Cbn grinding wheels

[BentonTool]

DIamond is no good for high speed grinding of any steel because the carbon from the diamond is dissolved into the iron in the steel at a temperature of around 150°C so the surface of the diamond is gradually depleted until there's nothing left. A similar chemical reaction happens with CBN (the next hardest thing to diamond) at around 750°C, which isn't normally reached so they last much longer than diamond.

Also bear in mind that CBN wheels should not be used for more than the occasional grinding of high carbon steel tools because the process clogs the wheel so it will require cleaning. Occasional use for HCS is ok because the use for HSS in between will remove the build up of HCS particles.

I use mine for HCS frequently, and have had no issues thus far. See below:

 

[pjwillms]

Thanks very much for that if you don't mind where did you purchase your cbn wheel from .tyvm

 

[kinverkid]

If you have the cash for a CBN wheel go for it. I hear good things about them. I've been turning for many years and just today on two large bowls I have gone to my 25 year old 120 grit white wheel easily ten times just today. In that time my twenty-odd year old Record bowl gouges have lost more steel than the wheel has lost from its diameter. So, for me, I would rather spend the money on tools and timber.

 

[Paul Hannaby]

I use mine for HCS frequently, and have had no issues thus far. See below:

It isn't about the properties of the grinding medium, it's about the application where it is used. Your diamond wheel won't last as long as a CBN wheel if used for grinding steel for this reason. Take a look at this website where they state:

However, diamond wheels are not suitable for grinding ferrous materials, as the carbon in the diamond reacts with iron at high temperatures, causing the diamond to degrade rapidly. For grinding ferrous materials, CBN grinding wheels are the preferred choice.

Unlike diamond, CBN does not react with iron at high temperatures, allowing the wheel to maintain its sharpness and longevity.

For low speed applications or whetstones where heat isn't an issue, diamond is best but we're talking about high speed dry grinders here.

 

[pjwillms]

Thanks very much for the info I will be going for a cbn wheel I tried on the site to build your own wheel not up to that.tyvm