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Rasps can be used effectively on birch plywood without laminate chipping by starting rasping at an angle that is almost parallel to the main frontal surface edges of the board cut frame (see image attached), and progressively closing that relative angle as you proceed to rasping the edge perpendicular to the frontal surface.

This is how chipping off surface laminates of plywood can be prevented, or at least minimized as far as possible when using a rasp or a file.

Pointed tips, such as the fork tips, are best processed with a file or 100 grit sandpaper to avoid laminate chipping.

This is how I've processed my board cut slingshots manually after cutting the template shape with a jigsaw and using a spade drill for the pinkie & finger holes in the grip section.
 

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