Hi all,
I have a Porter Cable LN690 router that I am using on my CNC build. I ran across a 7 to 1 ratio timing gear and belt set which I gleaned from some old equipment I have lying around my shop. The thought came to me, to mount the large timing gear in the router chuck, and install a second chuck to be driven by the smaller gear. With a 7 to 1 ratio, using the PC Router (27000 RPM no-load speed), that works out to an incredible 189000 RPM! My question to the group, has anyone ever done something like this? If so, what are your thoughts on designing a shaft and bearing assembly which could withstand such speeds? I realize that it will probably be much lower speeds than the math suggests, (especially once the cutter makes contact with the material being cut), and that quite possibly there are no bearings available which could support such speeds. I just wanted to know if anyone else has ever tried something like this?