I was asked to modify an STL by adding numbers sunk into it. The STL is to be cut with a CNC router. Since I am really not sure how to make numbers that are made with the bottoms in a V-shape, I am wondering if I can just extrude the numbers normally, sink then into position, and tell the guy to use a V-bit for that part. If that will work, how deep will the V-bit cut? I assume it will cut so the point will be coincident with the bottom of the digits, but I really don't know. If there is a way to extrude text to do the job, I'd welcome hearing how. Thanks.

There's a new-ish experimental feature called roof() that does exactly what you want from a 2D shape. I think you could have a challenge that perhaps not all the bits that make up a polygon are going to be exactly the same width, then they won't be the same depth using the roof() cmd. roof() must be enabled in preferences. Dan On Wed, Sep 18, 2024 at 10:17 AM larry via Discuss < discuss@lists.openscad.org> wrote: > I was asked to modify an STL by adding numbers sunk into it. The STL is > to be cut with a CNC router. > > Since I am really not sure how to make numbers that are made with the > bottoms in a V-shape, I am wondering if I can just extrude the numbers > normally, sink then into position, and tell the guy to use a V-bit for > that part. > > If that will work, how deep will the V-bit cut? I assume it will cut so > the point will be coincident with the bottom of the digits, but I > really don't know. > > If there is a way to extrude text to do the job, I'd welcome hearing > how. > > Thanks. > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >

It's just not a case of cutting the shape with a v bit at constant depth,  because you will get rounded corners. On 18/09/2024 18:16, larry via Discuss wrote: > I was asked to modify an STL by adding numbers sunk into it. The STL is > to be cut with a CNC router. > > Since I am really not sure how to make numbers that are made with the > bottoms in a V-shape, I am wondering if I can just extrude the numbers > normally, sink then into position, and tell the guy to use a V-bit for > that part. > > If that will work, how deep will the V-bit cut? I assume it will cut so > the point will be coincident with the bottom of the digits, but I > really don't know. > > If there is a way to extrude text to do the job, I'd welcome hearing > how. > > Thanks. > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org

On Wed, 2024-09-18 at 21:15 +0100, Raymond West via Discuss wrote: > It's just not a case of cutting the shape with a v bit at constant > depth,  because you will get rounded corners. Right. Never thought of that, but I think rounded corners, as well as ends of lines, will be OK. I think I'll just wait and see what the fellow tries, and go from there. That new roof() looks promising. I like it a lot, and it's been something I've wanted for quite some time, specifically for text.. I do think it needs at least one more argument (height of roof) and the ability to use a negative roof to avoid fiddling with mirror and rotate to get something that can be sunk in. Hmm... another argument could be useful; chamfered or rounded ends of text for 3D printing. > On 18/09/2024 18:16, larry via Discuss wrote: > > I was asked to modify an STL by adding numbers sunk into it. The STL is > > to be cut with a CNC router. > > > > Since I am really not sure how to make numbers that are made with the > > bottoms in a V-shape, I am wondering if I can just extrude the numbers > > normally, sink then into position, and tell the guy to use a V-bit for > > that part. > > > > If that will work, how deep will the V-bit cut? I assume it will cut so > > the point will be coincident with the bottom of the digits, but I > > really don't know. > > > > If there is a way to extrude text to do the job, I'd welcome hearing > > how. > > > > Thanks. > > _______________________________________________ > > OpenSCAD mailing list > > To unsubscribe send an email to discuss-leave@lists.openscad.org > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >

On Wed, 2024-09-18 at 10:32 -0700, Dan Perry via Discuss wrote: > There's a new-ish experimental feature called roof() that does > exactly what you want from a 2D shape.  I think you could have a > challenge that perhaps not all the bits that make up a polygon are > going to be exactly the same width, then they won't be the same depth > using the roof() cmd. > roof() must be enabled in preferences. > Dan Thanks for the pointer! I did not realize it was there. See my respnse to Raymond for comments on it. > On Wed, Sep 18, 2024 at 10:17 AM larry via Discuss > <discuss@lists.openscad.org> wrote: > > I was asked to modify an STL by adding numbers sunk into it. The > > STL is > > to be cut with a CNC router. > > > > Since I am really not sure how to make numbers that are made with > > the > > bottoms in a V-shape, I am wondering if I can just extrude the > > numbers > > normally, sink then into position, and tell the guy to use a V-bit > > for > > that part. > > > > If that will work, how deep will the V-bit cut? I assume it will > > cut so > > the point will be coincident with the bottom of the digits, but I > > really don't know. > > > > If there is a way to extrude text to do the job, I'd welcome > > hearing > > how. > > > > Thanks. > > _______________________________________________ > > OpenSCAD mailing list > > To unsubscribe send an email to discuss-leave@lists.openscad.org > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org