Circles not coming out round

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samjenp
Posts: 4
Joined: Mon Sep 04, 2017 7:04 am
Model of CNC Machine: home made 3 axis

Circles not coming out round

Post by samjenp »

Hi ,
I'm having problems with circles coming out oval shaped.
This is my first time trying to engrave of a PCB board.
The pads and circular parts came out odd shaped.
Straight Lines and squares are ok, except a couple of the diagonal ones came out too close together, they were perfectly space, but just started in the wrong place

I am using the 'gcode_arc_mm' post'processor '.

I also used a 30 deg 0.2 mm engraving bit.

On larger (non PCB) projects I used a 3 mm router bit and I notice circles are slightly out of shape but no where as bad as this.

Does anyone know what the problem cold be?
Is there some kind of calibration issue?
is there a GRBL setting I have wrong ?

I attached an image of the Cut2d tool path and a photo of what the PCB came out like (which is pretty crap)

any help would be appreciated
Thanks
Sam
looper PCB.jpg
pcb2.jpg
Last edited by samjenp on Mon Oct 30, 2017 12:56 pm, edited 1 time in total.

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IslaWW
Vectric Wizard
Posts: 1402
Joined: Wed Nov 21, 2007 11:42 pm
Model of CNC Machine: CNC Controller Upgrades
Location: Bergland, MI, USA

Re: Circles not coming out round

Post by IslaWW »

In all but the most rare cases, any difference in your results on the machine to that of the preview would be mechanical. Most likely machine tuning or its ability to perform at the programmed speeds.
Gary Campbell
GCnC Control
ATC & Servo Controller Controller Upgrades
GCnC411 (at) gmail.com

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