issue with 3d parallel on sinumerik 808D vmc
I have not used your control but I have a question, how does your control deal with arcs in the XZ and YZ planes, should it be using G18\19. I just posted your code using the generic 820 and 840 posts and the 820 uses G17/18/19 but they're missing from the 840 code.
Below 840 left 820 right. I have a Heidenhain control that doesn't use G17/18/19 for arc planes it just uses the coordinate on the arc line but you can only have 2 cords on a G2/3 line, you have 3, at the top of the code here you have X61.779 that seems unnesisery.
Mark
Mark Hughes
Owner, Hughes Tooling
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The problem you're seeing is very much like you'd get if the machine is using the XY plane (G17) when it should be using ZX or YZ (G18/19), the other parallel finish in the file is not across the arc but along the arc so just a straight line, the linking moves have some arcs but they might be small enough that you don't see the problem.
Mark
Mark Hughes
Owner, Hughes Tooling
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Can you hand code a simple toolpath along the X axis with an arc in the XZ plane to see what your control wants, or try the attached file. It has a simple trace toolpath with one arc try and see if you can figure out what the control needs.
Mark
Mark Hughes
Owner, Hughes Tooling
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Hi Chris,
Try removing the Y-20.65 as I don't think that's needed, edited code below. Try with and without G18 as well.
; %_N_1002CIP_MPF N10 ; T2 D=6 CR=3 - ZMIN=-27.781 - ball end mill N11 G90 G94 N12 G71 N13 G64 N14 G17 N15 G0 SUPA Z0 D0 M9 N16 ; Trace1 N17 M9 N18 T2 D1 N19 M6 N20 S8000 M3 N21 G57 N22 G0 X-29.777 Y-20.65 N23 G0 Z15 N24 M8 N25 G0 Z5 N26 G1 Z-27.753 F1440 N27 G1 X-12.75 Z-6.401 N28 G17 N29 G3 X14.15 Z-6.811 CR=17 N30 G1 X29.852 Z-27.781 N31 G1 Z5 N32 G0 Z15 N34 G0 SUPA Z0 D0 N35 G0 SUPA X-200 Y-5 D0 N36 M30
Mark
Mark Hughes
Owner, Hughes Tooling
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Here's an edited version of the 840 post, use with care. I've made it output only 2 coordinates on all G02/03 move, this will mean helical moves will be linearize. Were you able to do helical cuts in the XY plane with the standard post, if you were I can make another change so G02/03 moves work as before for XY.
If you just want to modify your post this is the new code, just search for "use radius mode" be careful with the brackets there should be one after this bit of code to end the onCircular function..
} else { // use radius mode
if (isHelical()) {
linearize(tolerance);
return;
}
var r = getCircularRadius();
if (toDeg(getCircularSweep()) > (180 + 1e-9)) {
r = -r; // allow up to <360 deg arcs
}
switch (getCircularPlane()) {
case PLANE_XY:
forceXYZ();
writeBlock(gMotionModal.format(clockwise ? 2 : 3), xOutput.format(x), yOutput.format(y), "CR=" + xyzFormat.format(r), getFeed(feed));
break;
case PLANE_ZX:
forceXYZ();
writeBlock(gMotionModal.format(clockwise ? 2 : 3), xOutput.format(x), zOutput.format(z), "CR=" + xyzFormat.format(r), getFeed(feed));
break;
case PLANE_YZ:
forceXYZ();
writeBlock(gMotionModal.format(clockwise ? 2 : 3), yOutput.format(y), zOutput.format(z), "CR=" + xyzFormat.format(r), getFeed(feed));
break;
default:
linearize(tolerance);
}
}
Mark
Mark Hughes
Owner, Hughes Tooling
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Not just that the helical check at the start will grab helical move before it gets that far. Try this.
} else { // use radius mode
var r = getCircularRadius();
if (toDeg(getCircularSweep()) > (180 + 1e-9)) {
r = -r; // allow up to <360 deg arcs
}
switch (getCircularPlane()) {
case PLANE_XY:
forceXYZ();
writeBlock(gMotionModal.format(clockwise ? 2 : 3), xOutput.format(x), yOutput.format(y), zOutput.format(z), "CR=" + xyzFormat.format(r), getFeed(feed));
break;
case PLANE_ZX:
if (isHelical()) {
linearize(tolerance);
return;
}
forceXYZ();
writeBlock(gMotionModal.format(clockwise ? 2 : 3), xOutput.format(x), zOutput.format(z), "CR=" + xyzFormat.format(r), getFeed(feed));
break;
case PLANE_YZ:
if (isHelical()) {
linearize(tolerance);
return;
}
forceXYZ();
writeBlock(gMotionModal.format(clockwise ? 2 : 3), yOutput.format(y), zOutput.format(z), "CR=" + xyzFormat.format(r), getFeed(feed));
break;
default:
linearize(tolerance);
}
}
Mark
Edit Update the code block, I'd missed a bit.
Mark Hughes
Owner, Hughes Tooling
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