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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Drilling holes in slate and granite
What kind of drill bit do I need for a) slate and b) granite? (I have a
small drill press) How do I proceed - one hole, or several - drilling out gradually to increase the diameter of the hole? I need to drill out a hole of about 8mm. Any difficulties I should forsee, like slate splitting? Do I need water cooling? Depth of slate would be either 10mm or 20mm. Is this fairly fast or very slow and laborious? How is granite compared to slate? Thanks - never drilled into these materials before. Andy |
#2
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Drilling holes in slate and granite
Grunff wrote:
Eusebius wrote: What kind of drill bit do I need for a) slate and b) granite? (I have a small drill press) How do I proceed - one hole, or several - drilling out gradually to increase the diameter of the hole? I need to drill out a hole of about 8mm. Any difficulties I should forsee, like slate splitting? Do I need water cooling? Depth of slate would be either 10mm or 20mm. Is this fairly fast or very slow and laborious? How is granite compared to slate? Thanks - never drilled into these materials before. Andy Slate is easy and very forgiving - just use a masonry bit. I wouldn't. an 8mm HSS would be more suitable or even an old wood bit. |
#3
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Drilling holes in slate and granite
Eusebius wrote:
What kind of drill bit do I need for a) slate and b) granite? (I have a small drill press) How do I proceed - one hole, or several - drilling out gradually to increase the diameter of the hole? I need to drill out a hole of about 8mm. Any difficulties I should forsee, like slate splitting? Do I need water cooling? Depth of slate would be either 10mm or 20mm. Is this fairly fast or very slow and laborious? How is granite compared to slate? Thanks - never drilled into these materials before. Andy Slate is easy and very forgiving - just use a masonry bit. You won't need cooling. A pilot hole will make it easier to get the hole exactly where you want it, but is unnecessary if you can clamp the workpiece. It should only take you a couple of minutes. Granite is much, much, much harder. I'd use a masonry SDS (assuming the same depth and hole size), starting with a 4mm and working up to an 8mm. But you need to support the granite very well to avoid breaking it. -- Grunff |
#4
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Drilling holes in slate and granite
But you need to support the granite very well to avoid breaking it.
In terms of splitting, is granite better or worse than slate? I'm considering using one or other for a face plate for a diy hi-fi amplifier. If there's a risk of splitting, I presume I need to use an aluminium plate behind it for structural reasons, and glue the slate to the alu (???what glue). Prefer to avoid it - what do you suggest? |
#5
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Drilling holes in slate and granite
Eusebius wrote: What kind of drill bit do I need for a) slate and b) granite? (I have a small drill press) They're chalk and cheese. Slate will make holes if you stare at it hard. Your problem is to avoid it splitting. Granite is really hard work and you need just the right tools. Slate is also highly variable - Lakeland slate is almost like granite, South Wales slates is flakey junk and a nightmare, North Wales slate is somewhere in between -- prone to splitting, but reasonably hard and stable. For slate I'd suggest non-hammer drilling with an abrasive drill bit for large holes, or a simple glass drill carbide leaf bit for small holes. Any drill should cope, even hand drills, but watch out for wobble causing splitting. Slate should be supported underneath with soft scrap wood or heavy corrugated cardboard over wood if uneven For a small number of 8mm holes in softer slate, I'd use a sacrifical twist drill and expect heavy wear on it. One of the brad-point wood drill bits with twist flutes but outside spurs as well, ideally TiN coated, will drill slate well and gives a good edge. Use your drill press for rigidity (those brad points are hard to start by hand, until the points sink). You can drill it with normal metalworking twist drills too, but expect heavy wear. If you use a masonry drill and non-hammer action, then sharpen it first. Most masonry drills are sharpened with impact chisel edges, not cutting edges. For slate it will matter. Granite can be drilled with an SDS masonry drill and hammer action, more slowly with a non-SDS hammer drill, or non-hammer with a diamond core drill for large holes. So you probably can't use your