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Good afternoon Filippo;

Haven't been around much lately because I've been too busy in the shop. One way I personally would use to true the disc is as follows.
(Disclaimer: I'm not familiar with the Rikon, and years ago I used to be a machinist.)

If the Rikon has a good to moderately stable platform mounted in front of the disc, and it has a miter slot, I personally would use a tool bit from a metal lathe, and make a jig to turn the face of the disc while running the unit. Keep in mind that you must take very light cuts and design the jig with the cutting tool aligned perfectly centered on the disc. Common sense (and you would already know this) is to cut from the outer edge of the down-stroke side of the disc, toward the center. Light passes are extremely important especially if the miter slot is not of the t-slot variety. You don't want your tool to come flying out of the track causing injury to yourself or the disc. If done with care, and safety in mind, this is a very good and effective method, and a surefire way to get the disc perfectly true. One potential problem, if the disc is really badly out of true, is the possibility of the disc being badly out of balance after truing the face. If this happens, and there is room on the back side of the disc, the stick on wheel weights (i.e. the ones used to balance mag wheels) can resolve this problem. Too much vibration can destroy your machine over time. There may be a simpler way to do this, but this is my preferred method. You're quite an intelligent fellow so you may even be able to improve on my method.

Later. Gotta go put another coat on a couple of guitars in the finishing room.

_________________
Bill Hodge


One does not simply, own enough guitars!

I don't know the specs of the Rikon, presuming you are talking 6" or so, but my advice would be to buy a dedicated 12" disc sander with cast iron disc and table and use it with hook and loop paper.
The larger size really is worth it and the larger solid stable table can be set up to give you confidence in getting the right angle of cut.

Not sure about the rikon , Some of the disc are simply mounted to a shaft with a set screw , maybe a allen key . I would take it off and make sure the disc is seated properly and has no " Slop" in the shaft hole . Reseat it and tighten everything down and then if necess, go to the suggested steps .

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