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OK Partial success..!!

Decided to take a day off from casting and went back to the fundamental idea of drilling granite with sand and copper tube..

After a day of messing around with an electric pillar drill , a De Walt battery hand drill.. a piece of modern 22mm copper tube.. and some ordinary builders sand

I had been trying to drill a piece of polished granite .. so decided to try a piece of rough cut grey granite..
I gave up on the pillar drill because I sensed that one needs to develop a certain amount of skill in terms of pressure, speed and angle..
The battery hand drill allowed me far more control over the drilling.. over time I developed a "feel" for it which is essential..
Getting started was a problem so I managed to chisel a small depression in the granite to act as a pilot. This prevented the tube from skipping all over the place..
I put sand into the depression, started drilling and it just spat the sand out..
so I tried damp sand .. much better.. I could feel it cutting/grinding.
I added more water.. Eventually the wet sand then turned into a kind of "paste" about the consistency of toothpaste.. I had an assistant pushing the sand against the drill with a stick
Now I could really feel it start to cut.. after a few minutes drilling I washed the "sand paste" off to check it out..
There was a shallow ring about 0.5 mm deep..
I mixed more wet sand.. the consistency is critical.. too wet or dry and it won't work.
same again, no real progress until after about one minute , then again the wet sand turned into a paste.. It's really obvious when this happens.. although difficult to describe.. and again I could feel it begin to cut.. so I carried on..
After about another two minutes the sand paste started to turn dark grey.
Obviously granite particles are mixing with the sand.. at this stage I could really feel the drill bit chewing into the granite. which makes sense..
so I carried on all the time my assistant adding water and sand and keeping it piled up around the drill bit..
I kept drilling for five minutes..As the "sand paste" turns darker grey the cutting becomes better..
So after five minutes drilling with sand/granite paste I managed a 5mm cut.

I used ordinary builders sand.. No ruby's or diamond's.. just ordinary sand. MYTH BUSTED!!

Drill speed was variable depending on how it "felt" but I'd say average about 200-300 rpm..

The granite was grey granite..

At the end of the drilling the paste was very dark grey so I'm guessing it consisted mostly of granite particles.

The end of the copper tube was clean and polished.. no sand or granite particles embedded.. So that's another MYTH BUSTED!!..

I think what had happened is that I had, produced by accident , first a sand grinding paste, that eventually became more of a granite grinding paste.. which seemed to work well. the paste consistency is critical and you need to develop a skill and feel for it .. I don't know how much the drill wore down didn't bother to measure..

So there you have it
Granite can be drilled with copper but it is very difficult.. and requires skill and know how.. The secret's in the grinding paste consistency.. Get it wrong and it will not work.

I was very pleased with the result..

Now I have to make it work with a bow drill.. :)



Post Edited (07-Jun-14 20:22)

