found by experimenting – Resizing and Offsetting does not give the required results.

    It is possible to,

    Place Guidelines at the required positions
    Node Edit
    Drag to select all of the required nodes – include the angled region

    Place cursor over a node > Click > Drag > Snap to the required Guideline location
    But this is all very manual and I don’t think it’s the appropriate method.

    You probably need to be looking for Parametric CAD software that allows the designs to be modified programmatically.

    Sorry we couldn’t be more helpful and good luck with the project

    Regards,
    Tony

  7. #7
    Join Date
    Jan 2009
    Posts
    68
    Hi Tony,

    Just out of curiosity, the shape was described as a rectangle with two angled ends and the ends need to be closer or farther apart. What was the additional information?

    Seems like the object could be selected, node mode turned on, cut two straight lines with "C", pull the halves apart to the correct distance and stretch the lines back together with the mouse cursor.

    Just wondering about the rest of the story.

  8. #8
    Join Date
    Aug 2005
    Posts
    597
    Node editing + selecting and dragging nodes etc. is not
    the answer, plus there are other shapes that need extending
    and inserting continuations of the design.

    A more automated approach is the way forward.

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