PRIVACY & LIMITATIONS

Sheet-metal dimensions stay local. No CAM is connected.

01Enter outside chainT · R · K · angle
02Calculate locallyBA · OSSB · BD
03Total the flat≤30 bends
04Calibrate by couponK factor · CSV

Outside-virtual-sharp model, not blank approval

For up to 30 open bends between 0° and 180°, the tool calculates BA = θ(R + KT), OSSB = tan(θ/2)(R + T), and BD = 2·OSSB − BA, then subtracts BD from an outside-dimension chain; coupon inversion depends on the same convention. It does not support hems, closed bends, offsets, grooves, or intersecting bends, and does not model material lot or grain, springback, tooling or V-die, forming method, minimum flange, tolerance accumulation, hole distortion, or machine capacity.

Dimensions and coupon data may be production data

Refreshing or closing discards inputs. CSV contains each bend's angle, R, K, BA, OSSB, BD, and neutral radius; reports and optional local checkpoints read the visible result summary. Unreleased part dimensions and process coupons may be sensitive, so review them before sharing.

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Local report studio

The report studio reads only the workbench’s currently visible result summary for local preview, Markdown copy, JSON download, printing, and a SHA-256 fingerprint. It never reads input controls or original files and is not persisted unless you choose to download it.

Optional local checkpoints

Only when you explicitly choose Save does the tool write the visible result summary, time, and optional short label to this site’s browser storage, up to five entries. Imported files and input-control contents are never stored; you can export, restore same-tool checkpoints, or clear them at any time. Imports are limited to 128KB and validate the tool, timestamp, summary, and label of up to 80 characters.

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