Need basic sketcher help, copying or duplicating shapes

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lemonbug
Posts: 276
Joined: Sun Oct 19, 2014 5:12 pm

Need basic sketcher help, copying or duplicating shapes

Postby lemonbug » Fri Apr 13, 2018 5:02 pm

Hi.

How can I duplicate the curves on the left side of my sketch to the right? after I do that I would like to take the entire shape that we created on the top side and mirror it on the bottom. thanks
Screen Shot 2018-04-13 at 12.57.10 PM.png
Screen Shot 2018-04-13 at 12.57.10 PM.png (81.18 KiB) Viewed 333 times

OS: Mac OS X
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.17.13509 (Git)
Build type: Release
Branch: tag: 0.17
Hash: 0258808ccb6ba3bd5ea9312f79cd023f1a8671b7
Python version: 2.7.14
Qt version: 5.10.1
Coin version: 4.0.0a
OCC version: 7.2.0
Locale: English/UnitedStates (en_US)
Attachments
Test.FCStd
(59.26 KiB) Downloaded 5 times
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Willem
Posts: 1357
Joined: Fri Aug 12, 2016 3:27 pm
Location: Lisse, The Netherlands

Re: Need basic sketcher help, copying or duplicating shapes

Postby Willem » Fri Apr 13, 2018 6:42 pm

Hi, the solution is
- Dimension and constrain the sketch
- make two arcs on the right side
- Constrain the arcs as equal
dbecad
Posts: 80
Joined: Fri Mar 16, 2018 11:10 pm

Re: Need basic sketcher help, copying or duplicating shapes

Postby dbecad » Fri Apr 13, 2018 8:19 pm

You can also use the symmetry tool on the vertical/horizontal axis, but as Willem mentioned you would still have to apply equal constraints to the radius, borders and tangent constraints to the end segments to lock everything in place.
symetry.png
symetry.png (43.67 KiB) Viewed 308 times
It's a too bad there are no "symmetry clone" tools to facilitate the process.

Cheers
Attachments
symetry.FCStd
(4.69 KiB) Downloaded 3 times
lemonbug
Posts: 276
Joined: Sun Oct 19, 2014 5:12 pm

Re: Need basic sketcher help, copying or duplicating shapes

Postby lemonbug » Fri Apr 13, 2018 9:27 pm

thanks. im trying to do this myself before opening your file. these arcs are really agitating me. i clearly don't under stand how to work with them well.
dbecad wrote:
Fri Apr 13, 2018 8:19 pm
You can also use the symmetry tool on the vertical/horizontal axis, but as Willem mentioned you would still have to apply equal constraints to the radius, borders and tangent constraints to the end segments to lock everything in place.
symetry.png
It's a too bad there are no "symmetry clone" tools to facilitate the process.

Cheers
lemonbug
Posts: 276
Joined: Sun Oct 19, 2014 5:12 pm

Re: Need basic sketcher help, copying or duplicating shapes

Postby lemonbug » Fri Apr 13, 2018 9:43 pm

is there a way to put a construction line directly between two other lines ors points so I can use this as a line of symmetry?
lemonbug
Posts: 276
Joined: Sun Oct 19, 2014 5:12 pm

Re: Need basic sketcher help, copying or duplicating shapes

Postby lemonbug » Fri Apr 13, 2018 10:03 pm

Given the arc on the left how do I mirror it to the point circled on the right? I selected the arc itself on the left, then the end point of the line, then the symmetric geometry button in sketcher. when i do this it shoots it way off to the right. i don't understand what it is referencing way over there. thanks
Screen Shot 2018-04-13 at 6.00.05 PM.png
Screen Shot 2018-04-13 at 6.00.05 PM.png (111.08 KiB) Viewed 287 times
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sgrogan
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Re: Need basic sketcher help, copying or duplicating shapes

Postby sgrogan » Fri Apr 13, 2018 10:08 pm

lemonbug wrote:
Fri Apr 13, 2018 10:03 pm
Given the arc on the left how do I mirror it to the point circled on the right? I selected the arc itself on the left, then the end point of the line, then the symmetric geometry button in sketcher. when i do this it shoots it way off to the right. i don't understand what it is referencing way over there. thanks
It's mirroring about the point you selected last. Select your arc then the vertical line (center line) You should make the mirror line construction.
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NormandC
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Location: Québec, Canada

Re: Need basic sketcher help, copying or duplicating shapes

Postby NormandC » Sat Apr 14, 2018 3:33 pm

Are you using v0.16 or v0.17?

In your screen capture, I don't see tangent constraints between the two arcs and between the line and the arc. You should always ensure tangency with a tangent constraint. Furthermore, it should be a point-to-point tangency constraint which replaces a coincident constraint.

IMO you are making it way more complicated than it needs to be by attempting to mirror two simple arcs. And you should take advantage of the Sketcher Polyline tool. It does not only create line segments but arcs too.

FC_lemonbug_polyline_01.gif
FC_lemonbug_polyline_01.gif (244.46 KiB) Viewed 253 times
lemonbug
Posts: 276
Joined: Sun Oct 19, 2014 5:12 pm

Re: Need basic sketcher help, copying or duplicating shapes

Postby lemonbug » Sat Apr 14, 2018 4:28 pm

apologies. ver 17 again. that poly line is exactly what i needed. i recall now that you showed me that a few years ago. Thanks everyone.
NormandC wrote:
Sat Apr 14, 2018 3:33 pm
Are you using v0.16 or v0.17?

In your screen capture, I don't see tangent constraints between the two arcs and between the line and the arc. You should always ensure tangency with a tangent constraint. Furthermore, it should be a point-to-point tangency constraint which replaces a coincident constraint.

IMO you are making it way more complicated than it needs to be by attempting to mirror two simple arcs. And you should take advantage of the Sketcher Polyline tool. It does not only create line segments but arcs too.


FC_lemonbug_polyline_01.gif
lemonbug
Posts: 276
Joined: Sun Oct 19, 2014 5:12 pm

Re: Need basic sketcher help, copying or duplicating shapes

Postby lemonbug » Sat Apr 14, 2018 4:29 pm

btw, is that an animated gif? if so what tool are you using to make them. thanks