Glossary of industry terms T to Z
Tongue and groove split line - A type of split line that has male and female features cast or machined into it which locate with one another for alignment. They are sometimes supplemented with steel dowel pins and bushes.
Trim allowance (trim stock) - Material added to a moulding to complete the moulded one-piece wall, but which will be trimmed away after moulding. Frequently added between the cavities of a Gemini tool.
Thread plug - A part of a mould which forms a thread and must be removed from the mould before the part can be removed or turned out of the part after removal.
Toggle clamp - An over-centre type clamp used to hold mould parts together.
Tool (mould, mould tool) - Term used to describe the rotational mould tool used to produce the moulding.
Tooling feature - A hole or protrusion not functional to the basic piece part, but used later to locate the moulding for secondary work.
Undercut - A feature of a moulding which protrudes into or out of it and interferes with the removal of the part from the mould.
Universal plate (universal ring, universal spider) - A plate fabricated with a steel grid which allows "T" bolts to be used to fix the mould tool in many positions. Normally used for optimising the position of the tool relative to rotation axes during development prior to the production of the final tool framing.
Vent tube (air tube, breather tube) - A tube in the mould tool which extends into the inside of the moulding to allow the equalisation of pressure. Air moves out of the tool during the oven cycle and in during cooling helping to prevent mouldings with excessive flash, blow holes, faces distorted inwards.
Wear bush (insert bush, core pin bush) - A bushing made from steel or other hard material fitted to the mould tool where an insert or core pin is fitted to prevent wear of the mould wall.
Web (gusset) - A brace which is usually triangular for reinforcing a flange or mounting post cast or machined in the mould tool.
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