Milling a pocket is not a continuous move?

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10 Apr 2018 06:27 #108711 by Longbow
Hi all!

I will try to explain my problem briefly:

When milling a pocket the path is not continuous. The CNC machine stops at some points. I observed that when milling a circle shaped pocket it stops for 3 times during a circle instead of using a continuous motion through the entire circle.

It is the same with other milling options: inside normal / outside normal / on the line

I tried with 100% ramp-down but it still pauses.
I tried with the same feed speeds for vertical and horizontal motion but still pauses.
I tried playing with the G64 command but it still pauses.

For smaller endmills this pausing during milling could be fatal.

Otherwise I really like the nativeCAM package. It makes 90% of the shop tasks a breeze. Bravo!

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10 Apr 2018 15:12 #108750 by andypugh
Are you sure that you are not in exact-stop mode?

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10 Apr 2018 15:42 #108754 by FernV
Hi Andy,

Pockets gcode are being re-coded to use only spiral mode.

Can you explain exact-stop mode ? I never heard of it before

Regards
Fern

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10 Apr 2018 15:51 #108756 by andypugh
The following user(s) said Thank You: FernV

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10 Apr 2018 23:13 #108775 by tommylight
Most probably to low acceleration, so it slows down on every cut line or radius.

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11 Apr 2018 08:38 #108795 by Longbow
I tried with G64 P1.0 and still pauses during a move.
My acceleration is set to 300mm /s which I think is enough because when I do a separate CAM program using helix, it will not pause.

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11 Apr 2018 08:41 #108796 by Longbow
Also, I observed that the last cut goes smooth without pause the entire circle. That is the cut when it is on the final cutting depth.
So there must be a problem during ramp-down?

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11 Apr 2018 10:55 #108802 by andypugh

Longbow wrote: Also, I observed that the last cut goes smooth without pause the entire circle. That is the cut when it is on the final cutting depth.
So there must be a problem during ramp-down?


Perhaps your Z axis has lower accel than X and Y?

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11 Apr 2018 16:13 #108822 by fc60
Greetings,

Try G64 P0.001

P1.0 seems rather coarse.

Cheers,

Dave

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12 Apr 2018 08:30 - 12 Apr 2018 08:35 #108871 by Longbow
@andypugh:
All 3 axis have the same acceleration rate. Even if it wasn't so, It should only deaccelerate, not pause aka stop during the move?
Does your machine work without pausing?

@fc60:
I think that the default setting in nativeCAM is G64 P0.005
I also tried P0.001 but it's the same. So I went the other way to see if any change happens but it's like I did not change a thing.

I wonder if the problem lies in the way that nativeCAM builds up the program code (g-code) subrutines?
Last edit: 12 Apr 2018 08:35 by Longbow.

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