5S and Visual Management for Deep Hole Drilling Shop Floors

A deep hole drilling job shop with 6 BTA machines and 2 gun drilling machines was struggling with tooling chaos: gun drills and BTA heads were stored in drawers organized only by approximate diameter, requiring operators to sort through 20–40 tools to find the correct size. Drill tubes were leaned against walls, causing bends that degraded bore straightness. Coolant concentration was checked irregularly — filter changes were reactive, causing pressure drops that led to tool breakage. Setup times averaged 75 minutes because operators spent 20 minutes searching for tooling. A 5S and visual management program was implemented: gun drills organized in foam shadow boards by diameter with regrind status color tags, BTA heads stored in labeled drawers with tool identification cards, drill tubes stored horizontally on rack supports at 1-meter intervals, coolant monitoring stations with color-coded gauges and daily checklists, and shadow boards for setup tools at each machine. The results over 12 months: setup time reduced from 75 to 32 minutes (57% reduction), tool search time eliminated, drill tube damage reduced by 80%, coolant-related downtime reduced from 120 hours/year to 35 hours/year, and operator satisfaction scores improved from 2.8 to 4.5 out of 5. Total implementation cost: $18,500. First-year savings: $52,000 from reduced setup time, $14,000 from reduced tool damage, and $11,000 from reduced coolant downtime.

5S Implementation Zones for Deep Hole Drilling ​

5S Zone Map and Key Activities ​

FAQ ​

How does 5S apply specifically to deep hole drilling tooling organization? ​

Deep hole drilling tooling organization requires 5S systems tailored to the unique characteristics of BTA heads, gun drills, and drill tubes — standard machine shop tool organization methods are inadequate. BTA drill head organization — BTA heads are high-value tools ($600–$5,000 each) that must be tracked individually for regrind status, service life, and geometry. The recommended organization system: store heads in labeled drawers or divided bins by diameter (1 mm increments for precision, 2 mm increments for general-purpose). Each head should have a tool identification card with: head serial number, diameter (measured to 0.001 mm), number of regrinds remaining, last regrind date, and bore count since last regrind. The card is attached to the storage location — when the operator selects a head, they take the card to the machine and record the bore count. A visual status system: green tag = head is serviceable with > 5 regrinds remaining, yellow tag = 2–5 regrinds remaining (order replacement), red tag = last regrind (replace after this use). Gun drill organization — gun drills ($240–$600 each) are stored in foam shadow boards organized by diameter. Each shadow board has cutouts for individual drills with the diameter marked next to each position. The foam provides physical protection for the carbide tip — never store gun drills loose in drawers where they can contact each other and chip the carbide. A critical element: gun drills after regrinding have reduced overall length — the shadow board must accommodate drills of different lengths at the same diameter. Organize by full length in the primary position and shorter (reground) drills in a secondary position with the remaining length marked. Drill tube storage — drill tubes ($800–$2,400 each) are the most difficult tools to organize because of their length (3–12 meters). The standard: horizontal rack storage with V-shaped or U-shaped supports at 1-meter intervals. Each rack section is labeled with tube OD and length range. Each tube has a permanent identification number stamped on the connection end. The storage position is numbered, and a tube management record tracks each tube's service hours, straightness status, thread condition, and wall thickness. Never store drill tubes vertically — the tube's own weight causes permanent bowing over time. Never store tubes on the floor — floor storage causes tube damage from foot traffic and equipment. Setup toolkits — a key 5S innovation for deep hole drilling: create pre-assembled setup kits for each job family. The kit contains all the tools needed for a specific operation — drill head, guide bushings, wrenches, steady rest pads, and coolant fittings — in a labeled container. The operator retrieves the entire kit from the tool crib and returns it after the job, eliminating individual tool search time.

