Wanted: Core Drill bit 110 mm diameter

[Geoff.D]

Item: Core drill bit 110 mm diameter
Packaging: not essential
Age and Condition: Any age any condition
Location: Pretoria East
Shipping: Will accept.

Looking for used/damaged worn out core drill bit used for cutting a 110 mm hole

 

[APoc184]

For wood or concrete?

I might be able to help with a diamond tipped core barrel used for drilling into reinforced concrete.

Similar to these.

 

[Geoff.D]

For wood or concrete?

I might be able to help with a diamond tipped core barrel used for drilling into reinforced concrete.

Similar to these.

View attachment 1045999

Yes for masonry brick cutting. As per the pic. I am planning to make a handheld tool out of the barrel, able to undertake small jobs with a low powered drill or even manual rotation.

 

[APoc184]

Mmmm...

I'll check for you if we have a finished barrel on Saturday when I'm back at the shop.

Problem is the barrel will not have any diamond tips left as we drill them until all segments are completely finished.

So will only be the steel barrel with the threaded 25mm connection. So will also not work on standard drills unless you can convert it somehow.

Maybe you should come and have a look to see if it'll work for you.

 

[Geoff.D]

Mmmm...

I'll check for you if we have a finished barrel on Saturday when I'm back at the shop.

Problem is the barrel will not have any diamond tips left as we drill them until all segments are completely finished.

So will only be the steel barrel with the threaded 25mm connection. So will also not work on standard drills unless you can convert it somehow.

Maybe you should come and have a look to see if it'll work for you.

Thanks, lets talk past the weekend. I am not surprised, given the cost of these things. We used to do the same, use the bit until it is just a pipe. On brick it really does not matter if the diamond tips are not there anymore.

There are many places and applications where no one can get to with a full core drill rig at that sort of diameter. If one then goes the "normal contractor" route, they send in a labourer with a hammer and chisel or simply suggest that you change your plans. I refuse to go both routes hence why I want to come up with my own tool.
I have already worked out an adaptor for a normal drill --- the adaptor works but I have never used it on a 110 mm dia yet, that is going to be a new one. Hence why the other option will good old arm power and patience.

 

[RonSwanson]

Item: Core drill bit 110 mm diameter
Packaging: not essential
Age and Condition: Any age any condition
Location: Pretoria East
Shipping: Will accept.

Looking for used/damaged worn out core drill bit used for cutting a 110 mm hole

Putting in a coalstove?

 

[Geoff.D]

Putting in a coalstove?

Heh heh. Someone has to take on the task of keeping the AGW hype alive.
No, helping my daughter with a bathroom make over.

 

[APoc184]

So this is what I have for you. This barrel will be finished in about 2 or 3 holes of concrete drilling. Still has like 0.5mm of diamond tips remaining. We have a new barrel being used already so not using this anymore.

 

[RonSwanson]

Heh heh. Someone has to take on the task of keeping the AGW hype alive.
No, helping my daughter with a bathroom make over.

OK, I was thinking of this, many of them have 110mm diameter chimneys.

 

[ArmatageShanks]

So this is what I have for you. This barrel will be finished in about 2 or 3 holes of concrete drilling. Still has like 0.5mm of diamond tips remaining. We have a new barrel being used already so not using this anymore.

View attachment 1046425

At the previous company they used these to make 90 & 102mm holes for testing equipment underground, they wouldn't last more than 5 holes unless you cut very slowly and cooled it.

So instead of worrying about the cost of replacing them every month we got the stores operators to bag every spent carbide parting insert from the floor, a few of these were then brazed to notches in thin wall tubing and given to a appie to grind down the OD only, other end got a piece of round bar welded across with a bit of 1/4 key steel.

Fitted to masonry drill, hammer on plus water through the back of the tube. They didn't last that much longer but you could use hammer and they were basically free.

Should work 10x better on concrete.

 

[APoc184]

At the previous company they used these to make 90 & 102mm holes for testing equipment underground, they wouldn't last more than 5 holes unless you cut very slowly and cooled it.

So instead of worrying about the cost of replacing them every month we got the stores operators to bag every spent carbide parting insert from the floor, a few of these were then brazed to notches in thin wall tubing and given to a appie to grind down the OD only, other end got a piece of round bar welded across with a bit of 1/4 key steel.

Fitted to masonry drill, hammer on plus water through the back of the tube. They didn't last that much longer but you could use hammer and they were basically free.

Should work 10x better on concrete.

We mainly do core drilling for construction sites. So mainly for 50mm, 75mm, 110mm and 160mm pipes. We do go as big as 300mm.

And yes. Slow and steady is very important. And especially need to keep the barrel wet and cool at all times.
In masonry we can drill with a handheld machine. But as soon as you go reinforced concrete we use a mounted drill running on a rail.

