if its a slot in sink, i just cut from the laminate side as the lip of the sink will cover any chips,
also don't forget to seal the exposed wood after cutting with silicone
all the joiners on the last contract i was on cut them from the bottom using circular saws as near the corner as they could go then turned them over and finished the cut with a jigsaw, they said it was by far the quickest and most accurate way as circular saws cut straighter
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