It's all very well starting from the garage side to stop dust in the house, but if you don't finish it from the house side, there's a good chance of knocking off the plaster, even though not on hammer.

Over here in the US our employers supply the tools to do the job. Because they're obsessed with getting the job done fast, they give us the same type of diamond coring bit but it's powered straight off of a full size angle grinder with no pilot bit attachment and no safety clutch, needless to say that starting a 5 inch hole takes practice. I like your method much better, it looks a whole lot safer, more accurate, and I believe the coring bit last much longer if ran at a lower speed. Good vid!

A very comprehensive guide with a lot of useful tips. I hope my 9" brick wall takes a hole as neatly as yours did. Many thanks for posting.

I'd add earplugs to protect your hearing (we want to hear our grandkids when we're old, right?) and spraying water to keep down the cancerous silica dust and keeping the bit cooler for greater bit lifespan. Or at least a dust mask rated for silica dust, worn correctly.

thanks for this video, lots of us handymen learning from one another really helps a lot. for the long years ive been working, i still miss a lot , and your videos patch that missing info. regards

Thanks UHM! my dad was trying to bore through a chimney without a pilot bit, its a good thing we hadn't wallpapered yet :P

This video was really helpful and gave me the confidence to drill through a double layered wall and then fit a vent pipe. It saved me £170 on a quote I had from a builder. As stated on the video use a clutched drill, the clutch came into action on mine as the bit stuck in the wall. I think it would have been "nasty" had I just used my ordinary B & D.

Great vid thanks. Came in to see how it should be done after nearly breaking my wrist when the drill I was using to cut a core jammed. I can personally vouch for the part where you say a clutch in the drill is important.

I love your videos as a young Worker its always good to see experienced !!!

Thanks for that, I'll give it a go. Very helpful video's by the way! after lots of hit and miss with finding studs using a 'detector', I stumbled on your video about neodymium magnets then got some off ebay and since then this site is my first port of call for tips! Great advice, cheers.

All great advice. Drilling all the way through the wall is only needed if you need to locate the centre of cut on the other side. Also when starting it is good to get through any plaster layer and into about half an inch of brick before removing the pilot bit, the diamond cutter can wander and create a lot of break out if not into the brick. A good clutch is essential as it stops the drill whipping around if the cutter gets jammed mid cut.

Thanks a lot mate, We drill a lot of holes for flues and some walls are an absolute nightmare to core! Big chunky sds drills are the worst idea ever when used for coring! Since I used a dedicated core drill once a while back, I absolutely want one, Smoothest core ever, That wall happened to be an easy wall to core anyway but still was very relaxing to do it haha

Very helpful, thank you. I will be using you advice soon, when I drill a hole for my central heating air vent.

Top vid as usual. Clear. Never usually have any further q's once you've explained something

The envelope trick, that was sneaky mate ! love it :)

Nice advice on safety and keeping the job clean that's professional. When I drill any type of hole , being a plumber by trade , I look at everything around me as well and plan for anything that could hit me or interfere when/if the drill catches and the clutch might take a second to kick in you still dont want your knuckles or fingers broken from a good kick-back.

Brilliant - thanks. The local boys working for me here will be amazed. Still cutting massive holes in block work with a chisel and hammer to put a pipe through the wall!!

That was really helpful did not know about the requirement for the chuck.

Impressive instruction. I must say the quality of the material/construction seen in this video appears superior to what we see here in the states.

I am not a tradesman but i enjoy watching these vidoes. Sometimes I wonder if I should try things by myself during my day off.

Every time i watch this video the huffing trying to get the crap out of the core bill always makes me smile. Nothing worse can getting something stuck in there and not wanting to smash or tap the bit to get it out.

Using an envelop to collect the dust is very clever. Thank you for the helpful video sir.

Excellent demo 👍 I would however suggest that it would be better to orientate the drill handle so that you're holding it above the drill body. That way if the drill binds and it starts to turn anticlockwise (even if you have a clutch it's not instantaneous and they do fail) you have a hand there to brace it, hopefully saving your trigger hand. (If the drill binds with your hand in the location shown in the video it will just pull it out of your grip and you'll lose control of it). It's a useful habit to get into when drilling.

Envelope trick is brilliant. Also, I've seen Shop-Vac secured near to suck up concrete dust, as well as another person "wetting" the area with a fine spray mist.

You made this look so much better and easier than a video by Moorcut. Thanks, super cool.

great demonstration

I've been using the core drills that require the rotary hammer function to work - this looks like a much cleaner QUIETER way of doing things. Thanks!

برنامج مفيد جدا شكرا very useful show ,,, thank you

your video are great man. thank you. keep uploading please

Very useful video. Like the envelope on the wall, I normally get the hoover out and hold it awkwardly under the drill.

Excellent video, thanks

You're a great teacher - Thanks, I learnt a lot.

