The naming convention was devised at a time when we were constrained by 8.3 filenames and wee needed four characters to specify the ratio to sufficient precision.
[quote Primitives reference]
tfforrrr.dat (The second and third characters of the filename ff denotes the sweep of torus, as an inverse fraction (01=1/1, 02=1/2, 04=1/4, 08=1/8, 16=1/16, 32=1/32, 48=1/48)).[/quote]
I don't think it is too great an overhead to use t08o6250 + t16o6250 to build a 3/16 torus.
[quote Primitives reference]
tfforrrr.dat (The second and third characters of the filename ff denotes the sweep of torus, as an inverse fraction (01=1/1, 02=1/2, 04=1/4, 08=1/8, 16=1/16, 32=1/32, 48=1/48)).[/quote]
I don't think it is too great an overhead to use t08o6250 + t16o6250 to build a 3/16 torus.
Chris (LDraw Parts Library Admin)