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by Brutha
Fri Mar 08, 2019 1:53 pm
Forum: Open discussion
Topic: Type of fixing / bracket...
Replies: 2
Views: 219

Type of fixing / bracket...

Hi All, This is not really a Freecad question, but since I'm doing some design with Freecad involved, I thought it was ok to post!! I'm building a new computer for my rowing machine, and I need to fix mount a reed switch connected to a replacement front panel. The sensor will go on the end of the br...
by Brutha
Tue Mar 05, 2019 2:28 pm
Forum: Assembly
Topic: Assembly3 preview
Replies: 1795
Views: 224191

Re: Assembly3 preview

Hi All, Doing some more testing while designing my barn door startracker. Of course, complete overkill to model the hinge, but it's fun to play around with Assembly 3 anyway! For some reason though, I've got to the point where I can't move the pieces of my hinge; a coplanar face constraint for the h...
by Brutha
Tue Feb 26, 2019 3:51 pm
Forum: Help on using FreeCAD
Topic: Moment of inertia
Replies: 4
Views: 599

Re: Moment of inertia

As a sidenote, just notice that it is quite easy to measure the value of the moment of inertia of objects as flywheels. ;) If you're able to easily get it unmounted, it could be a good exercise/confirmation. Thanks - that's quite an interesting thought - but in fact I think it would be a real pain ...
by Brutha
Tue Feb 26, 2019 3:12 pm
Forum: Help on using FreeCAD
Topic: Moment of inertia
Replies: 4
Views: 599

Re: Moment of inertia

Took a little digging out but this seems to be what you're looking for https://forum.freecadweb.org/viewtopic. ... 09#p104153 I just tried it on a cone on the Z axis and the line of Python worked using: Perfect, thank you very much! App.ActiveDocument.ActiveObject.Shape.copy().getMomentOfInertia(Ap...
by Brutha
Tue Feb 26, 2019 12:27 pm
Forum: Help on using FreeCAD
Topic: Moment of inertia
Replies: 4
Views: 599

Moment of inertia

Hi All, Have bought myself a cheapo rowing machine, but the computer that comes with it is exceedingly crap (can't even measure strokes accurately!), so thought I'd have a bit of fun building a new one with a raspberry pi! I'll be adding a new sensor on the flywheel (it only measure the cord being p...
by Brutha
Sun Feb 17, 2019 12:26 pm
Forum: Part Design module development
Topic: Part, PartDesign and Assemblies
Replies: 4
Views: 2410

Re: Part, PartDesign and Assemblies

Hi, Just to add my thoughts, since I had a bit of a play with Assembly 3 the other day. What I propose is that the App::Part be indeed the assembly container, that can contain either directly a PartDesign::Body, or several ones, to form a physical part, or App::Link links to other App::Parts and the...
by Brutha
Wed Jan 30, 2019 12:34 pm
Forum: Assembly
Topic: Assembly3 preview
Replies: 1795
Views: 224191

Re: Assembly3 preview

Update: actually I found that wrapping each part in an assembly, then combining those into another assembly seemed to work nicely!
by Brutha
Wed Jan 30, 2019 9:48 am
Forum: Assembly
Topic: Assembly3 preview
Replies: 1795
Views: 224191

Re: Assembly3 preview

Hi All, Testing (and trying to find my way round A3!) on OSX. I wanted to use a angle constraint to pivot the two plates around a hinge (indicated by the red line). See attached file. The axial constraint works fine to link the two plates. The angle constraint gives an issue though, I just get the m...
by Brutha
Tue Jan 22, 2019 4:00 pm
Forum: Assembly
Topic: Assembly3 preview
Replies: 1795
Views: 224191

Re: Assembly3 preview

What you're doing is an equatorial mount for your camera to follow Earth's rotation ? That's very clever, good idea Yes, it's a homemade equatorial mount and it is clever indeed - but very far from being my idea! The link is just one I found on the net btw.... There are many variations on the basic...
by Brutha
Tue Jan 22, 2019 3:02 pm
Forum: Assembly
Topic: Assembly3 preview
Replies: 1795
Views: 224191

Re: Assembly3 preview

Do you really need a sphere? Can you not just constrain against a point at the top of the sphere? Yes, actually I'm sure that would be accurate enough to be honest, any difference will be far beyond my capability to accurate align the device anyway! I was just thinking that it might come in useful ...

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