Knife and segments end

Having problems with or questions about SheetCam? Post them here.
Post Reply
shineworld
Posts: 15
Joined: Tue Nov 13, 2018 8:30 am

Knife and segments end

Post by shineworld »

Hi all,

we are CNC controls makers and we are using sheetcam to produce a knife path for a ultrasonic cnc cutter.

Strangely when we import a NC (Gcode path) or a DXF path a lot of "segment end" are placed in continous curve
and this create a lot of UP/ROTATE/DOWN knife movements which invalidate any working.

There is a way to say "this line is continous don't place a UP/ROTATE/DOWN" every little segment ?
User avatar
Les Newell
Site Admin
Posts: 3661
Joined: Thu May 11, 2006 8:12 pm

Re: Knife and segments end

Post by Les Newell »

g-code can only cut lines and arcs. If your dxf contains curves that do not fit an arc they have to be broken into lines.

What post processor are you using?
shineworld
Posts: 15
Joined: Tue Nov 13, 2018 8:30 am

Re: Knife and segments end

Post by shineworld »

I'm using this post: RosettaCNC tangential cut

In sheetcam:
001.png
001.png (8.37 KiB) Viewed 1865 times
In rosettacnc:
002.png
002.png (26.35 KiB) Viewed 1865 times
Job file:
User avatar
Les Newell
Site Admin
Posts: 3661
Joined: Thu May 11, 2006 8:12 pm

Re: Knife and segments end

Post by Les Newell »

The main problem is that you are using the drag knife plugin with a tangential knife. The drag knife plugin should only be used with kives that are free to rotate on a bearing. Those odd moves are the realignment moves that are needed for drag knife.

Define your knife as a milling tool and use a 'no offset' contour operation.
shineworld
Posts: 15
Joined: Tue Nov 13, 2018 8:30 am

Re: Knife and segments end

Post by shineworld »

The issue seem to be solved using a new post-processor for Mach3 tangential V2 found in this forum :)
Post Reply