Search found 27 matches

Go to advanced search

by Reynard1066
Fri Sep 18, 2020 4:26 pm
Forum: Help on using FreeCAD
Topic: how to multi-start thread
Replies: 8
Views: 243

Re: how to multi-start thread

Here is a simple 8mm 3D printer rod with 7 starts ISO trapezoid thread.

Cut 1 thread using subtractive pipe.
Polar array the rest.
Grove to chamfer the ends.

While FC crunches the number, go make yourself a cup of tea.
by Reynard1066
Sun Jul 12, 2020 4:14 pm
Forum: Help on using FreeCAD
Topic: How to cut off a corner?
Replies: 13
Views: 593

Re: How to cut off a corner?

Thanks drmarco,

That's a different method. Got rid of the Datum Plane.

None of my Datum Points in my original reply were attach to the model. I avoid topo issues like the plague.

Reynard
by Reynard1066
Sun Jul 12, 2020 2:01 pm
Forum: Help on using FreeCAD
Topic: How to cut off a corner?
Replies: 13
Views: 593

Re: How to cut off a corner?

Hi drmarco,

I created the Datum Points onto the XY-Plane. That way the local and world co-ordinates matched up.

Can't work out how to get the Sketcher to snap to the Datum Points to draw a triangle to pocket. Seems not possible.

Reynard
by Reynard1066
Sun Jul 12, 2020 1:37 pm
Forum: Help on using FreeCAD
Topic: How to cut off a corner?
Replies: 13
Views: 593

Re: How to cut off a corner?

Create 3 Datum Points at the co-ordinates you need.
Create a Datum Plate onto these 3 Datum Points.
Sketch a shape (Rectangle maybe) that encompasses the three Datum Points.
Pocket the shape in the correct direction. Probably reversed.
by Reynard1066
Tue Jul 07, 2020 2:50 pm
Forum: Help on using FreeCAD
Topic: [Solved] - Datum Planes - Reversed Hole Direction
Replies: 6
Views: 252

Re: [Solved] - Datum Planes - Reversed Hole Direction

Since we are on the subject of Plane direction, something that confuses me is that if I create a datum plane on the XZ world plane I would expect the datum plane normal (Z) to follow the remaining world (Y) but it does the opposite. There is probably a very good reason for this, like "it's too late ...
by Reynard1066
Tue Jul 07, 2020 2:15 pm
Forum: Help on using FreeCAD
Topic: [Solved] - Datum Planes - Reversed Hole Direction
Replies: 6
Views: 252

Re: [Solved] - Datum Planes - Reversed Hole Direction

Ahhhh! That Hole. I was thinking pocket.

Yes, a reverse check box would be nice to have.
by Reynard1066
Tue Jul 07, 2020 11:46 am
Forum: Help on using FreeCAD
Topic: [Solved] - Datum Planes - Reversed Hole Direction
Replies: 6
Views: 252

Re: Datum Planes - Reversed Hole Direction

As QUEEN would say, "Its a kind of magic".

Both Pocket and Datum Plane dialog boxes have a reverse check box in them. Experiment with them.

Reynard
by Reynard1066
Tue Jul 07, 2020 7:57 am
Forum: Help on using FreeCAD
Topic: Creating repeated holes through a sphere
Replies: 5
Views: 256

Re: Creating repeated holes through a sphere

Yes datum planes do seem like trial and error to see which way they move, but you work something out eventually.

I have been struggling to get the file size below the 1Mb mark. Using compression level 9 seemed to do it.

File attached.
by Reynard1066
Mon Jul 06, 2020 4:36 pm
Forum: Help on using FreeCAD
Topic: 3D Printed Model has blemish
Replies: 28
Views: 1184

Re: 3D Printed Model has blemish

Hi drmarco, Thank you for looking at this. You are correct the normals are all pointing inwards. I have done a recalculate to outside and will try again. I am a bit concerned that there may be a very small hole in the top centre that didn't close during the 360 spin. To be checked out. Again thank y...
by Reynard1066
Mon Jul 06, 2020 2:06 pm
Forum: Help on using FreeCAD
Topic: 3D Printed Model has blemish
Replies: 28
Views: 1184

Re: 3D Printed Model has blemish

The FC file is some 17Mb.

Attached is the STL file from Blender.

Go to advanced search