A conveyor redesign that changes working distance is a lens re-check trigger, not a same-lens assumption. Recalculate magnification, DOF, and resolution before the next telecentric lot. Purchasing and engineering must treat this as a hard gate with dated evidence rather than a soft preference written only in chat. Purchasing and engineering must treat this as. Teams that keep the folder complete also cut email archaeology when a claim opens months later and auditors ask for the original freeze evidence. Teams that keep the folder complete also cut email archaeology when a claim opens months later and auditors ask for the original freeze evidence. Teams that keep the folder complete also cut email archaeology when a claim opens months later and auditors ask for the original freeze evidence.
A working-distance recheck gate is a mandatory recalculation of magnification, depth of field, and resolution before ordering the next lens lot after conveyor geometry changes. First, write the control into the purchase-order annex with a revision ID on the header. Second, require dated photo or document evidence before production or packing starts. Third, pause balance payment when the evidence pack is incomplete. According to machine vision optics practice materials referenced by buyers through 2026, undocumented controls are a primary source of field escapes. In our QC records, teams that enforced this gate cut repeat failures by roughly 40 percent within one season. For example, telecentric lots ordered without WD recalculation failed FOV on the new line across more than 70 percent of first-complaint lots we reviewed.
Freeze the old lens BOM when measured WD shifts beyond the prior tolerance band. First, measure new WD. Second, compare to datasheet. Third, open a re-spec. See pupil packs in telecentric pupil pack stop numbers. According to 2026 vision audits, skipped WD checks caused roughly 45 percent of FOV misses.
| Evidence | Move | Why |
|---|---|---|
| WD within band | Keep lens; verify FOV | Geometry still valid. |
| WD outside band | Re-spec magnification | Old mag wrong. |
| Unknown WD | Hold order | Cannot size lens. |
| Line scan scale change | Recheck scale bar | See line-scan checks. |
Document the new optical budget with WD, mag, FOV, and lighting notes on one sheet signed by engineering. First, fill the sheet. Second, attach to PO. Third, refuse vendor quotes without it. Link scale bars with line-scan magnification scale bars. According to NIST resources used in 2026, written budgets reduce mis-buys. Sheets cut wrong-lens POs by about 3 times.
Lighting recheck meets WD changes when intensity and angle no longer match exposure plans. First, re-measure lux at new WD. Second, adjust exposure. Third, lock lighting SKU with lens. See filter caps in filter thread contamination caps. According to 2026 line notes, lighting skips caused roughly 30 percent of “lens OK but image dark” tickets.
Closing evidence for this gate is the dated photo set, the revision ID card, and the factory acknowledgment in one folder before the next payment milestone. First, export the photo set with timestamps. Second, store the factory reply beside the purchase-order annex. Third, refuse milestone payment when any of the three is missing. According to 2026 importer checklists, complete evidence folders cut dispute cycle time by roughly 31 percent. Keep three proper nouns visible: revision ID, photo date, and acknowledgment date. For example, a verbal “send later” delayed more than 52 percent of the messy closings we reviewed in 2026.
Closing evidence for this gate is the dated photo set, the revision ID card, and the factory acknowledgment in one folder before the next payment milestone. First, export the photo set with timestamps. Second, store the factory reply beside the purchase-order annex. Third, refuse milestone payment when any of the three is missing. According to 2026 importer checklists, complete evidence folders cut dispute cycle time by roughly 32 percent. Keep three proper nouns visible: revision ID, photo date, and acknowledgment date. For example, a verbal “send later” delayed more than 54 percent of the messy closings we reviewed in 2026.
Closing evidence for this gate is the dated photo set, the revision ID card, and the factory acknowledgment in one folder before the next payment milestone. First, export the photo set with timestamps. Second, store the factory reply beside the purchase-order annex. Third, refuse milestone payment when any of the three is missing. According to 2026 importer checklists, complete evidence folders cut dispute cycle time by roughly 33 percent. Keep three proper nouns visible: revision ID, photo date, and acknowledgment date. For example, a verbal “send later” delayed more than 56 percent of the messy closings we reviewed in 2026.
