Coolant-Flow

I spent the first three years of my career watching the coolant pressure gauge like a hawk. If it held steady at 1200 psi, I assumed everything was fine. Chips were packing? Must be a feed issue. Drill broke? Wrong parameters. Then a senior engineer walked over to my machine one afternoon, pulled out a bucket and a stopwatch, and showed me that my pump was delivering less than half the flow the drill actually needed. The pressure gauge never flickered. ...

The coolant pump is the heart of any deep hole drilling system, and I have seen more production downtime from pump failures than from spindle issues. The pump must deliver consistent pressure and flow at the tool tip, and the maintenance approach is completely different from the standard sump pump on a CNC lathe. Pump Selection Criteria The pressure and flow required depend on the drilling method, tool diameter, and depth. For gun drilling, the rule of thumb I use is 800 to 1,200 psi (55 to 83 bar) for diameters under 20 mm, and 400 to 800 psi (28 to 55 bar) for diameters above 20 mm. BTA drilling typically runs at lower pressure, 200 to 500 psi (14 to 35 bar), but requires two to three times the flow rate. ...

Every time I talk to a shop that wants to start gun drilling, the question comes up: how much coolant pressure do I really need? The manufacturer’s spec sheet usually says 1000-2000 psi. But real-world results vary depending on diameter, depth, and material. Here is what I have found works — and what does not. Pressure vs Flow: What Matters for Chip Evacuation Coolant does two jobs in gun drilling: it lubricates the cutting edge and it pushes chips back along the flute. Lubrication needs pressure. Chip evacuation needs flow. You need both. ...

Heat buildup in thin wall drilling is a problem that affects both the process and the part quality. The thin wall cannot conduct heat away from the cutting zone as fast as a solid section can. The heat accumulates locally, causing thermal expansion that changes the bore diameter during the cut and leaves residual stress in the part afterward. Problem Description When heat accumulates in a thin wall section, the material expands at the cutting zone. The bore diameter temporarily shrinks as the expanded material pushes inward. The drill then cuts a larger diameter than intended because it is cutting into the expanded material. When the part cools, the bore spring back undersize or out of round. ...

How Ejector Coolant Flow Works: Inner and Outer Tube Before you can troubleshoot an ejector system, you have to understand how the coolant actually moves through the tool. I spent my first year working on ejector drills thinking the coolant flow was similar to BTA – and I paid for that assumption with scrapped parts and broken tooling. Ejector drilling uses a dual-tube system. The outer tube carries the drill head, and the inner tube runs concentrically inside it. Coolant enters the system at the outer annulus – the space between the inner and outer tubes. About two-thirds of the coolant flows forward to the drill head, where it exits through the clearance gap between the drill head and the bore wall. This forward flow lubricates the cutting edges and guide pads, and it carries chips back along the flute area into the outer tube annulus. ...