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Centering sanding disks on flat lap?

Hi,

I hope someone has some advice for a problem I'm having with my new flat lap. The sanding disks come as toppers on a flexible backing with an adhesive on the back, separate from the master backing plate. The idea is to peel off a protective sheet from the disk and stick it onto the backing plate. The plates have a 1/2" arbor hole, but there are no arbor holes in the disks. It's not a problem to cut a hole, but how do I center those darn disks on the plates? No matter what I do, the disk winds up off-center on the backing plate, causing it to vibrate terribly when installed and spun at operating speeds. (I'm missing something completely obvious, aren't I?) Any suggestions would be greatly appreciated!

TC

From TC Reg - August 16, 2007 at 11:47:40

Message: 64921

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