What visual management tools are most effective for coolant system monitoring? ​

Coolant system monitoring in deep hole drilling benefits significantly from visual management because coolant condition directly affects tool life, bore quality, and process reliability, but is often neglected due to competing priorities. The most effective visual management tools for coolant systems: color-coded pressure gauges — install pressure gauges at each machine with green, yellow, and red zones marked directly on the gauge face. For a BTA drilling operation with 80 bar operating pressure: green zone = 70–90 bar (normal operating range), yellow zone = 50–70 bar or 90–110 bar (caution — investigate), and red zone = below 50 bar or above 110 bar (stop drilling — immediate action required). The operator can tell at a glance whether the coolant pressure is acceptable without remembering the target value. Multiple operators at a single machine: mark gauge bezel at the normal reading to make deviation visible from a distance. Coolant concentration posted chart — post a visual chart at the coolant mixing station showing the correct refractometer reading for the target concentration. For a 10% emulsion concentration with a 1.0 refractive index coolant: target refractometer reading = 10.0. The chart shows green zone = 9.0–11.0 (acceptable), yellow zone = 8.0–8.9 or 11.1–12.0 (adjust soon), red zone = below 8.0 or above 12.0 (adjust immediately). Include a simple instruction: "To increase concentration: add concentrate to tank. To decrease concentration: add water to tank." Coolant filter status indicator — install a differential pressure gauge on the coolant filter with color-coded zones. Clean filter: differential pressure < 0.5 bar (green zone). Filter partially loaded: 0.5–1.0 bar (yellow zone — order replacement filter). Filter loaded: > 1.0 bar (red zone — replace filter immediately). Post the expected filter life in operating hours next to the gauge — the operator can verify that the filter is performing as expected. Coolant temperature indicator — install a temperature gauge on the coolant tank with zones: green zone = 20–30°C (normal), yellow zone = 30–35°C (check heat exchanger), red zone = above 35°C (process at risk — reduce cutting speed or increase cooling capacity). Visual checklist — a laminated daily coolant checklist at each machine: check coolant level (must be above pump suction line), check pressure at gauge (must be in green zone), check temperature (must be below 35°C), check for visible tramp oil on tank surface (remove if present), check coolant clarity (cloudy coolant indicates bacterial growth — schedule biocide treatment). The operator initials each item daily. The checklist is kept at the machine for supervisor verification during leader standard walks.

What shadow board system works best for gun drills and BTA heads? ​

The most effective shadow board system for gun drills and BTA heads uses foam tool organizers in tool crib drawers, with color-coded status indicators and tool identification cards. The system is designed to make tool condition, location, and availability visible at a glance. Gun drill shadow board — use closed-cell polyethylene foam (10–15 mm thick) cut to fit standard drawer sizes (typically 600 × 400 mm). Cut tool silhouettes using a hot wire cutter or CNC router — each silhouette matches the exact shape of the gun drill shank and tip. Arrange drills in the drawer by diameter, left to right (smallest to largest). Below each silhouette, mark the diameter in 6 mm high numbers using a label maker or paint pen. Above each silhouette, attach a color-coded status indicator: green dot — drill is new and unused, yellow dot — drill has been reground 1–2 times (serviceable), orange dot — drill has been reground 3–4 times (order replacement), red dot — drill is on its last regrind (replace after this use). The operator removes the gun drill from the shadow board and hangs a tool check card (a laminated card with the operator's name and date) on the empty hook. This makes it immediately visible who has which tool. When the drill is returned, the operator removes the card. If a drill is missing and no card is present, an investigation is triggered. BTA head shadow board — BTA heads are larger and heavier than gun drills (up to 20 kg for large diameters). A shadow board for BTA heads uses a heavy-duty tool cabinet with pull-out drawers and foam inserts. For very large BTA heads (> 100 mm diameter), a wall-mounted slotted panel with individual hooks may be more practical. Each BTA head has a tool identification card (laminated, 100 × 70 mm) attached to its storage position: head ID number, diameter (mm), number of regrinds remaining, last regrind date, and bore count at last regrind. The operator records the bore count on the card after each use. When the head reaches the regrind interval, the operator places the head in a red bin marked "For Regrind" and flips the card to red side. The tool crib attendant picks up heads from the red bin daily, arranges regrinding, and returns the head with a green card after regrinding. Critical dimension verification — for BTA heads, include a go/no-go gauge at the storage location: a ring gauge or snap gauge set to the minimum acceptable diameter. The operator verifies the head diameter against the gauge before taking it to the machine. This catches undersize heads (from wear or oversharpening during regrind) before they are used to drill a bore.

