Problems with Lucy

[Neale]

Maybe used Aspire to generate separate gcode files for each circle? There's quite a small stepover as well, from what I can see, which is probably not needed for cutting this material. Not how I would have done it, but not the issue here, I think. It does take a while to get the hang of all the different settings once you start using any CAM package. I still favour mechanical overload causing something to slip, having had exactly this problem setting up my own new machine a week or two back

[CrazeUK]

Hey guys.

Thanks for the responses:
Apologies, looks like i uploaded an incorrect file, i have now edited the original post with the correct file: CNC Test-20170304.txt

The machine ran from the centre circle 6, outwards until circle 2.
I noticed everytime the machine was doing a circle it moved to the centre and worked its way out - I know i set the design up wrong.
At circle 1, The machine lifted off the Z axis zero about 2 inches, then went to start the Outer circle (which was a full through cut (with 1mm extra). At that point it went off on a tangent, which looked random, i would describe it as jumping.

Judging by what you guys have said about feed rate, do you think it was:
1. It went from foam board into MDF so was a bit tougher
2. The feed rate was way to high for the depth it was cutting at, so it jumped.

I know the machine definitely lost position, because it didnt go to the correct home position after.

[CrazeUK]

Machine Setup:

Not sure what other info you need:

The bit: End mill 3x6x15x57 (Shank x Bit Radius x Shank length x Bit length)

Machine:
Dimensions: 1000 x 1000mm
Cutting D: X: 720 x Y: 800 x Z: 400 (i think)
Axis: 4 (3+1)
Drive: X & Y - Belt, Z - Ball screw
Driver board: CNC4x45A Via Parallel
Limits: X, Y, Z Home, X, Y, Z Limit + EStop
Software: Mach3, LazyCam, Aspire, Autodesk, Google Sketchup Pro

[johngoodrich]

had a look at the new file, it seems fine to me, apart from the feed which is set at 12000mm/minute, very fast but depends on how good your machine is. Personally I would say that is the cause of your problems but that is just my thought

[CrazeUK]

had a look at the new file, it seems fine to me, apart from the feed which is set at 12000mm/minute, very fast but depends on how good your machine is. Personally I would say that is the cause of your problems but that is just my thought

My machine definitely isn't great. I have a huge list of upgrades that are needed. Primarily around driving the various axis.

Sent from my SM-N930F using Tapatalk

[CrazeUK]

@Johngoodrich i think you where right. I was pushing the machine way too fast.
I have slowed it right down to between 5 and 15 mm/sec dependent on the material.

I am also doing numerous passes depending on the thickness, so no errors as yet.

:D