That looks like a really nice piece of work, I like the sawtooth edge setting. About the chest pains, see a doctor, make sure you tell him you work with rocks, grinding shaping, sanding, and that you have not always been diligent in wearing a protective mask, get the chest not x-rayed, but a die contrast CT scan to see if you have anything in the lung tissues. Be safe, not sorry.
I honestly think it's pleurisy or pneumonia. I went to the E.R. as soon as it happened. They took lung x-rays and did the c.t. with contrast,as well as an e.k.g. I'm waiting on an appointment to do a stress test. (Run on a treadmill hooked up to the E.K.G.) My grandfather died at 50 from a heart attack so I'm not taking any chances. Thanks for your advise and concern.