Issue with helix ramp
All,
I've attached some code, post config file, and fusion model. Here's a screenshot showing the simple model and helix path.
I got this post from another guy (bighouse) on here that has the same control. I believe he mentioned he had helix issues as well.
Any help is appreciated...or lead me to someway to learn how to modify the post config file myself. I've done a bit of programming in Python if that helps my cause.
Thanks for those examples - I think I have it solved for you.
Fusion is outputting the ramp as a series of circular arcs, as you can see in the toolpath view:
Your post was picking these up with the onCircular() function, but just treating them as regular flat arc in XY only. I've modified the function so it checks if the movement is helical and if so uses G22/23 and includes all three XYZ values, if not it outputs G2/G3 with XY only as before. I've made the same change for PLANE_ZX and PLANE_YZ moves.
switch (getCircularPlane()) {
case PLANE_XY:
gMotionModal.reset();
writeBlock(gPlaneModal.format(17));
if(isHelical()){
writeBlock(gMotionModal.format(clockwise ? 22 : 23), xOutput.format(x), yOutput.format(y), zOutput.format(z), iOutput.format(cx, 0), jOutput.format(cy, 0), getFeed(feed));
} else {
writeBlock(gMotionModal.format(clockwise ? 2 : 3), xOutput.format(x), yOutput.format(y), iOutput.format(cx, 0), jOutput.format(cy, 0), getFeed(feed));
}
break;A comparison of the old code (left) and code from the modified post (right):
Looks like line 29 is a full planar circle - not sure if your control will accept that line or if it needs further work.
Modified post is attached for you to test out, see how you go with it.
Not sure that's going to work. Looking at page 18-5 in the manual for helical moves in the XY plane you need K to specify the pitch of the helix. The example on that page is
G92 Z0.25
G90
G01 X0.0 Y2.0 F10.
G22 I1.0 J2.0 Z-1.0 K0.25
X1.0 Y2.0
Not sure if the X1.0Y2.0 at the end is a G01 move to the centre but the G22 line is for about 5 turns using a 0.25 pitch.
Mark
Mark Hughes
Owner, Hughes Tooling
Did you find this post helpful? Feel free to Like this post.
Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.
Matt,
Thank you so much for trying, but it didn't work. I think Mark is right per the manual.
It looks like I and J are the X and Y coordinates of the center of the helix, and must be used in the XY plane.
K is the pitch, and Z is the total height of the helix... so if you have a K=0.25 and a Z=1.0, you would end up with a helix with 4 revolutions. The location of the machine prior to the G22/23 block defines the radius of the helix.
My concern looking at the example in the manual was the G92 at the start, not sure if it's necessary and if it is I don't know if you'd need to cancel it. Seems odd you'd move to a Z height then need a G92 with the same height.
If the code above does work, something you could look at is changing the maximum circular sweep in the post and you'd get one helix instead of several like the example above. Maximum circular sweep is normally set to 180° so if you change it to get more efficient helixes you will need to make sure you deal with what happens with full circles. For my Anilam control I just commented out the maximumCircularSweep line.
//maximumCircularSweep = toRad(1800);
Mark
Mark Hughes
Owner, Hughes Tooling
Did you find this post helpful? Feel free to Like this post.
Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.
@matty.fuller wrote:
Only thing I'm not sure of there is for ZX and YZ planes, which of IJK correlate to XYZ - the manual you provided only states which defines the pitch, not which is X and Y. That said, I don't think Fusion will give you helices on any plany other than YZ at the moment, but I'm not sure. Proceed with caution 🙂
The picture in post #8 gives detail of how to deal with G18/19 arcs. I did asked in the CAM forum if Fusion can generate helices in ZX and YZ but never got an answer. I think I got it correct in my post but couldn't come up with anything that used the other planes.
Mark
Mark Hughes
Owner, Hughes Tooling
Did you find this post helpful? Feel free to Like this post.
Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.
Thank you Matt!
However, this post didn't work either. I'm getting the same circle error, which I think is because you have X and Y values in the G22/23 block.
I think it just needs I, J, K, and Z.
I think the table just needs to be positioned to the XY starting point of the helix right before the helix move...outside of the G22/23 block.
Shouldn't these XY values always be exactly the same?
-Mike
The maximum sweep is set to 365° for some reason, that's why the XY are different on each line. If the format's correct you should only need one line, something like this
G0 X2.2321 Y1.5504 G0 Z0.6 Z0.2 Z0.152 G1 Z0.102 F10.
G23 Z-0.73 I2. J1.5 K0.0521
G3 I2. J1.5 G1 X2.2377 Y1.5133 F20.
Mark
Edit, Might need the IJ before the Z depends how fussy the control is.
Mark Hughes
Owner, Hughes Tooling
Did you find this post helpful? Feel free to Like this post.
Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.
Thanks Mark!
Also, I'm positive we cannot have X and Y values in the G22/23 blocks when we are in G17 (XY plane)
Give this post a try, I set the max sweep to 1000000, and sorted the format. Test carefully
Mark
Quick Edit. It will be interesting to see if the full circle at the bottom of the helix works correctly. Next test might be a 2 level pocket.
;1 ;(Tool4 D=0.5 - flat end mill) G90 G17 S1600 M3 G0 X2.2321 Y1.5504 G0 Z0.6 Z0.2 Z0.152 G1 Z0.102 F10. G23 I2. J1.5 Z-0.73 K0.0521 G3 X2.2375 Y1.5 I2. J1.5 G1 X2.2377 Y1.5133 F20.
Test the post carefully and I'd better add this
The accompanying advice and or non-standard post processor is provided as-is and without warranty of any kind, and usage is at the user’s own risk.
Do not put custom posts in the generic posts folder. Use the personal folder. or another location.
Fusion 360 CAM Personal Posts Folder Locations
_______________________________________________________________________________
Microsoft Windows:
%appdata%\Autodesk\Fusion 360 CAM\Posts
Mac / Apple / OSX:
/Users/<user id>/Autodesk/Fusion 360 CAM/Posts
Mark Hughes
Owner, Hughes Tooling
Did you find this post helpful? Feel free to Like this post.
Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.
Please download again I noticed the format was wrong for G18/G19, might not matter as I'm not sure Fusion can use them for a helix. I updated the version to v21 and removed the post processor from my other post.
Test the post carefully and I'd better add this
The accompanying advice and or non-standard post processor is provided as-is and without warranty of any kind, and usage is at the user’s own risk.
Do not put custom posts in the generic posts folder. Use the personal folder. or another location.
Fusion 360 CAM Personal Posts Folder Locations
_______________________________________________________________________________
Microsoft Windows:
%appdata%\Autodesk\Fusion 360 CAM\Posts
Mac / Apple / OSX:
/Users/<user id>/Autodesk/Fusion 360 CAM/Posts
Mark
Mark Hughes
Owner, Hughes Tooling
Did you find this post helpful? Feel free to Like this post.
Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.
To try and help with the adaptive problem try enabling Smoothing in the op, you might be struggling with block processing.
Next test should be arcs in the G18/19 planes, try the attached file. I've enabled smoothing in all the ops.
Looks good backploted with NC Corrector,
Mark
Mark Hughes
Owner, Hughes Tooling
Did you find this post helpful? Feel free to Like this post.
Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.
