A practical decision framework for CNC shops to improve tool life, chip control, and productivity—only where it truly pays off.
Coolant through carbide drill bits feature precision-engineered internal channels running from the shank to the cutting edge. High-pressure coolant (typically 10–50 bar) exits directly at the tip—exactly where heat and chips are generated.
Compared to standard external flood cooling, internal coolant delivery offers measurable advantages in demanding CNC drilling operations.
Direct cooling: reduces cutting-zone temperature by up to 200°C
Superior chip evacuation: prevents packing and re-cutting
Improved lubricity: minimizes built-up edge (BUE)
Extended tool life: typically 2–3× longer in difficult applications
8 key scenarios when thru-coolant drilling makes sense
Quick decision rule
Benefits vs. drawbacks
Implementation tips
Real-world aerospace case study
| # | Scenario | Why Use Thru-Coolant | Key Benefits | Typical Applications / Materials | Recommended Series |
|---|---|---|---|---|---|
| 1 | Deep Hole Drilling (L/D > 5×D) | Chips struggle to evacuate naturally; heat builds deep in the hole | Prevents chip packing, reduces peck cycles, improves straightness | Structural steel, aluminum stacks, L/D 10–30×D | Amony LXD Series + ICF |
| 2 | High-Speed Machining (>2000 RPM) | Higher surface speeds generate heat rapidly | Maintains edge sharpness, supports aggressive feeds | Titanium, Inconel, high-temperature alloys | Amony ICF Series |
| 3 | Difficult-to-Machine Materials | Sticky or abrasive materials cause BUE and rapid wear | Improved lubrication and cooling at the cutting interface | Stainless 304/316, HRSA alloys | Amony ICF Series |
| 4 | High-Volume Production Runs | Downtime from tool changes becomes costly | 2–3× longer tool life, consistent hole quality | Automotive components, aerospace parts | Amony UPX / ICF Combo |
| 5 | Precision or Tight-Tolerance Holes | Thermal expansion affects size and surface finish | Reduces thermal distortion, improves roundness | Medical devices, hydraulic fittings | Amony UPX Series (Coolant Option) |
| 6 | Poor Chip Formation Environments | Long, stringy chips overwhelm external cooling | Forces chips upward for stable evacuation | Aluminum alloys, low-carbon steels | Amony ICF Series |
| 7 | MQL or Near-Dry Machining | External coolant delivery is limited or absent | Ensures consistent lubrication at the cutting edge | Eco-focused shops, selected composites | Amony ICF Series |
| 8 | Stacked or Multi-Material Drilling | External coolant cannot penetrate between layers | Cools and lubricates throughout full depth | Composite-metal stacks, laminated parts | Amony LXD / ICF Series |
If your hole depth exceeds 5× diameter, you are running high speeds or feeds, or you are machining heat-sensitive or sticky materials—coolant through drilling is strongly recommended.
For shallow holes (<3×D) in mild steel with effective external flood cooling, standard carbide drills are often sufficient.
Tool life extension: 100–300% in deep-hole applications
Higher productivity: feeds increased by 20–50%
Improved hole quality: better roundness, fewer burrs
Reduced machine load and vibration
Higher initial cost (typically 20–50%)
Requires thru-coolant capable spindle and toolholder
More complex regrinding requirements
In most production environments, productivity gains offset the added cost—often within the first batch.
An aerospace supplier was drilling deep holes (15×D) in Ti-6Al-4V components. Using external coolant drills, they averaged only 80 holes per tool with frequent peck cycles.
After switching to Amony ICF Series coolant through drills, the process ran continuously at higher feeds. Tool life increased to 250+ holes per drill, peck cycles were eliminated, and cycle time dropped by 25%.
Result: 40% reduction in tooling cost and significantly more stable production.
Coolant through carbide drill bits are not a luxury—they are a necessity when heat and chip control limit efficiency. The key is using them only where the application demands it.
Explore our ICF and LXD coolant through series or contact us for a free application review, sample testing, or custom quotation.
Contact our experts today for a free quote or technical consultation.