I am absolutely excited for the shop development I made this week. I found a 3hp Baldor three phase motor on craigslist for $40. It came with 25' of cord, a wired switch and a pulley installed on the shaft. Negotiated lower than that
I picked up a $95 VFD on amazon capable of driving a three phase 3hp motor and it came in 48hrs.
I was running a 2Hp motor wired to 110 and getting less than 1.5hp out of it. This thing is beastly in comparison and runs silent.
I was able to decipher the instructions and get things up and running pretty quick! It has a 6' remote for the controls. I am going to try to extend that to 15 ft so I can actually mount the VFD outside my shop on the other side of the wall and avoid enclosing it altogether.
Since my motor came with a pulley and all wiring I needed, the grand total cost out of pocket for me to swap to VFD was ~$125.
Right now I'm running it off pulleys as my machine was already using them. I have found a coupling that will allow me to direct drive it but I'm a bit puzzled how I would align the shafts with the new motor shaft being higher than my KMG that is mounted directly on my bench. I dont really feel like shimming the entire machine and its base up to the motor height but I dont see another way.
If i stay with a pulley setup and fix it, I can do so at a ratio that gives me the top end belt speed I may want. If I direct drive it, I'll want to get a new drive wheel at some point up up my belt speed but I do small blades 99% of the time now and dont do too much at blazing belt speeds.
I dont have a formal motor mount for this but may order one as it seems the only great way of getting good belt tension. If, alternatively, I can figure out a super simple way to align the motor spindle to the grinder drive shaft, I'll go that route.