Simple question, I think, but I am not happy with the results I have been getting so far.
I am making a dust shoe and need to machine four 10mm diameter recesses 4mm deep for the magnets. Ideally I would like to machine the whole component with, say, a 6mm slot drill but find that the magnet recesses display a very jerky movement.
I have tried altering the machining specifications for the 6mm tool with less than satisfactory results.
What am I doing wrong ?
I could go to the expense of buying a 10mm slot drill a just drilling the holes but do wonder if there is a better way of doing it.
If you were using a pocket toolpath then the jerky movement as you described it is simply because the machine was moving a very short distance between its changes of direction, slowing your feedrate right down would improve this to some degree but probably never get rid of it entirely. The machines weight & rigidity will play a large factor which you can't really do anything about
Best option I have found & one that I use a lot when wanting to cut small or narrow pockets is to use Adrians suggestion of a profile cut inside the line, normally as Adrian also suggested using a spiral ramp
In case this hasn't been suggested, make sure your circles are true circles and not vectored circles. I've been burned by this a couple of times. A true circle has besier curves and smooth points. A vectored circle is made up of tons of vectors forming a "circle". Each vector requires the machine to perform a small incremental move versus smooth moves.
I always convert Bezier curves to arcs and lines ("Fit curves to Vectors"). There is no g-code for a Bezier, so it always results in toolpaths using the dreaded short line segments, instead of arcs and lines which do translate directly into G2 and G1 commands. I do keep the unconverted Bezier on another layer for editing purposes, I copy the vectors to another layer before converting and creating toolpaths.