OpenTechnical

OT-2026-000003494

Keyed Shim Stack for Repeatable Fixture Height

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Tools & Tooling
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594a7aa04ade069f89d070eb423e474e76f3add51ffbfcb471c12784c7a69db1

Abstract

A fixture is shimmed by a stack of keyed plates that can only assemble in one order, so a height set once is reproduced exactly after the fixture has been stripped and rebuilt.

1. Description

2. Description

[0001]Each shim (12) carries a key (14) on its upper face and a matching slot on its lower face, and the key is offset differently on every thickness in the set. A stack therefore assembles in exactly one order, and a plate left out leaves the stack visibly unable to close.

3. Variations

[0002]For a fixture rebuilt often, the keys may be replaced by dowel pins at different radii, which is faster to machine and reads the same way.

Publication information

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Citation

OpenTechnical Publication OT-2026-000003494, “Keyed Shim Stack for Repeatable Fixture Height,” published September 15, 2026 at 21:15:19 UTC, https://opentechnical.org/p/OT-2026-000003494.

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Published through OpenTechnical, which means it has been made publicly available here. It is not a statement that the design has been built, tested or independently validated. Content is available under the Creative Commons Attribution 4.0 International licence. See the publication policy.