I have an old terrazzo stone staircase and need to screw in a handrail. Which drill bit should be used? It's really hard, but I don't want to cause any cracks either.
Maybe something like this? https://www.hornbach.se/shop/ALPEN-Granit-och-stenborr-PROFI-4x75-mm/8659821/artikel-detaljer.html
Or do I need to use a diamond drill bit?
Will water cooling be necessary regardless of the drill bit used?
A completely different question, by the way, I need to fill the holes from the old handrail, which filler will be most invisible on black/grey terrazzo?
Maybe something like this? https://www.hornbach.se/shop/ALPEN-Granit-och-stenborr-PROFI-4x75-mm/8659821/artikel-detaljer.html
Or do I need to use a diamond drill bit?
Will water cooling be necessary regardless of the drill bit used?
A completely different question, by the way, I need to fill the holes from the old handrail, which filler will be most invisible on black/grey terrazzo?
The terrazzo stairs from Norberg are concrete, and the aggregate is sanded, often stone from hard rock types.
You don't need a coromant drill bit, but it makes the job easier.
If you have a stand for the drill, I recommend using it, as the hole will be easier/not as difficult to get reasonably good.
To know which shade you should have for the old hole, information about the aggregate in your stairs is needed.
Best regards, P-A
You don't need a coromant drill bit, but it makes the job easier.
If you have a stand for the drill, I recommend using it, as the hole will be easier/not as difficult to get reasonably good.
To know which shade you should have for the old hole, information about the aggregate in your stairs is needed.
Best regards, P-A
Koromant drill bit is what is called a diamond drill, I suppose? Unfortunately, I don't know anything about the staircase other than what I see on the surface. So I'll have to carefully try with a small masonry drill and see how it goes. No water cooling needed?
Unfortunately, I don't have a stand. Is it possible to buy one as an accessory for a cordless drill for a reasonable price?
Unfortunately, I don't have a stand. Is it possible to buy one as an accessory for a cordless drill for a reasonable price?
richardtenggren
Ingen-gör
· Norrlandet
· 6 615 posts
richardtenggren
Ingen-gör
- Norrlandet
- 6,615 posts
I guess that koromant comes from Sandvik Coromant, which previously included drill bits/solid carbide drills. You could say that coromant was a pioneer in carbide. But today, Coromant does not deal with rock drilling, it has been sold under Sandvik Mining for many years. However, a good brand can become synonymous with a product; it is said that they launched the first carbide-tipped solid drill in 1942, though there is some uncertainty there.
For most purposes, a drill bit with carbide inserts works fine, buying diamond-coated drill bits is expensive, very expensive, and 28 mm is the smallest that Sandvik sells (there are smaller plug hole drills), but I believe they have never sold these sizes with diamond. Diamond is usually chosen due to lifespan requirements.
So, buy a good quality concrete drill, and it will have reasonably good carbide, maybe not at Sandvik's level but decent
I like Dewalt's 4-cutters.
For most purposes, a drill bit with carbide inserts works fine, buying diamond-coated drill bits is expensive, very expensive, and 28 mm is the smallest that Sandvik sells (there are smaller plug hole drills), but I believe they have never sold these sizes with diamond. Diamond is usually chosen due to lifespan requirements.
So, buy a good quality concrete drill, and it will have reasonably good carbide, maybe not at Sandvik's level but decent
I like Dewalt's 4-cutters.