bench drill for any of these. Diamond drilling of granite may need coolants, extra slow speed, or high torque (with a safety clutch). Ask the drill bit maker. You can also chain drill granite, then break out between holes with a chisel. This is for 1 1/2" and upwards though, not small holes. For 8mm holes in granite, then I'd use a standard masonry bit and SDS. There'll be chipping around the edge though, maybe 15mm affected radius. If you _must_ have a smooth hole, go with wet diamond. Try to drill from both sides, as you'll see even more chipping on the exit hole. Wet coolants need to be generous, or else they just make a sticky paste that grabs onto the drill. I probably wouldn't bother, except for diamond in granite, production in slate, or if your diamond drill maker recommended it. |
#6
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Drilling holes in slate and granite
On 6 Sep 2006 05:13:02 -0700, "Eusebius"
wrote: But you need to support the granite very well to avoid breaking it. In terms of splitting, is granite better or worse than slate? I'm considering using one or other for a face plate for a diy hi-fi amplifier. If there's a risk of splitting, I presume I need to use an aluminium plate behind it for structural reasons, and glue the slate to the alu (???what glue). Prefer to avoid it - what do you suggest? Ebonite's rather nice for front panels. -- Frank Erskine Sunderland |
#7
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Drilling holes in slate and granite
Eusebius wrote:
But you need to support the granite very well to avoid breaking it. In terms of splitting, is granite better or worse than slate? They are totally different and break in different ways. Slate delaminates, splitting along the layers. Granite just breaks. I'm considering using one or other for a face plate for a diy hi-fi amplifier. If there's a risk of splitting, I presume I need to use an aluminium plate behind it for structural reasons, and glue the slate to the alu (???what glue). Prefer to avoid it - what do you suggest? Presumably your 8mm holes are for mounting pots, switches, indicators etc? Which means you'll need a few of them? I would use slate, without a doubt. It'll be much less work. No need for a backing plate. -- Grunff |
#8
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Drilling holes in slate and granite
The message . com
from "Eusebius" contains these words: Do I need water cooling? Depth of slate would be either 10mm or 20mm. Is this fairly fast or very slow and laborious? Slate's dead easy. Use plenty of water or you'll end up with dry clayey mud gluing the whole thing up. No hammer, unless you want to end up with it all in bits. -- Skipweasel Pay no attention to that man behind the curtain. |
#9
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Drilling holes in slate and granite
Frank Erskine wrote:
On 6 Sep 2006 05:13:02 -0700, "Eusebius" wrote: But you need to support the granite very well to avoid breaking it. In terms of splitting, is granite better or worse than slate? I'm considering using one or other for a face plate for a diy hi-fi amplifier. If there's a risk of splitting, I presume I need to use an aluminium plate behind it for structural reasons, and glue the slate to the alu (???what glue). Prefer to avoid it - what do you suggest? Ebonite's rather nice for front panels. surely thats been unobtainium for a long time. Does anyone still make it? Also I'd think slate or granite much nicer. Marble can be pretty too, though its weak stuff. NT |
#10
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Drilling holes in slate and granite
Eusebius wrote: What kind of drill bit do I need for a) slate and b) granite? (I have a small drill press) How do I proceed - one hole, or several - drilling out gradually to increase the diameter of the hole? I need to drill out a hole of about 8mm. Any difficulties I should forsee, like slate splitting? Do I need water cooling? Depth of slate would be either 10mm or 20mm. Is this fairly fast or very slow and laborious? How is granite compared to slate? Thanks - never drilled into these materials before. Andy Try your local plumber's or tiling or kitchen/bathroom retailer/merchant. I had to drill through porcelain and granite tiles on my last job and the 'spade' shaped bits were useless. I ended buying a diamond crusted bit which worked beautifully... no stressing or straining... no burning or 'glowing' of the bit or material. have a look here... http://www.toolshopdirect.co.uk/shopscr3098.html HTH, deano. |
#11
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Drilling holes in slate and granite
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#12
