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by Gray Area
Wed Mar 06, 2019 9:41 pm
Forum: Tutorials and videos
Topic: Sketcher tutorial
Replies: 197
Views: 18548

Re: Sketcher tutorial

I downloaded this tutorial the other day.

I give my thanks to chrisb and everyone who has worked with him in the making of this tutorial.

Gray Area
by Gray Area
Mon Mar 04, 2019 10:08 pm
Forum: Help on using FreeCAD
Topic: Parallel Arcs Sketcher to Part Design Problem
Replies: 39
Views: 735

Re: Parallel Arcs Sketcher to Part Design Problem

Attached my proposal. As said, most "problems" come from missing coincidences between the arc centers. From my PoV, it is cleaner now because : * There are remaining only 1 overall dimension and 1 offset dimension on each axis * Thickness is defined only once * Radius of "plies" is defined only onc...
by Gray Area
Mon Mar 04, 2019 8:52 pm
Forum: Help on using FreeCAD
Topic: Parallel Arcs Sketcher to Part Design Problem
Replies: 39
Views: 735

Re: Parallel Arcs Sketcher to Part Design Problem

Just for improvement, your design seems suboptimal. There are a lot of tangency constraints missing where arcs join lines. Also I guess I see tangency constraints on the arc centers, which seems quite unusual. Last clue is that if your part in constant-thick, you shouldn't have to repeat the thickn...
by Gray Area
Mon Mar 04, 2019 8:32 pm
Forum: Help on using FreeCAD
Topic: Parallel Arcs Sketcher to Part Design Problem
Replies: 39
Views: 735

Re: Parallel Arcs Sketcher to Part Design Problem

Instead of repeating the measures you can use equality on the arcs. You are correct. I did that from side to side. I did not, however, assume that all three (3) types of arcs are equal. When it warms up a little more, I go out to the garage, dig around, find my part, and use a measuring tape and ca...
by Gray Area
Mon Mar 04, 2019 8:25 pm
Forum: Help on using FreeCAD
Topic: Parallel Arcs Sketcher to Part Design Problem
Replies: 39
Views: 735

Re: Parallel Arcs Sketcher to Part Design Problem

You again forget that the fact that two points have the same coordinates does not mean that they are "COINCIDENT"ly constrained. The leftmost three centers of the inner and outer arcs are at he came spot but are not COICIDENTaly constrained. That is why you need several thickness dimensions. Box se...
by Gray Area
Mon Mar 04, 2019 5:56 pm
Forum: Help on using FreeCAD
Topic: Parallel Arcs Sketcher to Part Design Problem
Replies: 39
Views: 735

Re: Parallel Arcs Sketcher to Part Design Problem

Here is the latest iteration of my part. When it is completed, it will be an accurate drawing of the “gas tank support” of a C2 Corvette. I still have to place the mounting bolt holes, and input the actual measured dimensions. But, as is, this is roughly what the part looks like. As it is a parametr...
by Gray Area
Mon Mar 04, 2019 1:29 pm
Forum: Help on using FreeCAD
Topic: Parallel Arcs Sketcher to Part Design Problem
Replies: 39
Views: 735

Re: Parallel Arcs Sketcher to Part Design Problem

And although I'm experienced in modeling in 3D, again, I'm seeing a very steep learning curve in going from AutoCAD to FreeCAD. Having used AutoCAD in the past, that's definitely true. The whole parametric thing adds a level of complexity, as well as the constraint-based sketching. Not to mention t...
by Gray Area
Mon Mar 04, 2019 12:34 am
Forum: Help on using FreeCAD
Topic: Parallel Arcs Sketcher to Part Design Problem
Replies: 39
Views: 735

Re: Parallel Arcs Sketcher to Part Design Problem

As I need considerable "hands-on" practice, I'm going to redraw the sketch from scratch, attempting to simplify the constraints as I go along. You can show us the result for further comments. If you prefer geometric constraints over measures you made already half of the way. Have a look at the symm...
by Gray Area
Mon Mar 04, 2019 12:33 am
Forum: Help on using FreeCAD
Topic: Parallel Arcs Sketcher to Part Design Problem
Replies: 39
Views: 735

Re: Parallel Arcs Sketcher to Part Design Problem

For all those 0.125in constraints to be ok all your arcs centers are not constrained "COINCIDENT". The cleaner way should be that they are. You could box select the centers and apply coincident constraint to them and then have just a simple 0.125in length constraint somewhere for thickness of the s...
by Gray Area
Sun Mar 03, 2019 11:19 pm
Forum: Help on using FreeCAD
Topic: Parallel Arcs Sketcher to Part Design Problem
Replies: 39
Views: 735

Re: Parallel Arcs Sketcher to Part Design Problem

The sketch and part shown on my last post was my first attempt at drawing a real part. Obviously, I have a long way to go on the Learning Curve. For what it's worth, I'm an experienced 3D AutoCAD user. But, I like the design philosophy of FreeCAD with its parametric modeling. And although I'm experi...

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