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Fivetide
21-11-2016, 06:10 PM
Has anyone come across a supplier of diamond impregnated brazing rods local to Europe ?
I can get them from the US but wondering if anyone knew of a more local reliable supplier?

komatias
21-11-2016, 07:58 PM
Has anyone come across a supplier of diamond impregnated brazing rods local to Europe ?
I can get them from the US but wondering if anyone knew of a more local reliable supplier?

Sounds like you may want to approach people that deal with the oil field or mining. (Cutting and Wear springs to mind) In all my time working with diamond, this is the first I am hearing of impregnated rods, would have thought the brazing temps would cause the diamond to graphatise... learn something every day.

Have you contacted Johnson Matthey? They supplied me with some very rare rods a few years ago.

http://www.matthey.com/about_us/products-technologies/metal-joining

Fivetide
21-11-2016, 09:34 PM
Sounds like you may want to approach people that deal with the oil field or mining. (Cutting and Wear springs to mind) In all my time working with diamond, this is the first I am hearing of impregnated rods, would have thought the brazing temps would cause the diamond to graphatise... learn something every day.

Have you contacted Johnson Matthey? They supplied me with some very rare rods a few years ago.

http://www.matthey.com/about_us/products-technologies/metal-joining

I think they where designed for large concrete / stone cutting tools.
I have had some from here (http://user.xmission.com/~ranthon/lapidary.htm) years ago , well I say I got them , actually a got one from someone who had bought them from the site.
But then I kicked myself because I remembered he had changed to a 2 part diamond epoxy which worked nearly as well at a lot lower cost.
Thanks for the link though :)

JAZZCNC
22-11-2016, 12:14 AM
Can't help but you got me intrigued. . . What you welding.?

Fivetide
22-11-2016, 01:07 AM
Can't help but you got me intrigued. . . What you welding.?

For a try at making some of these :) I have a couple that where in a shed clearance (somewhere).. on eBay. And I PM'd the seller and he said his dad probably got them from the US site. But I have seen people use 2 part epoxy mixed with diamond powder for the size of spheres I'm attempting.


https://youtu.be/zIDLrxa2FTU

I'm intrigued at the method they use for these LINK (http://www.ebay.co.uk/itm/122115-Quality-Diamond-Glass-Ceramic-Porcelain-Hole-Saw-Cutter-Core-Bit-Drill-/282085360813?var=581036545275&_trksid=p2056016.l4276)

19682

komatias
22-11-2016, 09:41 AM
For a try at making some of these :) I have a couple that where in a shed clearance (somewhere).. on eBay. And I PM'd the seller and he said his dad probably got them from the US site. But I have seen people use 2 part epoxy mixed with diamond powder for the size of spheres I'm attempting.


https://youtu.be/zIDLrxa2FTU

I'm intrigued at the method they use for these LINK (http://www.ebay.co.uk/itm/122115-Quality-Diamond-Glass-Ceramic-Porcelain-Hole-Saw-Cutter-Core-Bit-Drill-/282085360813?var=581036545275&_trksid=p2056016.l4276)

19682

My first reaction to the video was..."Like f*** is that diamond impregnated". Cherry red colour on steel is in excess of 700C. Diamond turns to graphite at 600 odd.

Has the chappy found some way of protecting the diamond I wonder? Will look for his patent.

magicniner
22-11-2016, 10:49 AM
This appears to be data from reputable sources -

http://www.colorado.edu/physics/phys4340/phys4340_sp15/hw/JChemPhys36_1903_1962_Diamond.pdf

This suggests that diamond is OK to 800C - which might explain why diamond can be embedded in brass/bronze in a variety of applications and is commercially supplied in brazing rods.

- Nick

cropwell
22-11-2016, 11:08 AM
I have a friend who is a glassblower. He has a couple of lathes with diamond impregnated brass wheels and I often wondered how they were made. So the answer is casting, but with careful temperature control.
Which begs the question - How do you true up a diamond grinding wheel ?:witless:

Rob

magicniner
22-11-2016, 11:23 AM
Which begs the question - How do you true up a diamond grinding wheel ?:witless:


That's an excellent question, I have a diamond impregnated bronze grinding wheel which became a little rough in places after many years service, my solution was to swap it out for it's twin while I tried to find a solution, which I haven't yet found ;-)

- Nick

Fivetide
22-11-2016, 01:01 PM
This appears to be data from reputable sources -

http://www.colorado.edu/physics/phys4340/phys4340_sp15/hw/JChemPhys36_1903_1962_Diamond.pdf

This suggests that diamond is OK to 800C - which might explain why diamond can be embedded in brass/bronze in a variety of applications and is commercially supplied in brazing rods.

- Nick

Theory is fine , but its like trying to fine hens teeth to get rough to polish grades , hence why I'm experimenting with epoxy . But for anything above a 5" sphere I doubt epoxy will be useful.
Never seen an article on truing the wheels but have seen people say if used correct they can last 10-15 years. At 150 a pop for a big one I'd want them to last a bit to lol :)


These guys produce the finished brazed cups in all sorts of grades and sizes

Big scale sphere making.. Highland Park grinding cups (http://www.hplapidary.com/en/diamond-sphere-cups)


https://youtu.be/hY3W9vSfHz0

Lee Roberts
22-11-2016, 09:34 PM
Has anyone come across a supplier of diamond impregnated brazing rods local to Europe ?
I can get them from the US but wondering if anyone knew of a more local reliable supplier?

Fivetide,

We now have a Brazing, Welding & Equipment (http://www.mycncuk.com/forums/314-Brazing-Welding-Equipment) forum thanks to you! congratulation you may move to the front of the class :triumphant:

Fivetide
22-11-2016, 10:28 PM
Fivetide,

We now have a Brazing, Welding & Equipment (http://www.mycncuk.com/forums/314-Brazing-Welding-Equipment) forum thanks to you! congratulation you may move to the front of the class :triumphant:

I am honored to accept such a plaudit ..however without such a rich - varied - skilled and vibrant community none of this would be possible.. and to my Mother who inspired me through those dark times..blah blah..lol

Do I get a plaque over the door ? :)

Thanks Lee

:love_heart::yahoo:

Fivetide
23-11-2016, 11:14 PM
For anyone whos interested or comes across the thread looking for some, they sell them here : SphereHeaven (http://www.sphereheaven.com/equipment.htm)