# Set a line as tagent in it center to a design point of a circle

**URL:** <https://discourse.shapr3d.com/t/set-a-line-as-tagent-in-it-center-to-a-design-point-of-a-circle/32389>\
**Category:** Modeling Questions\
**Created:** [June 11, 2024, 10:50am UTC](https://discourse.shapr3d.com/t/set-a-line-as-tagent-in-it-center-to-a-design-point-of-a-circle/32389 "2024-06-11T10:50:36Z")\
**Posts on this page:** 14\
**Page:** 1

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**Author:** ![Fletch](https://avatars.discourse-cdn.com/v4/letter/f/919ad9/32.png) [@Fletch](https://discourse.shapr3d.com/u/Fletch)\
**Post date:** [June 11, 2024, 10:50am UTC](https://discourse.shapr3d.com/t/set-a-line-as-tagent-in-it-center-to-a-design-point-of-a-circle/32389/1 "2024-06-11T10:50:36Z")

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Hello,  
I have so hard times with center my sketches/shapes in Shapr3D.  
I’ve decided to start over but it is still the same.  
I have a line XXmm : I want it to be tengent on a particular point of a center in it middle.

 ![shapr](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/3/0/30fc0818aab51d5c8bd81987406e69cae70e527e.jpeg)

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**Author:** ![Fletch](https://avatars.discourse-cdn.com/v4/letter/f/919ad9/32.png) [@Fletch](https://discourse.shapr3d.com/u/Fletch)\
**Post date:** [June 11, 2024, 12:12pm UTC](https://discourse.shapr3d.com/t/set-a-line-as-tagent-in-it-center-to-a-design-point-of-a-circle/32389/2 "2024-06-11T12:12:36Z")

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![shapr4](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/b/9/b9522ed333fc10f0ce2ac661ef554f5751c98495.jpeg)

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**Author:** ![Fletch](https://avatars.discourse-cdn.com/v4/letter/f/919ad9/32.png) [@Fletch](https://discourse.shapr3d.com/u/Fletch)\
**Post date:** [June 11, 2024, 12:12pm UTC](https://discourse.shapr3d.com/t/set-a-line-as-tagent-in-it-center-to-a-design-point-of-a-circle/32389/3 "2024-06-11T12:12:40Z")

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![shapr3](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/3/2/3206beb0548e0631fd668372e757eb98a8f4f8c0.jpeg)

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**Author:** ![Fletch](https://avatars.discourse-cdn.com/v4/letter/f/919ad9/32.png) [@Fletch](https://discourse.shapr3d.com/u/Fletch)\
**Post date:** [June 11, 2024, 12:12pm UTC](https://discourse.shapr3d.com/t/set-a-line-as-tagent-in-it-center-to-a-design-point-of-a-circle/32389/4 "2024-06-11T12:12:43Z")

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To be practical, here is what I wanted : everything centered

 ![shapr2](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/6/7/676def774a28058eb56df14df61c54a4f3d67b1e.jpeg)

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**Author:** ![JST](https://avatars.discourse-cdn.com/v4/letter/j/edb3f5/32.png) [@JST](https://discourse.shapr3d.com/u/JST)\
**Post date:** [June 11, 2024, 12:31pm UTC](https://discourse.shapr3d.com/t/set-a-line-as-tagent-in-it-center-to-a-design-point-of-a-circle/32389/5 "2024-06-11T12:31:12Z")

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Draw a radius from the center to the specific point, and use the midpoint constraint to it

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**Author:** ![MichaeI](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/michaei/32/35780_2.png) [@MichaeI](https://discourse.shapr3d.com/u/MichaeI)\
**Post date:** [June 11, 2024, 3:59pm UTC](https://discourse.shapr3d.com/t/set-a-line-as-tagent-in-it-center-to-a-design-point-of-a-circle/32389/6 "2024-06-11T15:59:51Z")

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@Fletch  
Constrain the sketch in such a way you can move it with out changing it. All angles and lengths is a safe.  
On the base line of the sketch you want to move, make a center point.  
Lock down your circle (radius and fixed point)  
Use the coincident constraint (will move the center point of the base line to the circle)  
Use the tangent constraint

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**Author:** ![MichaeI](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/michaei/32/35780_2.png) [@MichaeI](https://discourse.shapr3d.com/u/MichaeI)\
**Post date:** [June 11, 2024, 4:17pm UTC](https://discourse.shapr3d.com/t/set-a-line-as-tagent-in-it-center-to-a-design-point-of-a-circle/32389/7 "2024-06-11T16:17:39Z")

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@Fletch  
You can use the translate tool or the align tool.  
Note: when you put the first tick on the translate tool you can drag it to the edge or corner.  
Then use the replace face tool

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<div class="post-metadata">

**Author:** ![Fletch](https://avatars.discourse-cdn.com/v4/letter/f/919ad9/32.png) [@Fletch](https://discourse.shapr3d.com/u/Fletch)\
**Post date:** [June 11, 2024, 6:58pm UTC](https://discourse.shapr3d.com/t/set-a-line-as-tagent-in-it-center-to-a-design-point-of-a-circle/32389/8 "2024-06-11T18:58:46Z")

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Hello Michael and thank you !  
1st video : at 0:38, I don’t have the Coincident available 😕  
2nd video : so cool offset !!! usefull  
but Id’like to center it on the tube too (in lenght) as shown in this photo.

