MachineContactMedium - Medium Machine Contact
Public Made by Adomby adom
Adom Medium press-fit machine pin contact (Ø0.78 hole / Ø1.30 ring, ~6.4 A)
Machine Contact Medium
Adom press-fit machine pin contact (Medium) for the Adom modular electronics
system. A machine contact (MC) is a purely electrical receptacle pressed into a
plated through-hole on a molecule or scaffold. It accepts a machine pin (MP) tail, a
machine needle, or a bare wire, forming the solderless junction that carries power and
signals between molecules on the medium-class 2mm grid. This page carries the KiCad +
Fusion 360 .lbr library, STEP, and an interactive 3D view.
What it is and where it goes
Medium machine contacts are the most common electrical interface on small and medium molecules and on medium-class user scaffolds (which adapt the large base-scaffold grid down to medium spacing). They carry power and signal between stacked boards. Unlike machine pins, whose primary job is mechanical (the factory pincers grip them), a contact's function is purely electrical. Medium contacts are pressed directly into the board, and also press into the tops of medium machine pins so that pins, needles, and wires can be inserted into a stacked assembly.
Rating and wiring
| Property | Value |
|---|---|
| Current rating | ~6.4 A (80% derated) |
| Mating wire | 24 AWG solid core (precision-bent, enamel-coated) |
| Mates with | Medium machine pin tail (Ø0.51 mm), medium needle, or 24 AWG solid-core wire |
| Grid pitch | 2 mm within a row; separate rows at least 4 mm apart (pincer clearance) |
The rating is contact-limited (a medium machine pin can carry more, so the 6.4 A figure is set by the contact) and is quoted at an 80% derating for margin. The mating wire is solid core (the enamel coating implies this, but it is called out explicitly).
Mounting: press-fit into a plated through-hole
The contact presses into a Ø0.78 mm plated through-hole ringed by a Ø1.30 mm copper annular pad. It is a solderless press-fit; solder-assist is available via the ring of 300um jet-paste solder balls on the annular ring (Adom's solder-ball-layer standard, shown in the 3D view above, which also animates the press-fit insertion). The hole must be plated and fabricated to the drill spec below.
Dimensions
| Feature | Value | Source |
|---|---|---|
| PCB drill (plated, press-fit) | Ø0.78 mm | dims sheet + footprint |
| Annular ring (copper pad) | Ø1.30 mm | dims sheet + footprint |
| Accepts pin tail | Ø0.51 mm | medium pin tail (D5) |
| Head / flange OD | approx Ø1.4 mm | STEP / silkscreen |
| Overall body height | approx 1.7 mm | STEP |
Press-fit hole sizes are still under validation (Caleb is testing). The Ø0.78 mm drill here matches the current dimensions sheet and the shipped footprint; confirm against the latest dims sheet before committing a fabrication.
Files
- Fusion 360 library:
MachineContactMedium.lbr(EAGLE/Fusion, round thru-hole pad + contact symbol) - KiCad:
MachineContactMedium.kicad_sym,MachineContactMedium.kicad_mod - STEP:
MachineContactMedium.step; web 3D:MachineContactMedium.glb - Canonical adom-lbr JSON:
MachineContactMedium.adom-lbr.json
Provenance and related
- Original KiCad source:
adom-inc/adom-kicad-library(MachineContact + MachinePin). - Dimensions originate in
adom-inc/adom-tsci-library(lib/src/globals.ts), published as@tsci/adom-inc.libraryv1.2.1. That repository and the KiCad one above are private, so both links need org access. - Public KiCad PCM feed, installable without a login: Adom KiCad Library, at
https://wiki.adom.inc/adom/adom-kicad-library/pcm/repository.json - Dimensions: Adom "Machine Pin Dimensions" sheet. Usage and ratings: "White Paper: Molecule Design" (v1.0, September 2025).
- Mating pins: adom/machinepinmediumshort, adom/machinepinmediumstandard.
- Larger sibling: adom/machinecontactlarge.
CAD provenance and independent review
Audit by Codex Astra (AI). Per-file provenance, sources and checks documents the current file hashes, source or generation inputs, modifications, verification limits and unknown origins. AI-created models are identified explicitly; a wiki upload is not manufacturer verification.
Unresolved original provenance: symbol, footprint, step, glb. See the record before treating these as source-verified assets.
Report a component problem with the filename/hash and evidence.
Optional MPN-marked model, preview and provenance
Displayed model and review status
The main 3D viewer uses machinecontactmedium-hero-mpn.glb, derived from the reviewed machinecontactmedium-mpn.glb. The exact MPN is AI-added identification artwork, not a factory marking. Marking inputs, fit and licensing and source provenance remain applicable.
The hero applies only a 180-degree Z display rotation; no geometry is scaled. Use the original-frame marked STEP/GLB downloads for board assemblies. The rendered package and readable mark were reviewed; that does not establish manufacturer-exact dimensions, polarity, or native-tool qualification. Binding and file hashes.
Footprint-aware inspection hero
The current hero adds separate nonphysical reference layers: teal dashed copper boundaries at 50% opacity, silkscreen at 30% opacity and actual symbol pin names (unique pad numbers when unnamed) at 50% opacity. Orbit underneath to compare physical terminals, copper and pin1 marks. Copper outlines are not soldermask/paste. Existing MPN, materials, animations and lights are preserved. These helpers are excluded from board-use STEP/GLB files. Geometry, mapping and source hashes; pin-map input. Physical body can occlude seating-plane artwork; inspect the underside or isolate it. Generated display-font contours are not native fab artwork.