It's not easy but can be done.
When mounting the wheel, make sure the wheel you put on is as round as possible, you can dial in the wheel, but first, put a layer of tape over the outside, so the dial indicator stem doesn't get scratched up. If the wheel is still out, I usually dress with a Industrial diamond, mounted on a block of steel, the base holds a key, where it slides in a key-way on the tool rest of your grinder.
The diamond I have mounted in a screw [fine pitch] so you can turn and advance when dressing.

These Star type dresser as you mention, don't work very good, they have to be large and heavy, this makes them less vibrating and jumping when grinding high spots on wheel.
You can try this with yours, .. by holding with one hand a heavy piece of steel bar or plate on the end of handle while dressing, [do not push hard, otherwise you follow the uneven pattern of the wheel] to make it less bouncing back and force.
Good luck.
Konrad

Spam,

You need to get a dressing stick. It's just a super hard, abrasive material that will get that wheel back into shape and balance, quickly. I use mine all the time on my Dremel grinding tips. It's amazing how that tool will be growling, vibrating and struggling to turn with an out of balance tip, and just smooth out beautifully when it gets trued up.

GG

Here is a link that might be useful: Dressing stick

These dressing sticks do not work very well for heavy 8" Grindingwheels...it will only follow the extcentricity of the wheel.....not heavy enough.
They work OK for small and light wheels.

Konrad

Thanks, Konrad and GG.

Before I saw your replies tonight, I took another stab at quieting down the HF beast.

Basically, I adjusted each wheel so that it had the minimal amount of runout. There's enough play in the center holes to do this. Then I adjusted the orientation of one wheel to the other to minimize static turning (weight balance).

OK, I know that it would be best to have the wheels weight balanced and concentric, but... this works well enough for now. The grinder is much quieter at speed than before. It does go through a fair amount of shaking at half rpm's, more on spinning down (takes longer) than spinning up.

I am considering replacing one or both wheels with higher quality numbers. But for now, this works ok.

I did first try truing the wheel with a small diamond dresser I use for my tool grinder... but this didn't seem to work all that well.

I hadn't thought of sloppy fit on the arbor. Every wheel I've ever mounted on my grinder had no play. Large wheels will cause major problems with vibration if they are off center. Running a grinder with wheels that are out of balance, create vibration that will destroy the bearings if it is bad enough, as well as making the machine work harder just to spin the wheels. You'll really see how much it loads the machine when you turn it off. Out of balance wheels will cause the grinder to stop faster, while wheels with good balance will take much longer to slow to a stop. Compare that to what I said about my Dremel bits being out of round. And they are less than an inch in diameter.

I think you would do better to toss the wheels and get a good brand like 3M/Norton or similar.

GG