A wobbly grinder and CBN wheel

[Evanism]

Hi all, wisdom needed.

Some time back gave me a grinder to fit a new CBN wheel from CWS.

I've never been happy with the grinder and CBNs performance as there is a very slight wobble on the innermost side that precludes the full use. It makes the

As far as I can tell the CBN is true. I cant guarantee this of course! The wheel uses a 5/8's hole and the diameter of the shaft is also 5/8", or from the micrometer reading just a smidgen smaller.

The wheel when not tightened up has a very small wobble on the shaft. Obviously the shaft has worn over the years and it's not a nice smooth slide-on fit....it's loose.

The question is, is this fixable? Is this something a machine shop could rectify (by say, building and lathing it exact, or lathe and fit a sleeve?) or should I toss the grinder as the cost/repair is uneconomic? (this would be a huge shame as the grinder was a gift and wouldn't feel right.)

Is there some way to bodge up such a very small tolerance gap? (aluminium foil? Some mechanic trick?)

FYI, the CBN cannot be true'd like a regular wheel, so there is no way to dress it, so it must be fixed at the grinder stage.

[Jim Carroll]

Evan I think the cost of any repair would be excessive in comparison to buying a new grinder.

Keep the old one for buffing etc

[Evanism]

Turns out its the wheel itself. It's out of round.

Put it on both left and right side then back the front on both sides and measured it each time with the guage and it's out by 20 to 40 thou on one side of the wheels face.

Makes the tool and CBN ring like a bell as it rotates.

Then tested the shaft and it was out zero. The size difference was accommodated by using a single layer of very thin packing tape on the shaft. It was verrrry thin tape. Worked wonderfully.

[Evanism]

Emailed Jim at CWS and he said to ship it straight up. Champ!

I'll get the 180 at the same time. I just love the idea of the CBN wheels. I see no future for the others other than price.