
1) Metal forming
Found on
https://www.crosswordclues.com/clue/planishing

Planishing (from the Latin planus, `flat`) is a metalworking technique that involves finishing the surface by finely shaping and smoothing sheet metal. This is done by hammering with a planishing panel hammer or slapper file against a shaped surface called a planishing stake that is held in a vice or a mounting hole in a blacksmith`s beak anvil......
Found on
http://en.wikipedia.org/wiki/Planishing

• (p. pr. & vb. n.) of Planish • a. & vb. n. from Planish, v. t.
Found on
http://thinkexist.com/dictionary/meaning/planishing/

A hammering process done to give a smoother finish to a piece of metal.
Found on
http://www.encyclo.co.uk/local/22290

Process of toughening, smoothing and polishing metal by hammering it with a broad, smooth-faced hammer. Planishing removes marks made by any previous shaping of the piece and ensures uniform thickness of the metal.
Found on
http://www.encyclo.co.uk/visitor-contributions.php
Plan'ish·ing adjective & verbal noun from
Planish ,
transitive verb Planishing rolls (Coining) ,
rolls between which metal strips are passed while cold, to bring them to exactly the required thickness. Found on
http://www.encyclo.co.uk/webster/P/100

Producing a smooth surface finish on metal by rapid succession of blows delivered by highly polished dies or by a hammer designed for the purpose, or by rolling in a planishing mill.
Found on
https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/

The first stage in finishing the surface of plate before polishing, the removal of hammer marks which occur during raising is achieved with the use of a special flat-headed hammer.
Found on
https://www.encyclo.co.uk/local/21090

Producing a smooth surface finish on metal by rapid succession of blows delivered by highly polished dies or by a hammer designed for the purpose, or by rolling in a planishing mill.
Found on
https://www.unifiedalloys.com/resources/glossary/
No exact match found.