I am converting hand pattern drafting instructions to work in QCAD. I've come up against something that I simply can't figure out. Please see the attached drawing. I apologize for the quality, it comes from an old book.
In the hand drafting instructions, you are supposed to put a square with one side on point "O" and the other side on Point "P" and rotate/slide the square until it touches the line "N". This new point is the "Q". Thus O-Q and P-Q are perpendicular.
I tried creating a virtual "square" in QCAD and rotating it with no success. You've always come to my rescue in the past, I sure hope you have a solution for this one.
Thank you for your time.
Find Perpendicular Lines Meet on Line
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Post one question per topic.
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Find Perpendicular Lines Meet on Line
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- Square.jpg (17.08 KiB) Viewed 5896 times
Re: Find Perpendicular Lines Meet on Line
Could you post screen shots of what the drawing looks like at first and what the solution should look like (approximately, if you cannot construct it)? Thanks.
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- Full Member
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Re: Find Perpendicular Lines Meet on Line
Here is a before and an after. The magenta lines are the "square". As you can see, they are not even close to perpendicular, but you get the idea. I put the point letters in to help clarify to the original image.
I've also included the entire file, if you want to play with it.
Thank you.
I've also included the entire file, if you want to play with it.
Thank you.
- Attachments
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- DraftBodice.dxf
- (117.78 KiB) Downloaded 411 times
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- DrawingFinish.jpg (37.18 KiB) Viewed 5893 times
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- DrawingStart.jpg (23.39 KiB) Viewed 5893 times
Re: Find Perpendicular Lines Meet on Line
If I understand your problem correctly, you can use Thales' theorem:
- Draw > Circle > Two Points
- First point is P, second is O
- Intersection between circle and line N is Q
- Draw > Circle > Two Points
- First point is P, second is O
- Intersection between circle and line N is Q
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- Full Member
- Posts: 84
- Joined: Sat Nov 03, 2012 2:00 am
Re: Find Perpendicular Lines Meet on Line
Andrew, your skills never cease to amaze me. Such a simple solution and it works perfectly. I really appreciate your time on this.
By the way, I've gotten quite a large audience over on YouTube and I'm about to tell them all they need to buy QCAD Pro. I hope this generates some income for you to offset your time answering all my questions. I'm also contemplating a plugin for QCAD Pro, that I will release for free. They'll have to buy your software to use it.
Thanks again,
Lori
By the way, I've gotten quite a large audience over on YouTube and I'm about to tell them all they need to buy QCAD Pro. I hope this generates some income for you to offset your time answering all my questions. I'm also contemplating a plugin for QCAD Pro, that I will release for free. They'll have to buy your software to use it.
Thanks again,
Lori
Re: Find Perpendicular Lines Meet on Line
No problem.wildspidee wrote:Andrew, your skills never cease to amaze me. Such a simple solution and it works perfectly. I really appreciate your time on this.
That sounds great, thanks!wildspidee wrote:By the way, I've gotten quite a large audience over on YouTube and I'm about to tell them all they need to buy QCAD Pro. I hope this generates some income for you to offset your time answering all my questions. I'm also contemplating a plugin for QCAD Pro, that I will release for free. They'll have to buy your software to use it.
If you need any help with the plugin, let us know over at Developers and Contributors.