I need help
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 From:  bemfarmer
7328.4 In reply to 7328.2 
I selected all the edges and extruded -3.0 mm.
The result is joined srf, not solid. (Due to problems per Michael)
Managed to do a Boolean Difference, but had to play around a bit...Not sure of exactly what I did...

- Brian

Edit, deleted attachment, as it must be a little flawed...
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 From:  Michael Gibson
7328.5 In reply to 7328.4 
Hi Brian, re: Joined srf instead of solid, that's going to be because of the self intersections, see my above post I think we were replying at the same time there.

- Michael
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 From:  Michael Gibson
7328.6 In reply to 7328.1 
Hi Dieter, so probably the easiest way to clean it up is to delete all the inner outlines and then rebuild them in MoI using MoI's own Construct > Offset command. MoI's curve offsetter will likely do a better job on those corner areas, it should probably get them all to be proper sharp corners rather than having little loops.

There are a few self intersections in the outer contour too though which will need to be cleaned up first, but there are fewer of these so it's probably an easier route, clean these up and then use Construct > Offset in MoI to build the other contour maybe at a slightly larger thickness though.

Here are the 3 areas that I found so far with self intersections in the outer contour, it's possible there may be more you need to zoom in a ways and move around and inspect it to make sure it's well formed:


- Michael

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Message 7328.7 deleted 22 Jan 2017 by BEMFARMER

Message 7328.8 deleted 22 Jan 2017 by BEMFARMER

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 From:  bemfarmer
7328.9 
My version, to be deleted in a few days :-)

What CNC program are you using?
I think Aspire would just need a png of the letter curves...

- Brian

EDITED: 22 Jan 2017 by BEMFARMER

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 From:  bemfarmer
7328.10 In reply to 7328.5 
Thank you Michael.

Is there a tool or script to discover self intersections?

- Brian
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 From:  Michael Gibson
7328.11 In reply to 7328.10 
Hi Brian,

> Is there a tool or script to discover self intersections?

No, not that I am aware of. There can be a slight visual cue that the curve can tend to look a bit darker in self intersection areas because places where curves are drawn more than one time will be slightly darker, it's subtle but that sometimes gives me a bit of a clue where to zoom in and examine more closely.

- Michael
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 From:  bemfarmer
7328.12 
Hi Dieter

Just thought that for a "Stamp," the mirror image may be appropriate.
If to, do positive 5mm and 3mm extrudes.
The client might not want to look in a mirror to read the letters... :-)

- Brian
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