{"id":4225,"date":"2026-03-14T06:48:31","date_gmt":"2026-03-13T22:48:31","guid":{"rendered":"https:\/\/www.chuxin-smt.com\/?p=4225"},"modified":"2026-03-14T06:48:31","modified_gmt":"2026-03-13T22:48:31","slug":"smt-conveyor-capacity-planning-step-by-step","status":"publish","type":"post","link":"https:\/\/www.chuxin-smt.com\/sr\/smt-conveyor-capacity-planning-step-by-step\/","title":{"rendered":"How to Do SMT Conveyor Capacity Planning Around AOI, SPI, and Reflow Bottlenecks"},"content":{"rendered":"<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1773039029-image_1773038323-it8mkgtb.jpeg\" alt=\"Engineering schematic of an SMT line with SPI, reflow, AOI, buffers, and OK\/NG diverter with takt and Little\u2019s Law callouts\" class=\"wp-image-4223\" srcset=\"https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1773039029-image_1773038323-it8mkgtb.jpeg 1536w, https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1773039029-image_1773038323-it8mkgtb-300x200.jpeg 300w, https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1773039029-image_1773038323-it8mkgtb-1024x683.jpeg 1024w, https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1773039029-image_1773038323-it8mkgtb-768x512.jpeg 768w, https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1773039029-image_1773038323-it8mkgtb-18x12.jpeg 18w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" title=\"How to Do SMT Conveyor Capacity Planning Around AOI, SPI, and Reflow Bottlenecks - S&amp;M Co.Ltd\" \/><\/figure>\n\n\n\n<p>High\u2011mix builds make takt wobble. SPI and AOI introduce review loops, reflow sets a hard dwell window, and frequent changeovers spike variability. This step\u2011by\u2011step guide shows how to plan SMT conveyor capacity\u2014buffers, diverters, and belt speeds\u2014so your line keeps feeding the constraint and protects throughput (UPH) without ballooning WIP.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Key takeaways<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Align takt to the composite bottleneck (SPI\/AOI review variability plus reflow dwell) and use buffers to absorb shocks, not to hide problems.<\/p><\/li><li><p>Size buffers with Little\u2019s Law: protective WIP \u2248 arrival rate \u00d7 protection time \u00d7 (1 + safety factor), then tune with SPC.<\/p><\/li><li><p>Convert reflow profile windows to belt speed and effective takt before finalizing upstream buffer lengths.<\/p><\/li><li><p>Keep OK\/NG flows separate and interlocked (SMEMA\/Hermes) to prevent FIFO breakage and starvation\/blocking.<\/p><\/li><li><p>Validate with thermocouples, MES P95 cycle times, and buffer\u2011penetration KPIs; recalibrate after each changeover.<\/p><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Step\u2011by\u2011step SMT conveyor capacity planning checklist<\/h2>\n\n\n\n<p>Before you start changing hardware, ensure the plan follows a repeatable method you can audit later. The following steps implement SMT conveyor capacity planning in a way that aligns takt and buffers to the composite constraint.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 0 \u2014 Gather the right inputs before you calculate<\/h3>\n\n\n\n<p>Pull these from MES\/AOI\/SPI logs and from your equipment datasheets. You\u2019ll use them in every sizing step. Keep this concise; long shopping lists slow teams down.<\/p>\n\n\n\n<p>Collect: board\/panel size and panelization; target UPH per lane and number of lanes; board pitch or spacing; SPI\/AOI mean and P95 cycle times, review\/recall rate, coefficient of variation (Cv), and notes on program maturity; reflow zone lengths, allowable belt speed range, and validated profile metrics (ramp, soak, TAL, peak, cool); NG rate and re\u2011inspect policy; quarantine capacity or magazine counts; changeover frequency, first\u2011article approval time, recipe stabilization time; available accumulation length (m) before AOI and before reflow; bypass options and dual\u2011lane availability; SMEMA or Hermes handshakes and MES rules for FIFO\/block\u2011starve prevention.