tree problems!

[kingcreaky]

spent an hour or so yesterday morning making a prototype of these trees out of some 6mm ply.



Ive used vcarve for a while now without experiencing this problem, but for some reason (probably got something to do with importing a dwg) the toolpaths generated seemed to "stutter" the machine. Unline normal paths, the maching jittered all the way around the profile. Had to turn the acceleration and velocity down as it almost shook the thing to peaces.

as im asking for help here, I thought id give you best possible chance of seeing the problem. So Ive included everything

firstly, youtube video


dxg i based vcarve file on
http://buzz.pensys.co.uk/pensys/Tree2-120.dwg

vcarve file
http://buzz.pensys.co.uk/pensys/vcarve.crv

toolpaths
http://buzz.pensys.co.uk/pensys/toolpaths.zip


I check mach was set on 'constant velocity' and you can see from the straight at the end of the video, when in structed the machine normally runs much faster

any help anybody can afford me will be greatly appreciated. thanks in advance.