I think you are going to very quickly realize you need a variety of serious machinery for any sort of volume for retail use. For instance, making dried ground ginger will probably involve slicing and dehydrating the ginger followed by milling it ultra fine. Not something a single grinder will accomplish, and probably not something a blade style grinder can handle. Nutmeg will probably need a powered grater with hardened cutting surfaces to do any volume without significant machine downtime. That isn’t to mention the cleanup needed for some of these. I used an old coffee grinder to grind up cloves and it permanently perfumed the chamber with clove scent because it was partly plastic. That’s it. Clove grinder forever now. You aren’t looking for a single machine here and your investment will be rather steep to accomplish these tasks with any reasonable speed and efficiency. Were it me doing this I’d spend some serious time researching what techniques and machines are used on a small commercial scale for the common difficultly processed spices I was planning to sell. From there I would look into the used restaurant equipment market and figure out my needed budget, space for the machines, power requirements, maintenance requirements etc. Milling spices doesn’t come across as an easily approachable cottage business to me at least. More on reddit.com

I didn’t have any suggestions until you mentioned your budget. Holy shit. The really really popular coffee grinder, the Mahlkonig EK43, was originally a spice grinder, apparently. Mahlkonig is a very reputable German company, and dominate in the high end coffee world. The Ek43 is a commercial grade grinder that I used to own, so I can attest to its power and quality, but a new one is about $3,000 USD. You probably don’t have to get a model that expensive. You could get a used one or a cheaper model from the same company. I would even consider a Bunn G series or Grindmaster for wayyy less money. Cheap home coffee grinders are basically just dull blenders with spinning blades that hack and chop up beans. Quality grinders use burrs to mill and crush beans — a feature you probably want for spices as well. My opinion is that you email Mahlkonig and ask if they have any spice mill attachments for their grinders. And go find a used Mahlkonig grinder for cheaper than $3,000 to put it in. More on reddit.com

Just buy a 30$ electric coffee grinder at a grocery store/hardware store for now and see if that suffices. For us we tore through them every few months and finally spent 200$ on the waring version and it's lasted for years now so it ended up being a win for us instead of replacing a 30$ one every few months when they burn out from overuse in a commercial kitchen. The Waring is a beast. More on reddit.com

How long do you dry the onions? I tried but they stayed kinda pliable even after significant drying. Maybe I had it too cool More on reddit.com