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Thread: Unable to delete Layers, there is nothing on those Layers

  1. #11
    The Silent Type Mike.Perry's Avatar
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    Default Re: Unable to delete Layers, there is nothing on those Layers

    Hi

    Check out the following Technical Documents on the Autodesk web site under the Knowledge Base section -

    ID: TS22402 - Using the BLOCK command to create a single object from multiple objects

    ID: TS22657 - Advantages and disadvantages of using blocks and xrefs

    +

    AutoCAD Online Help File [F1] (hopefully AutoCAD LT is the same) -

    Contents tab -> AutoCAD Online Manuals -> User's Guide -> Create and Modify Objects -> Draw Geometric Objects -> Create and Insert Symbols.

    Have a good one, Mike

  2. #12
    Wish List Manager BrenBren's Avatar
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    Default Re: Unable to delete Layers, there is nothing on those Layers

    A block can be any number of things, some of which include dimensions, leaders, or custom made blocks such as standard parts. These blocks are a groups of items all linked together in one block (for example, our assembly details are all blocks, which consist of nuts, bolts, washers, etc, but can be moved, copied, inserted, etc as one item).

    So, if you had blocks, the purge command lists those blocks, and if by deleting those blocks, the layer becomes empty, it will delete the layers as well.

    BTW, Mike, yes the help command for LT is F1.

    Hope that helps.

  3. #13
    The Silent Type Mike.Perry's Avatar
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    Default Re: Unable to delete Layers, there is nothing on those Layers

    Quote Originally Posted by brenda.richardson
    BTW, Mike, yes the help command for LT is F1.
    Hi Brenda

    I was meaning the contents I was referencing within the Help File....

    Mike

  4. #14
    AUGI Director scott.wilcox's Avatar
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    Smile Re: Unable to delete Layers, there is nothing on those Layers

    Shawn:

    Let's start with non-purging layers. Check to see if there are any layers frozen in your paperspace viewports. If so, they will not be deleted when purging. Also, layers in block definitions will not purge, since they are referenced in the drawing.

    Blocks are defined elements in AutoCAD that are designed to reduce file size and increase consistency in a drawing. Let's say that you have a drawing with furniture in it, and each chair is drawn separately. AutoCAD maintains properties for each element in the drawing (lines, arcs, etc) for each chair. If your drawing had 1000 chairs in it, the file may get rather large.

    If your drawing had a chair that you created a block with, AutoCAD stores the information for that block, and when you copy the block 1000 times (to get 1000 chairs in your drawing), AutoCAD identifies the block with only the insertion point, rotation angle, and scale. All other information about the chair is in the block definition. The end result is a smaller drawing, since the number of elements in the drawing is drastically reduced, and consistency, since all chairs are instances of the same block. Another benefit of using blocks is that the changing of a block definition will update all blocks in the drawing.

    I'm sure Mike Perry's Technical Documents links will give you plenty of insight. I encourage you to check them out.

    There is also attributed blocks, where text and numeric information can be stored in each block instance.

    Scott

  5. #15
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    Default Re: Unable to delete Layers, there is nothing on those Layers

    If your layer appears empty, try FORMAT > POINTSTYLE and if the point style is a small dot change it to a large cross/circle design: you might have points in the drawing on those layers.

    The layers were deleted with the blocks but not listed in the purge window, probably because the PURGE NESTED ITEMS was checked. The blocks were redundant but not the layers since the blocks contained objects on those layers; once the blocks were purged then the layers were redundant and were purged.

    Another thing to check is whether a block is drawn using objects on layer1 and layer2, but it's insertion point on the drawing is in layer3.

  6. #16
    Member mandrews's Avatar
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    Smile Re: Unable to delete Layers, there is nothing on those Layers

    Blocks are groups of entities 'blocked' together to make one entity.
    E.g. You could draw a line & a circle say & then make these into a block with a name (say cirline) so that every time you inserted cirline the two entities would appear. Check out help on blocks or any good Autocad manual.

    It is possible that a block has been created on or including certain layers. If you delete the block or it has not been inserted it is still there as an entity to be used in your drawing database. Thus any layers although appearing to have nothing in them could be referenced to a block.

    You need to purge the unused blocks before their layers will go.

    Also if you create a block on Layer 0 it adopts the properties of the layer into which it is inserted. A block created on any other layer will retain that layers properties but will be inserted on the current layer.

    Hope this hasn't confused you too much.

  7. #17
    AUGI Director scott.wilcox's Avatar
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    Lightbulb Re: Unable to delete Layers, there is nothing on those Layers

    Another thought on deleting layers....

    Check to see if any wipeouts or textmasks exist in your drawing. TFRAMES controls the visibility of image boundaries. Turn TFRAMES on and look for wipeouts and textmasks. If text with textmasks were pasted in from another drawing, the textmask will appear as a "raster image", and not be grouped with the text. Perhaps this is the reason why some layers are not purging.

    I'm not sure if TFRAMES is available in LT2002 though.

    Scott

  8. #18
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    Default Re: Unable to delete Layers, there is nothing on those Layers

    hey everyone, thanks for all the great help.

    quick question
    i just copy and pasted text from one drawing onto another. then i changed the layer of that text in the property manager on the new drawing. now i want to delete the old layer of text (ie. the layer on which the text was on from the first drawing) but it wont let me, i tried purging but there isnt anything to purge. how can i rid myself of this layer?

    oh and how do i delete blocks, i dont think im using them but again when i try purging there is nothing shown to purge.

    thanks
    shawn.

  9. #19
    The Silent Type Mike.Perry's Avatar
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    Default Re: Unable to delete Layers, there is nothing on those Layers

    Hi

    Can you please post a drawing file that contains the Layers & Blocks that you wish to get rid of (Purge)?

    Would really help (me) to see the drawing file so we could comment + offer the most relevant information with regards to your questions.

    Have a good one, Mike

  10. #20
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    Unhappy Re: Unable to delete Layers, there is nothing on those Layers

    OK mike you asked for it....

    heres a drawing ive been using and its fine but i guess the issues ive been bringing up are to educate myself in cad a little better.

    - text on DEVICE layer, but work off of another layer (TEXT layer); why and how can i change it so it works normally?

    - layers 1 and 2 appear to be empty, but i cant delete or purge them; why?
    i think layer 1 was the layer that was created when i copied text from another drawing and pasted onto this one. i changed the text to the OPT2 layer from the properties window. (yeah i now deleted that text from the drawing altogether)

    - is there a block manager or something where i can organize all the blocks in the drawing? So i can delete them from the drawing if im not using them, what blocks i am using and their name, change their colour, change their layer etc.; if yes where? if no, why not and how can i do these things?

    and heres a perfect example of (just about) all my problems:
    in this drawing there is a block of a motor, how do i know what the name of the block is? (i figure it will be called motor but properties name it something different (ELE00) and that name isnt in the block list).
    it gets worse, this block seems to be in 2 parts, the light blue motor and then a box in grey. i somehow managed to change the blue colour and layer, but this block is attached to this grey box part (which i cant do anything to) the grey box part of the block is stuck in the OPT2 CONV layer even though it says it belongs to the OPT2 MOTOR layer. how can i get this block to be together?

    any and all input is GREATLY appreciated.
    THANKS in advance.


    forever confused,
    Shawn.
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