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usage:howto [2020/04/01 12:47] – Format flywireusage:howto [2020/09/08 21:49] (current) – [How to 'fake' a circular dimension...] jack_sprat
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 +[[usage:howto|How to]]
 ====== How to ====== ====== How to ======
  
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   * [[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 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]]
  
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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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 {{usage:given_radius_cicle_tangent_to_two_crossing_lines.png|How to add radius circle tangent to two 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.1585745278.txt.gz · Last modified: 2020/04/01 12:47 by flywire

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