I do this using VisualMill 6.0. I generate the text I want at the text height I want (Y), then scale in the (X) direction so it is 360.0 units wide. I use a special "post" to swap X with A.
-----Original Message----- From: Marcus Bowman [mailto:marcus.bow...@visible.eclipse.co.uk] Sent: Monday, 4 November 2013 7:33 PM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] Scale ring engraving On 2 Nov 2013, at 16:03, Jon Elson wrote: > andy pugh wrote: >> On 2 November 2013 08:53, Steve Blackmore <st...@pilotltd.net> wrote: >> >> >>> Can't you set A as a linear axis in LinuxCNC ? >>> >> >> You can't set the active plane to XA. >> You can have a linear A-axis, but the only planes that arcs can be in >> are XY, YZ, ZX, UV, VW, WU. >> > Right, so making a special config that drives the rotary axis from X > or Y would be the way to go. I suppose you could make the A axis > drive the "missing axis" so you could position the work under the spindle. > Then, once the spindle was exactly over the rotary axis centerline, > you wouldn't move it again. > > So, it would just require a special config file with the A and Y > swapped on the motion output. > Ok; I have done this on more than one occasion. Here's how I did it: First, I am using a font describable using only X and Y linear moves, so I am not using G2 or G3 commands. The work is a cylinder held in a chuck on the A axis, projecting horizontally along the X axis. The diameter of the cylinder is D, so the circumference is pi * D which is a linear distance wrapped around the X axis, but if unwrapped would be a linear Y distance. Translate Y onto A by proportion: 360 degrees / circumference = translation factor (call it TF) In the program, change all Y references to A and multiply all former Y values by TF. In my case, D=34.4 Circumference = 108.069 TF = 360/108.069 = 3.3312 So a move like G1 X0.984 Y-0.921 becomes G1 X0.984 A[3.3312 * -0.921] Works beautifully. http://www.cncintheworkshop.com/Wrapped_rotary_scale_engraving.html Marcus > Jon > > ---------------------------------------------------------------------- > -------- Android is increasing in popularity, but the open development > platform that developers love is also attractive to malware creators. > Download this white paper to learn more about secure code signing > practices that can help keep Android apps secure. > http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.c > lktrk _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ---------------------------------------------------------------------------- -- Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
