I Guess Solved ....Circle hole glitch

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CVH
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Re: Circle hole glitch

Post by CVH » Sat Mar 18, 2023 8:32 am

Where many CNC simulators seems to fail ...

AirManifoldMount_CuttedArea.dxf
(117.07 KiB) Downloaded 174 times

I hatched the removed material in layer 'Removed material (hatch)'.
Simply toggle visibility. :wink:

Layer 'Void_asPolylineWidth':
Polylines with a width of 6,35 don't do a good job here because: :oops:
- They use a flat pen while a cutter is round.
- They render faulty at arc-line segment connections and where the width is 2 times the radius of arc-segments.

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CVH

CVH
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Re: Circle hole glitch

Post by CVH » Sat Mar 18, 2023 10:36 am

Now that we are all on the same level and suspect that TAB's have something to do with it.

The major question that still remains is WHY :?: :!:
Why are CamEntities with handle 0x673 and 0x65c created and exported.

But then we could question sequences like this too:

Code: Select all

N1060 G40
N1070 G1
N1080 G40
N1090 G1
N1100 G40
N1110 G1 X15.2459 Y11.864
N1120 G40
N1130 G1 X18.7571 Y9.95
N1140 Z2
Why turning off cutter compensation 4 times in a row.
And 2 empties G1 lines ...

But there are more of such odd sequences ....
I'll stick to my EasyCam included in my driver software ... It isn't perfect too, but still ... :roll:

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CVH

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Husky
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Re: Circle hole glitch

Post by Husky » Sat Mar 18, 2023 10:42 am

CVH wrote:
Sat Mar 18, 2023 10:36 am
Now that we are all on the same level and suspect that TAB's have something to do with it.
Nope, we are not.
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Dreamaker
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Re: Circle hole glitch

Post by Dreamaker » Sat Mar 18, 2023 1:09 pm

Something I see in your simulation that is not in my simulation, and I don't understand why. In my simulation I see the glitch, but no tabs, but in your simulation I see no glitch, but see a tab, correct me if an wrong. I don't understand why that could be, I am using the exact same file. Shooting from the hip, I would have to say it has something to do with a tab in the hole, that I don't understand why it is there. Calling up my drawing and this is what I see on my system. I see no tab in the circle.
Attachments
Mount1.jpg
Mount1.jpg (276.57 KiB) Viewed 3393 times

CVH
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Re: Circle hole glitch

Post by CVH » Sat Mar 18, 2023 9:21 pm

Dreamaker wrote:
Sat Mar 18, 2023 1:09 pm
Calling up my drawing and this is what I see on my system. I see no tab in the circle.
IMHO it is the left higher TAB near the outer profile that has an influence on the glitch.
Remark that both higher TAB's create a bridge in the inner contour.
The lower ones only affects the outer profile because the distance to the inner contour is large enough.

TAB's are not associated with a contour entity ... They are global.

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CVH

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Husky
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Re: Circle hole glitch

Post by Husky » Sun Mar 19, 2023 12:04 am

Dreamaker wrote:
Sat Mar 18, 2023 1:09 pm
Something I see in your simulation that is not in my simulation, and I don't understand why. In my simulation I see the glitch, but no tabs, but in your simulation I see no glitch, but see a tab, correct me if an wrong. I don't understand why that could be, I am using the exact same file.
Will it help if I tell you that tabs will bring me one day into my grave ... :twisted:

Which simulation program you are using?

I modified a bit your file but Tabs are still in. Please run this file in your simulation or even on the cnc in wood. Will this file still issue the glitch problem? If it works I will explain what I did - if not I have to book it as an unnecessary exercise, ok?

AirManifoldMount2b_mod.nc
(7.37 KiB) Downloaded 177 times
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CVH
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Re: Circle hole glitch

Post by CVH » Sun Mar 19, 2023 8:03 am

Husky wrote:
Sun Mar 19, 2023 12:04 am
Will this file still issue the glitch problem?
Reading the G-Code textual:
- No TAB up motions in the inner contour.
- No overcut to position (15.2459, 11.864) + odd sequence with 4x G40.
- Identical lead in/out for both toolpaths.
- Outer contour with 4 TAB up motions.
  • Identical in size.
    Fairly identical placed at the curved edge (Within 0.1 unit or less).
    Somewhat more spaced at the straight side.
So I am pretty sure the glitch is gone in this nc file. 8)
What else of magic did you do than displacing the lower TAB's and probably creating the inner toolpath without TAB's visible?