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The Disappointing Absence of Discoveries of Ancient Technology 838 rako 02-May-14 22:53
Re: The Disappointing Absence of Discoveries of Ancient Technology 295 randompHactor 02-May-14 23:01
Re: The Disappointing Absence of Discoveries of Ancient Technology 259 Lothur 03-May-14 01:01
Re: The Disappointing Absence of Discoveries of Ancient Technology 261 cladking 03-May-14 01:51
Re: The Disappointing Absence of Discoveries of Ancient Technology 307 rako 04-May-14 03:11
Re: The Disappointing Absence of Discoveries of Ancient Technology 254 cladking 04-May-14 04:33
Re: The Disappointing Absence of Discoveries of Ancient Technology 291 WoDoJo 03-May-14 02:58
Re: The Disappointing Absence of Discoveries of Ancient Technology 254 carolb 03-May-14 03:08
Re: The Disappointing Absence of Discoveries of Ancient Technology 272 Chris Jordan 03-May-14 18:28
Re: The Disappointing Absence of Discoveries of Ancient Technology 286 rako 03-May-14 20:03
Re: The Disappointing Absence of Discoveries of Ancient Technology 277 Chris Jordan 04-May-14 07:16
Re: The Disappointing Absence of Discoveries of Ancient Technology 300 rako 04-May-14 16:07
Re: The Disappointing Absence of Discoveries of Ancient Technology 240 Chris Jordan 04-May-14 19:34
Re: The Disappointing Absence of Discoveries of Ancient Technology 332 rako 04-May-14 20:23
Re: The Discoveries of Ancient Technology 260 Chris Jordan 05-May-14 19:55
Re: The Disappointing Absence of Discoveries of Ancient Technology 258 Archae Solenhofen 03-May-14 23:50
Re: The Disappointing Absence of Discoveries of Ancient Technology 296 rako 04-May-14 01:36
Re: The Disappointing Absence of Discoveries of Ancient Technology 293 Archae Solenhofen 04-May-14 07:46
Re: The Disappointing Absence of Discoveries of Ancient Technology 267 AmadeusD 31-May-14 02:37
Re: The Disappointing Absence of Discoveries of Ancient Technology 278 M. Williams 31-May-14 04:13
Re: The Disappointing Absence of Discoveries of Ancient Technology 288 Archae Solenhofen 01-Jun-14 00:50
Re: The Disappointing Absence of Discoveries of Ancient Technology 295 M. Williams 01-Jun-14 01:49
Re: The Disappointing Absence of Discoveries of Ancient Technology 309 magisterchessmutt 04-May-14 06:49
Re: The Disappointing Absence of Discoveries of Ancient Technology 314 Susan Doris 04-May-14 06:51
Re: The Disappointing Absence of Discoveries of Ancient Technology 250 molder 04-May-14 09:22
Re: The Disappointing Absence of Discoveries of Ancient Technology 294 Thanos5150 04-May-14 19:08
Re: The Disappointing Absence of Discoveries of Ancient Technology 303 rako 05-May-14 17:47
Re: The Disappointing Absence of Discoveries of Ancient Technology 293 molder 06-May-14 06:59
Re: The Disappointing Absence of Discoveries of Ancient Technology 317 Tsurugi 29-May-14 03:46
Re: The Disappointing Absence of Discoveries of Ancient Technology 324 gulsbo 04-May-14 21:49
Re: The Disappointing Absence of Discoveries of Ancient Technology 290 Tsurugi 29-May-14 03:21
Re: The Disappointing Absence of Discoveries of Ancient Technology 311 michael seabrook 04-May-14 14:41
Re: The Disappointing Absence of Discoveries of Ancient Technology 277 rako 04-May-14 16:34
Re: The Disappointing Absence of Discoveries of Ancient Technology 273 WoDoJo 04-May-14 17:46
Re: The Disappointing Absence of Discoveries of Ancient Technology 340 rako 04-May-14 18:59
Re: The Disappointing Absence of Discoveries of Ancient Technology 265 Tsurugi 29-May-14 03:55
Re: The Disappointing Absence of Discoveries of Ancient Technology 241 michael seabrook 04-May-14 21:17
Re: The Disappointing Absence of Discoveries of Ancient Technology 320 rako 05-May-14 00:23
Re: The Disappointing Absence of Discoveries of Ancient Technology 354 randompHactor 05-May-14 00:36
A Magic Wand 245 loveritas 05-May-14 00:48
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Re: The Disappointing Absence of Discoveries of Ancient Technology 248 rako 05-May-14 18:32
Re: The Disappointing Absence of Discoveries of Ancient Technology 252 Susan Doris 05-May-14 18:51
Re: The Disappointing Absence of Discoveries of Ancient Technology 256 rako 05-May-14 19:40
