Thread: CBN Wheels for... Everything

Luke, I use my CBN's for Carbon, HSS & Tungsten Carbide tooling for both Turning and flat work. Tormek T-7 and an A&A 6" dry grinder.

Carbon tools are used with very light hands. I have placed a magnet under the 80# wheel on the dry grinder and clean the wheels with crepe sanding stick.

My bench and mortice chisels only visit the grinder when new or when the edge is damaged beyond the help of the diamond plates.

Thanks, Pat.

It's good to know that at least one person out there is using CBN wheels with HCS. A lot of what I've read has a very dogmatic approach to NEVER EVER using HCS on CBN. I had a feeling that was over the top.

Cheers,
Luke

Originally Posted by Pat

Luke, I use my CBN's for Carbon, HSS & Tungsten Carbide tooling for both Turning and flat work.

Hummmmm . . . . the reading I've done suggests CBN should not be used on WC. Instead dianond should be used for WC.

Here is my setup
CBN with a cheap (<$20) diamond lapping wheel on the side,
That grinder is a variable speed 3Phase grinder - details here https://www.woodworkforums.com/showth...=188429&page=2
The other wheel on that grinder was a green wheel


I have two of these variable speed grinders and they run (not at the same time) off the same VFD.
The switch at the top of the instrument control tower switches between the two grinders
The gold one has a thin kerf cutting wheel for cutting tool steel and now a green wheel fitted tto the spare spindle.
The green grinder has the CBN and Diamond wheels on one side and a Multi-tool linished on the other.
I am going to move the finisher to the gold one because the finisher pairs better with the thin kerf cutting wheel and VV.



For bugger grinding jobs I have this (also variable speed 10")
Full restoration here https://www.woodworkforums.com/f65/atkins-grinder-193863

Bob,

While your setup is, admittedly, epic... It's far more than I will ever have.

I have a 6", slow speed grinder. I'd like to upgrade it so that I can grind all woodworking and woodturning tools without the mess associated with stone wheels.

What do you suggest?

Originally Posted by Luke Maddux

Bob,

While your setup is, admittedly, epic... It's far more than I will ever have.

I have a 6", slow speed grinder. I'd like to upgrade it so that I can grind all woodworking and woodturning tools without the mess associated with stone wheels.

What do you suggest?

Slow 6" grinder running stone wheels - that's why you have so much grit.
Stone wheels work more efficiently at higher speeds but then you do have to worry more about heat, so fewer passes and more cooling off for carbon steels.

Because Oz uses 50Hz power so our grinders run at ~2850 rpm we're not quite as efficient as 60Hz systems which run at ~3400 rpm.
A 8" 3400 rpm grinder and a white wheel grinds very quickly and leaves less mess.

But if you want minimal mess get 2 CBN wheels one coarse and one fine.
If you have WC tooling add a diamond lapping plate.

What is WC. I presume from the context that it is tungsten carbide

Dave TTC
Turning Wood Into Art

Originally Posted by DaveTTC

What is WC. I presume from the context that it is tungsten carbide

Dave TTC
Turning Wood Into Art

Correct .

Originally Posted by DaveTTC

What is WC. I presume from the context that it is tungsten carbide

Had me stumped with that one too, Dave. Had to hearken back to chemistry class for it to make sense!

The original name for the element we call tungsten was Wolfram, hence the chemical symbol.

I vaguely recall learning (~40-45 years ago?) that, during WWI, the poms not being very keen on the Germanic-sounding name, renamed it, but of course the original symbol stayed.

A bit like how they changed the name of their royal family from Saxe-Gotha-Battenberg to Windsor.

Happy to stand corrected.

Mark

Originally Posted by markkr

The original name for the element we call tungsten was Wolfram, hence the chemical symbol.

I vaguely recall learning (~40-45 years ago?) that, during WWI, the poms not being very keen on the Germanic-sounding name, renamed it, but of course the original symbol stayed.

A bit like how they changed the name of their royal family from Saxe-Gotha-Battenburg to Windsor.

Happy to stand corrected.

Mark

From Wikipedia

The name "tungsten" (from the Swedishtung sten, "heavy stone") is used in English, French, and many other languages as the name of the element, but not in the Nordic countries. Tungsten was the old Swedish name for the mineral scheelite. The other name "wolfram" (or "volfram"), is used in most European (especially Germanic and Slavic) languages, and is derived from the mineral wolframite, which is the origin of its chemical symbol, W.^[8] The name "wolframite" is derived from German "wolf rahm" ("wolf soot" or "wolf cream"), the name given to tungsten by Johan Gottschalk Wallerius in 1747. ^]

A few years ago I was chair of an international chemistry committee that heard a proposal by a Spanish delegate to allow for "Wolfram" to be accepted as an alternative official international name for tungsten especially given that the official international symbol is W. However the bid failed for a variety of reasons. A number of other elements gold for example has only one international official name (gold) and the symbol Au.

There was even an article published about resurrecting the name http://www.iupac.org/publications/ci...4/ud_goya.html

Thanks for the link to the IUPAC reference Bob.

My father was an (organic) industrial research chemist, who gained his doctorate in Munich, so he would have referred to the element as Wolfram. If it is not a case of false memory syndrome, I would have probably seen this in J Chem Ed, which he subscribed to.

Do you know when the first usage of 'Tungsten' was in English? Clearly, if it predated 1914, I'll have to abandon the idea.

Originally Posted by markkr

Thanks for the link to the IUPAC reference Bob.

My father was an (organic) industrial research chemist, who gained his doctorate in Munich, so he would have referred to the element as Wolfram. If it is not a case of false memory syndrome, I would have probably seen this in J Chem Ed, which he subscribed to.

Do you know when the first usage of 'Tungsten' was in English? Clearly, if it predated 1914, I'll have to abandon the idea.

Tungsten and Wolfram were both in use in English not long after the discovery of W in the late 1700's. In time tungsten predominated in English, perhaps spurred on by things like the WWs. In 1919 when internationally accepted names started up both tungsten and wolfram were accepted as alternate official names. Wolfram was only dropped as an alternate official name about 15 years ago when it was deemed that internationally official names must be in English and Wolfram was not being used in english speaking countries. This of course goes not mean that individual countries cannot use wolfram - they can use what they like but for things like international trade and commerce official names must be used.

The whole thing is a bit odd because American and English english names are (e.g. Aluminum and Aluminium) are accepted as official.

Bob, I noticed you don't shield your VFD cables??

Originally Posted by DSEL74

Bob, I noticed you don't shield your VFD cables??

The first machine I put a VFD on was my metal work lathe and I used shielded earthed cables on it and it upsets the AM radio more than all the others so I didn't bother with the rest.