Thread: Bench Grinder wheel balancing

Just get a CBN wheel. It comes balanced, and does not wear.

Regards from Perth

Derek

Originally Posted by derekcohen

Just get a CBN wheel. It comes balanced, and does not wear.

Regards from Perth

Derek

Yes a good point Derek,
But I’m a grinder kind of guy an have two bench grinders.
Only one will have CBN wheels tho

Cheers Matt,

I've always balanced the wheels by drawing a line on the wheel at the nut, then spinning it. Use the line as a mark to turn the wheel on the shaft. Spin again. Stop when the vibration is least.

Regards from Perth

Derek

Originally Posted by derekcohen

Just get a CBN wheel. It comes balanced, and does not wear.

It's interesting that a lot of people think they don't wear but recently I noticed mine is starting to loose its "edge" - It used to take me 2-3 swipes to sharpen HSS bits for the MW lathe but now it takes 4-6.
The guys on the MW forums have also noticed this.

The other type of metal I sharpen fairly often on my CBN wheel is Crobalt specifically as MW lathe tips.
Just As HSS is an iron based alloy, Crobalt is a cobalt based alloy with the remainder being Tungsten and Chromium, their carbides, plus additives. Even though it contains carbides which are vey hard, the overall hardness of Crobalt is some 3 HRC points softer than HSS but it's much tougher than HSS so it's edges do not wear away as fast as HSS. Normally Crobalt bits are sharpened on a 40-60 grit Alox wheel so one would think that they should not impact a CBN wheel. Perhaps they do, but even chaps on the MW forum members who don't use Crobalt are finding their CBN wheels are wearing.

Bob, I suspect the wear on a CBN wheel is similar to that on a diamond stone: the grit is embedded and not perfectly even. Use evens it out. Up until that time, it cuts more aggressively because of the errant bits. once levelled, it settles down to sharpen reliably, but not as aggressively. I have 15 year old DMT diamond stones that I thought were worn, but still cut.

Regards from Perth

Derek

Well this thread seems to be on CBN wheels now [emoji849][emoji849]

Originally Posted by derekcohen

Bob, I suspect the wear on a CBN wheel is similar to that on a diamond stone: the grit is embedded and not perfectly even. Use evens it out. Up until that time, it cuts more aggressively because of the errant bits. once levelled, it settles down to sharpen reliably, but not as aggressively. I have 15 year old DMT diamond stones that I thought were worn, but still cut.

Thats also my experience with diamond wheels so sounds like that could be the case for CBN. I think I may look at getting a coarse one just for shaping.

Personally, I would have mounted the wheel and trued it as the first step. It is obvious from the video that the wheel is slightly eccentric when mounted, and this probably accounted for most of the unbalance. The balance weights may not have been necessary.

Chas.

Originally Posted by Simplicity

Well this thread seems to be on CBN wheels now [emoji849][emoji849]

Its a double barreled thread now by the looks Matt


That's a pretty interesting way of being able to adjust balance.

But balancing works by carefully dressing the wheel as well doesn't it ?

If you use a diamond dresser and hold it so just the high spot touches each pass of the wheel you dress it true don't you ?

Rob

I wonder if based on the quality of the grinding wheel and consistency of the aggregate, the wheel may not be a uniform density, which would mean that being exactly round won't guarantee ballance?

Lance

I suspect that like diamond embedded abrasives CBN will vary in quality depending on the brand, and consequently price. A cheaper CBN wheel may not have the same depth of abrasive as a more expensive wheel and thus wear out faster.

Originally Posted by auscab

Its a double barreled thread now by the looks Matt


That's a pretty interesting way of being able to adjust balance.

But balancing works by carefully dressing the wheel as well doesn't it ?

If you use a diamond dresser and hold it so just the high spot touches each pass of the wheel you dress it true don't you ?

Rob

I guess your right bench grinders have a common shaft too mound two different wheels [emoji849]

I give in [emoji106][emoji106]

I would say if you just dress the front of a wheel yes it is now “true ie perfectly round”
But the sides could still cause an out of balance wheel.

Cheers Matt

Loved the video about the Bugatti!

Originally Posted by Simplicity

Saw this on a YouTube channel I like,
Thought it had some merit.



https://youtu.be/6TA5vf510Vo

Also if you like Bugatti as I do.
Follow there channel it is well worth it.

Cheers Matt.