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--- usage:howto [2020/01/03 15:19] – [How to] Summary of how-tos fa201
+++ usage:howto [2020/09/08 21:49] (current) – [How to 'fake' a circular dimension...] jack_sprat
@@ Line 1: / Line 1: @@
-**This section is under work**
+[[usage:howto|How to]]
 ====== How to ======
 This section describes how to perform some tasks in addition to //User Manual// and //User Guides//.
 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? =====
@@ Line 25: / Line 30: @@
 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 ====
@@ Line 52: / Line 56: @@
   - Activation the new library path: on latest LibreCAD version, you can go to the //Library browser// dock window and click on //Rebuild// button. If this button is not available then you have to quit LibreCAD and relaunch it. Then you should see the //Special// folder in the //Library browser// tree.
   - Click on the //Special// folder to view its content: the //special_part.dxf// is available with a miniature picture. {{usage:how-to:library.png|My library with the Special folder and the special_part}}
-  - Finally, you can insert this block in any drawing by slecting this block and clicking on //Insert// button.
+  - Finally, you can insert this block in any drawing by selecting this block and clicking on //Insert// button.
+  - 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 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.
-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.
+**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.

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