I have a large quantity of chillies that I would like to make a hot sauce out of. But firstly I would like to create a really fine puree out of these chillies, is anyone aware of the appropriate equipment that will allow me to do this? I don't think a conventional food processor will suffice as it will leave coarse bits of chilli. What are my options?
I assume you will be cooking the sauce. If this is the case, my recommendation is to cook the chillies first and puree them afterwards, as with traditional ljutenica or ajwar. In this case, you can either peel the skin off after charring it and then process the resulting soft flesh whichever way you want (it's very easy, leaves no chunks), or put them unskinned through a meat grinder with a special disk which separates the skins from the pureed flesh.
I'd recommend using a food mill with the fine disc for this, personally.
It will prevent the skin (if sufficiently tough) from making it through to the final result. After that, if it isn't fine enough (although I doubt that), you could always then blitz the result in a blender.
Is there a reason a large capacity food processor couldn't be used? Not sure about the type of chili and if you need the seeds to be removed. Either way, this should work fine, just pulse until finely pureed.