Hi, if it is cylinder type blades you are dong you will need a lathe. That is the way we always did them when I worked in a machine shop. If it is the rotary blade type, I use a bench grinder and then finish with a hand file.

I work in a dealer ship look for a actual blade grinder for power equipment,so you can put the correct angle on it.the replacement wheels are a bit costly but we do aprox 40 blades a day 6 days a week on one.