I need to drill about 8 5/16″ holes in precast CC, but I need the holes to be right on the money. In the past I’ve used a carbide bit and still had the bit walk around slightly. Center punching didn’t really help, same for drilling a pilot hole…it walked around too. The concrete has a rough surface if it matters.
Maybe some 1/4″ plate steel as a template? Any other suggestions?
Thanx
Replies
If you can't hold the bit centered by hand or a punch hole or pilot hole-you have the way to do it correct. I might use a pc of wood, thick enough to hold the bit and big enough to allow me to stand on it to hold it's position.
A great place for Information, Comraderie, and a sucker punch.
Remodeling Contractor just outside the Glass City.
Quittin' Time
I figured plate steel instead of wood in case the bit walked and hogged out the hole. Don't think it would hog out steel
go with Cal's plan and stop at the store and pick up a 1" Bosch SDS Buldog...
make like good for yur self...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!<!----><!---->
Forget the primal scream, just ROAR!!!
What's a 1" Bosch SDS Buldog...
hammer drill?
google didn't help
yes it is a hammerdrillsee this recent threadhttp://forums.taunton.com/tp-breaktime/messages?msg=76634.24
1"_SDS_Bulldogs_live_here
View Image
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!<!----><!---->
Forget the primal scream, just ROAR!!!
Maybe my BIL can hook me up with one? You got one you can send?...I'll cover the freight bothways
The aluma pole set up ran the well dry at least until next year
I have a milwaukee hawk I'll sell cheap if you cover freight.
Headstrong, I'll take on anyone!
That's the real problem...I'm cheap<g>
Thanks anyways, my BIL hooked me up with a Milwaukee
ck yur mail...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!<!----><!---->
Forget the primal scream, just ROAR!!!
Give me a spell, I will...busier than a cathouse in Vegas right now and I don't need to get nailed goofin on the net
OK...
a buck and a half ain't bad for the recon one, but still too rich for my blood right now.
I'm hoping my BIL has one...he just might? I know where you stand for Bosch but what makes that one better than any other name brand?
It's better because IMERC get's a royalty from all Bosch sales he makes ;)
One of the rags recently published a review of 1" SDS drills, but I don't recall the details or where Bosch landed.
As many as he has(had?) of the Bosch toys...I wouldn't be surprised if he was a major share holder.
;)
I saw that article, it was for the bigger rotary hammers. I think the Hitachi actually came out on top for surprisingly fast drilling speed. Bosch was high up there to, but the Hitachi blew everyone away.Rebuilding my home in Cypress, CA
Also a CRX fanatic!
nah, this was for 1" SDS, but for hte life of me I can't find it again....
There's basically Hilti, Bosch and everything else. I'd say most of us would spring for a Hilti if we had the money to spare, but an equivalent Bosch hammer is about 40% cheaper and 99% as good.
I have a 1-9/16" Bosch SDS-Max hammer and those holes, template or not, would take me about five minutes - three for layout and two to drill all eight. You really want to be doing this with a hammer drill and a *good* bit. DeWalt and Bosch make good bits. Borrow or rent the tool and go to HD and get a decent bit.
I don't know about HD bits???
IMO...and experience using them...junk!!
maybe it's just me, but it's what I've found with the CC bits
No, no, no. Home Depot (HD, aka Agent Orange) sells Bosch hammer drill bits (at least around here they do). Your mileage may vary. The point is, get a name brand.
"Bosch hammer drill bits"
oh...you mean those!
duh...I thought you meant Agent Orange bits.<g> I'll have to take a closer look next time, but I don't think I've seen anything other than the junk bits
Think he means buy a Bosch or Hilti bit from HD.
Might be able to rent the Hilti or Bulldog there as well.
Good luck, let us know how it goes.
BTW, if you don't mind me asking.....
what's the job?
"It's always better to have regrets for things you've done than for things you wish you had done..........."
Yeah, I guess I missed that...
I'm just replacing a bulkhead door for the basement. I went through this once already when I removed the existing Bilco steel door to sand blast & paint a couple years ago. I couldn't really get an accurate hole placement, so I had to hog the holes on the door base a little. It was a little bit of a hack job, but turned out to be a waste of time. Even though it was sealed perfectly, I still had water leaks. Wind blown rain was still finding it's way in around the door edges. I sat through a heavy rain and watched where it leaked.
The door I'm installing is a fiberglass unit that is similar in design to a car trunk lid. It kicks azz IMO and this will be my last attempt at making it 110%(I'm analistic<g>) water tight. The door design/construction exceeds that easily, so the rest is up to me. That's why I need to make sure the holes are dead nutz on the money...I'm not hacking anything this time.