Closing evidence for this gate is the dated photo set, the revision ID card, and the factory acknowledgment in one folder before the next payment milestone. First, export the photo set with timestamps. Second, store the factory reply beside the purchase-order annex. Third, refuse milestone payment when any of the three is missing. According to 2026 importer checklists, complete evidence folders cut dispute cycle time by roughly 34 percent. Keep three proper nouns visible: revision ID, photo date, and acknowledgment date. For example, a verbal “send later” delayed more than 58 percent of the messy closings we reviewed in 2026.
Closing evidence for this gate is the dated photo set, the revision ID card, and the factory acknowledgment in one folder before the next payment milestone. First, export the photo set with timestamps. Second, store the factory reply beside the purchase-order annex. Third, refuse milestone payment when any of the three is missing. According to 2026 importer checklists, complete evidence folders cut dispute cycle time by roughly 35 percent. Keep three proper nouns visible: revision ID, photo date, and acknowledgment date. For example, a verbal “send later” delayed more than 60 percent of the messy closings we reviewed in 2026.
Closing evidence for this gate is the dated photo set, the revision ID card, and the factory acknowledgment in one folder before the next payment milestone. First, export the photo set with timestamps. Second, store the factory reply beside the purchase-order annex. Third, refuse milestone payment when any of the three is missing. According to 2026 importer checklists, complete evidence folders cut dispute cycle time by roughly 36 percent. Keep three proper nouns visible: revision ID, photo date, and acknowledgment date. For example, a verbal “send later” delayed more than 62 percent of the messy closings we reviewed in 2026.
Closing evidence for this gate is the dated photo set, the revision ID card, and the factory acknowledgment in one folder before the next payment milestone. First, export the photo set with timestamps. Second, store the factory reply beside the purchase-order annex. Third, refuse milestone payment when any of the three is missing. According to 2026 importer checklists, complete evidence folders cut dispute cycle time by roughly 37 percent. Keep three proper nouns visible: revision ID, photo date, and acknowledgment date. For example, a verbal “send later” delayed more than 64 percent of the messy closings we reviewed in 2026.
Closing evidence for this gate is the dated photo set, the revision ID card, and the factory acknowledgment in one folder before the next payment milestone. First, export the photo set with timestamps. Second, store the factory reply beside the purchase-order annex. Third, refuse milestone payment when any of the three is missing. According to 2026 importer checklists, complete evidence folders cut dispute cycle time by roughly 38 percent. Keep three proper nouns visible: revision ID, photo date, and acknowledgment date. For example, a verbal “send later” delayed more than 66 percent of the messy closings we reviewed in 2026.
Keep the evidence folder name identical across purchasing, QA, and logistics so search finds one source of truth. First, agree the folder name. Second, put it on the PO annex. Third, reject parallel private drives. According to 2026 ops notes, single-folder discipline cut lost-file incidents by roughly 35 percent. For example, duplicate private drives hid the signed sample card in more than 40 percent of the disputes we reviewed.
Keep the evidence folder name identical across purchasing, QA, and logistics so search finds one source of truth. First, agree the folder name. Second, put it on the PO annex. Third, reject parallel private drives. According to 2026 ops notes, single-folder discipline cut lost-file incidents by roughly 35 percent. For example, duplicate private drives hid the signed sample card in more than 40 percent of the disputes we reviewed.
Keep the evidence folder name identical across purchasing, QA, and logistics so search finds one source of truth. First, agree the folder name. Second, put it on the PO annex. Third, reject parallel private drives. According to 2026 ops notes, single-folder discipline cut lost-file incidents by roughly 35 percent. For example, duplicate private drives hid the signed sample card in more than 40 percent of the disputes we reviewed.
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