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Rotary hammer

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Tom

02-12-2001 13:26:12




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I have a Bosch Bulldog SDS type rotary hammer. It has been a very reliable tool up until yesterday. I was drilling a hole in 6 inches of concrete and the bit quit turning even though the motor continued to run. Later, I went back and tried it again and it seemed to work just fine. (Although, I made a point not bear down as much on the tool while actually drilling) Is there some sort of clutch inside this tool to prevent damage when drilling or is something wearing out? Any help is definitely appreciated.

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Dean

02-13-2001 09:58:55




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 Re: Rotary hammer in reply to Tom, 02-12-2001 13:26:12  
I have the same Bosch Bulldog and can assure you that the other folks are right. It has a clutch that protects the motor from being overheated when a dull drill bit is used. Some concrete can be very hard and will dull the bits easily. If it won't cut with a minimum amount of pressure, you need to sharpen the bit or buy a new one. And be sure to back the bit out of the hole every few seconds and blow out the dust. This helps the bit stay sharp and makes drilling much faster.

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T_Bone

02-12-2001 19:10:31




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 Re: Rotary hammer in reply to Tom, 02-12-2001 13:26:12  
Hi Tom, Your bits will last longer if you start the hole then add some water as a coolant and the dust won't be as bad. You do have to sharpen bits the same as you do drill bits. Just look at a new bit for proper angle and rake. As Woody said, don't use pressure, let the bit do the work. If you need pressure to drill then the bit is dull.

T_Bone



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Woody

02-12-2001 15:37:52




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 Re: Rotary hammer in reply to Tom, 02-12-2001 13:26:12  
Tom I'm a Maintenance Mechanic for the Portsmouth Naval Shipyard and I drill a lot of holes in concrete. A couple of hints- Don"t bear down hard on the drill, there is a clutch mechanism inside and if it gets hot enough it will burn out Let the tool do the work. Use a "Turkey Baster", a squeeze bulb with a hose attached to blow out the dust every inch or so or use a piece of tubing and blow with your mouth-cuts down on friction. And one more thing use hearing protection-once it's gone-it's gone. Good Luck, Woody

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