Hi,
I fairly new to Mach3 (but well versed in shopbot)
I have played around with CV settings, but cannot get my cnc to transition smoothly between arced paths that meet straight lines and each other in line using G02 commands in a tool path file. I have cv on with distance set to 2(mm), and find I need this to stop arcs forming around any angular change in direction (with a bit 4mm dia and over). The machine slows up like it were going round a sharp corner - but it isnt, but not on every transition.
The following code does it around 4 times, though it is cutting a single large circle:

(Start of cutpath 11102921.01)
G21
G00 Z25

(Path 1)

G00 X309.93 Y332.19
G01 X309.93 Y332.19 Z0.00 F1000
G02 X309.93 Y212.01 I-184.93 J-60.09 F3000
G02 X239.29 Y114.79 I-184.93 J60.09 F3000
G02 X125.00 Y77.65 I-114.29 J157.31 F3000
G02 X10.71 Y114.79 I0.00 J194.45 F3000
G02 X-59.93 Y212.01 I114.29 J157.31 F3000
G02 X-59.93 Y332.19 I184.93 J60.09 F3000
G02 X10.71 Y429.41 I184.93 J-60.09 F3000
G02 X125.00 Y466.55 I114.29 J-157.31 F3000
G02 X239.29 Y429.41 I0.00 J-194.45 F3000
G02 X309.93 Y332.19 I-114.29 J-157.31 F3000
G00 Z25
G00 Z25
G00 X0 Y0
M30
(End of File)

Any help most appreciated.

Ralph.

I have only been doing this for a year so I'm new as well. But I ran into the exact thing last week. It turned out to be Sketckup in my case. When I made the drawing and import to CamBam, the arcs were not one section but instead were many. When I dry cycled it through the program, my servos looked like they were having a fit around the corners.  exploded the drawing and noticed the many sections. I redid the corners in CamBam from scratch and it was fine after that.

Hope this helps

It also has something to do with the size of the arc.  I've always seen this on small (like 1/2" diameter or less) arcs.  Where the arc meets a straight line segment, mach hesitates.  I see it all the time cutting small slots.  Make the slot larger and the problem goes away.  To complicate things even further, it doesn't do it all the time.  I can make one slot in Rhino and duplicate it 10 times in Sheetcam.  Some of the slots will hesitate and some won't.