create slot with profile / so many lines instead of I J K style

[turbothis]

not sure how to word this
i am doing a .500" diameter profile straight slot into the part. only .050" deep though
seems like it should output a 2 line K style command instead of a hundred + lines
maybe the post process is doing this?




N6X-4.8705Y-0.1594Z0.0F1.0
N7G01X-4.8724Y-0.1596Z-0.0015
N8X-4.8744Y-0.1599Z-0.0029
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N10X-4.8784Y-0.1605Z-0.0057
N11X-4.8804Y-0.1608Z-0.0071
N12X-4.8824Y-0.1611Z-0.0085
N13X-4.8844Y-0.1614Z-0.0098
N14X-4.8864Y-0.1617Z-0.0111
N15X-4.8885Y-0.162Z-0.0124
N16X-4.8906Y-0.1623Z-0.0137
N17X-4.8926Y-0.1626Z-0.015
N18X-4.8947Y-0.1629Z-0.0162
N19X-4.8968Y-0.1632Z-0.0174
N20X-4.8989Y-0.1635Z-0.0186
N21X-4.9011Y-0.1638Z-0.0198
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N24X-4.9075Y-0.1647Z-0.0232
N25X-4.9097Y-0.165Z-0.0243
N26X-4.9119Y-0.1653Z-0.0254
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N28X-4.9163Y-0.166Z-0.0275
N29X-4.9185Y-0.1663Z-0.0285
N30X-4.9207Y-0.1666Z-0.0295
N31X-4.9229Y-0.1669Z-0.0304
N32X-4.9252Y-0.1672Z-0.0314
N33X-4.9274Y-0.1676Z-0.0323
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N37X-4.9365Y-0.1689Z-0.0357
N38X-4.9388Y-0.1692Z-0.0365
N39X-4.9411Y-0.1695Z-0.0373
N40X-4.9434Y-0.1699Z-0.0381
N41X-4.9457Y-0.1702Z-0.0388
N42X-4.948Y-0.1705Z-0.0395
N43X-4.9503Y-0.1709Z-0.0402
N44X-4.9527Y-0.1712Z-0.0409
N45X-4.955Y-0.1715Z-0.0415
N46X-4.9573Y-0.1719Z-0.0421
N47X-4.9597Y-0.1722Z-0.0427
N48X-4.9621Y-0.1726Z-0.0433
N49X-4.9644Y-0.1729Z-0.0439
N50X-4.9668Y-0.1732Z-0.0444
N51X-4.9692Y-0.1736Z-0.0449
N52X-4.9715Y-0.1739Z-0.0454
N53X-4.9739Y-0.1743Z-0.0458
N54X-4.9763Y-0.1746Z-0.0463
N55X-4.9787Y-0.175Z-0.0467
N56X-4.9811Y-0.1753Z-0.0471
N57X-4.9835Y-0.1756Z-0.0474
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N59X-4.9883Y-0.1763Z-0.0481
N60X-4.9907Y-0.1767Z-0.0484
N61X-4.9931Y-0.177Z-0.0486
N62X-4.9955Y-0.1774Z-0.0489
N63X-4.9979Y-0.1777Z-0.0491
N64X-5.0004Y-0.1781Z-0.0493
N65X-5.0028Y-0.1784Z-0.0495
N66X-5.0052Y-0.1788Z-0.0496
N67X-5.0076Y-0.1791Z-0.0497
N68X-5.01Y-0.1795Z-0.0498
N69X-5.0125Y-0.1798Z-0.0499
N70X-5.0149Y-0.1802Z-0.05
N71X-5.0165Y-0.1804
N72X-5.0189Y-0.1807
N73X-5.0213Y-0.1811Z-0.0499
N74X-5.0237Y-0.1814Z-0.0498
N75X-5.0262Y-0.1818Z-0.0497
N76X-5.0286Y-0.1821Z-0.0496
N77X-5.031Y-0.1825Z-0.0494
N78X-5.0334Y-0.1828Z-0.0492
N79X-5.0358Y-0.1832Z-0.049
N80X-5.0383Y-0.1835Z-0.0488
N81X-5.0407Y-0.1839Z-0.0485
N82X-5.0431Y-0.1842Z-0.0483
N83X-5.0455Y-0.1846Z-0.048
N84X-5.0479Y-0.1849Z-0.0477
N85X-5.0503Y-0.1853Z-0.0473
N86X-5.0527Y-0.1856Z-0.0469
N87X-5.0551Y-0.186Z-0.0465
N88X-5.0575Y-0.1863Z-0.0461
N89X-5.0598Y-0.1867Z-0.0457
N90X-5.0622Y-0.187Z-0.0452
N91X-5.0646Y-0.1873Z-0.0447
N92X-5.067Y-0.1877Z-0.0442
N93X-5.0693Y-0.188Z-0.0437
N94X-5.0717Y-0.1884Z-0.0431
N95X-5.0741Y-0.1887Z-0.0425
N96X-5.0764Y-0.189Z-0.0419
N97X-5.0787Y-0.1894Z-0.0413
N98X-5.0811Y-0.1897Z-0.0406
N99X-5.0834Y-0.19Z-0.04
N100X-5.0857Y-0.1904Z-0.0393
N101X-5.0881Y-0.1907Z-0.0385
N102X-5.0904Y-0.191Z-0.0378
N103X-5.0927Y-0.1914Z-0.037
N104X-5.095Y-0.1917Z-0.0362
N105X-5.0972Y-0.192Z-0.0354
N106X-5.0995Y-0.1924Z-0.0346
N107X-5.1018Y-0.1927Z-0.0337
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N127X-5.1452Y-0.1989Z-0.012
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N129X-5.1492Y-0.1995Z-0.0094
N130X-5.1513Y-0.1998Z-0.008
N131X-5.1533Y-0.2001Z-0.0066
N132X-5.1553Y-0.2004Z-0.0052
N133X-5.1573Y-0.2007Z-0.0038
N134X-5.1592Y-0.201Z-0.0024
N135X-5.1612Y-0.2013Z-0.001
N136X-5.1625Y-0.2014Z0.0
N137G00Z0.5

