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Grinders that will take a 8" x 1 1/2" CBN wheel

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Forum topic by Owlcroft posted 05-02-2016 02:21 AM 467 views 0 times favorited 7 replies Add to Favorites Watch
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Owlcroft

34 posts in 2577 days


05-02-2016 02:21 AM

Topic tags/keywords: grinder cbn wheel sharpening question

I have read several articles and forums that recommend using a 1 1/2” wide CBN grinding wheel on a slow or variable speed grinder. General consensus is the 1 1/2” width is far better than a 1” wide wheel. Problem is virtually all 8” grinders I have looked at have 1” wheels. Can I use a 1 1/2” wide CBN wheel on an 8” grinder that comes with a 1” wide wheel? If not where do I find a grinder that will accept a 1 1/2” wheel??

Would appreciate any help and/or advice.

Thanks

-- Owlcroft


7 replies so far

View RobS888's profile

RobS888

1984 posts in 1308 days


#1 posted 05-02-2016 03:07 AM

We just bought two CBN wheels and left off the guards. I was reading in the latest Woodworkers Journal where the lathe expert put washers in between the two gaurd pieces to get more width for the wheels. There are almost no sparks and no grit from the wheels themselves and no chance of the wheels shattering, so there is less need for the guards.

There work really well, and definitely keep the tool cool.

-- I always suspected many gun nuts were afraid of something, just never thought popcorn was on the list.

View Clarkie's profile

Clarkie

380 posts in 1304 days


#2 posted 05-02-2016 03:48 AM

Hello Owlcroft, I purchased two wheels also and bought a new 8” Ryobi bench grinder. They work just as well on a high speed grinder as on a slow. The Ryobi came with the 1 inch wheel and I removed the guards and the new wheels fit fine.

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Owlcroft

34 posts in 2577 days


#3 posted 05-03-2016 09:32 PM

Appreciate the responses. Cleared up a couple things. I will get the delta grinder I was looking at and the CBN wheels and do a review when I have it all put together.

Thanks

-- Owlcroft

View MrRon's profile

MrRon

3926 posts in 2707 days


#4 posted 05-04-2016 04:14 PM

It is important when using CBN wheels on a grinder that the arbor turn with little or no runout. That would restrict you to a higher quality grinder (Baldor for example). Cheap grinders usually have cheap bearings that allow runout. The reason for this is; vitrified or bonded wheels can be dressed with a diamond dresser for zero runout; CBN wheels no. If the grinder has any runout, you will be “skipping” along the wheel instead of “riding” the wheel. A new grinder may show zero runout, but with use, the runout can get worse. How long? Thats anyones guess.

View RobS888's profile

RobS888

1984 posts in 1308 days


#5 posted 05-04-2016 06:53 PM



It is important when using CBN wheels on a grinder that the arbor turn with little or no runout. That would restrict you to a higher quality grinder (Baldor for example). Cheap grinders usually have cheap bearings that allow runout. The reason for this is; vitrified or bonded wheels can be dressed with a diamond dresser for zero runout; CBN wheels no. If the grinder has any runout, you will be “skipping” along the wheel instead of “riding” the wheel. A new grinder may show zero runout, but with use, the runout can get worse. How long? Thats anyones guess.

- MrRon


We had some run-out, so we ordered the elliptical washers. They work well. It looks funny when it is slowing down.

-- I always suspected many gun nuts were afraid of something, just never thought popcorn was on the list.

View Wildwood's profile

Wildwood

1882 posts in 1598 days


#6 posted 05-04-2016 08:29 PM

Dave sells bushings to fit most 8” grinders! If you buy a grinder that does not have 2 ¼” shaft as shown in the video. Think someone said 8” Rikon shafts little short. Could always e-mail Dave and see if there is work around for shorter grinder shafts.

http://d-waytools.com/cbn-grinding-wheels/bushing-kits-for-cbn-grinding-wheels/

https://www.youtube.com/watch?v=Bk14XNP7ixM

Another vendor” not sure if shaft lenght important or not.

http://woodturnerswonders.com/collections/radius-edge-cbn-wheels/products/cbn-wheel-pair-80-and-180-grit

CBN wheels excel at sharpening HSS without needing to clean the wheel but if sharpening carbon steel tools will new to soak wheels in kerosene and wire brush them.

Would pay attention to shaft size & bushings & washers! Whether need 1” or 1 1/2” totally up to you!

-- Bill

View jgt1942's profile

jgt1942

137 posts in 1352 days


#7 posted 05-04-2016 08:32 PM



We just bought two CBN wheels and left off the guards. I was reading in the latest Woodworkers Journal where the lathe expert put washers in between the two gaurd pieces to get more width for the wheels. There are almost no sparks and no grit from the wheels themselves and no chance of the wheels shattering, so there is less need for the guards.

There work really well, and definitely keep the tool cool.

- RobS888

I did the same with my 8” Ryobi bench grinder. The guards are really for the stone wheels and to prevent injury if the stone wheel breaks. Also the stone wheels generate a LOT of sparks and the CBN wheels will generate very little sparks.

Use the elliptical washers washers to help with the run-out. After you mount the wheel.
1) Use a felt pen, mark a spot on the wheel and the shaft. This will be used as a reference point.
2) Turn on the grinder and check for run-out, if you have run-out, turn off the grinder, loosen and slightly rotate the wheel, tighten and check again.
3) Continue this procedure until you eliminate the run-out

-- JohnT

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