That sounds like a good deal. Thanks for the details.
BTW, Makita has a simular tool to a Bulldog. Called a Pitbull. It's rated at 7/8" capacity so it's the same as the older model BullDog.
Home Depot has been running a special on them in some places where you get the PitBull , a 4 1/2 in. grinder and some bits and stuff. Not the bits you'll need but you might want to chaeck it out.
Seeme like it was right around $200 somewhere.
"It's always better to have regrets for things you've done than for things you wish you had done..........."
You forgot Metabo. They make great hammer drills and grinders. The model Metabo hammer drill I have was also made for Hilti awhile back.
short coming to that is Metabo isn't readily available or support for them as is Hilti and Bosch....
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!<!----><!---->
Forget the primal scream, just ROAR!!!
to quote somebody...
There's basically Hilti, Bosch and everything else. I'd say most of us would spring for a Hilti if we had the money to spare, but an equivalent Bosch hammer is about 40% cheaper and 99% as good.
look at the 7/8 instead...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!<!----><!---->
Forget the primal scream, just ROAR!!!
I've had a 7/8" Bosch SDS for years. What's the difference between that one and the 1" ---- size of bits it can take?********************************************************
"It is what we learn after we think we know it all, that counts."
John Wooden 1910-
I have the milwakee and there is nothing wrong with it, now we are talking hammer drill
rated hole dia..
I have the 7/8 too...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!<!----><!---->
Forget the primal scream, just ROAR!!!
the largest bit I have for the 7/8" SDS is 1".Will the 1" SDS take even bigger bits? The only time I have needed a bit bigger than 1" is a few times when I had to run some kind of pipe through masonry. Then I limped through the job with a carbide hole saw.********************************************************
"It is what we learn after we think we know it all, that counts."
John Wooden 1910-
after 1-1/8" you move into SDS MAX from SDS plus..."
the 1" bit taxes a 7/8... a 1-1/8" doesn't work well at all in a 7/8...
hence the 1" SDS and the 1-1/8" drill motors...
the 7/8 SDS is only an entry level tool...
the 7/8 I have is the discontinued model... old... Lowes cleared them out for the new generation models...
at 70$ a copy... bought all 11 that were available...
BTW... there is 3 levels of SDS.. then you go to spline..
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!<!----><!---->
Forget the primal scream, just ROAR!!!
If the 7/8" is an "entry level" tool -- it is one helll of a machine. In addition to drilling holes, I have just about beat it to death using it as a demo tool in bathroom remodels. Yeah, I know it's not made for that kind of abuse. But it's amazing (to me at least) how well it has stood up.********************************************************
"It is what we learn after we think we know it all, that counts."
John Wooden 1910-
the bulldog series speak for themselves...
they are some can do mothers...
now go get ya 1-9/16"........
holes out to 6"...
not enough.. go spline....
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!<!----><!---->
Forget the primal scream, just ROAR!!!
stupid Q maybe...
But why the need for a large chuck when I only need 5/16 holes?
Heavy hitter for accuracy?
it's not a chuck...
the bit is a modified splined shank - maybe 3/8 to 7/16" in dia...
bit dia's go from 5/32 to 1-1/8" for the SDS plus...
see the above post...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!<!----><!---->
Forget the primal scream, just ROAR!!!
Ahha...I see
said the deaf dumb & blind man ;)
the number is the size rating.. like horse power...
that modified spline locks into a reciever that is actually pretty small...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!<!----><!---->
Forget the primal scream, just ROAR!!!
Nikkiwood,The new Bulldog is similar to the old one, but rated a little higher. Same SDS chuck. You could put a 1" bit in a 7/8" Bulldog, but don't tell anyone about it.My own experience with SDS hammers pushing big bits is this: The impact stops being enough to fracture what's being drilled before the rotational force is too weak.Bill
short of Hilti..
it's the best damn ferroelectric electronic-photonic nanodevice you'll ever find...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!<!----><!---->
Forget the primal scream, just ROAR!!!
yeah I'll bet it is too...(sigh)
The more I look at that recon one, the more I want one. Just can't swing it right now.
Talked with my BIL and he has a Milwaukee 1 1/2" Eagle Rotary Hammer that he'll drop off, including a carbide bit. Don't know the brand of the bit, but he said that it should work. Or he'll get me a Bosch Bulldog if I need it. Can't beat that!
Providing I get a quality bit, the Milwaukee should work fine...right?
