Hi Andy,
> -----Original Message----- > From: andy pugh [mailto:bodge...@gmail.com] > Sent: April 10, 2024 1:54 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Carving a spiral > > On Wed, 10 Apr 2024 at 06:59, John Dammeyer <jo...@autoartisans.com> > wrote: > > > > > Without using G2 or G3 it's really just a triangle isn't it? Move rotary > > table distance A and move X axis distance A'. Do it in small enough > > increments and you get a spiral. But I feel like I'm missing something > > really simple. > > > If there is a rotary table, then if he wanted a 10 turn spiral at 6mm pitch: > > G1 F100 A3600 Z60 I can see with your mill how the tool sticks out horizontal so Z moves along the spiral. On my system Z would be depth of the spiral with the rotary table surface horizontal so I believe I'd have to move X. I'll give it a try. > > Should be all that is needed. > > Without a rotary table getting a true spiral is a bit more difficult as the > radius of curvature continually changes, not something that G2 and G3 > support. > I just experimented with polar coordinates, but those only make > straight-line moves between endpoints. > You can get close with arcs that are set up to be tangent to each other. > I'll give that a try. Here's the G-Code for simple G03 Arcs. I'll try a piece of MDF in the router later today and give it a try. G00 G49 G40.1 G17 G80 G50 G90 G20 (2 1/2 Axis Profiling) M6 T2 M03 S2000 G00 Z0.2362 X1.9541 Y-0.2875 G01 Z-0.0394 F6.9 X1.9431 Y-0.0378 F3.4 G17 G03X-0.9159Y1.5406I-1.8761J-0.0197 X-0.8023Y-1.5842I0.9413J-1.5302 X1.6952Y0.1276I0.7916J1.5228 X-0.9227Y1.2481I-1.6261J-0.1807 X-0.4850Y-1.4614I0.9422J-1.2379 X1.4359Y0.2432I0.4780J1.3960 X-0.9295Y0.9243I-1.3645J-0.2907 X-0.2234Y-1.2839I0.9422J-0.9157 X1.1298Y0.4190I0.2223J1.2124 X-0.8954Y0.5843I-1.0567J-0.4575 X0.0243Y-1.0653I0.8997J-0.5796 X0.8182Y0.4888I-0.0176J0.9888 X-0.7397Y0.3786I-0.7459J-0.5226 X0.0233Y-0.8290I0.7429J-0.3755 X0.6610Y0.2987I-0.0186J0.7546 X-0.5013Y0.3238I-0.5887J-0.3349 X-0.0334Y-0.5933I0.5078J-0.3188 X0.4767Y0.1441I0.0350J0.5209 X-0.2823Y0.2285I-0.4046J-0.1840 X-0.0458Y-0.3561I0.2918J-0.2221 X0.2713Y0.0272I0.0449J0.2857 X-0.0860Y0.0982I-0.1995J-0.0694 X-0.0295Y-0.1213I0.0991J-0.0915 X0.0557Y-0.0585I0.0246J0.0558 G00 Z0.2362 M5 M9 M30 John > -- > atp > "A motorcycle is a bicycle with a pandemonium attachment and is designed > for the especial use of mechanical geniuses, daredevils and lunatics." > � George Fitch, Atlanta Constitution Newspaper, 1912 > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
