Having difficulty with constraint precision in my sketch.

[Anonymous]

I'm rather new at Fusion 360, so I'm hoping it's just a stupid mistake on my end somewhere but it's been driving me nuts this afternoon so I figured I'd make a post about it:

I'm trying to make a sketch for some tracery I wanted to try and create in Fusion 360, and noticed while sketching that certain lines weren't intersecting at locations I had hoped. I've added an image showing parts of my process to hopefully illustrate the problem I'm having:

I've made a quick example in a new less cluttered document. I've placed the circles on the snapped centers of the plane and of the circles.I've also tried to make the circles by using manual constraints such as "Horizontal/Vertical" and "Tangent" but that did not solve the problem I was having. It also (with both methods) shows misalignment on the parts where the circles are supposed to tangentially touch:

I know I'm probably doing something wrong in the process but I'm not sure what it is that causes me to make this mistake. Hopefully it's a simple stupid beginner's mistake (in which case, my apologies).

Thank you in advanced for your time, thoughts and reply.

  Michael

[TheCADWhisperer]

Can you File>Export and then Attach your actual *.f3d file directly here rather than mere pretty pictures?

I suspect that you are seeing a graphics anomaly resulting in zooming wayyyyyyyyyyyyyyy in that is not actually a mathematic or geometry anomaly.

If that is the case - this is common to all CAD programs that I have used in the last 30 yrs.

(The other CAD programs have a setting for displaying curve resolution - not sure if there is one in Fusion.)

[Anonymous]

I've attached a .f3d file to this reply. Apologies for the pictures in the previous post.

[TheCADWhisperer · Accepted solution]

http://autode.sk/2IjAxwU

[Anonymous]

Thank you for the screencast.

I've followed your cast and have successfully applied the same constraints as you've shown in the cast. It's still showing the graphical anomaly to me when zooming in on but I'm glad to hear that it's not a mathematic or geometry anomaly which I was worried for.

Thanks again for your time and replies :-)!