On Fri, 12 Apr 2013 08:25:48 +0100, "N_Cook"
wrote:

'scuse my ingnorance , but
do the magnets in the base really hold the drill static on to sheet steel,
opposing all the reactive torques and forces of large cutting bits?

Lots of videos showing such drills in action on YouTube:
https://www.youtube.com/results?search_query=hougen+magnetic+drill
If for some reason, the magentic base disconnects from the base metal
being drilled, a lift interlock switch will kill the power to the
drill motor. The usual mistake is to leave some chips or debris
between the magnetic base and the base metal.





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Jeff Liebermann
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