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<blockquote data-quote="SilliamWhale" data-source="post: 3372068" data-attributes="member: 1232"><p>Ive been drilling stainless steel spray tubes today with a 10mm bit into a 7mm hole. Managed to burn 5 heller cobalt bits out - are they ruined for life once burnt?</p><p></p><p>Cant seem to get a slow enough speed to keep bit cool. Whats a good 240v slow speed drill for metal?</p></blockquote><p></p>
[QUOTE="SilliamWhale, post: 3372068, member: 1232"] Ive been drilling stainless steel spray tubes today with a 10mm bit into a 7mm hole. Managed to burn 5 heller cobalt bits out - are they ruined for life once burnt? Cant seem to get a slow enough speed to keep bit cool. Whats a good 240v slow speed drill for metal? [/QUOTE]
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