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#26

CreviceSucker
Member
Joined: 24 November 2013
Posts: 729
Member
29 June 2019 12:30 am

Hey guys I have the correct answer for your diamond core drill problems , I have worked with industrial diamonds for donkeys years.

Quartz is not just hard but it’s also very abrasive , it requires soft diamond segment bonds and different diamond concentration (harder segments are used in softer rock like sandstone.)

You need diamonds correctly matched to the quartzite , contact Asahi Industrial Diamonds in Sydney and they will advise you options that will give you the fastest cutting rates and good diamond life .

Just tell them the rock type and they will tell you precisely what you need.

As an example for you , we had diamond segments on saw blades from another supplier that lasted only 100 - 280 lineal metres in black quartzite , Asahi supplied segments that lasted over 2000 metres of life and gave fast cutting speeds. Happy as !

Last edited by CreviceSucker (29 June 2019 12:30 am)

2 users like this post: Ward69, grubstake

#27

thedigger
Member
Joined: 01 January 2014
Posts: 891
Member
29 June 2019 09:46 am

Hi Crevicesucker I have been cutting a lot sandstone for the garden beds,and have felt that 14 inch blade that come with the saw does not cut 100%.
So I will into that a bit more. thumbsup

#28

CreviceSucker
Member
Joined: 24 November 2013
Posts: 729
Member
29 June 2019 10:36 am

grubstake wrote:
Harlequin wrote:

The drill is a Shaw Backpack diamond core drill - petrol powered. I know that quartzite is extremely hard but I expected it to handle the quartzite easily but that was not the case.

Looks like you've got a nice piece of gear there: http://www.backpackdrill.com/

Shaw's Field Experiences page shows their drill even being used successfully in jade boulders, which I thought were hard as the hobs of hell, so your difficulties with quartzite are surprising. What sort of penetration rate are you achieving?

Shaw’s should give the option of different diamond bonds for different materials but I see no mention of it on their website.

If Shaw’s won’t supply it you will find other suppliers in Oz will retip your worn bits .

tell them what RPM the drill runs at as speed is critical , too slow and the diamonds will fracture or will cut like shettt. Ideal surface speed is 24 - 36 metres per second for diamond blades . Not sure what a 41 mm core drill should be , ask Asahi

#29

CreviceSucker
Member
Joined: 24 November 2013
Posts: 729
Member
29 June 2019 10:43 am

thedigger wrote:

Hi Crevicesucker I have been cutting a lot sandstone for the garden beds,and have felt that 14 inch blade that come with the saw does not cut 100%.
So I will into that a bit more. thumbsup

14 inch blades should be dime a dozen , there are some crap ones but also many good diamond products that come out of China because they have been using industrial diamonds for cutting and polishing stone for thousands of years.

Just try spending a little bit more money when you buy one and give them plenty of water . Wet cutting makes the diamonds cut faster , last longer and stops you getting silicosis

1 user likes this post: thedigger

#30

tudogz
Member
From: West Ulverstone, TAS
Joined: 06 August 2019
Posts: 16
Member
08 August 2019 02:19 pm

Great story Harlequin.
I'll come back for more.


"Why do you ask?"

#31

Harlequin
Member
Joined: 26 October 2013
Posts: 33
Member
10 August 2019 01:51 pm

Thanks for the well informed info re diamond cutting.Sorry I haven't replied sooner as I have only just read your post as I have been in the midst of moving house. I will certainly follow your advice.

#32

stoyve
Member
Joined: 01 May 2014
Posts: 1,258
Member
10 August 2019 02:28 pm

This thread is awsome Harlequin,
Keep em coming

Cheers Steve thumbsup

Last edited by stoyve (10 August 2019 02:28 pm)


"Closed mouth gathers no feet"

#33

PaulBlair
Newbie
Joined: 17 November 2019
Posts: 7
Newbie
28 November 2019 05:39 am

Id love to learn a bit from one who's been there and is still doing it.

Last edited by PaulBlair (28 November 2019 05:41 am)

#34

ben2363
Member
Joined: 05 April 2016
Posts: 164
Member
15 April 2020 04:55 pm

Any new updates ??

#35

Digga
Member
From: Melbourne , VIC
Joined: 29 July 2014
Posts: 28
Member
14 May 2020 05:06 am

How is quarts abrasive ? I’ve had 9com Longyear bits down the hole polished to hell , 10 mins to strip it with 9kn on it plus 1000mtrs of rods, once ur bit is sharp you can drill quarts and easy get 6-800 off a bit

#36

Harlequin
Member
Joined: 26 October 2013
Posts: 33
Member
17 September 2020 06:19 pm

I have written permission to prospect for gold over approx 180,000 acres. We are working on one particular property of approx 450,000 acres with a government licence (Exploration Licence) over 27 square kilometres. I woke this morning to discover that a Chinese gold mining company has applied for an Exploration Licence covering almost the entire property plus an enormous area south of us over which we have owner permission. They have not sought permission to enter. The northern boundary of their application comes right up to our EL boundary. Apparently they can do this but if their application is successful they still must get landowner permission to enter (?!)
How did they know about us? They lodged 10 applications in nearby areas on the same day!
Questions, questions.
Harlequin

Last edited by Harlequin (17 September 2020 06:21 pm)

#37

CreviceSucker
Member
Joined: 24 November 2013
Posts: 729
Member
18 September 2020 01:47 am

Harlequin wrote:

I have written permission to prospect for gold over approx 180,000 acres. We are working on one particular property of approx 450,000 acres with a government licence (Exploration Licence) over 27 square kilometres. I woke this morning to discover that a Chinese gold mining company has applied for an Exploration Licence covering almost the entire property plus an enormous area south of us over which we have owner permission. They have not sought permission to enter. The northern boundary of their application comes right up to our EL boundary. Apparently they can do this but if their application is successful they still must get landowner permission to enter (?!)
How did they know about us? They lodged 10 applications in nearby areas on the same day!
Questions, questions.
Harlequin

Did you lodge your EL online ?

How many online departments or processes were there that could have been hacked or where they could read any notification published online ?

ops

#38

CreviceSucker
Member
Joined: 24 November 2013
Posts: 729
Member
18 September 2020 01:58 am

Digga wrote:

How is quarts abrasive ? I’ve had 9com Longyear bits down the hole polished to hell , 10 mins to strip it with 9kn on it plus 1000mtrs of rods, once ur bit is sharp you can drill quarts and easy get 6-800 off a bit

Are you saying your diamond matrix was glazed or polished ?

can you post a photo ?

Look up the Cerchar abrasive index numbers for the quartz you are drilling.

There is data available online for most areas if you look.

Its not just hardness thats a problem for cutting tools , as mentioned above , the abrasiveness is a big factor and it varies massively and the diamond bond should be designed to suit that rock , if you have enough water then i would expect the bond is too hard.

An example for you is a rock saw i designed was getting around 5 years life from wear pads in Sydney sandstone , when it was put onto a job cutting pure quartz reef 600 - 1000 mm thick , the wear plates were smashed within 3 months.

5 years versus 3 months is a service life wear factor of 20 times difference.

Last edited by CreviceSucker (18 September 2020 02:03 am)


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