This reduces the risk of workpiece etc accidentally making a ding in the corner. This can be done with a slot drill ground to cut 45 º chamfers. The top two corners of a T-slot have two small chamfers on them. This is so if a bolt is screwed against the bottom of the T-slot and forms a burre, this will not catch on a T-slot nut. The depth of this cut should slightly deeper than the cross of the T. This is because, apart from the use for holding workpieces etc, the t-slot is often used for aligning the workpiece or the workholding device. It is important that the slots are straight, are of an accurate and consistent width with a reasonable finish. Alternatively it can be cut using a side and face cutter on a horizontal machine. This can be done using a slot drill or an end mill on a vertical machine. The first step on any T-slot is cut out the shank of the T. 729 the end of the T-slots on a milling table Making a straight T-slot