<\/p>\n\n\n\n<p>For conveyor fundamentals and typical edge\u2011clearance assumptions, see the engineering primer in the <a target=\"_self\" rel=\"follow\" class=\"link\" href=\"https:\/\/www.chuxin-smt.com\/sr\/pcb-conveyor-system-design-ultimate-guide\/\">PCB conveyor system design guide<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 1 \u2014 Translate UPH to takt and arrival rate<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Takt per lane (s\/board): Takt_lane = 3600 \u00f7 UPH_lane<\/p><\/li><li><p>Arrival rate per lane (boards\/s): \u03bb_lane = 1 \u00f7 Takt_lane<\/p><\/li>\n<\/ul>\n\n\n\n<p>If you run dual\u2011lane, do this per lane. It\u2019s common for one lane to become dominant due to recipe maturity or feeder layout; don\u2019t average away that reality.<\/p>\n\n\n\n<p>Why it matters: Little\u2019s Law links arrival rate to the protective WIP that keeps your constraint fed when inspection reviews spike or a short changeover stalls upstream loaders. For foundations and assumptions behind Little\u2019s Law, see the production\u2011system overview by the <a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/projectproduction.org\/journal\/littles-law-a-practical-approach-to-understanding-production-system-performance\/\">Project Production Institute<\/a> and classic lecture notes on L = \u03bbW from <a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"http:\/\/web.eng.ucsd.edu\/~massimo\/ECE158A\/Handouts_files\/Little.pdf\">UCSD<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 2 \u2014 Check reflow as a potential rate limiter (reflow dwell \u2192 belt speed \u2192 takt)<\/h3>\n\n\n\n<p>Reflow sets a physics\u2011driven lower bound on takt because boards must meet the validated dwell\/profile window.<\/p>\n\n\n\n<p>Core relationships (units consistent):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Dwell_time_per_zone (s) \u2248 Zone_length (mm) \u00f7 Belt_speed (mm\/s)<\/p><\/li><li><p>Total_profile_time (s) = \u03a3 zone dwells (preheat + optional soak + reflow\/TAL + cool)<\/p><\/li><li><p>Reflow\u2011derived takt (s\/board) must be \u2265 Total_profile_time, after accounting for board length and minimum spacing.<\/p><\/li>\n<\/ul>\n\n\n\n<p>Use solder paste datasheets to define acceptable windows, then profile with thermocouples before \u201clocking\u201d belt speed. Typical lead\u2011free guidance (examples): TAL often 45\u201360 s, ramp ~1\u20131.5\u00b0C\/s, and cooling limits specified; confirm with your chosen paste\u2019s PDS such as <a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/www.indium.com\/wp-content\/uploads\/2025\/03\/Indium8.9HFRV-Pb-Free-Solder-Paste-PDS-100328-R2.pdf\">Indium\u2019s Indium8.9HFRV Pb\u2011Free PDS<\/a> \u0438 <a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/www.aimsolder.com\/wp-content\/uploads\/legacy-files\/nc512_sac305_solder_paste_tds.pdf\">AIM Solder NC512 SAC305 TDS<\/a>. Practical overviews on reflow sizing and speed\/length relations are summarized in the <a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/www.surfacemountprocess.com\/reflow-soldering-process.html\">Surface Mount Process reflow guide<\/a>.<\/p>\n\n\n\n<p>If your effective feed demand pushes belt speed beyond what the profile allows, reflow\u2014not AOI\/SPI\u2014becomes the drum. Plan buffers upstream to protect it from starvation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 3 \u2014 AOI\/SPI variability and AOI buffer sizing with Little\u2019s Law<\/h3>\n\n\n\n<p>Inspection takt is not constant. Review loops, sensitivity changes, and first\u2011article tweaks inflate P95 and drive local WIP surges. Treat inspection as a service\u2011time distribution rather than a single number. Variability (Cv) and utilization raise queueing delay; by Little\u2019s Law, higher delay at fixed \u03bb implies higher protective WIP. This principle is standard Factory Physics\/Kingman (VUT) reasoning covered in operations literature such as the <a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/www.informs-sim.org\/wsc04papers\/141.pdf\">INFORMS WSC paper on variability<\/a>.<\/p>\n\n\n\n<p>Define a protection time window that covers typical surges\u2014e.g., the delta between P95 and mean inspection time, plus expected changeover disturbances. Then size the AOI buffer:<\/p>\n\n\n\n<p>Buffer_slots_AOI \u2248 \u03bb_lane \u00d7 Protection_time \u00d7 (1 + safety_factor)<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Start safety_factor at 0.2\u20130.4 for high\u2011mix. Increase if Cv is high or if changeovers are frequent; decrease after SPC shows shallow buffer penetration.<\/p><\/li><li><p>Keep OK flow FIFO. Route NG immediately off the main lane to avoid contaminating FIFO (see Step 5 on diverters).