Re: The Disappointing Absence of Discoveries of Ancient Technology 306 eyeofhorus33 05-May-14 21:12
Re: The Disappointing Absence of Discoveries of Ancient Technology 259 carolb 05-May-14 21:20
Re: The Disappointing Absence of Discoveries of Ancient Technology 272 eyeofhorus33 05-May-14 22:10
Re: The Disappointing Absence of Discoveries of Ancient Technology 231 carolb 05-May-14 22:43
Re: The Disappointing Absence of Discoveries of Ancient Technology 365 Tsurugi 29-May-14 04:05
Re: The Disappointing Absence of Discoveries of Ancient Technology 290 gulsbo 04-May-14 21:43
Re: The Disappointing Absence of Discoveries of Ancient Technology 307 Susan Doris 04-May-14 22:03
Re: The Disappointing Absence of Discoveries of Ancient Technology 325 Brian Patterson 05-May-14 05:36
Re: The Disappointing Absence of Discoveries of Ancient Technology 263 Susan Doris 05-May-14 06:17
Re: The Disappointing Absence of Discoveries of Ancient Technology 311 gulsbo 05-May-14 20:19
Re: The Disappointing Absence of Discoveries of Ancient Technology 234 Susan Doris 05-May-14 06:25
Re: The Disappointing Absence of Discoveries of Ancient Technology 283 rako 05-May-14 06:43
Re: The Disappointing Absence of Discoveries of Ancient Technology 280 Susan Doris 05-May-14 08:18
Re: The Disappointing Absence of Discoveries of Ancient Technology 281 DPorter 05-May-14 08:56
Re: The Disappointing Absence of Discoveries of Ancient Technology 228 Susan Doris 05-May-14 17:04
Old 3d map 297 michael seabrook 08-May-14 04:05
Re: Old 3d map - more interesting things than a map 348 rako 08-May-14 05:43
Re: The Disappointing Absence of Discoveries of Ancient Technology 293 David L 09-May-14 16:46
Re: Why it's a "Disappointing" Absence 318 rako 09-May-14 16:51
What do you think of the artifact of the rocket or head on this site? 269 rako 14-May-14 03:51
Aincent air ships 276 michael seabrook 14-May-14 11:59
Re: Chris Dunn's site with info and photos of impressive early technology 361 rako 19-May-14 15:55
Re: Chris Dunn's site with info and photos of impressive early technology 254 cladking 19-May-14 19:01
Re: Chris Dunn's site with info and photos of impressive early technology 295 Archae Solenhofen 19-May-14 19:14
Re: Chris Dunn's site with info and photos of impressive early technology 234 caliban 20-May-14 13:59
Re: Chris Dunn's site with info and photos of impressive early technology 267 Archae Solenhofen 20-May-14 16:38
Re: Chris Dunn's site with info and photos of impressive early technology 286 Steve Clayton 26-May-14 00:37
Re: Chris Dunn's site with info and photos of impressive early technology 282 Archae Solenhofen 26-May-14 01:18
Re: Chris Dunn's site with info and photos of impressive early technology 350 Steve Clayton 26-May-14 01:41
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Re: The Disappointing Absence of Discoveries of Ancient Technology 300 Jon Ellison 04-Jun-14 03:50
Re: The Disappointing Absence of Discoveries of Ancient Technology 272 Archae Solenhofen 04-Jun-14 05:47
Re: The Disappointing Absence of Discoveries of Ancient Technology 274 Frank D 04-Jun-14 22:43
Re: The Disappointing Absence of Discoveries of Ancient Technology 273 Archae Solenhofen 04-Jun-14 23:03
Re: The Disappointing Absence of Discoveries of Ancient Technology 242 Frank D 06-Jun-14 22:25
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Re: The Disappointing Absence of Discoveries of Ancient Technology 285 Susan Doris 04-Jun-14 06:20
Re: The Disappointing Absence of Discoveries of Ancient Technology 260 Porta 04-Jun-14 15:24
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Re: The Disappointing Absence of Discoveries of Ancient Technology 234 Archae Solenhofen 04-Jun-14 05:04
Re: The Disappointing Absence of Discoveries of Ancient Technology 235 Porta 04-Jun-14 15:26
Re: The Disappointing Absence of Discoveries of Ancient Technology 280 Archae Solenhofen 04-Jun-14 19:03
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Re: The Disappointing Absence of Discoveries of Ancient Technology 482 Jon Ellison 04-Jun-14 05:27
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Re: The Disappointing Absence of Discoveries of Ancient Technology 253 Porta 04-Jun-14 18:31
