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by mrdic
Wed Nov 28, 2018 4:45 am
Forum: Python scripting and macros
Topic: exporting (list of) polygons to DXF
Replies: 14
Views: 1027

Re: exporting (list of) polygons to DXF

.dxf polyline segments can also have width, not only a vector, so they can be used for arrowheads for dimensions or leaders. A poster on another CAD software forum that I use was looking how to work out the area of a polyline that had varying width for each segment on a map he was working with, it w...
by mrdic
Tue Oct 09, 2018 4:59 am
Forum: Help on using FreeCAD
Topic: Workflow for using stl geometry as reference
Replies: 7
Views: 776

Re: Workflow for using stl geometry as reference

Holes in .stl files are supposed to give clearance, and because they're polygons in profile rather than circles, and worse probably not regular polygons, circles derived from them will only be accurately located if the section that they're drawn through is going to give a regular polygon. Even when ...
by mrdic
Tue Oct 09, 2018 12:48 am
Forum: Help on using FreeCAD
Topic: Entity type differentiation from IGES files
Replies: 0
Views: 207

Entity type differentiation from IGES files

I'd been frustrated by importing IGES files into FreeCAD and finding that they import as a group that can't be broken down, downgrading causes the entities to be deleted en masse. Then I discovered that opening the IGES file instead of importing it allowed the group to be downgraded to entities whic...
by mrdic
Thu Aug 16, 2018 3:19 am
Forum: Help on using FreeCAD
Topic: WARNING: Flurry of questions about to ensue...
Replies: 25
Views: 1876

Re: WARNING: Flurry of questions about to ensue...

Whatever your motivation, ask your questions. There's often an intuitive disconnect between what tools do and what some people think they should do, and it's very possible that your difficulties result from that situation. That's complicated by users often finding ways to use tools that even the cod...
by mrdic
Thu Aug 02, 2018 1:13 pm
Forum: Users Showcase
Topic: WIP: torsen differential
Replies: 21
Views: 6565

Re: WIP: torsen differential

Audi and others have used it as a centre diff to split the torque front/rear on 4WD rally cars, and I remember seeing that McLaren had used them in F1 world-championship winning cars. Used to be called Gleason Torsen, so I expect that Gleason's been swallowed, but I'm pretty sure that the patents ex...
by mrdic
Fri Jul 27, 2018 11:22 pm
Forum: Help on using FreeCAD
Topic: Best practice to create a starter first thread
Replies: 10
Views: 494

Re: Best practice to create a starter first thread

It's probably possible to arrange a parametric situation so that the profile at the tip follows an involute sweep path to the valley diameter of the thread. I expect that someone's spent money researching a starter form that might be best for engagement and resistance to cross-threading at some poin...
by mrdic
Sun Jul 22, 2018 9:54 pm
Forum: Help on using FreeCAD
Topic: no 3D Dwires?
Replies: 3
Views: 190

Re: no 3D Dwires?

Thanks for the tip.
by mrdic
Sun Jul 22, 2018 11:58 am
Forum: Help on using FreeCAD
Topic: no 3D Dwires?
Replies: 3
Views: 190

Re: no 3D Dwires?

So I had a hunch and found that that's a difference between the 0.17/0.18 development builds that I'd been using and the release versions of 0.15/0.16. The installed release version of 0.17 does 3D Dwires as I remembered.
by mrdic
Sun Jul 22, 2018 10:27 am
Forum: Help on using FreeCAD
Topic: no 3D Dwires?
Replies: 3
Views: 190

no 3D Dwires?

Hi all, I'm returning to FreeCAD after a while, and I remember being able to snap a 3D draft WB Dwire in 0.15 or 0.16, and now in 0.17 and 0.18, I'm only able to draft 2D projections onto a workplane. Is that the case, or is there still access to 3D Dwire from some other avenue?
by mrdic
Sun Jun 24, 2018 9:05 pm
Forum: Help on using FreeCAD
Topic: How to bend a disk around a cylinder?
Replies: 25
Views: 2341

Re: How to bend a disk around a cylinder?

Isn't this compound involutes?

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