[janis93]

hello, i have problem with uccnc,

my cnc tont run smood on wery simple contour.
https://gyazo.com/e82f5f4b0f9ca09243ae0e169ba07bb4

On red circle cnc stops very vast and then almost immediately starts moving again.

what can cause this thing.

in attachment is also 2 gcodes there are 9 details all of them ar tooing same litle stopp on same place.

used fusion 360 to generate gcode.

[ger21]

UCCNC can sometimes have issues with transitions to/from arcs.

Increasing acceleration or decreasing feedrate can help.
Using all G1 straight segments can also run smoother and faster sometimes.

CNC Drive is planning on writing a new Trajectory Planner, and will address this issue then.

[janis93]

UCCNC can sometimes have issues with transitions to/from arcs.

Increasing acceleration or decreasing feedrate can help.
Using all G1 straight segments can also run smoother and faster sometimes.

CNC Drive is planning on writing a new Trajectory Planner, and will address this issue then.

When this planner update arrives any idea?

I have acceleration on 900mm/s2
And cuting feedrate 3500mm/s
Rapids are 10000mm/s

This is very anoing behavior.

In picture is my diy cnc

[ger21]

When this planner update arrives any idea?

Probably at least 6-12 months. They haven't started working on yet, that I'm aware of.

Can you set your accel higher?


Have you tried increasing the error tolerance settings?

[OlfCNC]

Set you CAM software to generate lines (G1) instead of arcs (G2/G3) and then all the path will be lines and should be no more problem.

[peteeng]

I agree with Olfcnc - export your dxf from fusion as polylines of a suitable length and this issue will clear up. UCCNC does have a glitch with arc ends occasionally that I have not been able to resolve. Only strategy has been the polylines. Peter

[janis93]

how I can set it up in fusion 360 ?

I want to try this one.

Maybe I can get higher acceleration something 1500 maybe but this is max i think.

[ger21]

You may need to edit the post.

I found this info?

https://forums.autodesk.com/t5/hsm-p...s/td-p/6095167

[janis93]

okay thanks, i think I can try this one on weekend.

anything else i have to change ?

If I replace arcs with lines is the contour smoothness is affected ?

[peteeng]

Yes if you pick a big line length. I typically use 1mm or 1.5mm for the polyline length. Peter

[janis93]

so situation where I need 10mm hole with 6mm endmill will result some 8 corner hole ? i dosent seems weary professional

[OlfCNC]

so situation where I need 10mm hole with 6mm endmill will result some 8 corner hole ? i dosent seems weary professional

Huh, what are you talking about?!

[ger21]

Circles should cut just fine with arcs.

If you used line segments, you'd use about 100 for a hole, not 8.

You shouldn't see any difference in your finished parts when using G1 moves vs G2/G3 moves.

[janis93]

okay, I try to mod post.

it has to wait some time i cant go to where is my cnc about 2 weeks.
but if to test cutting and comparison I will get back with results.