to me that looks like something is moving, your going to have to inspect everything for movement as small as .005" I also don't like what I saw on the edge of the cut. Checkout the z axis and Y axis plus make sure the motor rotor does not move.
It may not be the case on your project, but more and more I make sure I have my workpiece clamped down in all directions. the fence on the table with it's ridged edges is not going to hold down that edge of the board if it decides to start warping or cupping. So I am clamping down along the fence side and in the middle also. As I posted in another thread here, I have had boards that were perfectly straight warp after getting them done, and also happened during the carve which resulted in lines in the project. In your instance if the board cupped up at both of the long edges that would bring the board closer to the bit by o-so-little but enough to cause the lines.
Thanks Bob & Greg, I'll check to make sure everything is tight. I think the board was secured, but will pay closer attention next time. I had a 12" wide Oak piece with a slight cup that got dramatically worse during the carving, so I know what you mean.
Here is a picture of the result. (Bottom) The top carve was using 10% Gausian blur applied to all as provided in earlier instructions in this thread. It cut a "box" around the letters & I think that might be because I applied the blur to "All". My guess is that if I was able to apply it only to the text, that it wouldn't create the cut out box around it??? (Not that I know if that can be done or not, just guessing)
Anyway the bottom picture is the result of the 2 previous posts. This is problematic since I only will have 1 1/2" wide piece to work with and it carved on an angle.
Only way I can think of to avoid having the "box" around your text area would be to not have the bit touching the surface when you are setting your origin points (z) .....say you left the z 1mm off the surface you might need to add that to your carve depth setting to come up with the depth you originally wanted the text to be. When I set my stuff up, I always set the z with the bit touching the surface and as a result when it carves it goes maybe .5 mm into the area that would be flat but since most of my stuff is getting cut out or trimmed up it's not an issue for me. As for that slanted job I've got no answer for that, other than gee code being messed up somehow. Mine took off on it's own mindless direction like that once but has not done it since.
imagine the roof on your house and the floor inside and now say that is your cut boundry for your Z axis, now say your roof is 8' and you tell your carpenter to start at the bottom and go up 8' only your top is 8'1" so your going to have some left over at the top.
The feed depth per cycle should not be more than .001 difference from the depth of the cut if it is you get a box at the top for the left over amount.
Bob, that is what I have been doing. Keeping it just off the surface & that has worked. I did it with the top carving also, but also selected "All" & applied a 10% Gausian Blur effect, which I had never done before. So I am assuming it has something to do with that or that when using a Gausian Blur effect I have to hold it even higher off the surface???
Irestore, I have been setting my feed depth per cycle to be exactly the same as the depth I have chosen on the project, been doing that every since I gave up on multiple pass cutting ( too much room for error ) . I really do not think the gaussian blur is what has affected the project. You can remove the the background from a duplicate of the image, save it to a file then blur your letters and re- add the background.
One other thing he can check is the color code it needs to be ALL white I think the code is &fffff if it's off by only one letter it wont be the top of the cut.
Ok I want both of you guys to forget about Gimp for a minute and go download a program called "Inksape" then go to youtube and watch making text and logo's in Inkscape for beginners your going to be amazed and it will open a whole new world for what you can do with this machine.
Don't get scared off because this program is complicated I have had it a year without using it until a few weeks ago, those videos will get you going on text in one day.
Irestore, did you make your cut on the slow setting?