hi

made the mandrel for heat treating piston rings and found that gap dowel diameter wrong or mandrel diameter incorrect

?

rings are made to spec ie .875 x .799 x .038, but when fitting into mandrel the dowel spreads ring diameter too large for the

mandrel dia of .827 as stated on sheet 50 of the construction notes. have some purchased rings of .875 and they have a dowel gap

of .131 as per jerrys specs

if i use .875 x 3.1416 = 2.7489 + .131 = 2.8799 devided by 3.1416 = .9166 OD and same again for ID i get .8406 this is .013 larger

than the .827 jerry quotes. will try using the .840 ID. can any one enlighten me if am correct or on the wrong path

mic