PR Hoffman
An insert carrier or lapping carrier is a workholding element used inside a double-sided planetary lapping or polishing system. The carrier holds parts in defined openings while the machine moves the carrier through the abrasive process zone between opposed working surfaces. The carrier helps control part spacing, exposure to the abrasive interface, and mechanical transport during material removal.
Carriers of this class are used where thin or precision parts need controlled two-sided material removal or finishing. Typical use cases include wafers, substrates, discs, and other flat parts that must be kept separated and guided through a planetary surfacing path. The carrier geometry is chosen to match the part shape and the process objective of lapping or polishing.
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The following facts about the 121T are absent from this record as of this revision. First-hand knowledge or a citation closes a gap; every submission is reviewed before publication.
No publicly documented production dates or lifecycle milestones (introduction, end of production, EOL) for the 121T are on record.
Answerable by: OEM historical records or a trade-press announcement
No publicly documented variants, configuration options, or revision breakpoints of the 121T are on record.
Answerable by: an OEM product catalog or an engineer who ordered or specified the tool
The control-system platform and OS era of the 121T are not on record.
Answerable by: an engineer who operated it or OEM installation records
No publicly documented failure modes or field errata for the 121T are on record.
Answerable by: a field service engineer, process engineer, or maintenance technician
The process node or technology generation of the 121T is not on record.
Answerable by: an OEM datasheet or a fab qualification report
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Last updated Oct 17, 2026.
PR Hoffman 106T is an insert carrier and lapping carrier type used with double-sided planetary lapping and polishing machines.