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ipass9
Oct 7, 2005, 6:21 PM
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Registered: Oct 17, 2004
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just wondering if anyone knows if there is a better bit to use on granite or other hard rocks my bits are not lasting.
thanks
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omenbringer
Oct 7, 2005, 6:26 PM
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Registered: Sep 19, 2003
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It might help to know what bits you are using currently, and also whether you are hand drilling or using the Bosch?
Also after how many holes are they dulling?
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saxonyclimber
Oct 7, 2005, 6:52 PM
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Registered: Jun 16, 2005
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I have had good luck drilling with the hilti bits with the cross tips (sorry I can't remember what they are called). They are expensive, but have performed very well for me when drilling with a power drill and drilling by hand in Yosemite
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fear
Oct 7, 2005, 7:58 PM
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Registered: Jun 16, 2003
Posts: 475
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Try drilling basalt if you think granite is hard....
-Fear
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jred
Oct 7, 2005, 10:15 PM
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Registered: Jul 27, 2003
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I have been using Hilti drill bits exclusively for about ten bits. I have found them to be the most durable of what is available to me. I would like to hear if any are better and if so where I could order them. Thanks.
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markguycan
Oct 8, 2005, 5:50 PM
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Registered: Sep 26, 2003
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yep hilti bits are a "bit" longer lasting, but I still only get 5-8 holes drilling in Quartzite :cry:
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lextalion
Oct 8, 2005, 11:09 PM
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Registered: Apr 28, 2005
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The Hilti or Bosch SDS Max cross tip bits are for cutting re-bar in concrete, these are the thing to use. Ain't cheap but the good things in life never are, but are work every penny.
I build custom homes and go thru these like people breath air, and both of these seem to last longer than any of the other brands out there. I'm not sure how I would feel using them in a hand drill for climbing, but then again luxury verses weight may be an issue.
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peterpan
Oct 9, 2005, 12:40 AM
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Registered: Mar 30, 2003
Posts: 36
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I drilled around a thousand holes, and concluded the Hilti cross-tip bit in combination with a high performance drill hammer action, such as offered by a Hilti drill, or the new Bosch, drills you most holes in a smallest amount of time. The same bit ages faster in a less efficient drill hammer.
The diameter matters too in terms of displacement performance. I found 10mm very good. Smaller clears less efficiently, larger takes too long.
This way, I am getting 30 to 40 holes out of a bit (subject to drill depth).
Of course after 15-20 holes the penetration speed is declining.
At times I found harder rock easier to drill because it chips better on bit impact. Some granites drilled easier than some limestones!
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