When cutting circuar pieces, the wood grain orientation to the bit will change. Looking at the attached pictuire, if the grain goes toward the outside, the wood will be less like ly to split. It the grain goes toward the center, the wood will much more likely to split. Some wood species are more prone to splitting that others. To remedy this, it;s sometimes necessary to do a climb cut.
“The single biggest problem in communication is the illusion that it has taken place.”
George Bernard Shaw
Redondo Beach, CA