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[turbothis]

this might be clearer

[awerby]

It looks like your slot isn't exactly orthogonal, in relationship to the workpiece. That's why the numbers are varying in X, Y and Z.

[turbothis]

hmmm, just tried a X plane only slot and the same hundred lines of code....

[Jim Dawson]

Sorry, it's not very clear in either example.

But the code seems reasonable if I understand what you're doing.

[turbothis]

i know it is hard to be very accurate with the words
in a X Y plane there can be 2 lines of code to make an arc
is there not the same thing for a Z plane arc?

[Jim Dawson]

It's pretty common for a post processor to create code like that for other than just an arc, even though the shape seems to be an XZ plane arc. If the CAM software is doing it's job correctly, it is also compensating for where the endmill is contacting the work, and thus would not be a true arc.

[turbothis]

i have a diameter of .005 in the tool definition

[Jim Dawson]

After looking at the G code again, That arc is on a diagonal line so 3 axes are in continuous motion, there is no way to simultaneously move in a G17 (XY plane) and a G18 (XZ plane) or a G19 (YZ plane), one or the other, not both. The only way to generate that shape is the way the post processor did it, because it a simultaneous 3 axis move.

[turbothis]

gotcha
my brain was stuck on there being like 2 lines of code
X x.xxx Y y.yyy Z -z.zzz K something something.....

do you have an example line of code for a radius down/infeed and then up? assuming a point and not a flat end mill

[Jim Dawson]

gotcha
my brain was stuck on there being like 2 lines of code
X x.xxx Y y.yyy Z -z.zzz K something something.....

do you have an example line of code for a radius down/infeed and then up? assuming a point and not a flat end mill

Here is a G18 move to create a XZ arc. This is a convex arc, but the same principle applies, there is no Y movement, only X and Z

G18
G1 X0.75 Z-0.1112 F5.
G2 X0.5449 Z0.0144 I-0.3906 K-0.2145

[turbothis]

i see
so you can only move 2 plains at once. other wise it is a bunch of small vector tolerance 3d moves?

[Jim Dawson]

i see
so you can only move 2 plains at once. other wise it is a bunch of small vector tolerance 3d moves?

As far as I know that is correct. It's not unusual for me to run thousands of lines of short vector moves. A true arc in two planes will do a G3 or G2 move.

[andre-dolphin]

Hello,

Yes, you can't use I J K if the slot is not parallel to either the X or Y axes.

What you can do to cut down the number of line vectors is to use the Vector tolerance setting on the Slot tab of the Z Profile command, setting the number to a larger value will reduce the number of line segments output by the post processor.

ATB
Andre

[deadlykitten]

there is no way to simultaneously move in a G17 (XY plane) and a G18 (XZ plane) or a G19 (YZ plane), one or the other, not both.

hello, just saw this some cncs can handle tilted arches; such an option can be called 3d circular interpolation

another aproach, is to take a normal xy arch for example, and apply a 3d coordinate conversion ( scale, rotation, translation, mirror, etc )

last, but not least, all those 100+ lines from initial post, may be executed by the cnc, in something like 1/2/3/very few lines : entire code read-ahead and aproximated within a tolerance

all above are cnc solutions

---

for software solutions, seeing andre-dolphin in here, he will more than likely provide a quick tip

[turbothis]

i like the sound of this

" take a normal xy arch for example, and apply a 3d coordinate conversion ( scale, rotation, translation, mirror, etc )"