You have a shop, for heavy use this is what you need, uses the same parts as your Dremel is faster and more power. I have been using ONE for years and it gets a workout. You can spend more but like I say, mine is five years old, I think I have gotten my money out of it.
https://www.amazon.com/Astro-218-8-Inch-Pencil-Grinder/dp/B000RH36WU/ref=sr_1_13?ie=UTF8&qid=1512491219&sr=8-13&keywords=pneumatic+die+grinder