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Bosch 11248EVS 1-9/16-Inch 11 Amp Spline Combination Hammer | 
 enlarge | Brand: Bosch
Category: Home Improvement
List Price: $1,030.00
Buy New: $460.50
You Save: $569.50 (55%)
New (8) from $460.50
Rating:  3 reviews
Sales Rank: 26744
Media: Tools & Hardware
Shipping Weight (lbs): 14.4
Dimensions (in): 18 x 4 x 9
MPN: 11248EVS
Model: 11248EVS
UPC: 000346320916
EAN: 0000346320916
ASIN: B0000695HH
Shipping: Eligible for Super Saver Shipping
Availability: Usually ships in 24 hours
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| Features:
| • | 11-amp motor delivers 170-340 rpm and 1,700-3,300 bmp | | • | Constant response circuitry maintains speed under load and provides overload protection | | • | Vario-lock chuck allows for user positioning of chisel | | • | Vibration dampening handle for user comfort | | • | Turbo power delivers 20% more power in hammer only mode |
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| Editorial Reviews:
Amazon.com Product Description
This tough new spline drive combination hammer offers dual mode operation for hammering with or without rotation. It features a variable-speed 11 amp motor that provides 170 to 340 rpm and 1,700 to 3,300 beats per minute. It delivers 6.2 foot-pounds of impact energy in regular operation, and up to 7.4 foot-pounds in turbo mode. The tool's constant response circuitry ensures a soft start and a constant speed under load. Bosch also equips this hammer with a vibration-reducing handle, which makes the tool easier to work with for extended periods of time. The combination hammer also includes an indicator light to let you know when preventative maintenance is required and a power light that indicates when the tool is plugged in and ready for use. This hammer is 17-1/4 inches in length, weighs 14 pounds, and has a maximum bit size of 1-9/16 inches.
Product Description
Tool-free bit changes, automatic bit locking; Constant-Response Circuitry - soft-start, maintains constant speed under load, overload protection; Vario-lock for 12-way chisel positioning; Auto-Max variable speed dial; Turbo Power - delivers 20% more power in hammer mode only; Service Minder light - indicates when preventative maintenance is required; Shock absorbing handle - reduces user fatigue; Variable speed with constant speed under load and turbo power; 11 amp; 170-340 RPM, 1,700-3,300 BPM; Includes 360 auxiliary handle and case
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| Customer Reviews:
Well made and top notch hammer drill October 18, 2005
R. Foo (Vista, CA United States)
20 out of 20 found this review helpful
The Bosch 11248EVS is a rotary hammer drill using a spline drive for the drill bits. The capacity of this drill is 1-9/16" solid and 4" for the core drills. You also have capability to use other attachments such as a ground rod driver, chisels, etc. in the "hammer mode" (more on this later).
The house I moved into a few years ago was a basket case. It seemed that everything needed to be repaired or replaced. The time was right for me to find a rotary hammer drill.
There are different type of drives. There are: SDS, SDS-MAX and spline drives. As I understand it, SDS is for smaller diameter holes. SDS-MAX was designed for larger holes. It seems that spline drives seem to fall in between SDS and SDS-MAX drills. Any supplier of drills can supply you with drills and other accessories for your drill.
There is some debate if spline drives or SDS-MAX last longer. Some contractors claim the spline drive "teeth" shear off rendering the bit useless. So far I have not found any claim to be reliable and fault is with the user. The service centers find it is the abuse of the tool and contractors or whoever buying poor quality bits. I have used many spline drive bits all without fail.
This Bosch 11248EVS is a spline drive tool that has two operations. The first one being the rotary hammer drill. This is where a drill is rotated, much like any other drill, and then is struck with a "hammer" to pulverize the concrete or stone that you are drilling. During this operation the drill is struck thousands of times per minute with a force of about 7 foot pounds of energy. This means that each hit is the same as you raising a 7 pound hammer one foot and dropping it. May not seem like much, but remember that this is happening THOUSANDS of times per minute. In the case of the 11248EVS it is rated at 1700-3300 blows per minute and the bits rotates at 170-340 RPM.
If you use the tool in the hammer only mode you get a 20% boost in the hammering energy. To go from one mode to another you rotate a selector switch. In the hammer only mode you also can adjust the rotation of the tool in 30 degree increments. This is handy if you are using a spade bit and need to turn the bit for a better operating position.
