Mach3 won't cut this file smoothly

[Salty72]

I'm running Mach3 and using the mach3B post for MasterCAm9, to cut this file out

my problem is that I can't get the router to move in a constant volocity. it just wants to move point to point and is extreamly jerky..almost like it is stuck in exact stop mode.

N100 G00 G17 G21 G40 G49 G80 G90
N110 T1 M06 ( )
N120 (MAX - Z50.)
N130 (MIN - Z0.)
N140 G00 Z50.
N150 G00 X108.715 Y66.796 S320 M03
N160 Z10.
N170 G01 Z0. F900.
N180 X108.694 Y20.787 F1800.
N190 X108.895 Y19.864


Pls Note: that although there is no "G64" in this portion of the attached header detail, inserting it on line N160 so it now reads...
N160 G64 Z10 seams to make no diffence...

I also tried inserting it at line N180 so it read
N180 G64 X108.694 Y20.787 F1800 (even selected constan volocity in Config /General ConFig) and inserted the following string
G17 G21 G40 G80 G90 G94 G54 G49 G64
any one waNt to have a go and get back to me Pls...

[Salty72]

WELL I might have fixed it.....

on the "Settings" tab (Alt+6)
towards the bottom right hand corner, there are two little buttons; one displays, "CV Distance" Whilst the other displays "CV FeedRate"... with both of these UNCHECKED, the router free air cuts so smoothly it's a dream to watch again....

Question I have is... So what do these puppies do,? and why did I get the result I got ( settings for "CV Distance"=0.001, Whilst "CV FeedRate"= +1.00) when they were CHECKED

[CNCAddict]

Question I have is... So what do these puppies do,? and why did I get the result I got ( settings for "CV Distance"=0.001, Whilst "CV FeedRate"= +1.00) when they were CHECKED

Yeah, Art had a bug which turned on "CV Feedrate" automatically. I believe this value turns off CV until the feed command goes below this variables value.

Ditto for CV Distance...unless the distance command G00/G01 etc. is below the specified value...it'll turn of CV.

Art says not to use either of these unless you absolutely have to.....