It is not recommended to cut slate without a wet saw, as it can be difficult to make precise cuts and the slates can break or chip. A wet saw uses water to cool the blade and lubricate the slate, which reduces the risk of damaging the stone. However, if you must cut slate without a wet saw, a diamond blade grinder or a hacksaw with a diamond blade can work. Make sure to use appropriate safety equipment, such as goggles and a dust mask, and proceed with caution.