buckeyefarmer
Epic Contributor
Anyone know where to find some 2" concrete bits? I've searched online and can't find any, except for core drilling machines. I have hammer drill.
2" holes in concrete
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CurlyDave
Elite Member
Depends what kind on hammer drill. I have a Bosch rotary hammer (sds plus) and just bought a 2" core drill set for ~ $150 from Amazon.
You need 3 separate pieces. The core drill, the shank which holds the core drill, and the point, which is used the start the hole and get a circular cut going, after which it is removed.
Shipping takes a week or so, but the price was right.
You need 3 separate pieces. The core drill, the shank which holds the core drill, and the point, which is used the start the hole and get a circular cut going, after which it is removed.
Shipping takes a week or so, but the price was right.
dcyrilc
Super Member
Scooby074
Super Member
the op might want to be seated when buying that bit.... its $400
id probably just go rent a core drill its a one time thing.
EddieWalker
Epic Contributor
When you say that you have a "hammer drll." Are you talking about those old fashioned drills that make a bunch of noise, but not really very good at drilling in concrete?
Or is it an SDS plus or SDS max drill?
My SDS plus is great for small holes half an inch or smaller. I use the hammer feature for taking out tile and removing morter too. Mine is a Makita, and it's a very good, lightweight tool.
My SDS max is a bigger Hitachi that can handle just about any sized bit. Ebay has Irwin bits, which are not what I consider quality, but for the money, probably decent deals.
Irwin Tools 325017 Drill Bit, 2 x 22, SDS-max One Piece - eBay (item 170571033973 end time Dec-25-10 10:30:57 PST)
I use my SDS max as a jackhammer more then a drill. Really a nice size for small projects.
If you have never uses SDS type hammers, they are just amazing. You don't have to use any force or pressure. Just pull the trigger and they just melt through the concrete!!!!!
Eddie
dcyrilc
Super Member
I have to agree with you Eddie. I have a Bosch for the light duty stuff and a 15+ year old Hilti for the heavy duty stuff. The Hilti's a heavy drill, but it will drill through just about anything. Like yours, it also has various chisel and hammer bits.
oldnslo
Super Member
If only doing a few holes can you rent a core drill cheaper than buying a bit?
Just a thought...
Roy
wroughtn_harv
Super Member
Even cheaper still for a hole or two would be to have a core driller do it.
I have a couple of Hiltis. The TE75 will do just about anything I want or need at this point in my life. I have bits up to three inch for it.
My TE 15C is the neatest tool since someone came up with a wrecking bar. I was drilling thousands of three eighths holes in a parking garage when I bought Hilti. It would drill a hole faster and with less effort than any other manufacturer.
If you look a the pond project where we anchored rod in granite blocks we found out something interesting about masonary drill bits. Hilti, 70 to 80 holes per bit. Anything bought at a box or hardware store (I don't see HD or Lowe as hardware stores) wouldn't do ten. That's seven sixteenths bits. Hilti out did them ten to one minimum.
As for Hilti pricing. They still have tier pricing. You walk in off the street and an item costs a hundred dollars. I get it for sixty. Volume buyers get it for less than that.
Personally I like tier priciing. It's an acknowledgement of loyalty and appreciation for loyalty and volume purchasing.
EddieWalker
Epic Contributor
I put a link up for that Irwn bit and after reading Harvey's reply, I wanted to clarify that I'm not a fan of Irwin products. I think they are bottom end and agree that if you get ten uses out of them, you are doing good. I haven't spent the money on Hilti, but found that Bosch makes good bits. There are a ton of DeWalt bits out there for the SDS type tools, but they don't last very long either.
Eddie
Eddie
Craig Clayton
Platinum Member
I enjoy drilling holes in concrete as a electrician, some people make a mess of it. If you have rebar then you need a diamond core drill. If you rent a machine you can get alot done. When the water starts to runs clear then you are on rebar,just slow down and wait, it will cut through. Some years ago on 1 job I drilled 700 2 " holes.
Craig Clayton
Craig Clayton
charlz
Elite Member
I rented a Hilti and 2" core type bit from Home Depot last year. I think it was about $50 for 4 hours... I really only used it about 5 mins making the hole You could get as many size bits as you wanted for the same rental fee. One of those things where it's best if you plan out all your holes in advance.
You could get as many size bits as you wanted for the same rental fee. One of those things where it's best if you plan out all your holes in advance.
QRTRHRS
Elite Member
I agree but I will say that I have some Irwin speed bore auger bits rated to cut nails if necessary. Mostly, I use them to bore PT fence posts for gate hardware but on occasion, have used them on barns and have cut nails. They have done quite well.
As for the concrete drilling, for limited use, I too say go rent the tools. Amazing how fast those SDS core bits will cut.
OP
buckeyefarmer
Epic Contributor
Thanks for the links. I used to have access to hilti rotary and hammer drills, yes they are nice and I know how they go thru concrete like butter. I don't have access to them anymore, that was a long time ago. I have a dewalt hammer drill I use with small bits, it drills with no problems. My neighbor the plumber has a large one he has said I can borrow, I just didn't want to wear down his bit. I have 10 holes to do, might hit rebar. I also can rent at HD.
dcyrilc
Super Member
Your best bet is probably to just rent what you need.
F250DSLPWR
Silver Member
Harbour Freight sells a $60 SDS hammer drill with carbide bits and they also have bit set available inexpensively. 1" is the largest bit. They do not have a bit for the standard SDS in 2", (you have to move up to SDS Max and it costs $$$- $$$$) but you can drill multiple small holes with this hammer drill in a circle and knock out the concrete slug. I have done that for water / electric pipes etc.. Works great and for the cost of a rental you now own tool. This tool is not the same as a drill with a hammer feature. The HF Hammer drill is a true SDS hammer drill.
CurlyDave
Elite Member
Drilling multiple holes in a pattern is a reasonable way to make a larger hole in sheet metal, possibly in wood, and maybe in other light thin materials.
I seriously doubt that anyone can make a presentable hole in concrete more than a few inches thick this way.
And, a 1" drill will never be able to make multiple holes that will end up 2" in diameter. Think about it. Two holes exactly side-by-side will end up 2" across, but when one tries to fill in the pattern, the drill will always wander into the previously drilled holes.
I seriously doubt that anyone can make a presentable hole in concrete more than a few inches thick this way.
And, a 1" drill will never be able to make multiple holes that will end up 2" in diameter. Think about it. Two holes exactly side-by-side will end up 2" across, but when one tries to fill in the pattern, the drill will always wander into the previously drilled holes.
