LITIO.si CAD add-ons - FAQ


LitioLAB & Litio2 & 1 sheet metal FAQ, troubleshooting, information, and all what you need to know








  • Which CAD platforms does LitioLAB V. 1.0 work within?
     
    LitioLAB 1.0 works in the following CAD platforms and versions
    • AutoCAD: ALL versions (including R2021);
      ALL 20XX versions, starting with R 2000 (and Mechanical Desktop 200X); only Windows versions.
      Warning: LitioLAB DOES NOT run in Academic, Lite, nor LT versions.

    • GStarCAD: ALL versions, starting with 2016; only Windows versions.
      Warning: LitioLAB was not tested with GStarCAD Standard nor earlier versions.

    • ZwCAD: ALL versions, starting with 2018; only Windows versions.
      Warning: LitioLAB was not tested with earlier versions of ZwCAD.

    TIP: Please check LitioLAB 1.0 compatibility with your CAD system (feel free to run the TRIAL mode).
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  • Which CAD platforms does LITIO 2 work within?
     
    LITIO 2.0 sheet metal works in the following CAD platforms and versions:
    • AutoCAD: ALL versions (including R2021);
      ALL 20XX versions, starting with R 2000 (and Mechanical Desktop 200X); only Windows versions.
      Warning: LitioLAB DOES NOT run in Academic, Lite, nor LT versions.

    • GStarCAD: ALL versions, starting with 2016; only Windows versions.
      Warning: LITIO 2 was not tested with GStarCAD Standard nor earlier versions.

    • ZwCAD: We are preparing a ZwCAD version.
      Warning: No estimated publication date, though.

    TIP: Please check LITIO 2.0 compatibility with your CAD system (feel free to run the TRIAL mode).
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  • Which CAD platforms does LITIO 1 work within?
     
    LITIO 1.x sheet metal works in the following CAD platforms and versions:
    • BricsCAD: LITIO 1 runs within BricsCAD (v.8 and higher); only Windows versions.
      Warning: ; you need BricsCAD either Classic, Pro and/or Platinum.

    • ZwCAD: LITIO 1 runs within ZWCad (2017 and higher).
      Warning: only Windows versions.

    TIP: Please check LITIO 1 compatibility with your CAD system (feel free to run the TRIAL mode).
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  • After clicking "OK" in the "Settings" dialog, the program crashes and it does not keep configuration changes.
     
  • The program does not keep configuration changes in a new drawing session.
     
  • This problem arises when the user has not the required permissions and/or privileges to access or modify files in your CAD's SUPPORT folder (since all LITIO software need to modify the respective configuration file, either litio2.cfg, litio.cfg or litiolab.cfg; other files may also need to be accessed).
     
    To solve this problem, you need to be logged-in as an administrator, and/or, you need to get the necessary permissions or privileges: right click the folder, properties, security tab, give permissions. (If not, when making configuration [settings] changes, they will not have any effect, and Litio add-ons may might crash).
     
    You can also watch the following explanatory video.
     
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  • Dialog images are not clear
     
    Check your right add-on and CAD platform:
    • LitioLAB & Litio 2.0 - All CAD platforms: Got to the SETTINGS dialog of your LITIO add-on, and choose the color of your choice.
      For additional details, check the Installation and Running FAQ and look at the embedded video.

    • Litio 1.x Sheet metal - BricsCAD/ZwCAD: in your CAD's SUPPORT folder, replace your litio.slb file with the one within litio[blacklines].zip of your litio1.zip file.

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  • Does the program dimension the parts/the graphs?
     
    • LITIO 1 & 2 Sheet metal: Our own sheet metal experience shows that dimensioning of sheet metal developments is often superfluous. The common use is to use the files to a CAM (laser, plasma, automatic punching, etc.) cutting machine , or to a cutting provider without any dimensions. They (or you, if you have these machines) just cut the parts by pasting the figures into the CNC cutting machines.
       
      The other option is to plot the developments 1 to 1 (1 drawing unit = 1 inch or 1 mm) and to use the printouts as templates to cut the sheet metal patterns.
       
      The very irregular shapes of some kinds of developments [rectangle to round, intersections, Ys, etc.] makes dimensioning almost useless. (You would need lots of dimensions to define the figure shape).

    • LitioLAB: Something similar happens with graphs generated by LitioLAB, that are intended for further CAD processing and, eventually, CNC machining, laser cutting or 3D printing.

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  • How does the program realise, whether I use English or metric units?
    How it selects the display format of the values in the input boxes?
    Is 3'-6 the same thing as 3'-6", 3'6 or 3.5'?

