Appearance
Operator log books are the communication backbone of multi-shift deep hole drilling. Without a structured log, critical information — pressure changes, unusual sounds, tool changes — is lost between shifts. A five-minute log entry at shift end saves hours of troubleshooting later.
Why Operator Log Books Matter
In multi-shift deep hole drilling operations, three to five different operators may run the same machine in a week. Each operator develops feel for how the machine sounds, how the coolant pressure reacts to different materials, and which tools are nearing the end of their life.
Without a log book, this knowledge leaves with the operator at shift end. The incoming operator starts blind — unaware that the pressure has been creeping up, that a seal was replaced mid-shift, or that the last three parts had diameter variation at the far end.
A structured log book system captures this information in a format that is quick to record and easy to review. Over time, the accumulated data becomes a maintenance planning tool.
What to Record
Per-Part Records
| Record | Why It Matters |
|---|---|
| Part number and material | Tracks which jobs run on which machine |
| Hole diameter and depth | Confirms part specification met |
| Coolant pressure at start and end | Identifies pressure trends over hole depth |
| Feed rate and spindle speed | Documents actual cutting parameters used |
| Cycle time | Baseline for production planning |
Per-Shift Records
| Record | Why It Matters |
|---|---|
| Tools changed (drill, bushing, seal) | Tracks tool life and consumption rates |
| Coolant level and condition check | Prevents running with low or degraded coolant |
| Filter condition (pressure differential) | Early warning of clogged filters |
| Machine alarms or fault codes | Documents recurring issues |
| Unusual observations (noise, vibration, smell) | Early warning of impending failure |
Event Records
- Tool breakage with time and part count
- Coolant system leaks or repairs
- Power outages or interruptions
- Quality non-conformance reports
- Maintenance interventions (planned and unplanned)
Log Book Format
Paper Log Books
| Advantage | Disadvantage |
|---|---|
| Always available, no power needed | Hard to search historical data |
| Quick to fill in | Legibility varies between operators |
| No IT infrastructure required | Can be lost or damaged |
| Easy to train new operators | Data analysis requires manual entry |
Digital Log Books
| Feature | Benefit |
|---|---|
| Structured forms prevent skipped fields | Complete records every shift |
| Searchable database | Find past events in seconds |
| Trend analysis and charts | Identify gradual changes before failure |
| Photo attachment | Document visible issues (leaks, wear) |
| Automatic timestamping | Accurate event chronology |
Tip: A hybrid approach works well — a paper log at the machine for quick entries during the shift, with a digital summary entered at shift end for permanent record keeping.
Shift Change Procedures
Outgoing Operator Responsibilities
- Complete all log book entries for the shift
- Note any tools that are near end of life
- Identify any machine behaviour that is unusual
- Clean the machine area and organised tools
- Communicate directly with the incoming operator
Incoming Operator Responsibilities
- Read the entire log book from the previous shift
- Check current machine status (running, idle, faulted)
- Verify coolant level and pressure at startup
- Run a test part or check current part quality if machine is running
- Acknowledge handover and sign the log
Minimum Handover Time
| Shift Pattern | Recommended Overlap |
|---|---|
| 8-hour shifts | 10–15 minutes |
| 12-hour shifts | 15–20 minutes |
| Rotating shifts (changing schedule) | 20–30 minutes |
Common Shift Change Mistakes
| Mistake | Consequence | Prevention |
|---|---|---|
| Log book not filled in | Operator starts blind | Mandatory log completion before leaving |
| Vague entries ("ran fine") | No useful information | Structured forms with specific fields |
| Verbal handover only | Information lost if forgotten | Written log + verbal handover required |
| Skipping coolant check | Machine runs dry | Pre-shift checklist at startup |
| Not reporting tool wear | Tool breaks on next part | Log approximate remaining tool life |
Using Log Book Data for Maintenance Planning
Log book data accumulated over weeks and months reveals patterns that individual shift entries cannot. Tracking coolant pressure across shifts shows gradual pump degradation. Tool change records identify which materials wear tools fastest. Cycle time trends reveal when the machine needs attention.
| Data Point | What It Reveals | Action Trigger |
|---|---|---|
| Coolant pressure dropping over weeks | Pump wear or inlet filter clogging | Schedule pump inspection |
| Increasing tool consumption on one material | Material hardness variation or wrong tool spec | Review tool selection |
| Recurring alarm codes on same axis | Guideway wear or ball screw issue | Plan preventive maintenance |
| Cycle time increasing gradually | Accumulated drag or coolant temperature rise | Investigate root cause |
FAQ
How detailed should operator log entries be?
Detailed enough that another operator can understand the machine state without asking questions. A good rule: write as if the person reading it has never run this machine before. Include numbers and measurements, not just observations.
Should log books be paper or digital for deep hole drilling?
Paper is more practical at the machine — it survives coolant splashes, does not require clean hands to use, and is always available. Digital is better for long-term data analysis. A hybrid approach is recommended.
How long should operator log books be kept?
Keep completed log books for a minimum of 12 months, preferably 24 months for production analysis. Digital logs should be kept for the life of the machine. Check regulatory requirements — some industries require longer retention.
What is the most important thing to record on every shift?
Coolant pressure at the start and end of each part. Pressure changes are the earliest indicator of tool wear, bushing wear, pump degradation, and coolant system problems. Nothing else provides as much diagnostic information.
How do I get operators to actually fill in log books consistently?
Make it easy. Use structured forms with checkboxes and fill-in fields instead of blank pages. Explain why each field matters. Review log books during team meetings and recognise good entries. A log book that takes two minutes to fill in will be filled in consistently.
Operator log book and shift change procedures vary by shop size, number of shifts, and management system. Adapt these guidelines to your specific operation. This article reflects industry practice as of 2026.