<\/p><\/li>\n<\/ul>\n\n\n\n<p>Use this section as your go\u2011to \u201cAOI buffer sizing\u201d reference when you adjust inspection sensitivity or update programs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 4 \u2014 Convert slots to linear meters and place buffers where they matter<\/h3>\n\n\n\n<p>Once you have slot counts, convert to physical length:<\/p>\n\n\n\n<p>Required_length (m) \u2248 Buffer_slots \u00d7 (Board_length + Gap) \u00f7 1000<\/p>\n\n\n\n<p>Where Gap is your minimum conveyor spacing setting (mm). Prioritize accumulation before AOI (absorbs review spikes and first\u2011article churn), before reflow (protects the drum from upstream takt wobbles), and in NG quarantine (holds false\u2011call surges without blocking the OK lane). If space is tight, dual\u2011lane accumulation with a shuttle\/merge can pack more protection time per meter. For merge\/split patterns, the <a target=\"_self\" rel=\"follow\" class=\"link\" href=\"https:\/\/www.chuxin-smt.com\/sr\/working-principle-shuttle-conveyor-smt-line-explanation\/\">working principle of a shuttle conveyor<\/a> explains lane transfers and gating logic.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 5 \u2014 Configure OK\/NG diverters and interlocks to prevent block\/starve<\/h3>\n\n\n\n<p>Keep OK and NG flows physically separated. NG goes to quarantine or immediate re\u2011inspect; OK stays FIFO to the next process.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Handshakes: With SMEMA (IPC\u2011SMEMA\u20119851), use Board Available \/ Machine Ready state logic to avoid pushing into a blocked downstream; Hermes (IPC\u2011HERMES\u20119852) adds board IDs and richer states (StartTransport, StopTransport, TransportFinished) over TCP so your PLC\/MES can enforce FIFO with traceability. Basics are outlined in the <a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/lcifurnaces.com\/Support\/21006manual\/10.3%20SMEMA-Standard.pdf\">SMEMA 9851 overview<\/a> and the <a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/www.the-hermes-standard.info\/wp-content\/uploads\/pdf\/2018-11_IPC-HERMES-9852_TheHermesStandard-BasicPresentation.pdf\">Hermes standard brief<\/a>.<\/p><\/li><li><p>Starvation control: Gate upstream feed when buffer penetration drops below a threshold; reopen once the constraint\u2019s pre\u2011buffer recovers.<\/p><\/li><li><p>Blocking control: When downstream is full for a grace period, hold transfers and route NG to quarantine rather than stalling the OK lane.<\/p><\/li>\n<\/ul>\n\n\n\n<p>This is where an \u201cOK\/NG diverter\u201d strategy pays for itself in stable flow.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 6 \u2014 Commissioning and verification you can trust<\/h3>\n\n\n\n<p>Reflow validation: Thermocouple the worst\u2011case board and verify ramp, soak (if used), TAL, peak, and cool against your paste PDS (see Step 2 sources). Lock belt speed only after passing.<\/p>\n\n\n\n<p>SPC on inspection: From MES\/AOI logs, compute mean, P95, and Cv each shift for SPI and AOI. Track review rate (%). Alert if P95 creeps or Cv spikes.<\/p>\n\n\n\n<p>Buffer KPIs: Monitor buffer\u2011penetration percentiles at pre\u2011AOI and pre\u2011reflow. If penetration routinely exceeds the designed protection time, expand slots or lift the safety_factor; if it barely gets touched, reclaim length.<\/p>\n\n\n\n<p>Handshake logging: Confirm SMEMA\/Hermes transitions and FIFO traces. Investigate any bypass events.<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Worked example \u2014 Dual\u2011lane line, composite bottleneck, and buffer sizing<\/h2>\n\n\n\n<p>Scenario (inputs from Step 0):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Lanes: 2<\/p><\/li><li><p>Target UPH per lane: 350 \u2192 Takt_lane = 3600\/350 \u2248 10.29 s\/board \u2192 \u03bb_lane \u2248 0.0972 boards\/s<\/p><\/li><li><p>Board length: 150 mm; Gap: 20 mm<\/p><\/li><li><p>AOI mean 7.5 s, P95 14 s; Protection_time = (P95 \u2212 mean) = 6.5 s<\/p><\/li><li><p>Changeover frequency: 3 per shift; add 15% extra protection for review surges \u2192 safety_factor start at 0.35<\/p><\/li><li><p>Reflow validated profile: Total_profile_time \u2248 70 s; belt speed and spacing yield reflow\u2011derived takt \u2248 10.5 s\/board (slightly slower than target takt)<\/p><\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><p>Constraint check: Reflow takt (10.5 s) is slower than nominal lane takt (10.29 s). Reflow is the drum. Align the line to \u226510.5 s.