In this video i'll demonstrate using a block square and dial and dial test indicators to check whether the sides of a part are flat, parallel and perpendicular.

The document in the video is "BS 939:2007 Engineers squares (including cylindrical and block squares) - Specification", if you want to read a copy an internet search will bring up various sources for it.

Here's a link to my Ebay store supplying hand scrapers and carbide inserts, if you like the video and you'd like me to make more, or you're just happy that i don't starve and you're into scraping you can get your supplies here: [ Ссылка ]

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