I’m in the process of moving my shop to a back room in my garage (thinking this will be easier to heat). The problem is, it’s a raised wooden floor (about 15” to 8” off the ground supported like a deck and the floor itself is plywood). I threw a couple 2x10s under my powermatic 3520 to distribute the weight) I’m still getting enough shake/vibration when running a dried roughed out bowl that Is going to bother me and make me feel like I may get motion sick from the shake.

Any suggestions on reinforcing, strengthening and strengthening the floor without breaking the bank?

Thanks in advance
(I may cross post this on the shop threads)