I don't suspect that you needed to ground your PC better for that. :lol:
And sure, you still don't suspect that TAB's have something to do with it.
Husky wrote:
Sun Mar 19, 2023 12:04 am
Will it help if I tell you that tabs will bring me one day into my grave ... :twisted:
I assure you that holding TABs are mandatory for this kind of projects or (deadly) accidents will happen.
The main reason why machine centers are in an enclosure these days.
A small fragment of a scattered 6.35 endmill turning at 18.000 rpm is like a bullet.
Husky wrote:
Sun Mar 19, 2023 12:04 am
Which simulation program you are using?
Me? None at this point, for obvious reasons.
Example: Your modded nc file on CAMotics with its half moon shape but remark that there is nothing else left over, it is just a big hole.
Why? Read: https://camotics.org/gcode.html#missing-linuxcnc-codes
AirManifoldMount2b.png
AirManifoldMount2b.png (99.89 KiB) Viewed 3323 times

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CVH

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Husky
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Re: Circle hole glitch

Post by Husky » Sun Mar 19, 2023 8:32 am

@CVH
I participated in this topic to help the user. I didn't participated in this topic to have a smarty pants discussion with you. I'm not bored enough for that.
For those reason I'm out of this public discussion!


@Dreamaker
My PM will always be available to you. :wink:
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CVH
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Re: Circle hole glitch

Post by CVH » Sun Mar 19, 2023 9:13 am

I also participated in this topic to help the user.
A possible solution with hidden TAB's is in my first post.
But then it was a static discharge issue of witch I am not fully convinced.

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CVH

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Dreamaker
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Re: Circle hole glitch

Post by Dreamaker » Mon Mar 20, 2023 6:51 pm

Husky: I am a bit confused! I am sorry if somehow offended you, I may ask questions in an unconventional way, but I had no intention to be a smarty pants. You guys are way more advanced then I, and use the wrong choice of word combination. I am juggling a few different things because spring is coming. I am also getting together a 10 watt CNC Laser, so I got allot of things going through my head and may have offended you. Please let me know what I said so I can correct myself for the future.

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Husky
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Re: Circle hole glitch

Post by Husky » Mon Mar 20, 2023 11:13 pm

Dear Dreamaker,
Dreamaker wrote:
Mon Mar 20, 2023 6:51 pm
Husky: I am a bit confused! I am sorry if somehow offended you, I may ask questions in an unconventional way, but I had no intention to be a smarty pants.
You didn't offend me in any way and there is no reason for you to be sorry about! I've to be sorry that I confused you. :(
My comment was solely addressed to CVH! That is why the subject was "@CVH" what is used in internet slang as a acronym for "at CVH".

By the way: If you have an unconventional way to ask question then I haven't noticed that at all and that we are way more advanced then you is something what I honestly doubt! Maybe we have slightly different areas of expertise but at the end of the day we are here to learn from each other.

Hope my explanation clears the air and we are good again! :wink:
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Dreamaker
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Re: Circle hole glitch

Post by Dreamaker » Tue Mar 21, 2023 9:25 pm

Husky we are good!!!

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Dreamaker
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Re: Circle hole glitch

Post by Dreamaker » Tue Mar 21, 2023 9:43 pm

I think I may have figured out the problem. I don't know if someone else mentioned it and it didn't sink in my head or not. What got my attention was Husky's animation, and I noticed a notch which indicates a tab, where there should not be a tab. Now then, I run the same file on my computer, it does not show the notch. When I make a drawing the original always has a 1 at the end. And the file was a third revision of it. I went back original file, and ran the 3D on the file and it was hard to see, but I noticed that there were two notches in the edge of the internal circle. And the notches from the edge of the circle line up with the notches/tabs of the radius of the part. So what I am thinking is the length of the tab protrudes in to the edge of the Innercircle and cause the glitch, because the software thinks a tab should be there. Now this it a small part and the edge of the radius to the edge of the inter hole is only 3mm.

CVH
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Re: Circle hole glitch

Post by CVH » Wed Mar 22, 2023 7:41 am

Dreamaker wrote:
Tue Mar 21, 2023 9:43 pm
I don't know if someone else mentioned it and it didn't sink in my head or not.
First reply:
CVH wrote:
Thu Mar 16, 2023 9:39 am
Possibly the TAB has something to do with it ... I know that a TAB has a certain area of influence area ...
True, the inner path should not go up near the TAB's on the outer toolpath but it does.
More on how TAB's have an influence on the inner path:
https://www.qcad.org/rsforum/viewtopic. ... 913#p40318

Possible fix here:
https://www.qcad.org/rsforum/viewtopic. ... 913#p40313

And most probably simulators don't show the glitch because many simulate the programmed path with G40/G41/G42.
They don't simulate the actual tool center path what is 3.175 off and the glitch is hidden under the entry/exit move.

Still, CamEntities with handle 0x673 and 0x65c are faulty but there is a way to avoid them.

Regards,
CVH

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