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2nd Jul 2019, 08:52 PM #1
Brazed Tungsten Carbide lathe tools
I have a number of Brazed Tungsten Carbide lathe tools that require some dressing to make them serviceable again. When I was in the trade (machinist), many years ago now, we always used Silicone carbide grinding wheels.
I've been contemplating for sometime purchasing as second grinder for use as a dedicated sharpening machine.
But after seeing what is available in the way in Tungsten insert tools and the relativity low prices, I'm beginning to wonder if I should just ditch my old brazed tip tools and replace with Insert tools ????????Hafco AL320G Lathe
Toolex RF31 Mill/Drill
Saber Bandsaw
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2nd Jul 2019, 09:33 PM #2Member: Blue and white apron brigade
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If you want to resurrect these without paying a bomb your could try a diamond lapping wheel like this 6" one I have on the side of my CBN wheel
The diamond wheel cost about ~$10 from Hong Kong and they come in a range of sizes and grits.
As well as TC bits I use mine to sharpen TIG tips.
TP2.jpg
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2nd Jul 2019, 10:01 PM #3
Forgive my ignorance BobL, but what is a CBN wheel ?????
Hafco AL320G Lathe
Toolex RF31 Mill/Drill
Saber Bandsaw
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2nd Jul 2019, 10:20 PM #4Member: Blue and white apron brigade
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3rd Jul 2019, 01:22 AM #5
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3rd Jul 2019, 05:32 AM #6
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3rd Jul 2019, 09:59 AM #7Member: Blue and white apron brigade
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They are quite expensive but don't required dressing and don't wear away like standard abrasive wheels so don't change size. With the base wheel being made of steel heat is readily conducted away from the wheel so grinding is significantly cooler than with regular abrasives.
There was some discussion recently about how quickly they wear (ie wearing faster than expected) but further discussions on the woody forum reveal that when new they are extra aggressive, so once the highs points are worn off the boron nitride crystals, users think the wheel has worn out but the wheel will keep abrading material for a long time after that. Mine is about 5 years and while it is definitely not as aggressive as when it was new it still works fine.
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3rd Jul 2019, 10:25 AM #8Most Valued Member
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Add to Bob's list of advantages that CBN wheels don't fling abrasive dust all over the place.
Chris
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3rd Jul 2019, 12:31 PM #9
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3rd Jul 2019, 12:52 PM #10Member: Blue and white apron brigade
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3rd Jul 2019, 01:15 PM #11
Thanks BobL, I can definitely feel a project coming on, LOL.
Just as side note, what grit do you use ??Hafco AL320G Lathe
Toolex RF31 Mill/Drill
Saber Bandsaw
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3rd Jul 2019, 02:53 PM #12Pink 10EE owner
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8th Jul 2019, 05:26 PM #13
just came across this diamond wheel on Ebay, apart from the grit size would it be a batter option than the disks as mentioned above
https://www.ebay.com.au/i/262394758208?ul_noapp=trueHafco AL320G Lathe
Toolex RF31 Mill/Drill
Saber Bandsaw
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