How is Sort (the first S) performed in a deep hole drilling tool crib? ​

Sort (Seiri) in a deep hole drilling tool crib follows a systematic process to identify and remove tools that are not needed for current operations. The process: establish criteria — define what makes a tool "needed" vs. "unneeded" for deep hole drilling tooling. Needed: tools used at least once in the past 6 months, tools required for scheduled upcoming jobs, and tools that are the primary tool for a specific operation (even if rarely used). Unneeded: broken or damaged tools beyond repair, tools for diameters no longer drilled, tools that have been superseded by newer designs, tools with more than 20 regrinds (gun drills) or 10 regrinds (BTA heads), and tools with no identifiable job or use. The 6-month criterion is specific to deep hole drilling job shops because tooling is specialized and may be used infrequently — a shorter period may result in re-purchasing expensive tools that are needed only occasionally. Red-tag process — attach a red tag to each tool that meets the unneeded criteria. The red tag includes: tool identification (tool type, diameter, serial number), reason for red tag (broken, obsolete, superseded, no use in 6 months), date tagged, and tagged by (name). Tools with red tags are moved to a designated red-tag holding area — a clearly marked location in the tool crib, separate from active tools. The holding area has a 30-day review period — if no one claims the tool or provides a justification for keeping it within 30 days, the tool is disposed of or sold. BTA head example — a set of 65 mm BTA heads: 12 heads total, but only 6 are actively used (the others are from a discontinued product line that ended 14 months ago). The 6 active heads have regrind counts of 2–5 (12 total regrinds remaining). The 6 inactive heads have regrind counts of 0–2 (newer, but unused). Red-tag decision: the 6 inactive heads are candidates for red tag — they have value but no current use. Decision options: offer for sale to another shop (recover value), move to a "mothball" inventory (tagged with a note about the product line — return to active if the product line is revived), or scrap if no resale market exists. Gun drill example — 8 mm gun drills: 20 drills in inventory, but the current workload requires only 8 mm × 600 mm and 8 mm × 900 mm lengths. The inventory includes 4 drills of 8 mm × 400 mm (too short for any current job). Red-tag decision: the 400 mm drills are short enough to be used for 600 mm depth if a longer drill is not available — but they have been in inventory for 18 months without use. Decision options: keep 2 as emergency backups (mark "emergency use only — max depth 400 mm"), dispose of 2 that are near end of life (multiple regrinds remaining < 3). After the Sort process, the tool crib should have only tools that are actively needed — and the reduced inventory makes the remaining tools easier to organize and find.

How is 5S Sustained in a deep hole drilling environment? ​

Sustaining 5S in a deep hole drilling environment requires a structured system of daily audits, leader standard work, and continuous improvement that accounts for the specific challenges of deep hole drilling — coolant residue, chip accumulation, and high-value tooling. Zone ownership — assign each 5S zone (machine area, tool crib, coolant system, material staging) to a specific operator or technician. The zone owner is responsible for: maintaining the zone's 5S condition, conducting the daily 5S audit, reporting issues that require maintenance or management support, and training new operators on zone standards. Zone ownership rotates every 6 months to prevent burnout and cross-train operators. Daily 5S audit — a 5-minute audit at the start of each shift using a simple scorecard. The audit checklist for a machine area: are the shadow boards complete (all tools present and in correct position)? Is the coolant pressure in the green zone? Are floor markings clear and unobstructed? Is the chip bin less than 75% full? Are work surfaces clean and free of debris? The audit uses a simple scoring system: 5 = perfect, 3 = minor issue (correctable in 5 minutes), 1 = major issue (requires management attention). A score below 4 triggers a corrective action. The scorecard is posted at the machine for transparency. Leader standard work — the production supervisor conducts a 15-minute 5S walk-through each day, visiting 2–3 zones. The supervisor checks: audit scores from the previous day, open corrective actions, zone condition (visual verification), and operator feedback on 5S issues. The supervisor documents findings on a leader standard work sheet and follows up on corrective actions from previous walks. The daily walk communicates that 5S is a management priority, not just an operator responsibility. Monthly 5S committee — a cross-functional team (one operator from each shift, the tool crib attendant, the maintenance technician, and the production supervisor) meets for 30 minutes monthly to: review audit score trends, identify recurring issues, plan improvement projects, and recognize top-performing zones. The committee chairs rotate quarterly to maintain engagement. Quarterly 5S event — a half-day event dedicated to a specific 5S improvement project. Example events: reorganize the gun drill shadow board system (adjust diameters based on usage patterns), improve the coolant monitoring station (add new visual controls based on operator feedback), or redesign the drill tube storage rack layout. The event includes a pre-event assessment, improvement activities, and a post-event assessment to measure the improvement. Recognition and consequences — zones that maintain an average audit score of 4.5+ for three consecutive months receive a recognition award (lunch, gift card, or public acknowledgment). Zones with an average score below 3.0 for two consecutive months trigger a management review to identify barriers and provide support. The emphasis is on support, not punishment — the goal is to identify and remove obstacles to maintaining 5S, not to blame operators.

Disclaimer: The 5S and visual management guidelines provided in this article are general recommendations based on lean manufacturing principles and industry practices. Specific 5S implementation must be tailored to the specific facility layout, tooling inventory, production volume, and workforce culture. 5S is a continuous improvement process — results vary based on management commitment, workforce engagement, and the consistency of sustainment activities. The authors and publisher assume no liability for any damages or losses arising from the use of this information — always adapt 5S methods to your specific operation and involve your workforce in the implementation process. Content is for informational purposes only and does not constitute professional management consulting advice. Verify all approaches with qualified personnel before implementation as of 2026.