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Drilling holes in slate and granite
The message
from Frank Erskine contains these words: I mean, slate's for roofing, and granite for tombstones. Commonwealth war graves in France have slate headstones from the Wynncilate quarry. Saw pallet loads of them last time I was there 'cos a bunch of French oiks had smashed up a load of Tommies' resting places. -- Skipweasel Pay no attention to that man behind the curtain. |
#13
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Drilling holes in slate and granite
On Thu, 07 Sep 2006 00:06:14 +0100, Frank Erskine wrote:
I mean, slate's for roofing, Slate comes in many grades, roofing slate is very soft and splits cleaning and easyly (thats how they make 'em). Some slates are very dense, hard and don't split. We have some 3cm think lumps of Cumbrian Green Slate for the hearth, tough as old boots. and granite for tombstones. And building and worktops, though I can't see why people want granite worktops unless you are a pastry chef. -- Cheers Dave. pam is missing e-mail |
#14
Posted to uk.d-i-y
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Drilling holes in slate and granite
Grunff wrote:
Eusebius wrote: What kind of drill bit do I need for a) slate and b) granite? (I have a small drill press) How do I proceed - one hole, or several - drilling out gradually to increase the diameter of the hole? I need to drill out a hole of about 8mm. Any difficulties I should forsee, like slate splitting? Do I need water cooling? Depth of slate would be either 10mm or 20mm. Is this fairly fast or very slow and laborious? How is granite compared to slate? Thanks - never drilled into these materials before. Andy Slate is easy and very forgiving - just use a masonry bit. You won't need cooling. A pilot hole will make it easier to get the hole exactly where you want it, but is unnecessary if you can clamp the workpiece. It should only take you a couple of minutes. Granite is much, much, much harder. I'd use a masonry SDS (assuming the same depth and hole size), starting with a 4mm and working up to an 8mm. But you need to support the granite very well to avoid breaking it. I found a drill that is a diamond tipped core drill for drilling ceramic tiles and stones..I may be using it tomorrow in anger..but diamond is about all that will touch granite. |
#15
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Drilling holes in slate and granite
Eusebius wrote:
But you need to support the granite very well to avoid breaking it. In terms of splitting, is granite better or worse than slate? I'm considering using one or other for a face plate for a diy hi-fi amplifier. If there's a risk of splitting, I presume I need to use an aluminium plate behind it for structural reasons, and glue the slate to the alu (???what glue). Prefer to avoid it - what do you suggest? Granite is dead tough..it make break out a little at the back tho. a |
#16
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Drilling holes in slate and granite
Dave Liquorice wrote:
On Thu, 07 Sep 2006 00:06:14 +0100, Frank Erskine wrote: I mean, slate's for roofing, Slate comes in many grades, roofing slate is very soft and splits cleaning and easyly (thats how they make 'em). Some slates are very dense, hard and don't split. We have some 3cm think lumps of Cumbrian Green Slate for the hearth, tough as old boots. and granite for tombstones. And building and worktops, though I can't see why people want granite worktops unless you are a pastry chef. Anything that's survived going through a volcano has a better chance of surviving my wifes treatment of work surfaces. |
#17
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Drilling holes in slate and granite
deano wrote:
I ended buying a diamond crusted bit which worked beautifully... no stressing or straining... no burning or 'glowing' of the bit or material. You have made my day..of all the things that were available, I picked that one to drill quartzite..haven't used it yet tho. |
#18
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Drilling holes in slate and granite
Dave Liquorice wrote:
On Thu, 07 Sep 2006 00:06:14 +0100, Frank Erskine wrote: I mean, slate's for roofing, Slate comes in many grades, roofing slate is very soft and splits cleaning and easyly (thats how they make 'em). Some slates are very dense, hard and don't split. We have some 3cm think lumps of Cumbrian Green Slate for the hearth, tough as old boots. and granite for tombstones. And building and worktops, though I can't see why people want granite worktops unless you are a pastry chef. I have never understood the need for granite or marble pastry surfaces in a kitchen. After all, they will be at ambient room temperature either way. Now if you were to put a marble slab into the fridge before use, I could understand that for rolling out pastry. Dave |
