Hello,

Today I ran into a comparison of hobby CNC software on a russian forum. The
guy made a test trajectory and run it on a few CNC's. Here's the results:
KMotionCNC - 2:59
NCStudio v5.5.60 - 3:12
EdingCNC - 3:47
Mach3 - 5:25
PlanetCNC - 11:24
LinuxCNC was not tested.

So I installed a fresh 2.7.0~pre4 from git, edited axis_mm config to
100mm/s and 25mm/s2 for XY and 250mm/s2 for Z (by the test conditions). I
also set G64 P0.1.
The results were pretty unpredictable:
5:05 for arc segments and 4.50 for line segments with ARC_BLEND_ENABLE = 0
5:23 for arc segments and 6.50 for line segments with ARC_BLEND_ENABLE = 1
Looks like ARC_BLEND_ENABLE switch is inverted.
The way how it follows the trajectory confirms that too.

Also, 2.7 often shows an arbitrary non-zero velocity on preview when the
actual velocity is 0.

--
Andrew

PS: I attached the test files, in case someone wants to try.

Attachment: arc.ngc
Description: Binary data

Attachment: line.ngc
Description: Binary data

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