On 16 Apr 2009 at 19:19, alan battersby wrote:
> Hello everyone, > I hope someone on this forum can offer some advice. I asked this > question on CNCZone Gcode programming but have not yet had a > reply. > Perhaps I didnt word it clearly enough so can anyone on this forum > help? As Steve pointed out the Zone is not the best place to reach the EMC community. This is the top of the list. > > I am in the process of building a cnc setup onto my wood lathe, > to > hopefully cut patterns onto bowls see (http://imagebin.org/45774). I > am using emc > to control the steppers. At the same time as this I am developing > software to generate the gcode to cut the paths (see You might get some benefit from the g code generators at the wiki page: http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Simple_EMC_G-Code_Generators > http://imagebin.org/45775), there may be many paths > in a design. Paths probably will be wider than the milling tool used > and > deeper than the maximum allowable cut per pass. Therefore I am > placing > the code to cut a path inside a double loop. The outer loop will > take > care of the width and the inner loop will take care of cutting to > depth. I suppose that I am cutting a long narrow pocket so cut > full > width to common depth then deepen or the other way round? Is one > way > better than the other so far as machining is concerned? > Expanding this question to many paths - Is it considered better > practice > to cut all paths to the same common depth / width before looping to > the > next depth / width value, or is it better to cut each path > individually > to its finished width / depth before moving onto the next path. Or > does > it not matter at all. It would depend on heat build up and chip evacuation and possibly material warping from deep cuts... practice on scrap wood first :) A little loc-line with air blowing on the cutter could help with cooling and chip removal. When I'm milling deep slots I stand by and use a vacuum to remove the chips on a multi pass slot if the air does not blow them out. > > You will gather from my questions that I have no experience in > milling > (yet), this is a non-commercial retirement hobby project. I was an > engineering apprentice 40+ years ago and did some then, but have > spent > the last 25+ years in computing. > > Hope that someone here will offer an opinion and I apologize in > advance > if you think this post is off topic. > > Alan > > > -------------------------------------------------------------------- > ---------- > Stay on top of everything new and different, both inside and > around Java (TM) technology - register by April 22, and save > $200 on the JavaOne (SM) conference, June 2-5, 2009, San > Francisco. > 300 plus technical and hands-on sessions. Register today. > Use priority code J9JMT32. http://p.sf.net/sfu/p > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Stay on top of everything new and different, both inside and around Java (TM) technology - register by April 22, and save $200 on the JavaOne (SM) conference, June 2-5, 2009, San Francisco. 300 plus technical and hands-on sessions. Register today. Use priority code J9JMT32. http://p.sf.net/sfu/p _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
