# Some help please

**URL:** <https://discourse.shapr3d.com/t/some-help-please/14024>\
**Category:** Modeling Questions\
**Created:** [July 24, 2021, 4:00pm UTC](https://discourse.shapr3d.com/t/some-help-please/14024 "2021-07-24T16:00:56Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Nico](https://avatars.discourse-cdn.com/v4/letter/n/b5a626/32.png) [@Nico](https://discourse.shapr3d.com/u/Nico)\
**Post date:** [July 24, 2021, 4:00pm UTC](https://discourse.shapr3d.com/t/some-help-please/14024/1 "2021-07-24T16:00:56Z")

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Hey there,

Creating that arch on top of a gate for a client. It’s made of steel flat bar coming from de wood post.  
I cannot find a way to build the 2” flat bar (3/8”) on top of that arch as rafters (in red in pics). Also I would need a way to have them let’s say 4” appart and it would be nice to have a tool to add points on drawing or edges.

Thanks

 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/4/48523b002a7bd8e8574b1619bde725474e4211de.jpeg)

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**Author:** ![TigerMike](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/tigermike/32/32650_2.png) [@TigerMike](https://discourse.shapr3d.com/u/TigerMike)\
**Post date:** [July 24, 2021, 6:21pm UTC](https://discourse.shapr3d.com/t/some-help-please/14024/2 "2021-07-24T18:21:53Z")

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If your main arc is circle segment, do this. Sketch a 4" radius circle at the center of the mid point rafter. Draw a line starting where the arc and 4" circle meet and make the line tangent to the arc (red highlight). Draw a vertical line and make it perpendicular to the line segment (yellow highlight). The angle (green highlight) as shown in my example is 4.563°. You can now copy-rotate the rafter at that angle relative to the center of the main arc. Does this work for you?

 ![arcSpacing](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/4/4e5fb13a1dd856b6287d126475a4452844287db5.jpeg)

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**Author:** ![TigerMike](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/tigermike/32/32650_2.png) [@TigerMike](https://discourse.shapr3d.com/u/TigerMike)\
**Post date:** [July 24, 2021, 6:42pm UTC](https://discourse.shapr3d.com/t/some-help-please/14024/3 "2021-07-24T18:42:46Z")

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Silly me. An easier way is to draw a line from the intersection of the arc and 4" circle to the arc center. Same angle… 4.563°.

 ![arcSpacing2.PNG](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/5/5bb4912d934bc60bb128f1d06d71a5df48ac6aeb.jpeg)

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**Author:** ![Nico](https://avatars.discourse-cdn.com/v4/letter/n/b5a626/32.png) [@Nico](https://discourse.shapr3d.com/u/Nico)\
**Post date:** [July 29, 2021, 7:43pm UTC](https://discourse.shapr3d.com/t/some-help-please/14024/4 "2021-07-29T19:43:32Z")

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Thank you for the help it worked.