What is the easiest way to grind poppy seeds? When I prepare a poppy seeds filling (e.g. for a pie), I currently use an old-style coffee grinder. It takes small amounts (like 2 tbsp at a time) of poppy seeds and grinds them into powder in 2-3 minutes. The resulting quality is OK for me, but the process is not very easy as I often need to stop for the grinder to cool down, to move around the seeds that got stuck to the inner walls, and it takes quite some time when you need to process 200-300 g of poppy seeds that way.

So, my question is: Is there any kitchen appliance or just some other way to grind poppy seeds easier without losing on the quality?
You need to acquire a poppy seed grinder (picture #1). It's still not easy to grind a lot of poppy seed — you will need to break out your supply of elbow grease — but it's much more efficient than a coffee grinder. It also does a better job, because it actually crushes the seeds to release all their oils and other goodness, rather than haphazardly cutting apart some of the seeds and not others. (They do make electric grinders [picture #2], but they're aimed at bakeries and the like, not for home use.)

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If you're stuck using what you have, namely the coffee grinder, try adding sugar. It helps keep the poppy seed from sticking everywhere you don't want it to. Naturally, you then need to take the sugar quantity into account when you're actually using the poppy seed.