cnc not smooth in xy circle motion

rroie

rroie
spindle starts out smooth then gets jerky, hesitates as it is going around.
 

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cncnutz

CNCnutz
Staff member
Hi @rroie

Your Gcode is made up of short lines which is why the motion is not smooth.

Convert the drawing to circular arcs and the Gcode will run smooth. You are using Vectric software so this will be very simple for you to do.

Hope this helps

Cheers

Peter
 

rroie

rroie
Thank you that did it. Never had that problem before. Program was made in aspire nothing imported. Did not know how to do it and watched a YouTube said" bezier curves was better". Wrong did not work. Circular arcs was the answer. Again thank You.

Roie
 

cncnutz

CNCnutz
Staff member
Bezier curves are not circular arcs and Gcode can only describe a circular arc. Anything else is output as a series of straight lines.

In the past if you ran Gcode like this and got smooth motion then you would have been running in constant velocity mode. This would have had the controller trying to work out where you were going and then making up a toolpath that would allow it to get there without slowing down. The result is an approximation of what you wanted to cut. Masso runs exact stop so you get exactly what you ask for.

Cheers

Peter
 
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