Coolant pressure trending tracks the coolant pressure over time to predict when maintenance is needed. A gradual pressure decrease indicates a developing problem. A sudden pressure drop indicates a failure. I started doing this after a surprise pump failure cost me 16 hours of unplanned downtime in the middle of a rush job a few years ago. Since implementing the system, I have caught every developing problem before it became a breakdown. ...
If you are not collecting data from your deep hole drilling machines, you are flying blind. I have implemented data collection systems in a dozen shops, and every time the data revealed an opportunity that nobody expected. A machine that everyone thought was running at 85% efficiency was actually at 62% when you counted the coolant system downtime that nobody was tracking. What to Collect The starting point is spindle runtime, cutting time, and cycle count. These three numbers tell you utilization. Most machine controls already track these. The trick is pulling them out and storing them where you can analyze them. ...
Machine monitoring for deep hole drilling goes far beyond counting cycles and tracking runtime. The drilling process itself generates a rich set of signals that tell you exactly what is happening at the cutting edge. I have built monitoring systems that predict tool breakage three seconds before it happens, detect material hardness changes mid-bore, and flag coolant system degradation weeks before a failure. What to Monitor Process Parameters The four signals that give the most information about the drilling process are coolant pressure, coolant flow rate, spindle power, and feed force. These four parameters, plotted against time, create a signature for every drilling cycle. ...
I have broken more gun drills than I care to count. Every one of those breakages happened inside the hole where I could not see it coming. That is what drove me to build a real monitoring strategy — not just watching a spindle load bar on the control, but layering multiple signals so I catch wear, chip packing, and material anomalies before they snap the tool. Here is what I have settled on after years of testing different approaches. ...
Why Accelerometer Monitoring Matters A spindle failure on a deep hole drilling machine stops everything. The machine is down for days while the spindle is rebuilt or replaced. I use accelerometer-based vibration monitoring to detect bearing defects months before they cause failure, so I can schedule repairs during planned downtime. The accelerometer system cost is about 2000-5000 USD for a single machine. The value is in preventing unexpected spindle failures that cause extended downtime. A single emergency spindle replacement can cost 15,000-30,000 USD in parts and labor plus lost production time. ...
Spindle load monitoring uses the spindle drive current to measure the cutting load. Changes in the load indicate changes in the process. The drive amplifier converts the mechanical torque into an electrical current signal. The CNC reads this signal and displays it as a percentage of the drive’s rated capacity. In my experience, this single data stream catches more process problems than any other sensor on the machine. Establishing the Baseline I record the baseline spindle load for each job using a new tool. The baseline is typically 30% to 50% of the spindle drive capacity. I note the load for each stage of the cycle: entry, steady cutting, and exit. Each stage produces a characteristic load signature. ...
Vibration analysis measures the vibration at key points on the machine and identifies the frequency components. Each machine component rotates at a specific speed and produces vibration at a specific frequency. I have been running a vibration analysis program across twelve deep hole drilling machines for four years, and it has fundamentally changed how I approach maintenance. Measurement Points and Equipment I use a handheld vibration analyzer (Fluke 810 or equivalent) with a single-axis accelerometer that has a 100 mV/g sensitivity. I have standardized on seven measurement points per machine: ...