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usage:howto [2020/01/10 22:35] – Otional scale and angle mention for block insertion fa201usage:howto [2020/09/08 21:49] (current) – [How to 'fake' a circular dimension...] jack_sprat
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-**This section is under work** +[[usage:howto|How to]]
 ====== How to ====== ====== How to ======
  
 This section describes how to perform some tasks in addition to //User Manual// and //User Guides//. This section describes how to perform some tasks in addition to //User Manual// and //User Guides//.
 The content is the following: The content is the following:
-  - [[usage:howto#How to copy entities from drawing A to drawing B?|How to copy entities from drawing A to drawing B?]] +  * [[usage:howto#How to copy entities from drawing A to drawing B?|How to copy entities from drawing A to drawing B?]] 
-  - [[usage:howto#How to create standard blocks to be re-used ?|How to create standard blocks to be re-used ?]]+  * [[usage:howto#How to create standard blocks to be re-used ?|How to create standard blocks to be re-used ?]] 
 +  * [[usage:howto#How to add radius circle tangent to two lines ?|How to add radius circle tangent to two lines ?]] 
 +  * [[usage:howto#How to convert from mm to inches ?|How to convert from mm to inches ?]] 
 +  * [[usage:howto#How to fake a circular dimension|How to fake a circular dimension]] 
 + 
 +---- 
  
 ===== How to copy entities from drawing A to drawing B? ===== ===== How to copy entities from drawing A to drawing B? =====
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 Let's say, we want to create a special part as shown below. Note that there are 2 layers, one for the part (yellow) and one for its axis (red). {{usage:how-to:special_part.png|Special part}} Let's say, we want to create a special part as shown below. Note that there are 2 layers, one for the part (yellow) and one for its axis (red). {{usage:how-to:special_part.png|Special part}}
- 
  
 ==== Step 1: create a block ==== ==== Step 1: create a block ====
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   - Optionally, you can modify the block: look at the [[https://librecad.readthedocs.io/en/latest/ref/toolbars.html#other-toolbars|tool option]] bar, where you can set a [[https://librecad.readthedocs.io/en/latest/ref/toolbars.html#from-block-library|scale factor and rotation angle]] **before the block is inserted**.   - Optionally, you can modify the block: look at the [[https://librecad.readthedocs.io/en/latest/ref/toolbars.html#other-toolbars|tool option]] bar, where you can set a [[https://librecad.readthedocs.io/en/latest/ref/toolbars.html#from-block-library|scale factor and rotation angle]] **before the block is inserted**.
  
-Note that other folders are also visible: these are coming by **standard** with the installation of LibreCAD. Your library will be **added** to the standard library. This way, **your library is not deleted when uninstalling lLibreCAD** from your system.+Note that other folders are also visible: these are coming by **standard** with the installation of LibreCAD. Your library will be **added** to the standard library. This way, **your library is not deleted when uninstalling LibreCAD** from your system. 
 + 
 +===== How to add radius circle tangent to two lines ? ===== 
 + 
 +  - draw two crossing lines 
 +  - create a construction layer 
 +  - On the construction layer, draw a fillet with the required radius (shown dashed in image so visible) 
 +  - On the drawing layer, draw a circle with the "centre, point" tool, using the centre of the fillet and its radius 
 + 
 +The lines and circle will be perfectly tangent, for instance the "trim" will work on both lines. 
 + 
 +{{usage:given_radius_cicle_tangent_to_two_crossing_lines.png|How to add radius circle tangent to two lines}} 
 + 
 +===== How to convert from mm to inches ? =====  
 + 
 +Let's assume General Scale is set to 1. 
 +This is for an intended print scale of 1:1.   
 + 
 +Then to scale from mm to inches:  
 + 
 +  - Select all, by command (Tools - Select - Select All), or by pulling up a window around it. 
 +  - Scale (Tools - Modify - Scale) 
 +  - Specify reference point, normally best 0,0. Enter. 
 +  - In the Scaling Options:\\ {{:usage:scaleopts.png}} 
 + 
 +To adapt the Drawing Preferences to inches:  
 + 
 +  - Set Main Units:\\ {{:usage:mainunits.png}} 
 +  - Adapt Dimensions. You could do it with General Scale 1/25.4, but better let it at 1 for possible later print scaling and change the size values individually. You can later use these settings for all your inches drawings.\\ {{:usage:drawprefs.png}}\\ And save it under a new name of course. 
 + 
 +===== How to 'fake' a circular dimension... ===== 
 +There isn't a circular dimension tool for annotating arcs, but we can use one of the existing dimension tools, and then manually edit the label. 
 + 
 +This really only works convincingly on segments of circles, although the approach could be applied to a continuous string of line entities, at a push, maybe with the ''Dimension: Aligned'' tool. 
 + 
 +**Step-by-step example:** 
 +  - draw a circle, centred on a grid point :: ''Circle: Centre, Point'' tool 
 +  - draw two lines, from centre to perimeter, to define a segment :: ''Line: 2 Points'' tool 
 +  - divide the circle at the two lines, to create an arc (two, actually) :: ''Modify: Divide'' tool 
 +  - select the arc to find its length in the status bar 
 +  - create an angular dimension annotation between the two lines :: ''Dimension: Angular'' tool 
 +  - edit the dimension properties, defining a new label with the length of the arc :: ''Modify: Properties'' tool
  
 +{{ :usage:lc_circulardimension.png?650 }}
  
 +**Hint:** in addition to ''Snap: Centre'', you can find the centre of an arc with the ''Dimension: Radial'' tool; you can then use two radial dimensions as temporary construction lines from which to create the angular dimension.
  
usage/howto.1578695746.txt.gz · Last modified: by fa201

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