<\/p><\/li><li><p>AOI buffer sizing per lane: Buffer_slots_AOI \u2248 0.0972 \u00d7 6.5 \u00d7 (1 + 0.35) \u2248 0.0972 \u00d7 6.5 \u00d7 1.35 \u2248 0.853 \u2192 round up to 1 slot.<\/p><\/li>\n<\/ol>\n\n\n\n<p>In practice, 1 slot is too coarse for shock absorption. For high\u2011mix stability, set a floor of 3\u20135 slots per lane pre\u2011AOI even when math yields &lt;2, then tune via SPC.<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"3\">\n<li><p>Physical length per lane for 4 slots: Required_length \u2248 4 \u00d7 (150 + 20) \/ 1000 = 0.68 m. For dual\u2011lane, budget \u2248 1.36 m pre\u2011AOI.<\/p><\/li><li><p>Pre\u2011reflow buffer sizing (often needs more time): Suppose SPI\/PnP upstream cause 12 s of occasional starvation risk relative to the 10.5 s reflow takt. Use Protection_time = 12 s and safety_factor 0.35: Buffer_slots_reflow \u2248 0.0972 \u00d7 12 \u00d7 1.35 \u2248 1.57 \u2192 round to 2 slots per lane. Length per lane \u2248 2 \u00d7 (150 + 20) \/ 1000 = 0.34 m. Dual\u2011lane \u2248 0.68 m pre\u2011reflow.<\/p><\/li>\n<\/ol>\n\n\n\n<p>Neutral micro\u2011example (hardware fit, no performance claims):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>A short pre\u2011AOI accumulation using an <a target=\"_self\" rel=\"follow\" class=\"link\" href=\"https:\/\/www.chuxin-smt.com\/sr\/products\/conveyor-inspection-conveyor\/\">S&amp;M inspection conveyor<\/a> on each lane can provide the 3\u20135 slots you budgeted while preserving FIFO and a manual hold point for first\u2011article checks. If NG surges occur after sensitivity tweaks, route them to a small quarantine using an <a target=\"_self\" rel=\"follow\" class=\"link\" href=\"https:\/\/www.chuxin-smt.com\/sr\/products\/reject-conveyor\/\">S&amp;M reject conveyor<\/a> so the OK lane keeps feeding reflow. For oven parameters and process checks, see the <a target=\"_self\" rel=\"follow\" class=\"link\" href=\"https:\/\/www.chuxin-smt.com\/hr\/slug-a-comprehensive-guide-to-the-smt-reflow-oven-process\/\">SMT reflow process guide<\/a>.<\/p><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Troubleshooting and fast recovery<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Blocking at AOI exit or reflow exit: Increase downstream accumulation or add controlled\u2011release logic keyed to MachineReady\/Hermes state. If floor space is tight, consider a dual\u2011lane merge\/split with a shuttle.<\/p><\/li><li><p>Starvation before reflow: Raise pre\u2011reflow slots or throttle upstream feed less aggressively. Verify that AOI NG routing isn\u2019t stealing OK capacity.<\/p><\/li><li><p>False\u2011call flood after program tweaks: Quarantine NG on a side lane, escalate SPC review, and temporarily relax AOI sensitivity with engineering approval until the program stabilizes.<\/p><\/li><li><p>Profile drift after changeover: Re\u2011profile with thermocouples; realign belt speed within paste windows before releasing volume.<\/p><\/li><li><p>Handshake or diverter fault: Enable bypass path, alert the operator, and review SMEMA\/Hermes logs to isolate the failure.<\/p><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">A simple worksheet you can copy<\/h2>\n\n\n\n<p>Below is a compact field map to mirror in a spreadsheet. Units must be consistent.<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col \/><col \/><col \/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>Field<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Example value<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>\u0411\u0435\u043b\u0435\u0448\u043a\u0435<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>UPH per lane<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>350<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>From plan\/MES<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Takt per lane (s)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>10.29<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>3600\/UPH<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Arrival rate \u03bb (boards\/s)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>0.0972<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>1\/Takt<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>AOI mean\/P95 (s)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>7.5 \/ 