Milwaukee has good bits...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!<!----><!---->
Forget the primal scream, just ROAR!!!
http://www.amazon.com/Bosch-11255VSR-BULLDOG-SDS-plus-D-Handle/dp/B000BB79Q6/sr=8-1/qid=1158084912/ref=pd_bbs_1/102-0694165-8305746?ie=UTF8&s=hi
bobl Volo, non valeo
Baloney detecter WFR
u don't really need a drill like that for drilling some 5/16" holes...even a cordless hammer drill will do...my makita 18v lithium ion gets the job done day in day out...
I'm sure your drill does everything you need it to, but...
The first time around, I used a corded hammer drill for 3/8 holes and I couldn't get accurate hole placement. I'm not about to risk skrewing up this new door or installation, so I'll follow the advice from these guys. They've bailed my azz out for far more serious problems, so no reason to doubt them now.
Thanx anyways...
Don't bulldogs tend to be fairly small dogs? I gues they are so mean though because of having to go through life being so ugly :-) I'll put my money on the 120 lb rottweiler any day. :-) http://www.amazon.com/Hitachi-DH40MR-MAX-Rotary-Hammer/dp/B00009LI4B/sr=1-1/qid=1158146882/ref=sr_1_1/103-3117840-1064608?ie=UTF8&s=hi
BTW - for you others people who refered to a hammer drill, I have one of the best Milwalkees. I guess it has a little bite. Here is a pic of how I'd characterize it: http://www.dogbreedinfo.com/boshih.htm
so how do you get to call that toy poodle of a Hitatchie a 120 pound Rottie...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!<!----><!---->
Forget the primal scream, just ROAR!!!
Edited 9/13/2006 7:50 am by IMERC
Forgot to acknowledge someone from BT last night...not sure if he wants me to give his name?...
got an email last night from someone offering use of his Hilti TE-6. Man...that was a surprise! Pretty generous of someone to loan out a Hilti to a stranger. Maybe he lives around here? I recognize the name, just not sure if I've spojken with him.
Regardless, it just goes to show the type of folks that hang their hat at BT. Thanks again budView Image
just make sure you return that Hilti to me when yur done...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!<!----><!---->
Forget the primal scream, just ROAR!!!
you droppin it off tonight or do I have to come shag it?
stop in...
if I ain't here I'll be up on the South Platte...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!<!----><!---->
Forget the primal scream, just ROAR!!!
about nine'ish OK?
eightish if ya like trout and greens...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!<!----><!---->
Forget the primal scream, just ROAR!!!
uh...no pizza?
greens sound good, but we don't do trout...yack!
see ya after nine or so...I'm outta here
sorry about missing ya at nineish..
broke my heal.. not moving so fast...
BTW you don't happen to have a used turbo fo a 95 - 7 three..
it needs to do duty for a month or 3... so cheaper than cheap matters...
it will end up being disposable...
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming<!----><!----><!---->
WOW!!! What a Ride!<!----><!---->
Forget the primal scream, just ROAR!!!
no problem...I got lost trying to find you and ended up spending the night in woods. Damn it's cold in them mountains of yurs!! Any chance you can come look for me? and bring some chow too...I'm hunrgy
I'll ask around for a turbo...might just know of a 7.3 that popped. As long as it didn't inhale anything, it should still be good
busted heal...can we say ouch! I didn't know a 'tank' could break so easy<g>
You may already know this, but it'll go twice as fast if using a hammer drill. Your template idea sounds good.
PlaneWood by Mike_in_Katy (maker of fine sawdust!)
PlaneWood
No doubt about the hammer drill...I'd be drilling for days without it
Thanks anyways
you can rent those drills at hertz rentals and it will drill a 6 inch deep 5/16 hole in the hardest thickest strongest concrete in less than 30 seconds... you need sds rotary hammer...not hammer.
The holes might be done already....but I had 2 thoughts:
Rent a core bore maching that you tapcon to the wall, the drill rides on a carrige and the hole goes right where you want 'em.
OR...
Drill a big azz hole instead and of your 5/16, which will give you some slop to play around with. Then epoxy the fasterners in there, and you can line them up fast, right where you need them to be.
Ithaca, NY "10 square miles, surrounded by reality"
No holes yet, plan to do it on Sat if it doesn't rain.
Coin is tight right now due to a recent big $$$ tool purchase, so renting the core bore deal is not really something I want to do. BUT...that epoxy tip is GREAT! Definately a back up plan in case I fudge up a hole or 3.
Thanx for the tip Stray...you get my vote for a top 3 answerView Image
Edited 9/14/2006 8:36 pm ET by caveman