Just me being me..
Your right of course, both require bands for each cutter,
I was refering to hobs. A hob is basically a rack so the sioze of the gear doesnt
matter, but the epicycloi
dics unless Im wrong cannot be hobbed except as a band similar to the restricti
on of a cutter.
While a proper involute is formed by the hob ( since its just simulatin
g a rack), I dont think a epi curve can be done as a smulated rack, all the hobb for a epi could do is simulate a epi curve for a certain tooth count, so I think a epi hob
would have to be done for a range of tooth count. I have no proof of that, just seemed intuitive as I went through the epi math.