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Mach4 General Discussion / Jumpy arcs and curves in Mach4
« on: March 16, 2019, 08:53:37 PM »
New to the forum and this is my first post...
We just bought a new BOSS 5x10 CNC router with Mach4, HiConn Integra motion controller, and LeadShine drives/servo motors.
Factory support is a bit...limited.
It cuts straight lines no problem, but arcs, circles, and continuous arcs are very jerky and rough.
You can visibly watch and feel the gantry "lurch" in the Y axis, but the X axis appears very smooth.
We can rule out mechanical issues I think...the machine is new and has no binding or worn parts.
We can rule out the bit...we get the same issues with no material on the table and no bit in the spindle.
We can rule out feed speeds...we get the same results at 10ipm and 100ipm.
We are cutting poly/HDPE with a 3 flute upcut spiral by the way.
It's almost as if Mach4 is ignoring CV...it is most definitely turned on in the software. But whether we change to the slider from 5 degrees to 189 degrees, we seem to see no change in cut quality.
The problem is also perfectly repeatable...we get the same lumps and bumps at the same points every time which would seem to rule out noise in the machine. (We have a hefty earth ground on the machine right through the slab and 10' down)
Any ideas as to where else to look?
I'm attaching a copy of the G code file and some pics of both internal and external radii in 1/2" poly. WE tried making 4 passes to see if that would improve cut quality, but no luck.
Thanks for your help!
We just bought a new BOSS 5x10 CNC router with Mach4, HiConn Integra motion controller, and LeadShine drives/servo motors.
Factory support is a bit...limited.
It cuts straight lines no problem, but arcs, circles, and continuous arcs are very jerky and rough.
You can visibly watch and feel the gantry "lurch" in the Y axis, but the X axis appears very smooth.
We can rule out mechanical issues I think...the machine is new and has no binding or worn parts.
We can rule out the bit...we get the same issues with no material on the table and no bit in the spindle.
We can rule out feed speeds...we get the same results at 10ipm and 100ipm.
We are cutting poly/HDPE with a 3 flute upcut spiral by the way.
It's almost as if Mach4 is ignoring CV...it is most definitely turned on in the software. But whether we change to the slider from 5 degrees to 189 degrees, we seem to see no change in cut quality.
The problem is also perfectly repeatable...we get the same lumps and bumps at the same points every time which would seem to rule out noise in the machine. (We have a hefty earth ground on the machine right through the slab and 10' down)
Any ideas as to where else to look?
I'm attaching a copy of the G code file and some pics of both internal and external radii in 1/2" poly. WE tried making 4 passes to see if that would improve cut quality, but no luck.
Thanks for your help!