     
    After starting the program [this is valid for all LITIO.si add-ons: LitioLAB, LITIO2 and LITIO1], it reads the values of certain CAD system variables in the current drawing session (e.g., MEASUREMENT, LUNITS, LUPREC, etc.), to automatically set the units to be used. (Refer to your AutoCAD user manual for further information about these system variables).
     
    If English units are used in the current drawing session (MEASUREMENT = 0), all inputs will be in feet and inches. If metric (MEASUREMENT = 1), inputs are in millimetres. After the input of each value, the program verifies the validity of its input format. For example, if the input has invalid characters, the program will show a zero value (0").
     
    English units:
     
    If unit mode is either of one of the following: Scientific (Lunits=1), Decimal (Lunits=2) or Engineering (feet and decimal inches; Lunits=3), the input would be shown in the Engineering (feet and decimal inches) mode (Lunits=3).
     
    If the units mode is either Architectural (feet and fractional inches; Lunits=4) or Fractional (Lunits=5), the input would be shown in the Architectural (feet and fractional inches) mode.
     
    The number of decimal places or the denominator for fractional inches is set by the system variable LUPREC.
     
    The following are examples of typical inputs and how are they shown in the input box.
     

     
    Notes:
    If UNITMODE = 0, the hyphen (-) separates feet and inches.
    If UNITMODE = 1, the hyphen (-) separates inches and fractional inches.
    (1) The value of AutoCAD system variable LUPREC is important in this case. The input value is rounded to the nearest fraction available [here x/16"].
    (2) The input has invalid characters (e.g., the word feet). The program shows a zero value (0").
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  • I have generated ruled surfaces with the RULESURF CAD command. Can LITIO2 unfold such surfaces?
     
    YES.
     
    Anyway, there are some considerations about ruled surfaces, which are not all developable. [That is: you can "unfold" them, but such a "development" (to call it in some way) would not match your object perfectly, and you would have difficulties during bending or rolling; e.g.: helical augers, which are not developable].
     
    A ruled surface is defined as a surface generated by the motion of a line called generator or ruling.
     
    Developable surfaces are a special class of ruled surfaces that can be developed or unfolded onto a plane without stretching or tearing.
     
    For example, in shipbuilding, doubly curved plates are manufactured by roller and line heating processes, while in HVAC, dust extraction, conveying systems, and piping industries, etc., the singly curved plates (developable surface) are manufactured by roller (linear bending) only.
     
    Developable surfaces are ruled surfaces for which the tangent plane is constant along each ruling. Cylinders and cones are the simplest, trivial developable surfaces. Cylinders are surfaces generated by a line as it moves, parallel to itself, along a curve. Cones are generated by a line, which passes through a fixed point P and moves along a curve.
     
    The following statements are the equivalent necessary and sufficient conditions for a surface to be developable:
     
    • Gaussian curvature is zero [that is, the line, which generates the surface by its motion (generator or ruling), is a straight line]; and
    • The normal vectors on a developable surface along the ruling are parallel; or
    • Developable surfaces possess the same tangent plane at all points of the same generator.

    In general, there are infinite possible ruled surfaces that can be generated between two closed curves. And only one of these would be developable. The problem is, then, to find THE developable one. [See examples in the following figure].

    Not developable and developable 
ruled surfaces
     

    Bibliography

      Hugo Beirao da Veiga
      Developable Surfaces
      Journal of Mathematical Fluid Mechanics XX (2004) 1-9
      Birkhäuser Verlag, Basel, 2004

      M. M. Lipschutz
      Theory and Problems of Differential Geometry
      Schaum's Outline Series
      McGraw-Hill, 1969

      Dr. K. H. Ko
      Prof. N. M. Patrikalakis
      Computational Geometry
      Massachusetts Institute of Technology, 2003

      M. J. Mancewicz and W. H. Frey
      Developable surfaces: Properties, representations and methods of design
      R&D Publication 7637
      General Motors, 1992

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  • Why do you encourage registered users and TRIAL users to add a link to your site?
     
    we very much appreciate your back-links, but not only this. We also appreciate your mentions of LITIO.SI software in engineering and architecture blogs, and in your professional social media (e.g., Linked-in).
     
    This is related with the shareware concept. Shareware developers let you try out a program for free, so that you may evaluate it. If you like the program and have a use for it, then you are obligated to purchase the REGISTERED VERSION. The idea of Shareware is to let useful programs spread through the industry by word of mouth, and the Internet.
     
    This marketing technique allows its authors to offer programs at very modest prices.
     
    Continuing to use the SHAREWARE VERSION of the program after evaluation and not purchasing the REGISTERED VERSION is an infringement of the LICENSE AGREEMENT. You are free to distribute the TRAIL version of the program, providing you do not charge a fee nor supply any upgrade information nor upgrade KEYS and/or files.
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