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The first ground rod ran into hard pan soil and this took a while to get through. 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. Some contractors claim the spline drive "teeth" shear off rendering the bit useless. As far as maintenance is concerned, there really is not much to do. 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 next test was driving ground rods. There are: SDS, SDS-MAX and spline drives. don't get cheap on the extension cord. You insert the bit fully into the chuck and then release the collar. 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. A few minuets fiddling with this and you'll be a pro. 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.
You are drilling hard and very unforgiving materials with tools that are made of hardened and tempered tool steel and/or carbide tipped. A dust mask is also recommended as the dust can cause health problems down the road. This means that each hit is the same as you raising a 7 pound hammer one foot and dropping it. Hammer drills are about the most expensive tools around the remodeling or construction site. that's when I tried the hammer drill method. As I understand it, SDS is for smaller diameter holes. 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. Scary meaning how fast it did it.
If you see red on the collar you have not installed the bit correctly. Take it out and try again. It is a spring loaded handle to help cut down on the vibration. It seemed that everything needed to be repaired or replaced. A 3-3/4" core bit was purchased to install a drain and this was done without too much fuss. 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. There are different type of drives.
The service centers find it is the abuse of the tool and contractors or whoever buying poor quality bits. 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. The time was right for me to find a rotary hammer drill. And. Bosch recommends using "bit grease" on the ends of the bits before putting it into the drill.
Pulling the locking collar of the chuck towards you unlocks the chuck. The first one being the rotary hammer drill. May not seem like much, but remember that this is happening THOUSANDS of times per minute. Pull on the bit and it is now locked into place.
That was scary. Once illuminated you have 8 hours of operation left and then the tools stops and will not work until taken to a service center. The other maintenance is best left for the service pros, i.e. The more you squeeze the trigger the faster the drill will go. 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. With some practice you can easily vary the speed. The other light is the service soon light. The speed is on par with other brands and may be a touch faster.
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. 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. I am totally sold. When I got it I started out by drilling about seventy five 3/4" holes into 4 inch concrete. 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 hammering action creates noise, vibration and dust.
During this operation the drill is struck thousands of times per minute with a force of about 7 foot pounds of energy. 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. This helps to keep the bit from walking. In the hammer only mode you also can adjust the rotation of the tool in 30 degree increments. Seems to work pretty well.
The Bosch 11248EVS is NOT a double insulated tool and it requires a GROUNDED circuit. You can buy this grease from Bosch or any of their service centers. Driving it in with a sledge hammer bent the rod and made the rod useless so. I've worked with many contractors and they say the Bosch is the tool that lasts. The second ground rod went into the ground like butter. So far I have not found any claim to be reliable and fault is with the user.
You will greatly extend the life of the tool by doing this AND making sure the bits is clean going into the chuck. It seems that spline drives seem to fall in between SDS and SDS-MAX drills. The capacity of this drill is 1-9/16" solid and 4" for the core drills. in the "hammer mode" (more on this later).The house I moved into a few years ago was a basket case. brush and bearing replacement and lubrication.Actual use.
I have used many spline drive bits all without fail.This Bosch 11248EVS is a spline drive tool that has two operations. There is a nice feature on the drill and that's the dampening handle. 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. You also have capability to use other attachments such as a ground rod driver, chisels, etc. Use a heavy duty cord rated for the drill. SDS-MAX was designed for larger holes. To go from one mode to another you rotate a selector switch. 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.
Keeping the case free of grime and the air vents clear of dust is about the only thing that one needs to do. 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 Bosch 11248EVS is a rotary hammer drill using a spline drive for the drill bits. 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. The clutch helps prevent the drill from getting away from you and spinning around without you holding it.
I own several Bosch products, they are very impressive, including this combination hammer. Very stable. Bosch is the best in terms of build quality and overall stability. I'm sure it will last a long time and can be counted on for performance everytime time it is needed.
The BEST of the BEST. Do yourself a favor, invest in this hammer, you will be glad you did. Very durable, powerful, runs smoothly, one heck of a workhorse. I must say I'm so impressed. It is designed and built to last.
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