I recently got an Omga radial arm saw and have been going over it.
The main question is regarding the motor: how undersized or worn can a motor spindle be before it causes issues spinning a blade? It is 1" spindle, spins a 12" blade, and uses a keyway due to having a mechanical brake. Omga tech tells me a new motor spindle measures .999" with digital calipers. My spindle measures around .992-.995" (.005-.008" under). For comparison, the 5/8" arbor on my Sawstop measures .6235" (.015" under) and the 5/8" to 1" arbor adapter on my Makita miter saw reads .9985" (also .015" under). There's noticeable more slop with a blade on the Omga than with a blade on the miter saw or table saw. But is it enough to worry about? I don't see the slop introducing blade wobble, with the massive blade washers there. I'll be using the radial arm saw for general crosscutting and I do want it to cut well. A new motor is $1300.
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