Grooving Boring Bar’s Coolant Holes Optimize Blind Bore Machining

Walter USA’s Walter Cut G1221-P grooving boring bar with precision cooling is designed for recessing and internal grooving. The monoblock boring bar has two coolant holes. One enables the coolant to exit the insert top clamp directly to the cutting edge in the radial groove to provide precision cooling. The other is at the front of the bar and can be left open to evacuate chips out of a blind bore, or sealed off in a through-bore to provide increased coolant to the cutting edge.

An O ring is recessed into the bar clamping diameter to prevent pressure loss and to provide leak-free coolant supply to the cutting interface for machines with low coolant pressure. Combined with the company’s UF8 chip geometry, it is said to improve process reliability, productivity, surface quality and tool life.

The boring bar can be used in both the normal and overhead position. The system holds GX09 and GX16 inserts with widths ranging from 0.062" to 0.125" (0.8 to 3.5 mm). It is suitable for internal grooves from D_min = 0.63" (16 mm) and for grooving depths ranging to 0.39" (10 mm) in all ISO material groups.