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Machine Contact Large

Public Made by Adom

by adom

Adom Large press-fit machine pin contact (Ø2.62 hole / Ø4.40 ring, ~20.8 A)

adomadom-modularcomponentconnectormachine-contactpress-fit
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3D Model

Symbol & Footprint

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Contents

Machine Contact Large

Adom press-fit machine pin contact (Large) for the Adom modular electronics system. A machine contact (MC) is a 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 ties molecules to the workcell control panel and to each other on the 32mm scaffold grid. This page carries the KiCad + Fusion 360 .lbr library, STEP, and an interactive 3D view.

What it is and where it goes

Large machine contacts populate the base scaffold (an 18x18 grid of large contacts at 32mm pitch) and large-class molecules. Their role depends on where they sit. On the base scaffold they are purely mechanical - that grid is not electrically connected, so the contacts serve only as the mechanical mounting interface that molecules and scaffolds seat into. Everywhere else (molecules, user scaffolds) they are electromechanical - carrying power and signal between stacked boards in addition to providing the mechanical interface. Large contacts are pressed directly into the board, and also press into the tops of large machine pins so that pins, needles, and wires can be inserted into a stacked assembly.

Rating and wiring

Property Value
Current rating ~20.8 A (80% derated)
Mating wire 14 AWG solid core (precision-bent, enamel-coated)
Mates with Large machine pin tail (Ø1.85 mm), large needle, or 14 AWG solid-core wire
Grid pitch 8 mm (technical); 32 mm is a common implementation (e.g. the base scaffold)

The rating is contact-limited (a large machine pin can carry more, so the 20.8 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 Ø2.62 mm plated through-hole ringed by a Ø4.40 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) Ø2.62 mm dims sheet + footprint
Annular ring (copper pad) Ø4.40 mm dims sheet + footprint
Accepts pin tail Ø1.85 mm large pin tail (D5)
Head / flange OD approx Ø4.8 mm STEP / silkscreen
Overall body height approx 3.9 mm STEP

Press-fit hole sizes are still under validation (Caleb is testing). The Ø2.62 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: MachineContactLarge.lbr (EAGLE/Fusion, round thru-hole pad + contact symbol)
  • KiCad: MachineContactLarge.kicad_sym, MachineContactLarge.kicad_mod
  • STEP: MachineContactLarge.step; web 3D: MachineContactLarge.glb
  • Canonical adom-lbr JSON: MachineContactLarge.adom-lbr.json

Files

MachineContactLarge.glb 3D Model (GLB) MachineContactLarge.insertion.glb 3D Model (GLB) MachineContactLarge.step STEP CAD Model MachineContactLarge.kicad_mod KiCad Footprint MachineContactLarge.kicad_sym KiCad Symbol MachineContactLarge-hero.png Image MachineContactLarge.adom-lbr.json Data File MachineContactLarge.lbr EAGLE Library

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