Matt has added an Alternate DXF importer in the 'Alternate OpenSCAD Importer' workbench. The DXF files have INSERT tags and I therefore suspect not supported by the FreeCAD DXF importers (Old and current). Not sure if this works but I think this link should get to Mick's post. jlDmrBRQZoĪnd the files are available for non commercial use at thingivese The DXF files he is trying to use are at. He is trying to trying to create Spiral Bowls on his CNC router. If you have any problems with it just let me know.Mike Hocking posted a request in the FaceBook FreeCAD group. Hopefully will find this more convenient than using FreeCAD, and others will find it useful as well. I plan on making some improvements but I just wanted to get something usable out there as quickly as I could. You can save the SVG to a file or you can copy it to the clipboard where you can paste it directly into LB without having to save & import an SVG file. I’ve included this as it makes it easier to find the centre once imported or pasted into LB (or any other app you potentially use it with). The checkbox when checked will also draw two circles representing the min and max radii as well as lines from each endpoint back to the centre. I might revisit that at a later date if I’m looking for something to do! The arc based curve should be good enough for most purposes. The curve that’s generated uses circular arcs to approximate a proper spline as from what I’ve read it’s pretty complicated to do the latter. there isn’t much right now, but as long as you put sensible values in you should get sensible results. It’s crude as far as error checking is concerned - i.e. I think the app should be fairly self-explanatory.

The said cam will be fixed on the rhs of the fence. Oh yeah, that red coloured scribble is a spring. The importance of the cam is to adjust the distance between the router cutting head and the fence as shown in the pathetic images I created. The following images are crude to some extent and posted as such - it’s late here and if anyone is interested I’ll explain in more detail at a later date. The mask was applied to mirror-glass, weeded, sandblasted, painted and glue-chipped. The picture frames will house some artwork that I have created using a masking technique. The cam device will be used on a specialised router table to determine the distance required to route out the back of my hand-made picture frame moldings. This is not some sponsorship by LB, but just an example how “I” have used LB with my co2 laser.Īpologies for the crappish images which I’ll try to explain. I think it may be interesting to others to see how LB has been used in more than one way to achieve my final (almost) goal. I thought I may as well show how this “cam” is going to be used in context. If you are interested, I’ll post a couple of images of what, where, how and why this cam will be used. Ummm, I think I’ve gone mad thinking about it too much, and should just make the bloody thing!! If I think about drawing this manually, I would use a turntable with paper on top, running at a constant speed with a pencil drawn straight across from toward the centre to the outer edge, making sure the time one revolution matches the time the pencil moves. It may be of no consequence and maybe that’s just the way this type of cam has to be? In any case, this is about the level of my engineering know-how. If the pivot was directly aligned the the point it touches the table, then it would not move. This is because the pivot is to the left of the point where it touches the table. To clarify what I mean: With the image you drew, if this was sitting as a solid object on a flat table then you applied weight to the pivot/axel, the cam would tend to want to move to the left - and likely continue to do so. Not sure if that makes sense and if we a meaning the same thing

Generate spiral openscad