Can't tell from here but you may want to use a backup board. Are you talking about finger joints or box joints? Finger joints are usually made with a dedicated shaper head. Box joints can be made with a table saw and jig.
I don't know what the finished dimensions are of the parts you are using but if you are getting chipping the easiest solution would be to leave the material thick. Then run the finger joints and run it through a planer and surface it to the finished thickness.
I struggled with the terms "box joint" and "finger joint." Until this thread, I thought that they were one and the same.
The joint with square tabs that makes the corner of boxes is a box joint, but many people also call it a finger joint. To them, they are the same exact joint. I have used the terms interchangeably myself.
There is another kind of finger joint. This one uses interleaving fingers to join two boards into one longer board. The joint is flat. The pattern can vary, but most often it is in the form of tapered fingers that interleave together.
My take on it is that all box joints are finger joints, but not all finger joints are box joints.
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