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Post by knave on Jan 10, 2020 20:01:48 GMT -5
$15/stick for diamond brazing rod, 2 sticks needed for each bell.
That’s $90 for a set of homemade cups in 1 grit size.
Ordering some diamond from China to play around with.
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Post by knave on Jan 10, 2020 20:03:06 GMT -5
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Post by knave on Jan 10, 2020 21:31:47 GMT -5
Would you mind sharing how you made your own brazing rod? Sure. Bought 3mm brass tubing. Pinched one end. Filled it with diamonds. Pinched the other end. Braze away, use liberal flux. ETA For larger grit, my next experiment would be to add powdered brass in the space between grit particles. I used a new unused super glue type bottle to fill the tube. The bottle easy to fill. The tip makes a great funnel. Hmmmmmmmmm VERY interesting. Never knew you could use brass tubing for brazing with. |
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NRG
fully equipped rock polisher
Member since February 2018
Posts: 1,688
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Post by NRG on Jan 10, 2020 22:52:03 GMT -5
Sure. Bought 3mm brass tubing. Pinched one end. Filled it with diamonds. Pinched the other end. Braze away, use liberal flux. ETA For larger grit, my next experiment would be to add powdered brass in the space between grit particles. I used a new unused super glue type bottle to fill the tube. The bottle easy to fill. The tip makes a great funnel. Hmmmmmmmmm VERY interesting. Never knew you could use brass tubing for brazing with. There is an expensive patented commercial product that is marketed to sphere makers and others. In the pics it's clear it's just tubing filled with diamond and flux. Not my invention. I just made it work |
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Post by oregon on Jan 13, 2020 12:52:01 GMT -5
Hmmmmmmmmm VERY interesting. Never knew you could use brass tubing for brazing with. There is an expensive patented commercial product that is marketed to sphere makers and others. In the pics it's clear it's just tubing filled with diamond and flux. Not my invention. I just made it work So do you prefer the brazing rod over either ordering diamond segments and brazing those on, or just ordering a set of core drill cups? China prices are tempting... |
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Post by knave on Jan 13, 2020 15:53:55 GMT -5
NRG I believe he’s asking you not me...
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AzRockGeek
has rocks in the head
Member since September 2016
Posts: 704
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Post by AzRockGeek on Jan 13, 2020 19:04:28 GMT -5
I have used core bits, segmented and the brazing rod with bell reducers, I 100% prefer the cups with the brazing rod. If they get glazed over, run the torch over them and they will grind like new. Easy to reapply the diamond when needed.
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Post by knave on Jan 13, 2020 19:06:57 GMT -5
I have used core bits, segmented and the brazing rod with bell reducers, I 100% prefer the cups with the brazing rod. If they get glazed over, run the torch over them and they will grind like new. Easy to reapply the diamond when needed. Sounds like fun. I’m thinking about making a flux/diamond mix to fill the 3mm tubes with. |
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AzRockGeek
has rocks in the head
Member since September 2016
Posts: 704
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Post by AzRockGeek on Jan 13, 2020 19:20:07 GMT -5
I have used core bits, segmented and the brazing rod with bell reducers, I 100% prefer the cups with the brazing rod. If they get glazed over, run the torch over them and they will grind like new. Easy to reapply the diamond when needed. Sounds like fun. I’m thinking about making a flux/diamond mix to fill the 3mm tubes with. Use real coarse diamond 30-50. After the sphere is trued up, switch over to cups that use the diamond pads that they use for the granite counter tops. My diamond pads range from 50-3000, next purchase I will go even higher. |
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Post by oregon on Jan 13, 2020 20:24:40 GMT -5
Sounds like fun. I’m thinking about making a flux/diamond mix to fill the 3mm tubes with. Use real coarse diamond 30-50. So just diamond & flux, no brass filler?... Any idea of what ratio of flux/diamonds?, seems worth the experiment.
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Post by knave on Jan 13, 2020 20:30:43 GMT -5
Use real coarse diamond 30-50. So just diamond & flux, no brass filler... Any idea of what ratio of flux/diamonds?, seems worth the experiment.
Read this. I don’t have experience YET. But I called a place called sphere heaven and they want $15 per stick. Gonna give this a shot. |
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AzRockGeek
has rocks in the head
Member since September 2016
Posts: 704
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Post by AzRockGeek on Jan 13, 2020 21:11:54 GMT -5
I got mine from Sphere Heaven as well. There is definitely some type of filler and flux along with the diamond in the rods. The filler is not brass, it is lightly magnetic.
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NRG
fully equipped rock polisher
Member since February 2018
Posts: 1,688
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Post by NRG on Jan 14, 2020 14:15:45 GMT -5
Yeah $15/stick is a lot Don't get stuck on 3mm tubes. Any small diameter will work. Don't let stuck on fillers until you have experience and wanna play with it. I have brass as filler for the larger diameter tubes. 4-5mm. AzRockGeek Tim is right. Use the largest grit possible. Even 30 grit. Half your diamond is stuck in brass. Mostly I have used commercial segmented cups for roughing balls. |
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Post by knave on Jan 26, 2020 17:18:01 GMT -5
 I don’t know how to read. |
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Post by pauls on Jan 26, 2020 19:34:52 GMT -5
The flux would probably just be borax so easily doable.
Has anyone thought of using diamond drillers core bits. They are reasonably easy to get if you can befriend a diamond driller.
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