#19
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Drilling holes in slate and granite
The message
from Dave contains these words: I have never understood the need for granite or marble pastry surfaces in a kitchen. After all, they will be at ambient room temperature either way. Which is a lot warmer than my hands. So as I warm the pastry by working with it the slab cools it down - and better than a plastic worktop as it has a higher heat capacity. -- Skipweasel Pay no attention to that man behind the curtain. |
#20
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Drilling holes in slate and granite
On 2006-09-08 00:21:58 +0100, The Natural Philosopher said:
Dave Liquorice wrote: On Thu, 07 Sep 2006 00:06:14 +0100, Frank Erskine wrote: I mean, slate's for roofing, Slate comes in many grades, roofing slate is very soft and splits cleaning and easyly (thats how they make 'em). Some slates are very dense, hard and don't split. We have some 3cm think lumps of Cumbrian Green Slate for the hearth, tough as old boots. and granite for tombstones. And building and worktops, though I can't see why people want granite worktops unless you are a pastry chef. Anything that's survived going through a volcano has a better chance of surviving my wifes treatment of work surfaces. good thing you write under a nom-de-plume :-) |
#21
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Drilling holes in slate and granite
The Natural Philosopher wrote: You have made my day..of all the things that were available, I picked that one to drill quartzite..haven't used it yet tho. A pleasure sir. Doubt is like a pair of lead slippers, which we all occasionally find ourselves wearing. I had them on while tiling my 'undulating" walls. "Stop smoking the weed, get a BIG cup of coffee gird thy loins, get some battens and a straight edge, and get plastering" was your advice to my cry for help. To the point, without being derogatory, it was this challenge that got my arse in gear. I hope I have returned that feeling of confidence in you? As it happens, today, I again used my diamond tile bit with great success and satisfaction. I used porcelain tiles on the floor in my new downstairs shower-room and they are extremely hard. I needed to drill 4 holes in them for securing the toilet pan. After trying a masonry bit first (not even a pinhole did this produce), I turned to my trusty diamond bit and (after holding the bit at 45° to the tile surface, to make diamond contact porcelain, and start the cut) I had 4 perfect holes in about 8 mins. I'm not (knowingly) familiar with quartzite, but if it's anything like porcelain, you'll breeze through it and your newly purchased bit will be lovingly stored in a prized place, within your 'tiling' toolkit. deano. |
#22
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Drilling holes in slate and granite
deano wrote:
The Natural Philosopher wrote: You have made my day..of all the things that were available, I picked that one to drill quartzite..haven't used it yet tho. A pleasure sir. Doubt is like a pair of lead slippers, which we all occasionally find ourselves wearing. I had them on while tiling my 'undulating" walls. "Stop smoking the weed, get a BIG cup of coffee gird thy loins, get some battens and a straight edge, and get plastering" was your advice to my cry for help. To the point, without being derogatory, it was this challenge that got my arse in gear. I hope I have returned that feeling of confidence in you? As it happens, today, I again used my diamond tile bit with great success and satisfaction. I used porcelain tiles on the floor in my new downstairs shower-room and they are extremely hard. I needed to drill 4 holes in them for securing the toilet pan. After trying a masonry bit first (not even a pinhole did this produce), I turned to my trusty diamond bit and (after holding the bit at 45° to the tile surface, to make diamond contact porcelain, and start the cut) I had 4 perfect holes in about 8 mins. I'm not (knowingly) familiar with quartzite, but if it's anything like porcelain, you'll breeze through it and your newly purchased bit will be lovingly stored in a prized place, within your 'tiling' toolkit. deano. Quartzite is somewhat between marble and limestone..in general feel. Nothing like as tough as granite, but more resistant to acid attack then calcium carbonate stones. Apparently its metamorphosed sandstone - i.e. a silicate. Granite is silica alumina and potassium and sodium oxides..all good stable stuff, and all pretty hard. |
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