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  1. #1
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    21,135

    Electric (corded) hammer drills

    Last week, I did an HVAC job where I had to cut two 10x4 vent holes in the floor of rooms, through 4" of concrete. I do not do this often, however when I do it takes a LONG time (the first one was a little over an hour... the second was almost 2 hours due to rebar).

    While I was drilling, the chuck head (SDS style bit) loosed its grease seal and started throwing grease. I did finish the holes... however my gut instinct is this hammer drill is almost history (it is many years old).

    Generally, I use the hammer drill to cut holes for condensing furnace flues, ducts, and vents. I have been doing this with lots of 1/2" holes and use the chisel feature to chip out between the holes. I would like to use a hole saw for the PVC furnace vents though. I have lots of SDS bits.

    I was in HD today and looked at Makita, Bosch, and Hilti. The Hilti (HD is selling them off, they will not handle that brand anymore) is just too much $$$ for the amount I will use it.

    I kinda liked the Makita... yet am not sure if I want the 1" or 1-1/4"... The smaller one is a conventional design... straight drill with D handle at the back. The larger one is the angle design and appears more rugged. Price is $200 and $300... both come with a bonus 4-1/2" grinder.

    Does anyone have experience with these Makita hammer drills, are they durable, is the heavier one worth the extra $100, is the angle design a good idea or difficult to use?

    And if there is another brand I should look at, please suggest it.

    THX in advance for any suggestions.
    GA-HVAC-Tech

    Quality work at a fair price with excellent customer service!

    Romans Ch's 5-6-7-8

    2 Chronicles 7:14

  2. #2
    Join Date
    May 2010
    Location
    Canada
    Posts
    833
    Bosch makes very good corded tools. You should look into " Rotary Hammer Core Bits".

    You could also look at a smaller Core set up. We had a Shibuya at my old company and it worked very well. You can find them for $1000 on ebay every now and then. They weight very little and are very easy to use and you can just go right through the rebar.

  3. #3
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,665
    I did a 4 1/2" hole in my home for a bathroom vent.

    Rented a core drill and bit from the local tool rental place.

    Was about $85 bucks. Did the job in under 10 minutes and made a perfect hole.


    As for replacing your drill, I used to work with a guy who had a Bosch. He was quite happy with it. I never had much opportunity to use it.

  4. #4
    Join Date
    Aug 2005
    Location
    iowa
    Posts
    1,649
    A buddy of mine has a tool repair business.... he swears by the bosch, but he does fix all of the rest... the bosch I picked out was the splined style (heavier duty) and was about 4 hundy.

  5. #5
    Join Date
    Aug 2012
    Location
    NE wisconsin
    Posts
    402
    I have a Makita cordless hammer drill for the small stuff, works good, I've used a masterforce (menards store brand) drill worked well lots of power but the chuck wore out after a couple months and would not stay tight only used it on holes less then 1". For cored holes for vents and such I have a Milwaukee rotary hammer 3 and 4 inch core bits no problem and fast to, but core bits really slow down when you hit rebar

  6. #6
    Join Date
    Sep 2012
    Location
    NW Louisiana
    Posts
    159
    I have gone Bosch for all corded and cordless tools. 3 year warranty, even for commercial. I stripped low range out of my 18V Brute Drill with about 40 days left on warranty. I abuse it pushing much larger bits and hole saws than it is designed for. Called, sent it in, they paid freight back, 1 week turnaround. I was impressed!

    CT

  7. #7
    Join Date
    Nov 2007
    Location
    Mississippi
    Posts
    1,347
    Anybody used a Bosch Bulldog Extreme? I have had my eye on one of these, but never used one.

  8. #8
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    21,135
    Quote Originally Posted by socotech View Post
    Anybody used a Bosch Bulldog Extreme? I have had my eye on one of these, but never used one.
    This is one of the ones I am looking at... the 1-1/8" rated unit... not sure what that means. My current unit (about to die) is a 7/8" rated unit.

    HD has it for about 2-1/2 bills.
    GA-HVAC-Tech

    Quality work at a fair price with excellent customer service!

    Romans Ch's 5-6-7-8

    2 Chronicles 7:14

  9. #9
    Join Date
    Nov 2007
    Location
    Mississippi
    Posts
    1,347
    Ebay has refurbished bulldog extreme for $150. My company replaces our tools when they wear out/break so thats good enough for me.

  10. #10
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    21,135
    Update... finally had time to do some online research... came across this item:

    http://www.amazon.com/Bosch-RH328VC-...=bosch+rh328vc

    Anyone have experience with this drill?

    THX in advance for any posts.
    GA-HVAC-Tech

    Quality work at a fair price with excellent customer service!

    Romans Ch's 5-6-7-8

    2 Chronicles 7:14

  11. #11
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,595
    We have a few bulldogs that we use but I don't know if they would do 4" of concrete.... The guy I ride to work with says the bulldog is as good as any of them.
    The Hilti we have is a beast but who can afford that?

  12. #12
    Join Date
    Feb 2011
    Posts
    81
    Well i have owned this little puppy 7.5 amps of pure joy and power always served me very well always never got a problem. Higly suggested
    http://www.amazon.com/Makita-HR2475-...+drills+corded

  13. #13
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    21,135
    Quote Originally Posted by ryan1088 View Post
    We have a few bulldogs that we use but I don't know if they would do 4" of concrete.... The guy I ride to work with says the bulldog is as good as any of them.
    The Hilti we have is a beast but who can afford that?
    Agree... Hilti are just too much $$$. HD quit carrying them in my area... there were a few discounted ones... still lots of $$$.
    GA-HVAC-Tech

    Quality work at a fair price with excellent customer service!

    Romans Ch's 5-6-7-8

    2 Chronicles 7:14

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