 ![shapr3](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/3/2/3206beb0548e0631fd668372e757eb98a8f4f8c0.jpeg)

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**Author:** ![MichaeI](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/michaei/32/35780_2.png) [@MichaeI](https://discourse.shapr3d.com/u/MichaeI)\
**Post date:** [June 11, 2024, 7:36pm UTC](https://discourse.shapr3d.com/t/set-a-line-as-tagent-in-it-center-to-a-design-point-of-a-circle/32389/9 "2024-06-11T19:36:09Z")

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@Fletch  
Ya it’s no problem, I thrive off likes in this form.

Coincidence: did you add a Center point to your baseline?

Are you saying to line the objects like this?

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<div class="post-metadata">

**Author:** ![Fletch](https://avatars.discourse-cdn.com/v4/letter/f/919ad9/32.png) [@Fletch](https://discourse.shapr3d.com/u/Fletch)\
**Post date:** [June 12, 2024, 7:05am UTC](https://discourse.shapr3d.com/t/set-a-line-as-tagent-in-it-center-to-a-design-point-of-a-circle/32389/10 "2024-06-12T07:05:53Z")

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Michael, thank you so much !  
For 1st video : I select point instead of line so now it’s perfect thank you.  
For 2nd video 0:06, I don’ have those useful dots 🙂

 ![shapr5](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/a/0/a051e2eefbe349c452eceeb9859b362d276222d5.jpeg)

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<div class="post-metadata">

**Author:** ![MichaeI](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/michaei/32/35780_2.png) [@MichaeI](https://discourse.shapr3d.com/u/MichaeI)\
**Post date:** [June 12, 2024, 4:17pm UTC](https://discourse.shapr3d.com/t/set-a-line-as-tagent-in-it-center-to-a-design-point-of-a-circle/32389/11 "2024-06-12T16:17:17Z")

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@Fletch  
Nice, ok, select the translate tool  
Click once to add the tic roughly were you want it  
Click that same tic and hold and drag  
When you click and hold those points should appear

Then add the second tic on the object your translating too and repeat.

Also give the align tool a shot too

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<div class="post-metadata">

**Author:** ![Fletch](https://avatars.discourse-cdn.com/v4/letter/f/919ad9/32.png) [@Fletch](https://discourse.shapr3d.com/u/Fletch)\
**Post date:** [June 13, 2024, 5:33am UTC](https://discourse.shapr3d.com/t/set-a-line-as-tagent-in-it-center-to-a-design-point-of-a-circle/32389/12 "2024-06-13T05:33:01Z")

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Again, thank you so much Michael. I have to practice now !  
After fow attempts, it seems the key is lock shapes/drawing to avoid tranformation when translate/align.

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<div class="post-metadata">

**Author:** ![MichaeI](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/michaei/32/35780_2.png) [@MichaeI](https://discourse.shapr3d.com/u/MichaeI)\
**Post date:** [June 13, 2024, 4:03pm UTC](https://discourse.shapr3d.com/t/set-a-line-as-tagent-in-it-center-to-a-design-point-of-a-circle/32389/13 "2024-06-13T16:03:31Z")

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@Fletch  
Practice……….  
Here take this file of many ‘for practice’ technical drawings. I’ve got them all off Facebook  
You can pick and choose the ones you want to do.  
I approach them like puzzles, handling them one line at a time. sometimes there’s missing information. I’m not saying doing any of these will make you better. But you would at the least be focused.

Google drive practice file:

> **[Practice I guess?(clean).shapr](https://drive.google.com/file/d/1TVKRw-peV9SdaIiI4J_p5hjaUKHx6otu/view?usp=drivesdk)**
>
> Google Drive file.

Tell me if you can’t download it  
And major props if you can do the toothbrush

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<div class="post-metadata">

**Author:** ![Fletch](https://avatars.discourse-cdn.com/v4/letter/f/919ad9/32.png) [@Fletch](https://discourse.shapr3d.com/u/Fletch)\
**Post date:** [June 13, 2024, 5:10pm UTC](https://discourse.shapr3d.com/t/set-a-line-as-tagent-in-it-center-to-a-design-point-of-a-circle/32389/14 "2024-06-13T17:10:39Z")

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Just download it ! I have a little something to do before :  
[Pressure sensor](https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Data+Sheet%7FMS5837-02BA01%7FA8%7Fpdf%7FEnglish%7FENG_DS_MS5837-02BA01_A8.pdf%7FCAT-BLPS0059)