The drill has a "soft start" feature in which the drill starts slowly and then comes up to full speed. This helps to keep the bit from walking. The speed can also be adjusted by rotating a small dial on the drill body for the maximum drill operating speed or by using the trigger. The more you squeeze the trigger the faster the drill will go. With some practice you can easily vary the speed. There is a "lock on" mode to keep the tool on all the time, but this feature works in the hammer only mode.
"Auto-Max" is a feature in which the drill is automatically set to the highest speed when the drill has been unplugged and then plugged in. I wasn't too sure if I liked or disliked this feature so I am somewhat neutral on it.
Drills are held in place by a very easy to use chuck. Pulling the locking collar of the chuck towards you unlocks the chuck. You insert the bit fully into the chuck and then release the collar. Pull on the bit and it is now locked into place. If you see red on the collar you have not installed the bit correctly. Take it out and try again. A few minuets fiddling with this and you'll be a pro. Bosch recommends using "bit grease" on the ends of the bits before putting it into the drill. You can buy this grease from Bosch or any of their service centers. You will greatly extend the life of the tool by doing this AND making sure the bits is clean going into the chuck. Wipe all and grime and grit off the spline teeth, inspect for any deformed or missing spline teeth, place a small amount of grease on the end and insert into the drill.
The 11248EVS uses 11 amps of current and has a 12 foot three prong cord. The Bosch 11248EVS is NOT a double insulated tool and it requires a GROUNDED circuit. This is NOT the time to be sharing the circuit with everybody else or you'll be making a trip to reset the circuit breaker. And... don't get cheap on the extension cord. Use a heavy duty cord rated for the drill. Use that heavy duty 14 gage or even a 12 gage cord for minimum voltage drop.
Hearing and eye protection is a must with any tool of this sort. You are drilling hard and very unforgiving materials with tools that are made of hardened and tempered tool steel and/or carbide tipped. The hammering action creates noise, vibration and dust! A dust mask is also recommended as the dust can cause health problems down the road.. There is a nice feature on the drill and that's the dampening handle. It is a spring loaded handle to help cut down on the vibration. Seems to work pretty well. I have used many other tools without and it's fatiguing.
The side handle must always be used as there is considerable torque produced. The clutch helps prevent the drill from getting away from you and spinning around without you holding it. Hopefully you'll have the presence of mind to let go of the trigger before 50 feet of power cord is wrapped around the drill! The handle can be positioned at just about any angle you desire.
A power indicator shows when the tool is plugged in and power is present. The other light is the service soon light. Once illuminated you have 8 hours of operation left and then the tools stops and will not work until taken to a service center. As far as maintenance is concerned, there really is not much to do. Keeping the case free of grime and the air vents clear of dust is about the only thing that one needs to do. The other maintenance is best left for the service pros, i.e. brush and bearing replacement and lubrication.
Actual use. When I got it I started out by drilling about seventy five 3/4" holes into 4 inch concrete. The speed is on par with other brands and may be a touch faster. The next test was driving ground rods. That was scary. Scary meaning how fast it did it. The first ground rod ran into hard pan soil and this took a while to get through. Driving it in with a sledge hammer bent the rod and made the rod useless so... that's when I tried the hammer drill method. To drive ground rods you'll need a ground rod driver and if you drive a lot ground rods you'll want this accessory in your tool kit! The hammer drill got it into the hard pan with much less effort than with the sledgehammer and it did not bend the ground rod into a pretzel. The second ground rod went into the ground like butter. I am totally sold. A 3-3/4" core bit was purchased to install a drain and this was done without too much fuss.
Hammer drills are about the most expensive tools around the remodeling or construction site. I've worked with many contractors and they say the Bosch is the tool that lasts. It is more money but in the long run they are well worth the extra cost.
The drill is about 15 pounds and comes with a fitted plastic case that has compartments for the drill, drill bits, and small accessories.
Excellent Hammer December 5, 2003
Mike Thompson (Norristown, PA)
3 out of 9 found this review helpful
Bosch is the best in terms of build quality and overall stability. I own several Bosch products, they are very impressive, including this combination hammer. I'm sure it will last a long time and can be counted on for performance everytime time it is needed. Very stable.
What a WOrkhorse! November 3, 2003
Clay Caldwell (Boise, ID)
4 out of 9 found this review helpful
Very durable, powerful, runs smoothly, one heck of a workhorse. I must say I'm so impressed.
Do yourself a favor, invest in this hammer, you will be glad you did! It is designed and built to last. The BEST of the BEST!
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