Bridging Drop Outs

Discussion in 'CNC Tutorials' started by SignTorch, 4/23/22.

  1. SignTorch

    SignTorch Artist

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    bridging is connecting a shape inside of a shape
    0.
     
  2. SignTorch

    SignTorch Artist

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    typically you'd offset the shape to be bridged to the outside to create a gap around the shape
    1. 2.
     
  3. SignTorch

    SignTorch Artist

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    you can bridge those two shapes - assuming they will be embedded in a sheet of some sort - an incomplete shape

    or you may have a 3rd perimeter shape representing the sheet - a complete shape

    3. 4.
     
  4. SignTorch

    SignTorch Artist

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    different software has different commands to bridge shapes and different ways of combining the sub-shapes

    normally you would combine all the sub-shapes into one shape object to be bridged

    then create additional shapes to bridge the gap

    and all of the shapes must be closed shapes

    8. 5.
     
  5. SignTorch

    SignTorch Artist

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    different software usues different terminology and command names

    ultimately bridging is a boolean operation

    where you either add or subtract the bridges

    add may be called weld or join

    subtract may be called trim or clip
     
  6. SignTorch

    SignTorch Artist

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    If bridging an incomplete shape you must subtract the bridges
    9.
    if you add the bridges then it will just add to the shape
    10.
     
  7. SignTorch

    SignTorch Artist

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    if bridging a complete shape then you must add the bridges
    6.

    if you subtract the bridges it will take away from the shape
    7.
     
  8. SignTorch

    SignTorch Artist

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    if all of the shapes being bridged are not closed results are unpredictable

    if the shapes being bridged are complex shapes with holes results may be unexpected

    if the shapes being bridged involve an assortment of holes and open and closed shapes the the results may be unpredictably unexpected

    if there happens to be duplicate shapes on top of shapes then that can cause all sorts of problems

    it depends on the software being used as to how and what order you select the objects, and how the objects are constructed, when applying boolean operations

    in corel draw I combine the two or three main shapes into one shape object - then I combine all the bridges into one shape object - then the boolean operation involves two shape objects which makes it fairly easy to understand what happens

    in other software it may not be that straightforward - some cam software automatically interprets nested shapes as one shape object with holes then each bridge must be added or subtracted individually

    in corel draw a shape can be open even if the start and end points are the same so you have to make sure shapes are closed - other software may automatically consider such curves as closed

    ultimately you need to know exactly how your software defines and handles shapes and sub-shapes and boolean operations

    or else boolean operations can become very difficult if everything isn't drawn and done exactly right
     

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