Rounding corners

I'm using a laser cutter and having an issue where it is rounding some of the corners, but not others. Has this happened to anyone else?

Thank you TommyLight. This did the trick. After researching your post, I ended up using G61, which made it go to the exact point programmed.

Just remember with G61 set the machine will be coming to a stop in all corners (no mater how small). You might be very surprised how much faster the machine might mill with G64P0.01 (or some other small number) and still give you acceptably precise corners. This can be especially true with cam generated g-code.

I think G61 should be the default in linuxcnc. It seems to come up so many times by users not familiar with the motion planner.
I almost crapped my pants with the default settings on my gang lathe. The rapids between tool changes had large radii that didn't jive with the clearance z retract. Blending right into a collision with the stock during the move to the next tool.
Same with milling, if you are used to a small z retract above the part say in spot drilling, if your settings are coarse, the z will clip the hole on the way up as the table is already moving.

Maybe, but it is also the norm for many commercial Fanuc controled machines.

People used to working with cnc machines know and understand the importance of having proper preamble codes at the beginning of your g-code files. it isn't safe to assume machine defaults are correct for your program.

To me the weird thing was that some of the corners were rounded, but others weren't. In fact, some of the corners that were not rounded were more acute angles than the ones that were. I'm not sure why the algorithm would do it that way. For the cut that I'm currently working on, a full stop doesn't slow things down too much. The cut is taking around 12 min and comes to a full stop 36 times... I'm guessing adding less than 10 seconds.

I will run a test with G64 P0.1 Q0. vs G61 and time it. That would be interesting.

I ran a test using G61 and it took 14:03. Then I switched to G64 P0.004 Q0.004 and it took 14:11. (0.004 inches is close to 0.1 mm).