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Do-It-Yourself (DIY) Question & Answer Forum
whats the best?????
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<blockquote data-quote="ian932" data-source="post: 27424" data-attributes="member: 1533"><p>Its all to do with number of blows and the energy of each blow on a combi as with most high speed corded drills with a hammer option they hit fast and light at high rpm which results in your bit getting hot and burning out. where as the sds drills battery or corded are designed to hit hard and less times per revolution thus being more efficient and chipping through.</p><p></p><p>Here are the specs of 2 drills</p><p></p><p>Dewalt DC925 18v</p><p></p><p>Speed 1 - (0-7650 Blows per/min) @ 450rpm</p><p></p><p>Speed 2 - (0-25500 Blows per/min) @ 1500rpm</p><p></p><p>Speed 3 - (0-34000 Blows per/min) @ 2000rpm</p><p></p><p>SDS 2kg Hammer</p><p></p><p>(0-4000 Blows per/min) @ 1100rpm</p><p></p><p>You mention having a combi is it one of these?</p><p></p><p><a href="http://www.dewalt.co.uk/DWBrochureStorage/safety/ProductRecall_1.pdf" target="_blank">http://www.dewalt.co.uk/DWBrochureStorage/safety/ProductRecall_1.pdf</a></p></blockquote><p></p>
[QUOTE="ian932, post: 27424, member: 1533"] Its all to do with number of blows and the energy of each blow on a combi as with most high speed corded drills with a hammer option they hit fast and light at high rpm which results in your bit getting hot and burning out. where as the sds drills battery or corded are designed to hit hard and less times per revolution thus being more efficient and chipping through. Here are the specs of 2 drills Dewalt DC925 18v Speed 1 - (0-7650 Blows per/min) @ 450rpm Speed 2 - (0-25500 Blows per/min) @ 1500rpm Speed 3 - (0-34000 Blows per/min) @ 2000rpm SDS 2kg Hammer (0-4000 Blows per/min) @ 1100rpm You mention having a combi is it one of these? [URL="http://www.dewalt.co.uk/DWBrochureStorage/safety/ProductRecall_1.pdf"]http://www.dewalt.co.uk/DWBrochureStorage/safety/ProductRecall_1.pdf[/URL] [/QUOTE]
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