One time, when I was making a lensboard for a Speed Graphic.
I was cutting some maple (3/8" thick), making it thinner on the edges to fit the camera.
My solution was to make it in steps or passes. Taking less material in each pass. By doing that, I didn't have the problem with wood anymore.
This last week, with aluminum, not a single problem.
I have to say that I make the chuck much tighter than I would to drill a hole.
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