[snowdaze]

I'm having an issue where I am trying to cutting large (15") ellipse and the arc portions are giving the machine trouble.

The machine is jerking around the corner and it is very noticeable on the final piece.

Is there a setting in mach3 to smooth this or do I have something set wrong in one of the configure pages?

specs on my machine:

4x8 plasma
NEMA23 620oz Stepper Motors
1000 ipm Rapid Travel
mach3
ESS
sheetcam
hypertherm 65

Material
14ga aluminum
300ipm
45 A
136V
THC


The drawing was made in inkscape and the ellipse has 4 nodes
Not sure on what I have set wrong here

any help on certain mach3 config setting to look at would be great

[komatias]

I'm having an issue where I am trying to cutting large (15") ellipse and the arc portions are giving the machine trouble.

The machine is jerking around the corner and it is very noticeable on the final piece.

Is there a setting in mach3 to smooth this or do I have something set wrong in one of the configure pages?

specs on my machine:

4x8 plasma
NEMA23 620oz Stepper Motors
1000 ipm Rapid Travel
mach3
ESS
sheetcam
hypertherm 65

Material
14ga aluminum
300ipm
45 A
136V
THC


The drawing was made in inkscape and the ellipse has 4 nodes
Not sure on what I have set wrong here

any help on certain mach3 config setting to look at would be great

can you post your gcode?

[CS900]

I'm going to guess it's not mach3, but more likely a setting in sheetcam. You probably need to adjust the faceting or resolution of the arc as it converts it into line segments.

[snowdaze]

Here is are the .tap and .job files, I don't know what portion of g code you want to see, but there is 600+ lines so I didn't think I should paste it in here either.
Attached as .zip

Thank you

[Mike 1948]

The Oval outside shape looks like a bunch of straight line segments in Sheetcam.
Check your drawing import options in Sheetcam. Maybe increase the arc fitting tolerance.

Mike

[snowdaze]

Thanks Mike I will take a look for that setting in sheet cam

[snowdaze]

Mike one question, how did you determine the oval looked like a bunch of small line segments?, did you zoom really closely into the part in sheetcam ? or is there another way?

[CS900]

you can zoom into the preview window in Mach3.

[Mike 1948]

Mike one question, how did you determine the oval looked like a bunch of small line segments?, did you zoom really closely into the part in sheetcam ? or is there another way?

You said the ellipse only had 4 nodes, when you looked at in Sheetcam it had many more the 4. I zoomed in in Sheetcam and they looked like straight lines.

Mike

[Torchhead]

The segmentation happens in the DXF export. Transfer to SheetCAM directly via SVG and the arcs will be intact like in Inkscape. Also make sure CV is turned on in MACH and that CV feedrate is OFF.

[snowdaze]

Thank you for replys I will try this.