Hey guys pretty new to the CNC scene.
Anyway I was making a sign for my wife using advanced V-carve on my shapeoko. The 60° Vcarve bit created gashes in the side of the letters (see pictures).
I have cut a few items with the advanced Vcarve and had never had this issue. I used the standard carbide create feeds and speeds. Does anyone have insight on what it could be?
Just a thought but couldn’t it just be poor quality of the ply? .f you have some leftover piece to spare, remove the top layer and check whether the inner layers have voids?
I also thought it might be the quality of the wood causing the issue. It is a pine board from my local department store although I did cut a flag from the exact same board with no issues. So I just wanted to see if anyone had seen a similar issue. Unfortunately that was the last of that wood I had so I will have to pick some of more of the same kind before I can test it again.
In the pictures the areas that you are cutting cross grain is tearing out and likely going against the grain. Wood grain structure is like petting a cat. If you pet from head to tail the hair is pretty smooth. If you pet the cat from tail to head the hair sticks up all over the place. When you cut with the grain the tear out is minimized because the cut grain is supported by the grain below it. When you cut against the grain the grain tends to tear out because it is not supported and just like the cat’s hair you get a messy out come. You cannot control the grain direction but you have to compensate for it with feed and speed and depth of cut (I repeat myself). So you need to make sure your vee cutter is sharp. If it is sharp then slow you feed and you depth of cut. Also you could run the job again and get a second go around. The running the job again takes time but may solve your tearfout problems. Look at the pictures the wood looks like poplar or pine. Poplar is considered a hardwood but is the softest of the hardwoods. Pine is soft and easily tears out. So if these are your wood choice you have to compensate with F&S and depth of cut and use very sharp tools.
Thanks for the response! The explanation and pictures were very helpful.
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