Featured Snippet: Cycle Time (s/panel) = Holes x TimePerHit + IndexTime + LoadUnload
Free PCB drilling cycle time calculator. Estimate seconds per panel from holes, hit rate, index time and load/unload, then convert to panels per hour.
Suitable for:
Estimate seconds per panel.
| Cycle time | -- s |
| Drilling time | -- s |
| Panels / hour | -- |
Single-spindle estimate; multiply panels/hour by spindle count for the line.
Cycle time per panel decides line throughput. It is the sum of drilling time (holes x time per hit), index time between hits and load/unload. Process engineers use it to size capacity and spot where handling - not cutting - is the bottleneck. This tool returns seconds per panel and panels per hour for a single spindle.
On hole-rich HDI panels, drilling time dominates; on low-density boards, index and load/unload can be the bigger share. Raising hit count (better boards) lets you push hits per second without breakage, shortening the cycle. See our lubricant aluminum and backup board pages.
| Material | Throughput Impact | Hole Quality | Cost per Panel |
|---|---|---|---|
| UV Melamine backup board | High hit count | Excellent exit burr control | $$$ |
| HDF backup board | Standard hit count | Good burr control | $$ |
| Phenolic backup board | Moderate hit count | Good for back-drill | $ |
| Lubricated aluminum entry | +20-40% stack height | Excellent micro-via quality | $$$ |
| Standard aluminum entry | Baseline | Good universal protection | $$ |
Stable feed rate and clean exits are what let you push hit count without micro-drill breakage. Pair the right board with the parameters from this tool — see our backup board range and aluminum entry boards.
| Material | RPM | Chip load | Feed (m/min) | Entry | Backup |
|---|---|---|---|---|---|
| FR4 (standard multilayer) | 90,000 | 0.012 | 2.16 | Aluminum entry sheet | HDF backup board |
| HDI / micro-via | 110,000 | 0.008 | 1.76 | Lubricant aluminum | UV melamine 880 backup board |
| Rogers (high-frequency) | 80,000 | 0.010 | 1.60 | Aluminum entry sheet | Phenolic backup board |
| PTFE / Teflon | 60,000 | 0.008 | 0.96 | Aluminum entry sheet | Phenolic backup board |
| IC substrate (ABF) | 120,000 | 0.006 | 1.44 | Lubricant aluminum | UV melamine 950 backup board |
| Ceramic PCB | 50,000 | 0.008 | 0.80 | Aluminum entry sheet | Phenolic backup board |
| Aluminum PCB (IMS) | 40,000 | 0.010 | 0.80 | Aluminum entry sheet | Phenolic backup board |
| Copper-core PCB | 30,000 | 0.010 | 0.60 | Aluminum entry sheet | Phenolic backup board |
Figures are qualified starting points cross-checked with published fabrication guidance and supplier benchmarks — validate on your own panels.
Cycle time/panel (30k holes)
Representative field benchmarks for a 0.20 mm drill on standard FR4; actual results vary with stackup, machine and consumables — validate on your own panels.
Two planning views use the same numbers this calculator produces. For capacity, shops work backwards from available spindle hours: the drilling capacity calculation is spindles × shifts × usable minutes per shift ÷ cycle time per panel — which is why the panel-level cycle time, not the per-hit time, is the number that drives scheduling. For output commitments, the throughput calculation method is the same equation read forwards: expected panels per week. The reduction lever sits in the drilling routing itself — tool sequence, panel slot length in the program, drilling coordinates and process parameters — where fewer redundant hits, shorter rapid-travel paths and a validated drill speed per diameter shorten the cycle without pushing burr risk.
What is drilling cycle time? Total seconds to drill one panel: drilling + index + load/unload.
What is hits per second? Drilling rate; higher means less drilling time per panel.
What is index time? Time the spindle moves between holes; handling overhead, not cutting.
How do I shorten cycle time? Raise hits/sec (matched RPM/feed) and cut index/load time.
What is hit count? Holes per bit; better boards let you run faster without breakage.
What is throughput? Panels per hour = 3600 / cycle time, times spindle count.
What is a spindle? The drilling head; lines have multiple spindles per stack.
What is load/unload time? Time to place and remove the panel; a handling bottleneck.
What is drill breakage cost? Wasted bit plus scrapped panel; good support reduces both.
What is the difference between mechanical and laser? Laser micro-vias avoid bit handling for tiny vias but need laser capex.
How does material affect cycle? Abrasive materials need slower feed, lengthening drilling time.
What is panel utilization? How much of the panel area carries holes; dense panels drill longer.
Cycle time per hole is the sum of feed time (stack height / feed rate), retract time, and table positioning. Throughput (holes/hour) is the inverse of cycle time multiplied by spindle count. A move from 2-up to 3-up stacking can increase throughput by 50% — if the entry board supports it.
Excellon — PCB drilling machines ↗
Panel drilling cost = (drill bit cost + entry board cost + backup board cost + machine time cost + overhead) ÷ good panels out. Scrap from drilling defects often dominates the cost equation. Reducing breakage and burr defects through better consumable selection frequently pays for itself within weeks.
IPC — PCB cost factors (IPC-2221) ↗
First-pass yield in drilling is driven by positional accuracy, hole wall quality, and burr height. Defect rate calculators on this site help model the impact of parameter shifts. A 1% improvement in yield on high-layer-count boards can save thousands of dollars per month.
Sierra Circuits — Back-drilling ↗
Spindle utilization (actual drilling time ÷ total shift time) is the key machine efficiency metric. Unplanned downtime for drill breakage (15–45 min per event) is the largest utilization killer. Consistent consumable quality reduces breakage frequency and improves OEE.
Posalux — PCB drilling solutions ↗
Back-drilling requires controlled-depth accuracy ±0.05 mm to remove the stub without damaging the target layer. The entry board choice matters: a dedicated back-drill entry sheet with coating provides consistent Z-reference for depth registration and protects the surface from the larger back-drill bit.
YUESHAN — Back-drill depth control guide
Drill resharpening can recover 60–80% of original tool life at 30–50% of new bit cost. The decision to resharpen depends on the number of regrinds possible (typically 3–5 for micro-drills) and the quality requirement of the target holes. Resharpening is most economical for standard-diameter drills above 0.3 mm.
TTM Technologies — PCB fabrication ↗
Capacity planning angle: spindle sizes and hourly rates differ by machine class, but the consumable stack sets the ceiling on what any spindle can deliver. Throughput plans that assume a fixed spindle price while ignoring stack limits overstate real capacity; schedule panels per shift from the qualified hit count and stack height instead.
Process and CAM engineers use these numbers across demanding builds:
The right entry and backup board is what actually lets you hold a stable feed rate without breakage. Explore the product lines:
HDF, UV melamine and phenolic backup boards for stable exits and burr control.
Product Page →Plain and coated aluminum entry boards, including lubricated grades for micro-holes.
Product Page →Self-lubricating entry sheets that cool and center the bit on HDI / micro-via drilling.
Product Page →Coated back-drill entry sheets built for controlled-depth second-pass accuracy.
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