14<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>From AOI logs<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Protection time (s)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>6.5<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>P95 \u2212 mean<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Safety factor<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>0.35<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Start 0.2\u20130.4; tune via SPC<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Buffer slots (AOI)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>1 \u2192 set 3\u20135<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Round up; set floor<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Board length + gap (mm)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>170<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Length + spacing<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Length for 4 slots (m)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>0.68<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Slots \u00d7 pitch \/ 1000<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Reflow profile time (s)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>70<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Verified by TC<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Reflow takt (s)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>10.5<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Speed \u00d7 spacing constraints<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Next steps for SMT conveyor capacity planning<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Validate your reflow window and belt speed with thermocouples before line balancing; keep inspection SPC live each shift. This is the backbone of SMT conveyor capacity planning in high\u2011mix environments.<\/p><\/li><li><p>If you plan to implement dual\u2011lane buffers, shuttles, or NG diverters, review lane layouts and gating logic with your controls team. For hardware references and dimensions, you can explore S&amp;M resources such as inspection conveyors, reject handling, and reflow process explainers on the company site. Start with the inspection conveyor page linked in the worked example above.<\/p><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Sources and further reading<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Little\u2019s Law in production systems: overview by the <a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/projectproduction.org\/journal\/littles-law-a-practical-approach-to-understanding-production-system-performance\/\">Project Production Institute (2024)<\/a>; academic framing in <a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"http:\/\/web.eng.ucsd.edu\/~massimo\/ECE158A\/Handouts_files\/Little.pdf\">UCSD notes on L = \u03bbW<\/a>.<\/p><\/li><li><p>Variability impact and buffering principles: see the <a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/www.informs-sim.org\/wsc04papers\/141.pdf\">INFORMS WSC variability paper<\/a> for queueing implications in manufacturing contexts.<\/p><\/li><li><p>Reflow windows and speed\/dwell linkage: <a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/www.indium.com\/wp-content\/uploads\/2025\/03\/Indium8.9HFRV-Pb-Free-Solder-Paste-PDS-100328-R2.pdf\">Indium8.9HFRV Pb\u2011Free PDS<\/a>; <a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/www.aimsolder.com\/wp-content\/uploads\/legacy-files\/nc512_sac305_solder_paste_tds.pdf\">AIM NC512 SAC305 TDS<\/a>; overview from the <a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/www.surfacemountprocess.com\/reflow-soldering-process.html\">Surface Mount Process reflow guide<\/a>.<\/p><\/li><li><p>Handshakes and interlocks: <a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/lcifurnaces.com\/Support\/21006manual\/10.3%20SMEMA-Standard.pdf\">SMEMA 9851 basics<\/a> \u0438 <a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/www.the-hermes-standard.info\/wp-content\/uploads\/pdf\/2018-11_IPC-HERMES-9852_TheHermesStandard-BasicPresentation.pdf\">Hermes standard intro<\/a>.<\/p><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Step-by-step guide to SMT conveyor capacity planning around AOI, SPI, and reflow bottlenecks\u2014calculate takt, size buffers, and configure OK\/NG diverters to maximize 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