We had a company that re-tipped our barrels at one stage but the walls of the barrel would wear through before we finished the tips again. So now we just buy new barrels every time.

Pretty impressive what type of steel these things can go through with little to no effort. Just patience.

 

[ArmatageShanks]

We mainly do core drilling for construction sites. So mainly for 50mm, 75mm, 110mm and 160mm pipes. We do go as big as 300mm.

And yes. Slow and steady is very important. And especially need to keep the barrel wet and cool at all times.
In masonry we can drill with a handheld machine. But as soon as you go reinforced concrete we use a mounted drill running on a rail.

We had a company that re-tipped our barrels at one stage but the walls of the barrel would wear through before we finished the tips again. So now we just buy new barrels every time.

Pretty impressive what type of steel these things can go through with little to no effort. Just patience.

That's the thing yeah, have you seen the diamond studded (or is it impregnated?) cables they use on slabs of stone and concrete?
Impressive sight.

 

[Geoff.D]

So this is what I have for you. This barrel will be finished in about 2 or 3 holes of concrete drilling. Still has like 0.5mm of diamond tips remaining. We have a new barrel being used already so not using this anymore.

View attachment 1046425

Perfect thank you. That will work for what I want to do.
See my pm message.

 

[Geoff.D]

We mainly do core drilling for construction sites. So mainly for 50mm, 75mm, 110mm and 160mm pipes. We do go as big as 300mm.

And yes. Slow and steady is very important. And especially need to keep the barrel wet and cool at all times.
In masonry we can drill with a handheld machine. But as soon as you go reinforced concrete we use a mounted drill running on a rail.

We had a company that re-tipped our barrels at one stage but the walls of the barrel would wear through before we finished the tips again. So now we just buy new barrels every time.

Pretty impressive what type of steel these things can go through with little to no effort. Just patience.

View attachment 1046439

Not sure how anyone is able to core drill above 60 mm dia with a hand held machine?
What makes of machine do you use?
I presume you also have a few Gorillas in your employment to be able to hold and control the machines when hand coring?

 

[APoc184]

Not sure how anyone is able to core drill above 60 mm dia with a hand held machine?
What makes of machine do you use?
I presume you also have a few Gorillas in your employment to be able to hold and control the machines when hand coring?

Lolz. We've done 160mm handheld on a few occasions. The walls were simply too brittle and the anchors on the drill mount would keep on pulling out or breaking loose.

110mm handheld is actually like 75% of our orders. Mainly for bathroom renovations and water drainage on boundary walls.

We use Husqvarna and Hilti core drills. The handhelds have slip clutches built in. So should the barrel get stuck it doesn't break the driller's arm.

The mounted drills... Well, if it is mounted correctly there is almost nothing that will make it get stuck. And the Hilti machines are so clever. You simply cannot apply to much force. The machines protects itself and simply switches off when the driller tries going to quickly. 3 stages of warning lights before that happens.

 

[Geoff.D]

All masonry and concrete drilling should be low power and as slow as possible. Then dry drilling in brick work is also possible barring for the dust problem.

 

[APoc184]

We do 110mm weeping holes for these type of retaining walls on a daily basis. Mostly up on the hills in Waterkloof. Turn it 90degrees to get a better idea.
Those are almost 450mm drilling depth.

 

[Geoff.D]

Are the Husqvarna machines more suited for hand drilling?
I presume you also specialise in wall chasing for pipes?

 

[APoc184]

Are the Husqvarna machines more suited for hand drilling?
I presume you also specialise in wall chasing for pipes?

Both Husqvarna and Hilti have handheld and mounted drills. From our 15yrs of drilling, they are pretty much on par with each other. Hilti is just 3 times the price.
When the Hilti dies we won't go that route again.

Our barrel supplier recently brought in their own brand of handheld cores and we gave it a try. But it is nowhere near as good as the Husq or the Hilti. But yeah. it is also a fraction of the cost of the others. So we are giving it a go and see how long it'll last.

We only do the core drilling. Chasing we leave for the plumbers or electricians.

 

[Geoff.D]

Both Husqvarna and Hilti have handheld and mounted drills. From our 15yrs of drilling, they are pretty much on par with each other. Hilti is just 3 times the price.
When the Hilti dies we won't go that route again.

Our barrel supplier recently brought in their own brand of handheld cores and we gave it a try. But it is nowhere near as good as the Husq or the Hilti. But yeah. it is also a fraction of the cost of the others. So we are giving it a go and see how long it'll last.

We only do the core drilling. Chasing we leave for the plumbers or electricians.

Or the amateurs. My daughter and I used a hilti wall chaser on her job. Works great. The problem is the condition of the hired machines one gets. It took me 2 hours to service and FIX the one we hired before we could even start the job.
The hiring shops just don't bother to service their machines properly.
The biggest problem we have encountered is the brick quality. They are either over baked "klinkers" or sand held together with some spit.