Thanks for this video mate, very helpful . Got six of these to do 😎

yup I just did a core above ceiling grid, 2-1/2" hole...thru brick. Took me about 10 secs of drillin and I bolt to the truck, got my gloves, my mask, my safety glasses and ear plugs. My mask was completely red when I got thru....I was surprised that the vibration went down a little when i put on my gloves. And the ringing in my ears not as bad as when I didn't have plugs on. Learn my lesson that day.

Great video. Just bought a core drill myself and I'm sure I would have left the guide drill in the whole way if it wasn't for your advice. It makes perfect sense to take it out, since the diamond core is acting as the guide. One thing though, it seems my guide bit isn't quite true - could it have come that way from the factory or is it an optical illusion, and does it matter? It's a Bosch core drill kit bought brand new, so I wonder if they're all like that.

@Dean Mckeown The one in the video I think was Silverline. I have since purchased a Makita set which was only a few quid more expensive than the Silverline.

شغل ممتاز مع فني محترف ومع معدات شركة بوش ... احسنت

Another great tutorial. Thanks.

@Fire System Security No, a safety clutch stops the machine from turning if the bit gets jammed ;-)

I never took the pilot bit out. Thanks for the advice

If ever needed to enlarge a core drilled hole drive some wood into the existing hole and wood drill a hole in the middle. The pilot will follow it easy for the larger hole without fingers going missing.

well explained. just what i needed to understand how to use these drills

I have a 100mm duct in a bedroom. I need to install a heat recovery unit to remove high humidity from the room. The unit only comes as 150mm, you mentioned that expanding a core size is a pain, any ideas on how to approach this? Its a hollow block wall, would I be easier chiselling it out with an impact hammer?

Used the exact same size today on the job for the first ever, through two walls.

nice video. can you use water on the bit to reduce dust?

Pilot bit, I learned new. Thank you.

thank you man , useful advices !!!

that's what I'm planning to do when going from a 4" hole to 6" for an extractor fan. Was planning on cutting a 4" circle out of a block of wood, though. I'm with you on the PPE. Don't know what the crazy guy is talking about damaging your hands by wearing gloves.

I actually found that the core drill jamed a lot more when i removed pilot drill, ive done it both ways. So now i leave it in.

I always go through the inside plaster just a few cm to stop it cracking. Can almost guarantee if you go straight through from one side the hole will not be a clean neat cut. A helper with a Hoover works well inside too to keep dust to a minimum

Thanks, good vid, covered all the points I wasn't sure about

master job,,,,looking very nice

This gives me enough confidence to do this myself instead of paying someone.

Great learning curve, Thanks !!

Great video, everything was well explained. If drilling through a very thick wall (12"), is there a way to break the core mid-way through the the hole and remove it so there is room to continue drilling?

I have a Bosch - 11241EVS drill but it doesnt have only drilling option. It works either hammer or hammer drill so can I use diamond 3' with hammer and drill option together. Will it be stable at first???

wow i finally get to see the simplier demo and therefor it is more understabe to me thankyou sir

i got to drill through 2 steel reinforced concrete beams above an old doorway and it tool over 2 hours of drilling to get through the outer one and now i got to do the inner one..... the corners are beginning to wear ont slightly on the core bit now :( any advise or just keep going? the steel bars are about the size of your index finger and i have managed to get through 2 of them in the first beam.

After drilling a whole in a wall like that..is the core drill still as sharp or as effective?

Hello, i need to drill through some porcelain tile on my kitchen wall, i have used masonry bits and its doesnt seem to work, i wanted to get a diamond bit but i cant find any in 11/64s, please help

"I am wearing safety gloves and glasses." I'm more anticipating my hearing before it even began :D

What rpm do you use, (ie cutting speed). Constant, or what just feels best?

I’m moving my toilet just now and need to relocate the soil pipe which I need to drill through my external wall, the drill I’m hiring for the day is 127mm do you think that will be an ok size? Great video, gave me great advice and always helps seeing it actually done when your a novice, explained it really well.

Great videos, I love the intro. There may come a time when you need to drill a big hole in a wall. No messin about

I have an rayburn with a 5 inch flue pipe but if I replace it there will be an 150mm flue.From what you say the core drill will not easily enlarge the hole, any ideas

what the price for one of those diamond core and can that cutting piece be use only that model bosch

Muito bom Parabéns felicidades mais um Escrito

will this type of drill bit drill through a 6" REINFORCED solid concrete wall? Thanks in advance

Nice Demo. My video little similar to this about making chimney hole nicely.

Amazing video

excellent vid thanks

Great Video. I need to drill a venting hole in my house for the kitchen extractor. The old ducting is just shitty PVC flexible ducting (with some holes in it). Impossible to change to something better unless plasterboard is pulled down. So I have to go the other way and drill a hole in the wall. I have a Bosch GBH2000 drill that is 620W and has a safety clutch. Would that be enough to go through the wall? Or I need a more powerful drill 1500W? The wall is a cavity wall concrete blocks and brick on the outer layer. The house has a 86mm internal insulation as well. Thx

hi nice what is the maximum core bit i can use with 2-28dv

Can you use normal sds drill? or does it have to be diamond core drill?

