the rollers on mine are for a 6inch belt there tapered off either side about 3/4 of an inch in either end and just under an 1/8 th taper there is a post on here a guy in america made one .it has photos of mine showing the tapers with a rule agaist them for refrence someone will find themWhich way would you taper the rollers? So its a tad narrower in the centre?
Im looking to build something similar, but have it so I can use as a linisher and also mount it on the end off my mill table and use as a tube notcher