On Monday, September 12, 2011 05:10:01 PM Kirk Wallace did opine: > I would like to mill some 3D surfaces (violin plates) but I need a means > to go from a paper plan to g-code. I have Synergy with 3D, but I would > prefer to use a free and open solution. Heeks looks promising but > doesn't look like it is ready for general consumption yet. It looks to > me like I should be able to use a few key points such as a set of 2D > curve end and center points plus some sort of curve fitting algorithm to > come up with the intermediate points on the curve. I looked at Bezier > and NURBS curves, but from my brief look at them, it looks like the > curves only go through the known end points and not through known way > points. Is there a curve type I should look at? Or, even better, is some > one machining 3D curves appropriate for instrument making or boat hulls > and would like to share how it is generally done?
I would join in this request, because gunstocks are also in 3d. Solutions to a set shape on one end, and a set shape on the other, such that the 3d cross section could become a series of cuts, straight line or curved, from a given point of one ends profile to the same tangent point on the other end would be helpful, as would methods to carve the semi-teardrop shapes of a cheekpiece, not exactly a 'Monte Carlo' because the thumbhole buttstock is generally a straighter line, often requiring clearance grooves for the bolt to cycle. Likewise the top right edge of the cheekpiece will need relieved to make room for the earmuff, otherwise it tends to lift the right cup off the ear letting the pressure wave in that the muff should withhold 30 db of. So its a matter of hitting the artistic looks in addition to the practical aspects of clearing the earmuff so it works well too. I did carve the rear profile of the thumbhole in the last stock on the mill, but found it very difficult to hit the curves of the recoil pad shape on one end, to the exit on the other side where ones thumb comes out. It doesn't look too bad, but I probably have 2 to 3 hours an evening for 15 days running doing it, when with the right math background I'll never have, I expect it would not have exceeded 3 hours runtime for that whole 'section' of the stock. Cheers, gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://204.111.66.235:85/gene/> You never know what is enough until you know what is more than enough. -- William Blake ------------------------------------------------------------------------------ Doing More with Less: The Next Generation Virtual Desktop What are the key obstacles that have prevented many mid-market businesses from deploying virtual desktops? How do next-generation virtual desktops provide companies an easier-to-deploy, easier-to-manage and more affordable virtual desktop model.http://www.accelacomm.com/jaw/sfnl/114/51426474/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