Re: The Disappointing Absence of Discoveries of Ancient Technology 300 cladking 04-Jun-14 20:42
Re: The Disappointing Absence of Discoveries of Ancient Technology 310 Dr. Troglodyte 04-Jun-14 21:11
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Mod Note > Jon Ellison - Threaded vs. Flat View 229 Dr. Troglodyte 04-Jun-14 16:25
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Re: The Disappointing Absence of Discoveries of Ancient Technology 316 Jon Ellison 04-Jun-14 21:56
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Re: The Disappointing Absence of Discoveries of Ancient Technology 289 Jon Ellison 04-Jun-14 23:34
Re: The Disappointing Absence of Discoveries of Ancient Technology 322 Jon Ellison 05-Jun-14 00:35
Re: The Disappointing Absence of Discoveries of Ancient Technology 237 Archae Solenhofen 05-Jun-14 01:45
Re: The Disappointing Absence of Discoveries of Ancient Technology 304 Archae Solenhofen 05-Jun-14 00:43
Re: The Disappointing Absence of Discoveries of Ancient Technology 265 Archae Solenhofen 05-Jun-14 00:24
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Re: The Disappointing Absence of Discoveries of Ancient Technology 249 Steve Clayton 05-Jun-14 04:42
Re: The Disappointing Absence of Discoveries of Ancient Technology 337 Jon Ellison 05-Jun-14 10:07
Re: The Disappointing Absence of Discoveries of Ancient Technology 326 Jon Ellison 05-Jun-14 11:25
Re: The Disappointing Absence of Discoveries of Ancient Technology 290 Jon Ellison 05-Jun-14 14:34
Re: The Disappointing Absence of Discoveries of Ancient Technology 332 Jon Ellison 05-Jun-14 18:41
Re: The Disappointing Absence of Discoveries of Ancient Technology 287 Steve Clayton 06-Jun-14 03:29
Re: The Disappointing Absence of Discoveries of Ancient Technology 270 Ratcho 06-Jun-14 06:39
Re: The Disappointing Absence of Discoveries of Ancient Technology 256 Jon Ellison 06-Jun-14 11:27
Re: The Disappointing Absence of Discoveries of Ancient Technology 292 Steve Clayton 07-Jun-14 01:59
Re: The Disappointing Absence of Discoveries of Ancient Technology 297 Jon Ellison 07-Jun-14 11:39
Re: The Disappointing Absence of Discoveries of Ancient Technology 272 Steve Clayton 07-Jun-14 17:11
Re: The Disappointing Absence of Discoveries of Ancient Technology 369 Jon Ellison 07-Jun-14 19:44
Re: The Disappointing Absence of Discoveries of Ancient Technology 295 Steve Clayton 08-Jun-14 03:41
Re: The Disappointing Absence of Discoveries of Ancient Technology 281 DUNE 07-Jun-14 20:54
Re: The Disappointing Absence of Discoveries of Ancient Technology 284 Jon Ellison 07-Jun-14 22:40
Re: The Disappointing Absence of Discoveries of Ancient Technology 244 DUNE 07-Jun-14 23:18
Re: The Disappointing Absence of Discoveries of Ancient Technology 304 Jon Ellison 09-Jun-14 02:56
Re: The Disappointing Absence of Discoveries of Ancient Technology 284 DUNE 09-Jun-14 11:26
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by all means... 279 Ratcho 09-Jun-14 00:52
Re: The Disappointing Absence of Discoveries of Ancient Technology 316 Jon Ellison 07-Jun-14 23:52
Re: The Disappointing Absence of Discoveries of Ancient Technology 278 Steve Clayton 08-Jun-14 04:43
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Re: The Disappointing Absence of Discoveries of Ancient Technology 254 Jon Ellison 08-Jun-14 12:31
Re: The Disappointing Absence of Discoveries of Ancient Technology 272 Jon Ellison 09-Jun-14 12:56
Re: The Disappointing Absence of Discoveries of Ancient Technology 299 DUNE 09-Jun-14 13:14
Re: The Disappointing Absence of Discoveries of Ancient Technology 253 DUNE 09-Jun-14 14:02
Re: The Disappointing Absence of Discoveries of Ancient Technology 275 Jon Ellison 09-Jun-14 16:16
Re: The Disappointing Absence of Discoveries of Ancient Technology 233 Steve Clayton 10-Jun-14 04:21
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Re: The Disappointing Absence of Discoveries of Ancient Technology 344 Jon Ellison 09-Jun-14 16:42
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Re: The Disappointing Absence of Discoveries of Ancient Technology 305 Blu 18-Jul-14 10:44


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