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sds rotary hammer advise

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We currently have a m18 fuel 1" 2712 , a dewalt 1" dch133, and over the years we've had multiple corded 1" sds rotary hammers as well.  For most of our work this size suits us very well as most of our concrete anchors are 3/8"-5/8" but more recently we've gotten into some bigger jobs that require 3/4" and 7/8" holes.  The 1" drills can drill these larger holes but its pretty hard on them because we're drilling 30-50 holes 10" deep one after another.  This isn't an everyday task as we typically set these larger anchors in wet concrete but a few times a year we get stuck drilling.  So I'm looking to add a larger rotary hammer for these jobs and my question is will a 1 1/8" drill be enough of a bump in performance or do I need to be looking at a sds max 1 9/16".   From the online reviews I've seen from places like OZ Tool Talk it looks like the bigger sds max drills don't really shine until you get up into holes over 1".  I think I want to go cordless as we have a pretty good collection of batteries and while I do like my milwaukee tools and the 2712,  it does seem that in most of the comparison videos I've seen the dewalt  rotary hammers are the better of the two.  Does anyone have any real world experience drilling 3/4"-7/8" holes and what size drill are you using?  I'm really thinking a m18 fuel 1 1/8" 2715 or the dewalt 20v 1 1/8" dch293  is what I want to go with and I think the dewalt might be a better drill but the dewalt is $400 and the m18 $300 right now.   

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Rule of thumb with a Roto hammer is the “rated” capacity of the drill say 1” for simplicity, the sweet spot of that drills power is around 1/2” holes, so what you need a larger SDS Max may be in your favor...

Devils advocate is the price worth the upgrade to the big gun if you’ll only pull it out a few times a year, may be better off with a more powerful SDS plus.


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I'm really thinking a m18 fuel 1 1/8" 2715 or the dewalt 20v 1 1/8" dch293  is what I want to go with and I think the dewalt might be a better drill but the dewalt is $400 and the m18 $300 right now.   



If you drill that many holes and $100 is even the slightest consideration or concern to you, you might want to raise your rates.

Buy whichever you like. Forget about the difference in price. Amortized over a year, you probably spend more on coffee.


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I've got the Dewalt sds max, 54 Volts of power, but it rarely comes out to play. Great fun when I need it though. This is the expensive route I think, not so bad if you're using the charger and batteries for other machines, still not cheap though. 

 

If it really is a rarity for you to need the extra grunt, perhaps a corded sds plus in the 5kg range would be a cheaper option for you? 

 

Hope some of that helps!

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I'm not necessarily looking to be cheap it's just that if milwaukee and dewalt are equal in performance in that size I have no reason to throw away $100.

 

I'm also not opposed to getting a bigger sds max but after watching Oz tool talk rotary hammer comparison I don't know if that's the answer.  It looks like the bigger hammers hit harder but have a lower bpm and on a 3/4" hole it looked like the 1 1/8" drills were faster.

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True, that did look the case in the comparison, but the difference will be that the max will be under almost no strain at 3/4", the plus machines will be nearing their upper limit. 

 

Also, I've had a couple of reliability issues with my M28 machines of late, so I'm backing away from the brand. The Dewalt machines have so far proven more reliable. 

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Yea we had plenty of trouble with dewalts back in the stick 18v days and then when we switched to the "20v max" slide pack batteries the first set we got had a switch go out on an impact and grinder when they were just over a year old and out of warranty.  We fixed the switches but it was at that point we started switching over to m18.  That was about five years ago and I would say while I still think milwaukee feels like its better quality, I have had to use the warranty more times than I'd like.  We've also grown our dewalt 20v line and had some other issues with newer tools but the original 5 year old set is all still running.  I've just come to the conclusion that every brand is going to have some problems when they're used and abused on a job site everyday.

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The problems I'm having are the hammer action on the M28 sds has stopped working, so that needs fixing. It's never had a hard life, never pushed beyond its design limits. 

 

The other problem is the M28 combi drill, the battery retaining clips are small and of poor design in my book. It's dropping packs, not impressive at this price point. 

 

On the subject of battery retainment, I'm finding the Dewalt sliders and Bosch 36 Volt sliders to be the best designs of all the machines I have. 

 

In other news I took the Flexvolt sds max out yesterday. Used it for some chases in masonry, a bit overkill for the task, but it made light work of it. 

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Yea it looks like the 54/60v sds max is the real deal especially compared to the milwaukee.  The 1 1/8" sds plus 54v from dewalt catches my attention but it's not available in the US, maybe it's not much different than the 18/20v.  

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I'm going to try and use it more in future, I'll let you know my thoughts on it as I use it. 

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