Press-Fit State#

Code	CG.018
Validator	Not yet implemented
Applies to	components with `pcba:component:processClass = press_fit` and their pins
Requirement level	CONDITIONAL (applies when a part is press-fit)
Tags	`component`, `process-class`, `solder`, `conditional`

Summary#

A press_fit part is a solderless through-hole part: its holes are plated, its barrels are real and required, and the camera looks down them. Which of its contacts take solder — and therefore which solder-defect classes apply — is determined per pin by pcba:pin:solderable, not by the part-level process class.

This page follows PCBA to USD Input Contract 1.0.2, sections 6, 10 and 12.

Description#

Press-fit is a third mount style alongside SMT and through_hole. This requirement adds no attribute; it fixes the conditional behaviour around the existing ones:

Describe the hole. A press-fit joint gets a board_barrel exactly like a soldered THT joint (BG.003), carrying the hole data and the pcba:board:refdes + pcba:board:componentPinNumber pair. Describing the hole and inspecting a solder joint are separate questions.
Decide solder per pin. processClass = press_fit is a useful part-level hint, but pcba:pin:solderable is the authority: a press-fit connector with one soldered ground pin is a real case that a part-level switch gets wrong in both directions. Downstream suppresses solder-defect classes where solderable = false and applies them where true.
Lead form is separate. pcba:pin:terminalType = pressFit describes the terminal form; it is neither the mount method nor the solderability.
No paste is authored for press-fit contacts unless paste-in-hole applies (BG.014).

Fields#

Attribute	On	Type	Req	Notes
`pcba:component:processClass = press_fit`	component	`token`	MUST for press-fit parts (CI.003)	Mount method; a hint, not the solder authority.
`pcba:pin:solderable`	each pin	`bool`	MUST (CG.007)	`false` on interference-fit pins; `true` on any pin that is soldered.
`board_barrel` at each joint	board	`Mesh`	MUST (BG.003)	Press-fit joints are described like any THT joint.

Why is it required?#

Injecting a solder defect on an unsoldered press-fit contact is physically meaningless and corrupts the ground truth; missing one on a soldered pin of a press-fit part loses a real defect class.
The hole is still what the camera inspects, so barrels cannot be skipped for press-fit parts.

Example#

def Xform "X1" (
    instanceable = true
    prepend references = @./protos/PRESSFIT_HDR.usda@</Proto>
)
{
    string pcba:component:refdes = "X1"
    token  pcba:component:type = "connector"
    token  pcba:component:processClass = "press_fit"
}

# In the prototype:
def Mesh "pin_1"
{
    token pcba:mesh:role = "pkg_lead"
    string pcba:pin:number = "1"
    bool pcba:pin:solderable = false
    token pcba:pin:terminalType = "pressFit"
}
def Mesh "pin_G"
{
    token pcba:mesh:role = "pkg_lead"
    string pcba:pin:number = "G"
    bool pcba:pin:solderable = true
}

How to comply#

Set pcba:component:processClass = press_fit on press-fit parts.
Author pcba:pin:solderable per pin — false for interference-fit pins, true for any that are soldered.
Author a board_barrel with the association pair at every press-fit joint.

No executable rule exists for this code; it is not part of the enforced feature set. The underlying attributes are checked by CI.003, CG.007 and BG.003.