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by mrdic
Fri Jun 30, 2017 12:52 am
Forum: Help on using FreeCAD
Topic: [SOLVED] How to bend sheet around an arbitrary axis?
Replies: 15
Views: 2244

Re: [SOLVED] How to bend sheet around an arbitrary axis?

In case it may help someone else, here is the final result using an Helix: Note: Helix must have: Pitch = 2*Pi*r, and Height = Pitch/2 I think that the height is Pitch/(360/α) where α is the bend angle, pitch/2 works for 180° bends. The edges that lead in to the helical section are at the helix ang...
by mrdic
Mon Jun 26, 2017 5:33 am
Forum: Help on using FreeCAD
Topic: [SOLVED] How to bend sheet around an arbitrary axis?
Replies: 15
Views: 2244

Re: How to bend sheet around an arbitrary axis?

A rolled or bent sheet with an arbitrary axis can be swept or lofted as a surface and offset with fill.
by mrdic
Wed Jun 07, 2017 4:35 am
Forum: Help on using FreeCAD
Topic: Filleting STL object
Replies: 2
Views: 376

Re: Filleting STL object

This is a faceted part, and the "fillet" on the top edge is a series of bevels, not curved surfaces. I think that the easiest way to put a similar multi-beveled edge on the base is to copy the part, trim the top edge and fit the trimmed edge to the base of the original.
by mrdic
Thu May 25, 2017 1:02 pm
Forum: Help on using FreeCAD
Topic: Help creating a gear?
Replies: 7
Views: 1938

Re: Help creating a gear?

If you've got the axle mounting of the gear pair to work from, it's easier to work out the PCDs from the distance between their axles' centres (which is easier to physically measure) and the gearset's ratio than from the gears themselves. The PCDs touch at the ratio distance between the axle centres.
by mrdic
Wed May 24, 2017 9:32 pm
Forum: Help on using FreeCAD
Topic: Help creating a gear?
Replies: 7
Views: 1938

Re: Help creating a gear?

Pitch circle is the diameter of the gear pair's contact point. If PCDs overlap or don't contact, the gears' teeth slide and wear against each other instead of rolling.
by mrdic
Mon May 15, 2017 5:10 am
Forum: Help on using FreeCAD
Topic: STL file trouble
Replies: 4
Views: 605

Re: STL file trouble

There's a dirty way to make a solid from what you've got, although as NormandC has pointed out, there's no trailing edge to this wing: Make part|shape from the .stl, the shape mesh can be trimmed by a solid, for your wing I intersected the wing with a cube that enclosed the lower surface. That resul...

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