I guess it depends on the type of work you are doing. I see these types of tranforms being handled in the relm of the cad/cam application.
But for drill circles or other canned cycles I can see the utility. Perhaps I could have saved you some time over the weekend. I have already written a program the can rotate g-code. I have not tested it for all cases, but it has worked for the basic g-code that I do. I'll post a link to it as soon as I get it up on my website. ----- Original Message ----- From: "Andre' Blanchard" <[EMAIL PROTECTED]> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Sent: Monday, June 11, 2007 8:45 AM Subject: Re: [Emc-users] Rotation [Was] scaling G code > At 09:03 PM 6/8/2007, you wrote: >>Scaling g-code is easy. Rotating g-code is easy. >>But I'm not certain that it's the job of the interpreter to do such >>things. > True but the interpreter does need the commands to control the a rotation. > There are two very different types of rotation, first is programmed > rotation G68,G69 the second is parameter based rotation both have their > uses. > > Programmed rotation is the type of thing you use to make bolt hole > circles, > or within a sub that is run to cut some feature at many places on a part > and some or all of those places need to have that feature orientated > differently. It is all done under control of the G code program, and is > not in my experience active under manual control. > > Parameter based rotation is what you do when you can't align a fixture to > the physical machine axis, say there is some fixture on the machine that > you do not want to remove and the only way the new job will fit is if it > is > turned just a bit this way. You go into the machine parameters and setup > the rotation and the G code program has nothing to say about it. In > effect > you create a virtual machine coordinate system just like in Hex > machines. How to handle homing g28 g53 type commands is then the > question. > > >>Sometimes times you may only want to scale in X,Y but not touch Z. >>In addition, scaling on the machine could run into problems with >>interference with >>existing workpiece jigging. > > Not only that but there are time when you want to set different scales to > X, and Y. Program a 1" diameter circle then set the right X and Y scale > factors origined on the center of the circle and you can make nice > elliptical shapes of any needed size. > > Interference with existing fixturing is always a problem with new setups > but having more options available like scaling and rotation only makes it > easier to make any new fixturing work with existing stuff. > > > > Over the weekend I worked up a little work around for programmed rotation, > its not a replacement for g69 g68 but it seems to work well enough to be > useful. It is a sub program that you call in place of G0, G1, G2, G3 > commands, the first parameter sets which G code is run, if that code is -1 > then no G code is run but the rotation is calculated and the results > placed > in variables #502 - #506. > The main program is just a little demo that uses all the g commands. > > > > > > > O9000 Sub > (Make a move in a rotated coordinate system) > (Also return rotated X,Y,I,J values) > (Valid G codes 0 or 1 or 2 or 3 or -1) > ( If -1 the G code will not be executed) > ( but the rotated values will be put in) > ( parameters #501 - #506) > (Works for G17 plane only) > () > (Parameters passed in) > (#1 G code) > (#2 X Position) > (#3 Y Position) > (#4 Z Position) > (#5 I Distance) > (#6 J Distance) > (#7 F Feed rate) > (#8 Rotation angle) > (#9 X center of rotation relative to current work offset) > (#10 Y center of rotation relative to current work offset) > () > (Other local variables used) > (#30 New angle) > (#29 X side) > (#28 Y side) > (#27 H side) > (#11 --- #26 