Cbn grinding wheels

[pjwillms]

I am looking to purchase a cbn grinding wheel 150mm x40x1/2 inch spindle are the cheaper ones any good and where is the best place two purchase them tyvm

 

[Stigmorgan]

Have you tried Axminster or Yandles?

 

[pjwillms]

I was in Axminster in Cardiff today that was £200 pounds ther you get what you pay for good quality ther.ty

 

[Robbo3]

I am looking to purchase a cbn grinding wheel 150mm x40x1/2 inch spindle are the cheaper ones any good and where is the best place two purchase them tyvm

Dunno, but the gent who gave a demo at West Oxfordshire Woodturners this week told us that a member of the club he attends has bought a cheap one from a Chinese seller & all the members are awaiting his feedback.

 

[Blister]

I think Simon Hope does them as well.

 

[pjwillms]

Thanks

 

[John Brown]

Dunno, but the gent who gave a demo at West Oxfordshire Woodturners this week told us that a member of the club he attends has bought a cheap one from a Chinese seller & all the members are awaiting his feedback.

I bought a cheap one from AliExpress, and it turns out that it's a diamond wheel, no CBN.

 

[pjwillms]

Thanks for if you don't mind how much was it ty

 

[John Brown]

Thanks for if you don't mind how much was it ty

I can't remember exactly - around the £30 mark, I think, but as I said, it's not CBN. AliExpress seem to use the terms CBN and diamond interchangeably.

 

[pjwillms]

So no good tyvm

 

[John Brown]

So no good tyvm

No good for HSS, apparently. I'm putting mine in a drawer for 26 years, and then giving it to the wife on our wedding anniversary.

 

[RobNichols]

I think Simon Hope does them as well.

I'd suggest Hope too.

 

[pjwillms]

Thanks for that

 

[Katomi woodsmith]

I am still using a white wheel that was bought in 1992. I think I will take a look at CBN and dimond as I plan to move to HSS tools
My 1990’s maples are nice to use, takes a reg sharpen when turning hard woods

 

[pjwillms]

Can you get a finer grit in the white wheel

 

[RobNichols]

Two significant advantages of CBN stem from the wheel being metal which means it tends to conduct the heat away so the blade doesn't get as hot as they would with a ceramic wheel, and also they are not prone to break. This means they are less likely to over heat the blade and they are less dangerous to use.

 

[pjwillms]

Thanks very much for that advice I will be purchasing one of cbn wheels wood 180 grit be ok.ty

 

[Katomi woodsmith]

Pj I have just looked at amazom they do 120 grit 40 grit 100 grit and a 60 grit

 

[Paul Hannaby]

No good for HSS, apparently. I'm putting mine in a drawer for 26 years, and then giving it to the wife on our wedding anniversary.

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.

 

[pjwillms]

Thanks for that