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32mm Hole through Girder
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[quote][i]Originally posted by ed[/i] I worked at a smithy for a while, whenever we needed to drill through thick plate we used a magnetic drill with plenty of cutting lube on the cutter. They don't use regular twist bits so they don't blunten and they fix in place via an electromagnet. This kind of thing: http://www.lawson-his.co.uk/scripts/products.php?cat=Magnetic%20Base%20Drills I'd try and get hold of one of those as it's what they're designed for... [/quote]
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