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?