I agree with the Ultimate handyman

It is worth hitting the end of the taper drill to seat it in the taper, otherwise it can come out when drilling. Also, for large diamond cores, it's better to use the hex Arbor, as the SdS one is more liable to snap. As your Bosch multi drill has two trucks, use the large hex/ standard chuck

I score through the plaster on the inside, saves a massive blowout when you breakthrough. Little bit of dust, no huge chunks of plaster coming off.

Wow, over 1 million views for this video! Thanks to anyone that has ever watched it ;-)

thats a good idea, its probably a lot less messing about than other methods. thanks

Very helpful video but I have a question though. I have a set of diamond core drills which came with a SDS plus and hex adaptor and 2 cores with a diameters of 117mm and 127mm (amongst other cores with smaller diameters). Guidelines of the manufacturer are not to use diamond cores larger than 72mm in diameter with SDS plus drills as this may result in damage to the tool or the adaptor (because of over the overload on the shank). Hence why they provide the hex adaptor with it so that larger diameter cores can be used on drills with standard keyed or keyless locking chuck that can accept large diameter cores. But that makes those cores kinda useless for me using a SDS plus machine. Since I see you use a core of about 117 mm on an SDS plus, what's your experience on that statement? I'd just need it to drill the occasional hole.

ok thanks for your video and advice

I Learn a lot, thank you.

where i can find this adapter , frome hammer drill to core drill

Good video on the correct procedure for dry diamond coring. However, SDS machines are really not that suitable for this application. They might be big and powerful, but they do not rev fast enough for the diamond segments to work properly. A dedicated dry diamond core machine will rev between a variable 700 & 2500rpm and will have a slipping clutch.

10 inch hole you use a core drill hooked up to water you usually have to anchor the core drill to the floor or wall with threaded rod/drop in anchors and go slow

Solid walls are easy! Brick cavity construction is more difficult as when the core-drill crosses the cavity it may try to jam. Make sure that the fuse in the mains plug is only two or three amp. If perchance a 13 amp fuse is left in the plug, one may have a problem (stripped gears, broken wrist or arm, being tipped off the ladder etc) In actual fact SDS arbors which are really just DIY devices will probably shear off first. A quite difficult job is drilling vertical holes in Devon-Banks and Cornish Hedges. (Allegedly there are slight variations in construction) Both tend to be made from quarry waste bound together with clay. It is difficult to get plants to grow in such poor soil so holes need to be drilled and usually earth-augers won't work. Something that can tackle clay, stone and tree roots is needed. Continuous wet-diamond might be the best but such drills are hard to find.

Maybe you could cut a 150 mm hole in some ply with a jigsaw and the plug and screw that over the existing smaller hole. this may provide the support needed for the core drill without it slipping when starting the larger hole.

Could you use this to drill through the wall of a safety deposit box building?

Great video but what did you mean by a drift when removing the drill bit to prevent the core drill from jamming. Thanks for replying to my questions.

Can diamond core drill can core stones,granite,etc... ?

thanks fella i'll give that a go, i have still not done it as i borrowed a drill to do it and my mate needed it back + i just could not bring myself to do another 2hrs+ of drilling up a ladder lol

My Hero!

Thanks a awesome channel. you should do a video on how to install a split ac unit in uk. all the other vid are American.

great video but still can't find out what size diamond core drill bit I need for a 40mm hole for waste pipe, is there a chart anywhwere that I can look up. Thanks for all your videos, I'm a late comer to your channel so don't expect many answers so I'll keep looking, I asked a couple of plumbers but they didn't seem to want to give out any info.

I’m in the UK too, where do you buy this stuff? I need to punch a hole for the drier exhaust, multiple layer wall (including insulation and air space) that I would have to seal before I insert the tube, any tips on how to seal the layers? Thank you!

Ha. Love the envelope trick! Cheers.

Was really hoping to see the coring of the 2nd side of the cinder blocks. what exactly happens when it binds and you don't have a clutch? Dislocated shoulder?

Hello, Great video give me confidence to do a job I've been reluctant to start.I bought 127 mm diamond core drill today for drilling a hole for soil pipe in wall, I got 2 questions,is it better to have this size 127mm rather than an exact fit of 110mm(soil pipe is 110 mm)and my main question my drill is useless so im looking for a capable drill are their any particular specs (ie volts,watt or simply a name)i should look for when buying as my eye is on about 5 drills Im not loaded so im looking for a good but powerful drill able for this job any tips i would be very grateful cheers

I would recommend keeping the drill bit in place when using the core drill, otherwise the core drill wanders and can result in the hole being way out of line (especially on thick walls).

lol i had a makita, but it still works :D (although it makes a grinding noise when going counter clockwise)