Rotary speed issue when cutting

[Silvers (Eamonn)]

K40, Smoothie on C3D mini running LB 09.02

Not used my rotary for cutting for a while now but I’m having an issue when cutting squares out.

The speed is OK when X is going +ve but when its -ve it slower causing increase in burning.

Checked the G-code and every time the X speed is always slower for some reason.

Tested on circles and other shapes and its all good.

This only happens on squares.

Any ideas guys.?

File attached of basic square G-Code in picture format, forum won let me upload Gcode file…

[Silvers (Eamonn)]

Up-date.

Did many many more runs and when “fill” is selected it works perfectly.

Select it to cut and it cuts 3 sides at the correct speed but when doing the return cut on the square it slows down.

I have tested this on flat using X/Y and it works perfectly every time.

picture of the G.code with cut using x/y

.So I still cant it to do what it used to do…

If I can find an earlier version will drop back to that see if it does has the same issue.

Any help or suggestions would be appreciated.

[Silvers (Eamonn)]

Ok. Managed to finally get some more time on this.

Whenever I use Rotary on fill it works right.when I try to use it on cut it still changes speeds on each cut @LightBurn any ideas ?

I have tried laserweb and it works accurately each time.

So I k ow it’s not the rotary device I have.

Tried to drop back to an earlier version but it won’t let me install.

[LightBurn (Oz)]

I believe I have this fixed. Will need to do a little more testing, but there was a reasonably obvious bug in the calculation for feed rate when using current position or user origin modes.