# Drawing Exact Profile from Engineering Drawing? 

**URL:** <https://discourse.shapr3d.com/t/drawing-exact-profile-from-engineering-drawing/31442>\
**Category:** Modeling Questions\
**Created:** [April 23, 2024, 2:02pm UTC](https://discourse.shapr3d.com/t/drawing-exact-profile-from-engineering-drawing/31442 "2024-04-23T14:02:06Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![aoez007](https://avatars.discourse-cdn.com/v4/letter/a/bbce88/32.png) [@aoez007](https://discourse.shapr3d.com/u/aoez007)\
**Post date:** [April 23, 2024, 2:02pm UTC](https://discourse.shapr3d.com/t/drawing-exact-profile-from-engineering-drawing/31442/1 "2024-04-23T14:02:06Z")

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Hello Everybody!

This is my first post, hope I can find the help this community provides.

I am creating a iPad Dock and currently work with apples design guidelines.

In their guidelines, they have a profile for the rounded corners [attached picture]. I fail however with the current toolset to copy the exact profile.

How do I accomplish this?

 ![Screenshot 2024-04-23 at 15.57.56](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/0/b/0b7e4b8c51adebbee8d34a3c71e872ef90b02576.jpeg)

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**Author:** ![Xdrakosha](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/xdrakosha/32/24881_2.png) [@Xdrakosha](https://discourse.shapr3d.com/u/Xdrakosha)\
**Post date:** [April 23, 2024, 2:05pm UTC](https://discourse.shapr3d.com/t/drawing-exact-profile-from-engineering-drawing/31442/2 "2024-04-23T14:05:34Z")

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I see only one option is a spline tool 🙂 In case arc is not working.

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**Author:** ![Scomisur](https://avatars.discourse-cdn.com/v4/letter/s/d2c977/32.png) [@Scomisur](https://discourse.shapr3d.com/u/Scomisur)\
**Post date:** [April 23, 2024, 3:06pm UTC](https://discourse.shapr3d.com/t/drawing-exact-profile-from-engineering-drawing/31442/3 "2024-04-23T15:06:57Z")

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Did this using spline tool with 8 control points. Then set each point to shown coordinates.

 ![IMG_0064](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/8/3/83ce7d8ae658bb718667045b53115b2c6cbd1b1f.png)

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**Author:** ![PEC](https://avatars.discourse-cdn.com/v4/letter/p/67e7ee/32.png) [@PEC](https://discourse.shapr3d.com/u/PEC)\
**Post date:** [April 23, 2024, 4:32pm UTC](https://discourse.shapr3d.com/t/drawing-exact-profile-from-engineering-drawing/31442/4 "2024-04-23T16:32:25Z")

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Hi,

in addition to @Scomisur solution with fit spline, you can also get a perfect fit with control spine, using 6 points. .shapr workspace below.  
[Profile spline.shapr](https://discourse.shapr3d.com/uploads/short-url/mP7Rmyoyp89XPVfyzFS3QtlET5P.shapr) (133.5 KB)

  
 ![exact profile explained](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/d/b/dbede215c692ef5d720c8da432d8f78351a75207.png)

_Some explanations as it may be useful for other situations_  
The curve is symmetrical vs a 45 degrees line, so the control points will be also symmetrical.

- draw to scale x and y axis as well as a 45 degree line.
- draw circles and set the exact center position using dimension constraints to create points 1, 2, 3, 4, 5 (Point 1 and 5 are symmetrical vs 45° line)
- add a point at the intersection of the curve and the 45° line, as there is more than one curve that can go through the points
- draw a 6 control points spline, between start and end points, place the control points where you want along the way
- set symmetry constraint for each pair of control point
- set tangent constraint on point 1
- set coincident constraint for each of the points

**Number of control points is 6**  
As we want to set 5 positions plus the fact that the curve is tangent to axis, this leads to 6 degrees of constraints, hence we need a 6 control points spline.  
Control points will be symmetrical 2 by 2 vs 45° line.

Pec