On Sunday 24 March 2013 23:19:10 Gregg Eshelman did opine: > --- On Sun, 3/24/13, Gene Heskett <[email protected]> wrote: > > JohnBannister did opine: > > > Whats potrace? > > > > potrace, by Peter Selinger, takes a bitmap image in several > > formats as > > input, in this case a 1 bit deep .pnm, and generates a > > smoothed, scalable > > vector .eps file thats typically 1% to 5% of the size of the > > src image. > > Then in just a few seconds, pstoedit gave me an outline > > trace in GCode that > > was in the 100 line range for size. > > Sounds like exactly the thing to make the parts I want to mill much > easier to get into computer land than painstakingly measuring and > CADding. > > Put the original on a scanner, scan at crazy high resolution then use > Photoshop to edit the image to feed to potrace. > I think crazy hi rez was 300 dpi. 75 was the next step down & that didn't feel to be enough IMNSHO :) I have the little handle pattern cut 1/4" into the brass, and have turned it over & now facing off the back, which when it gets to intersect the grooves of the handle, will let it fall to the table, in probably an hour from now.
But I did have a hell of a time with using G41, it refused to let me put in a width step that was less than mill diameter, 1/16th". Once I'd made long ramps out of those, and had readjusted the 0,0 points and the scaling about 50+ times, it worked well, so now I'm facing off the back till the part falls free. > Then use that outline to loft into 3D. The original item is 3/4" thick > with a thin extension on one end, with a rounded fillet for strength. > The back side of the original is hollowed out with some webs, die cast, > breaks often. Ya might wanna post some pix at various angles with a small ruler for scale on imagebin with a weeks expiry so we can see what it is. > I've been making spin cast Zamak copies but they also break, wasn't > things like FEA in the 1940's. I figure solid CNC milled aluminum or > steel should make the part indestructible, also much safer. I'm hoping this will be too. Its weak point will probably be the 0-80 screws holding it in place, 2 of them on about 0.3250" centers IIRC. Finding grade 12's in 0-80 can't be done. These look good, but are probably grade 3's at best. > ------------------------------------------------------------------------ > ------ Everyone hates slow websites. So do we. > Make your web apps faster with AppDynamics > Download AppDynamics Lite for free today: > http://p.sf.net/sfu/appdyn_d2d_mar > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users 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://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> Confession is good for the soul only in the sense that a tweed coat is good for dandruff. -- Peter de Vries I was taught to respect my elders, but its getting harder and harder to find any... ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_mar _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