not used) > () > (Global variables return values) > (#501 X rotated) > (#502 Y rotated) > (#503 I rotated) > (#504 J rotated) > (#505 X current) > (#506 Y current) > (#507 Z current) > () > #8 = [#8 MOD 360] > () > (XY) > #29 = [#2 - #9] > #28 = [#3 - #10] > #30 = ATAN[#28] / [#29] > #27 = SQRT[[#29**2 + #28**2]] > #30 = [#30 + #8] > #501 = [[#27 * COS[#30]] + #9] > #502 = [[#27 * SIN[#30]] + #10] > (IJ) > #30 = ATAN[#6] / [#5] > #27 = SQRT[[#5**2 + #6**2]] > #30 = [#30 + #8] > #503 = [#27 * COS[#30]] > #504 = [#27 * SIN[#30]] > () > (Make move) > O1 IF [#1 EQ 1] > G#1 X#501 Y#502 Z#4 F#7 > O1 ELSE > O2 IF [[#1 EQ 2] OR [#1 EQ 3]] > G#1 X#501 Y#502 Z#4 I#503 J#504 F#7 > O2 ELSE > O3 IF [#1 EQ 0] > G#1 X#501 Y#502 Z#4 F#7 > O3 ELSE > O4 IF [#1 EQ -1] > (Do nothing) > O4 ELSE > (Invalid G code do nothing) > O4 ENDIF > O3 ENDIF > O2 ENDIF > O1 ENDIF > (Update current position) > (The current position is only needed by G2 and G3 moves) > (Assumes that last move was made by this sub) > (with the same rotation angle) > #505 = #2 (Update current X) > #506 = #3 (Update current Y) > #507 = #4 (Update current Z) > O9000 EndSub > > > > > (****************************************) > (** Main Program **) > (****************************************) > (Test rotation) > () > G0G17G20G40G49G80G90 > G92.1 > G92.2 > () > N1M1(FIRST TOOL) > (G0G53Z3) > G0G53Z0 > T5M6 > M1 > G0G90G54X0.000Y0.000 > S1000M3 > G43Z1.000H2(M8) > () > (Rotate arrows and offset) > #1 = [360/60] (Rotate angle Step) > #2 = 0.1 (Z) > #3 = 0.000 (X Center) > #4 = 0.000 (Y Center) > #5 = [[360/#1] + 1] (Counter) > #6 = 0 (Current angle) > #7 = 0.0 (X Offset) > #8 = 0.0 (Y Offset) > #505 = 0 (Preset current) > #506 = 0 (Preset current) > o9000 CALL [0] [0.000] [0.000] [#2] [0] [0] [0.0] [#6] [#3] [#4] > G1Z#2F20.0 > O1 WHILE [#5 GT 0] > o9000 CALL [0] [0.000+#7] [0.000+#8] [#2] [0] [0] [0.0] [#6] [#3] [#4] > o9000 CALL [1] [1.000+#7] [0.000+#8] [#2] [0] [0] [40.0] [#6] [#3] [#4] > o9000 CALL [2] [1.000+#7] [0.000+#8] [#2] [0.005] [0.000] [10.0] [#6] > [#3] [#4] > o9000 CALL [1] [0.900+#7] [-0.025+#8] [#2] [0] [0] [10.0] [#6] [#3] [#4] > o9000 CALL [3] [0.900+#7] [0.025+#8] [#2] [0] [0.025] [10.0] [#6] [#3] > [#4] > o9000 CALL [1] [1.000+#7] [0.000+#8] [#2] [0] [0] [10.0] [#6] [#3] [#4] > o9000 CALL [0] [0.000+#7] [0.000+#8] [#2] [0] [0] [0.0] [#6] [#3] [#4] > #5 = [#5 - 1] > #6 = [#6 + #1] > #2 = [#2 + 0.02] > O1 ENDWHILE > () > (Rotate arrows and offset) > #1 = [360/60] (Rotate angle Step) > #2 = 0.1 (Z) > #3 = 0.000 (X Center) > #4 = 0.000 (Y Center) > #5 = [[360/#1] + 1] (Counter) > #6 = 0 (Current angle) > #7 = 1.5 (X Offset) > #8 = 0.0 (Y Offset) > #505 = 0 (Preset current) > #506 = 0 (Preset current) > o9000 CALL [0] [0.000] [0.000] [#2] [0] [0] [0.0] [#6] [#3] [#4] > G1Z#2F20.0 > O2 WHILE [#5 GT 0] > o9000 CALL [0] [0.000+#7] [0.000+#8] [#2] [0] [0] [0.0] [#6] [#3] [#4] > o9000 CALL [1] [1.000+#7] [0.000+#8] [#2] [0] [0] [40.0] [#6] [#3] [#4] > o9000 CALL [2] [1.000+#7] [0.000+#8] [#2] [0.005] [0.000] [10.0] [#6] > [#3] [#4] > o9000 CALL [1] [0.900+#7] [-0.025+#8] [#2] [0] [0] [10.0] [#6] [#3] [#4] > o9000 CALL [3] [0.900+#7] [0.025+#8] [#2] [0] [0.025] [10.0] [#6] [#3] > [#4] > o9000 CALL [1] [1.000+#7] [0.000+#8] [#2] [0] [0] [10.0] [#6] [#3] [#4] > o9000 CALL [0] [0.000+#7] [0.000+#8] [#2] [0] [0] [0.0] [#6] [#3] [#4] > #5 = [#5 - 1] > #6 = [#6 + #1] > #2 = [#2 + 0.02] > O2 ENDWHILE > G0 Z1.000 > () > G0Z1.000M5 > G49 > (G0G53Z3M5) > G0G53Z0M5 > G0G53Y0 > M30 > > __________ > Andre' B. Clear Lake, Wi. > > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by DB2 Express > Download DB2 Express C - the FREE version of DB2 express and take > control of your XML. No limits. Just data. Click to get it now. > http://sourceforge.net/powerbar/db2/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
