Good Day Everyone,
Background....
I built a Mechmate about 6 months ago. For those you are not familiar with it. They are a gantry type machine that run on linear v rails. All axes are gear driven. Mine was designed with all induction hardened rails and wheels. All racks are 20dp with 30 tooth pinion. It is a stepper machine, not servo. The steppers are Oriental Motor PK296A2A-SG7.2. My HMI is Mach3 with 2 parallel ports (one from motherboard and a rosewell pci card). They are connected to a PDMX-126 + PDMX-134. All inputs are 24VDC based with the exception of the touch off sensor to set my tool height (my Z zero and table are 0). I am using Gecko 203V drives powered by Antek PS-5N38 (steppers wired bipolar). Water cooled 2.2kW spindle powered by Hitachi WJ200 VFD controlled by modbus. I use Vectric Aspire.
Question?
First and foremost. Sometimes I have a hard time putting to paper what is in my brain, if you need more information please ask as I will try to post the best question and/or answer possible but I do not always do that.
I am thick headed at times but I am having a hard time understanding how motor tuning velocity and acceleration corresponds with good cut quality with complex 3d cuts. I know this should be simple to understand but somehow my brain is locked. I need it in layman's terms. I have posted elsewhere but everyone says this is where you get the best advice. I did my first finish toolpath with the Area Machine Strategy as Raster. I am getting ghost lines and not a clean dish carving with the cut. Here is a link to the carving. I have used Offset in Aspire before for finish machining but have noticed that it creates a notch on the upswing of the dish cutoff. I have seen most threads and videos use raster. So I have played and played and played with the velocity and acceleration but still have the problem areas. They look undercut on the approach of the 3d model. I have been able to minimize it by moving my acceleration down to 10 on my Z axis but it is still there. It is there at 20 ipm and there at 80 ipm. Programmed feedrate does not change it. The only thing that changes the size of it is the acceleration. So here I am, I could play with these numbers until I get it and waste hours and hours of carving time but I feel if I understood what exactly is happening it would help me correct this problem the correct way. Sorry for the novel.